2001 NISSAN X-TRAIL engine control

EC-16
On Board Diagnosis Logic ...................................1275
DTC Confirmation Procedure ..............................1276
Wiring Diagram ....................................................1277
Diagnostic Procedure ..........................................1278
Component Inspection .........................................1280
DTC P1123 THROTTLE CONTROL MOTOR RELAY 1281
Component Description .......................................1281
CONSULT-II Reference Value in Data Monitor Mode
1281
ECM Terminals and Reference Value ..................1281
On Board Diagnosis Logic ...................................1281
DTC Confirmation Procedure ..............................1281
Wiring Diagram ....................................................1283
Diagnostic Procedure ..........................................1284
Component Inspection .........................................1285
DTC P1212 ESP/TCS/ABS COMMUNICATION
LINE ........................................................................1286
Description ...........................................................1286
On Board Diagnosis Logic ...................................1286
DTC Confirmation Procedure ..............................1286
Diagnostic Procedure ..........................................1286
DTC P1217 ENGINE OVER TEMPERATURE .......1287
System Description ..............................................1287
CONSULT-II Reference Value in Data Monitor Mode
1287
ECM Terminals and Reference Value ..................1288
On Board Diagnosis Logic ...................................1288
Overall Function Check .......................................1289
Wiring Diagram ....................................................1291
Diagnostic Procedure ..........................................1292
Main 12 Causes of Overheating ..........................1299
Component Inspection .........................................1300
DTC P1805 BRAKE SWITCH ................................1301
Description ...........................................................1301
CONSULT-II Reference Value in Data Monitor Mode
1301
ECM Terminals and Reference Value ..................1301
On Board Diagnosis Logic ...................................1301
FAIL-SAFE MODE ...............................................1301
DTC Confirmation Procedure ..............................1301
Wiring Diagram ....................................................1303
Diagnostic Procedure ..........................................1304
Component Inspection .........................................1305
HO2S1 HEATER ....................................................1307
Description ...........................................................1307
CONSULT-II Reference Value in Data Monitor Mode
1307
ECM Terminals and Reference Value ..................1307
Wiring Diagram ....................................................1308
Diagnostic Procedure ..........................................1309
Component Inspection .........................................1311
Removal and Installation .....................................1311
HO2S2 HEATER ....................................................1312
Description ...........................................................1312
CONSULT-II Reference Value in Data Monitor Mode
1312
ECM Terminals and Reference Value ..................1312
Wiring Diagram ....................................................1313
Diagnostic Procedure ..........................................1314Component Inspection .........................................1315
Removal and Installation ......................................1315
IAT SENSOR ..........................................................1316
Component Description .......................................1316
Wiring Diagram ....................................................1317
Diagnostic Procedure ........................................... 1318
Component Inspection .........................................1319
Removal and Installation ......................................1319
HO2S1 ....................................................................1320
Component Description .......................................1320
CONSULT-II Reference Value in Data Monitor Mode
1320
ECM Terminals and Reference Value ..................1320
Wiring Diagram ....................................................1321
Diagnostic Procedure ........................................... 1322
Component Inspection .........................................1323
Removal and Installation ......................................1325
HO2S2 ....................................................................1326
Component Description .......................................1326
CONSULT-II Reference Value in Data Monitor Mode
1326
ECM Terminals and Reference Value ..................1326
Wiring Diagram ....................................................1327
Diagnostic Procedure ........................................... 1328
Component Inspection .........................................1329
Removal and Installation ......................................1330
IGNITION SIGNAL .................................................1331
Component Description .......................................1331
ECM Terminals and Reference Value ..................1331
Wiring Diagram ....................................................1332
Diagnostic Procedure ........................................... 1334
Component Inspection .........................................1338
Removal and Installation ......................................1339
EVAP CANISTER PURGE VOLUME CONTROL
SOLENOID VALVE ................................................. 1340
Description ...........................................................1340
CONSULT-II Reference Value in Data Monitor Mode
1340
ECM Terminals and Reference Value ..................1340
Wiring Diagram ....................................................1342
Diagnostic Procedure ........................................... 1343
Component Inspection .........................................1346
Removal and Installation ......................................1346
IVT CONTROL SOLENOID VALVE .......................1347
Description ...........................................................1347
CONSULT-II Reference Value in Data Monitor Mode
1347
ECM Terminals and Reference Value ..................1348
Wiring Diagram ....................................................1349
Diagnostic Procedure ........................................... 1350
Component Inspection .........................................1352
Removal and Installation ......................................1352
PNP SWITCH .........................................................1353
Component Description .......................................1353
CONSULT-II Reference Value in Data Monitor Mode
1353
ECM Terminals and Reference Value ..................1353
Wiring Diagram ....................................................1354
Diagnostic Procedure ........................................... 1355

EC-17
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ECA INJECTOR CIRCUIT ..............................................1357
Component Description .......................................1357
CONSULT-II Reference Value in Data Monitor Mode
1357
ECM Terminals and Reference Value .................1357
Wiring Diagram ...................................................1358
Diagnostic Procedure ..........................................1359
Component Inspection ........................................1361
Removal and Installation .....................................1361
START SIGNAL .....................................................1362
CONSULT-II Reference Value in Data Monitor Mode
1362
ECM Terminals and Reference Value .................1362
Wiring Diagram ...................................................1363
Diagnostic Procedure ..........................................1364
FUEL PUMP CIRCUIT ...........................................1366
Description ..........................................................1366
CONSULT-II Reference Value in Data Monitor Mode
1366
ECM Terminals and Reference Value .................1366
Wiring Diagram ...................................................1368
Diagnostic Procedure ..........................................1369
Component Inspection ........................................1371
Removal and Installation .....................................1372
REFRIGERANT PRESSURE SENSOR ................1373
Component Description .......................................1373
ECM Terminals and Reference Value .................1373
Wiring Diagram ...................................................1374
Diagnostic Procedure ..........................................1375
Removal and Installation .....................................1376
ELECTRICAL LOAD SIGNAL ...............................1377
CONSULT-II Reference Value in Data Monitor Mode
1377
ECM Terminals and Reference Value .................1377
Wiring Diagram ...................................................1378
Diagnostic Procedure ..........................................1380
DATA LINK CONNECTOR ....................................1385
Wiring Diagram ...................................................1385
EVAPORATIVE EMISSION SYSTEM ....................1386
Description ..........................................................1386
Component Inspection ........................................1388
POSITIVE CRANKCASE VENTILATION ..............1389
Description ..........................................................1389
Component Inspection ........................................1389
SERVICE DATA AND SPECIFICATIONS (SDS) ...1391
Fuel Pressure ......................................................1391
Idle Speed and Ignition Timing ............................1391
Calculated Load Value ........................................1391
Mass Air Flow Sensor .........................................1391
Intake Air Temperature Sensor ...........................1391
Engine Coolant Temperature Sensor ..................1391
Heated Oxygen Sensor 1 Heater ........................1391
Heated Oxygen sensor 2 Heater .........................1391
Crankshaft Position Sensor (POS) ......................1391
Camshaft Position Sensor (PHASE) ...................1391
Throttle Control Motor ......................................... 1392
Injector ................................................................1392
Fuel Pump ...........................................................1392
YD
INDEX FOR DTC ....................................................1393
Alphabetical Index ...............................................1393
DTC No. Index .....................................................1393
PRECAUTIONS .....................................................1395
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ..............................................................1395
Precautions ..........................................................1395
Wiring Diagrams and Trouble Diagnosis .............1397
ENGINE CONTROL SYSTEM ...............................1398
System Diagram ..................................................1398
System Chart .......................................................1399
Fuel Injection Control System ..............................1399
Fuel Injection Timing Control System ..................1401
Air Conditioning Cut Control ................................1401
F u e l C u t C o n t r o l ( A t N o L o a d & H i g h E n g i n e S p e e d ) 1401
Crankcase Ventilation System .............................1402
CAN Communication ...........................................1402
BASIC SERVICE PROCEDURE ............................1404
Fuel Filter .............................................................1404
Accelerator Pedal Released Position Learning ...1404
Fuel Pressure Relief Valve ..................................1405
ON BOARD DIAGNOSTIC (OBD) SYSTEM .........1406
DTC and MI Detection Logic ...............................1406
Diagnostic Trouble Code (DTC) ..........................1406
NATS (Nissan Anti-theft System) ........................1406
Malfunction Indicator (MI) ....................................1407
TROUBLE DIAGNOSIS .........................................1409
Trouble Diagnosis Introduction ............................1409
Basic Inspection ..................................................1412
Symptom Matrix Chart .........................................1416
Engine Control Component Parts Location .........1420
Circuit Diagram ....................................................1423
ECM Harness Connector Terminal Layout ..........1425
ECM Terminals And Reference Value .................1425
CONSULT-II Function ..........................................1431
CONSULT-II Reference Value in Data Monitor Mode
1437
Major Sensor Reference Graph in Data Monitor
Mode ....................................................................1440
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT ......................................................................1441
Description ...........................................................1441
Diagnostic Procedure ..........................................1441
POWER SUPPLY CIRCUIT FOR ECM ..................1442
ECM Terminals and Reference Value ..................1442
Wiring Diagram ....................................................1443
Diagnostic Procedure ..........................................1444
Component Inspection .........................................1447
DTC U1000 CAN COMMUNICATION LINE ...........1448
Description ...........................................................1448
On Board Diagnosis Logic ...................................1448
DTC Confirmation Procedure ..............................1448
Wiring Diagram ....................................................1449
Diagnostic Procedure ..........................................1450
DTC P0100 MASS AIR FLOW SENSOR (MAFS) .1451
Component Description .......................................1451

EC-18
CONSULT-II Reference Value in Data Monitor Mode
1451
ECM Terminals and Reference Value ..................1451
On Board Diagnosis Logic ...................................1452
DTC Confirmation Procedure ..............................1452
Wiring Diagram ....................................................1453
Diagnostic Procedure ..........................................1454
Component Inspection .........................................1455
Removal and Installation .....................................1455
DTC P0115 ENGINE COOLANT TEMPERATURE
(ECT) SENSOR (CIRCUIT) ....................................1456
Description ...........................................................1456
On Board Diagnosis Logic ...................................1456
DTC Confirmation Procedure ..............................1456
Wiring Diagram ....................................................1457
Diagnostic Procedure ..........................................1458
Component Inspection .........................................1459
Removal and Installation .....................................1459
DTC P0120 ACCELERATOR PEDAL POSITION
SENSOR .................................................................1460
Description ...........................................................1460
CONSULT-II Reference Value in Data Monitor Mode
1460
ECM Terminals and Reference Value ..................1460
On Board Diagnosis Logic ...................................1461
DTC Confirmation Procedure ..............................1461
Wiring Diagram ....................................................1462
Diagnostic Procedure ..........................................1463
Component Inspection .........................................1466
Removal and Installation .....................................1467
DTC P0190 COMMON RAIL FUEL PRESSURE
SENSOR .................................................................1468
Description ...........................................................1468
CONSULT-II Reference Value in Data Monitor Mode
1468
ECM Terminals and Reference Value ..................1468
On Board Diagnosis Logic ...................................1468
DTC Confirmation Procedure ..............................1468
Wiring Diagram ....................................................1469
Diagnostic Procedure ..........................................1470
Component Inspection .........................................1471
Removal and Installation .....................................1471
DTC P0201 - P0204 FUEL INJECTOR ..................1472
Description ...........................................................1472
CONSULT-II Reference Value in Data Monitor Mode
1472
ECM Terminals and Reference Value ..................1472
On Board Diagnosis Logic ...................................1473
DTC Confirmation Procedure ..............................1474
Wiring Diagram ....................................................1475
Diagnostic Procedure ..........................................1477
Component Inspection .........................................
1478
Removal and Installation .....................................1478
DTC P0335 CRANKSHAFT POSISTION SENSOR
(TDC) ......................................................................1479
Description ...........................................................1479
CONSULT-II Reference Value in Data Monitor Mode
1479
ECM Terminals and Reference Value ..................1479On Board Diagnosis Logic ...................................1480
DTC Confirmation Procedure ...............................1480
Wiring Diagram ....................................................1481
Diagnostic Procedure ........................................... 1482
Component Inspection .........................................1482
Removal and Installation ......................................1483
DTC P0340 CAMSHAFT POSITION SENSOR ......1484
Description ...........................................................1484
ECM Terminals and Reference Value ..................1484
On Board Diagnosis Logic ...................................1484
DTC Confirmation Procedure ...............................1484
Wiring Diagram ....................................................1486
Diagnostic Procedure ........................................... 1487
Component Inspection .........................................1487
Removal and Installation ......................................1488
DTC P0500 VEHICLE SPEED SENSOR (VSS) .....1489
Description ...........................................................1489
ECM Terminals and Reference Value ..................1489
On Board Diagnosis Logic ...................................1489
Overall Function Check ........................................1489
Wiring Diagram ....................................................1490
Diagnostic Procedure ........................................... 1492
DTC P1107 ABSOLUTE PRESSURE SENSOR ....1494
Description ...........................................................1494
On Board Diagnosis Logic ...................................1494
DTC Confirmation Procedure ...............................1494
Diagnostic Procedure ........................................... 1494
DTC P1180 FUEL TEMPERATURE SENSOR .......1496
Description ...........................................................1496
CONSULT-II Reference Value in Data Monitor Mode
1496
ECM Terminals and Reference Value ..................1496
On Board Diagnosis Logic ...................................1496
DTC Confirmation Procedure ...............................1496
Wiring Diagram ....................................................1497
Diagnostic Procedure ........................................... 1498
Removal and Installation ......................................1498
DTC P1211 TCS CONTROL UNIT .........................1499
Description ...................................................
........1499
On Board Diagnosis Logic ...................................1499
DTC Confirmation Procedure ...............................1499
Diagnostic Procedure ........................................... 1499
DTC P1212 TCS COMMUNICATION LINE ............1500
Description ...........................................................1500
On Board Diagnosis Logic ...................................1500
DTC Confirmation Procedure ...............................1500
Diagnostic Procedure ........................................... 1500
DTC P1216 EDU .....................................................1501
Description ...........................................................1501
ECM Terminals and Reference Value ..................1501
On Board Diagnosis Logic ...................................1502
DTC Confirmation Procedure ...............................1502
Wiring Diagram ....................................................1503
Diagnostic Procedure ........................................... 1505
Removal and Installation ......................................1507
DTC P1217 OVERHEAT (COOLING SYSTEM) .....1508
Description ...........................................................1508
CONSULT-II Reference Value in Data Monitor Mode
1508

EC-19
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ECA ECM Terminals and Reference Value .................1508
On Board Diagnosis Logic ..................................1508
Overall Function Check .......................................1509
Wiring Diagram ...................................................1510
Diagnostic Procedure ..........................................1511
Main 12 Causes of Overheating ..........................1517
Component Inspection ........................................1518
DTC P1233 - P1234 SUCTION CONTROL VALVE 1519
Description ..........................................................1519
CONSULT-II Reference Value in Data Monitor Mode
1519
ECM Terminals and Reference Value .................1519
On Board Diagnosis Logic ..................................1520
DTC Confirmation Procedure ..............................1521
Wiring Diagram ...................................................1522
Diagnostic Procedure ..........................................1523
Component Inspection ........................................1523
Removal and Installation .....................................1524
DTC P1301 - P1304 FUEL INJECTOR ADJUST-
MENT RESISTOR .................................................. 1525
Description ..........................................................1525
ECM Terminals and Reference Value .................1525
On Board Diagnosis Logic ..................................1525
DTC Confirmation Procedure ..............................1525
Wiring Diagram ...................................................1526
Diagnostic Procedure ..........................................1527
Component Inspection ........................................1528
Removal and Installation .....................................1528
DTC P1305 FUEL LEAK .......................................1529
On Board Diagnosis Logic ..................................1529
DTC Confirmation Procedure ..............................1529
Diagnostic Procedure ..........................................1529
Removal and Installation .....................................1529
DTC P1510 ACCELERATOR PEDAL RELEASED
POSITION SWITCH ...............................................1531
Description ..........................................................1531
CONSULT-II Reference Value in Data Monitor Mode
1531
ECM Terminals and Reference Value .................1531
On Board Diagnosis Logic ..................................1532
DTC Confirmation Procedure ..............................1532
Wiring Diagram ...................................................1533
Diagnostic Procedure ..........................................1534
Component Inspection ........................................1535
Removal and Installation .....................................1535
DTC P1606 ECM ...................................................1536
Description ..........................................................1536
On Board Diagnosis Logic ..................................1536
DTC Confirmation Procedure ..............................
1536
Diagnostic Procedure ..........................................1536
DTC P1621 ECM RELAY .......................................1538
ECM Terminals and Reference valve ..................1538
On Board Diagnosis Logic ..................................1538
DTC Confirmation Procedure ..............................1538
Wiring Diagram ...................................................1539
Diagnostic Procedure ..........................................1540
Component Inspection ........................................1541DTC P1660 BATTERY VOLTAGE .........................1542
On Board Diagnosis Logic ...................................1542
DTC Confirmation Procedure ..............................1542
Diagnostic Procedure ..........................................1542
GLOW CONTROL SYSTEM ..................................1544
Description ...........................................................1544
ECM Terminals and Reference Value ..................1544
Wiring Diagram ....................................................1545
Diagnostic Procedure ..........................................1546
Component Inspection .........................................1550
Removal and Installation .....................................1550
EGR VOLUME CONTROL SYSTEM .....................1551
Description ...........................................................1551
CONSULT-II Reference Value in Data Monitor Mode
1551
ECM Terminals and Reference Value ..................1552
Wiring Diagram ....................................................1553
Diagnostic Procedure ..........................................1554
Component Inspection .........................................1556
Removal and Installation .....................................1557
BRAKE SWITCH ....................................................1558
Description ...........................................................1558
ECM Terminals and Reference Value ..................1558
Wiring Diagram ....................................................1559
Diagnostic Procedure ..........................................1560
Component Inspection .........................................1561
PARK/NEUTRAL POSITION (PNP) SWITCH .......1562
Description ...........................................................1562
CONSULT-II Reference Value in Data Monitor Mode
1562
ECM Terminals and Reference Value ..................1562
Wiring Diagram ....................................................1563
Diagnostic Procedure ..........................................1564
START SIGNAL .....................................................1566
Wiring Diagram ....................................................1566
Diagnostic Procedure ..........................................1567
POWER STEERING OIL PRESSURE SWITCH ....1568
Component Description .......................................1568
CONSULT-II Reference Value in Data Monitor Mode
1568
ECM Terminals and Reference Value ..................1568
Wiring Diagram ....................................................1569
Diagnostic Procedure ..........................................1570
Component Inspection .........................................1571
Removal and Installation .....................................1571
AIR CONDITIONER CONTROL ............................1572
Wiring Diagram ....................................................1572
MI & DATA LINK CONNECTORS ..........................1573
Wiring Diagram ....................................................1573
SERVICE DATA AND SPECIFICATIONS (SDS) ...1574
General Specifications ......................................... 1574
Mass Air Flow Sensor ..........................................1574
Engine Coolant Temperature Sensor ..................1574
Common Rail Fuel Pressure Sensor ...................1574
Crankshaft Position Sensor (TDC) ......................1574
Camshaft Position Sensor ...................................1574
Glow Plug ............................................................1574
EGR Volume Control Valve .................................1574

EC-22
[QR25(WITH EURO-OBD)]
INDEX FOR DTC
*1: 1st trip DTC No. is the same as DTC No.
*2: These numbers are prescribed by ISO 15031-5.
*3: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*4: When engine is running.
*5: The trouble shooting for this DTC needs CONSULT-II.
*6: For A/T models.
*7: When the fail-safe operations for both self-diagnoses occur at the same time, the MI illuminates.
DTC No. IndexEBS00M02
Check if the vehicle is a model with Euro-OBD (E-OBD) system or not by the “Type approval number” on the
identification plate. Refer to GI-43, "
IDENTIFICATION PLATE" .
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
EC-122
.
×: Applicable –: Not applicable TP SEN 1/CIRC P0222 0222 1×EC-212
TP SEN 1/CIRC P0223 0223 1×EC-212
TW CATALYST SYS-B1 P0420 0420 2×EC-239
VEH SPD SEN/CIR AT*7P0720 0720 2×AT- 1 2 2
VEH SPEED SEN/CIRC*7P0500 0500 2×EC-250
Items
(CONSULT-II screen terms)DTC*
1
TripMI lighting
upReference page
CONSULT-II
GST*
2ECM*3
DTC*1
Items
(CONSULT-II screen terms)TripMI lighting
upReference page
CONSULT-II
GST*
2ECM*3
No DTC
Flashing*4NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.–
Flashing*4EC-59
U1000
1000*5CAN COMM CIRCUIT*61×EC-122
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.–– –
P0011 0011 INT/V TIM CONT-B1 2×EC-125
P0031 0031 HO2S1 HTR (B1) 2×EC-128
P0032 0032 HO2S1 HTR (B1) 2×EC-128
P0037 0037 HO2S2 HTR (B1) 2×EC-133
P0038 0038 HO2S2 HTR (B1) 2×EC-133
P0102 0102 MAF SEN/CIRCUIT 1×EC-138
P0103 0103 MAF SEN/CIRCUIT 1×EC-138
P0112 0112 IAT SEN/CIRCUIT 2×EC-144
P0113 0113 IAT SEN/CIRCUIT 2×EC-144
P0117 0117 ECT SEN/CIRCUIT 1×EC-149
P0118 0118 ECT SEN/CIRCUIT 1×EC-149
P0122 0122 TP SEN 2/CIRC 1×EC-154
P0123 0123 TP SEN 2/CIRC 1×EC-154
P0127 0127 IAT SENSOR 2×EC-160
P0132 0132 HO2S1 (B1) 2×EC-163
P0133 0133 HO2S1 (B1) 2×EC-169
P0134 0134 HO2S1 (B1) 2×EC-178

EC-24
[QR25(WITH EURO-OBD)]
INDEX FOR DTC
*1: 1st trip DTC No. is the same as DTC No.
*2: These numbers are prescribed by ISO 15031-5.
*3: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*4: When engine is running.
*5: The trouble shooting for this DTC needs CONSULT-II.
*6: For A/T models.
*7: When the fail-safe operations for both self-diagnoses occur at the same time, the MI illuminates. P1144 1144 HO2S1 (B1) 2×EC-301
P1146 1146 HO2S2 (B1) 2×EC-307
P1147 1147 HO2S2 (B1) 2×EC-315
P1217 1217 ENG OVER TEMP 1×EC-323
P1225 1225 CTP LEARNING 2 –EC-337
P1226 1226 CTP LEARNING 2 –EC-339
P1229 1229 SENSOR POWER/CIRC 1×EC-341
P1610 - P1615 1610 - 1615 NATS MALFUNCTION 2 –EC-58
P1705 1705 TP SEN/CIRC A/T 1×AT-180
P1706 1706 P-N POS SW/CIRCUIT 2×EC-345
P1760 1760 O/R CLTCH SOL/CIRC 2×AT-185
P1805 1805 BRAKE SW/CIRCUIT 2 –EC-349
P2122 2122 APP SEN 1/CIRC 1×EC-355
P2123 2123 APP SEN 1/CIRC 1×EC-355
P2127 2127 APP SEN 2/CIRC 1×EC-361
P2128 2128 APP SEN 2/CIRC 1×EC-361
P2135 2135 TP SENSOR 1×EC-367
P2138 2138 APP SENSOR 1×EC-373
DTC*1
Items
(CONSULT-II screen terms)TripMI lighting
upReference page
CONSULT-II
GST*
2ECM*3

PRECAUTIONS
EC-25
[QR25(WITH EURO-OBD)]
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EC
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EBS00NBQ
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
●To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
●Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
●Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness connec-
tors.
On Board Diagnostic (OBD) System of Engine and A/TEBS00M04
The ECM has an on board diagnostic system. It will light up the malfunction indicator (MI) to warn the driver of
a malfunction causing emission deterioration.
CAUTION:
●Be sure to turn the ignition switch OFF and disconnect the negative battery terminal before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves,
etc. will cause the MI to light up.
●Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MI to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
●Certain systems and components, especially those related to OBD, may use a new style slide-
locking type harness connector. For description and how to disconnect, refer to PG-68, "
HAR-
NESS CONNECTOR" .
●Be sure to route and secure the harnesses properly after work. The interference of the harness
with a bracket, etc. may cause the MI to light up due to the short circuit.
●Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MI to light up due to the malfunction of the fuel injection system, etc.
●Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PrecautionEBS00M05
●Always use a 12 volt battery as power source.
●Do not attempt to disconnect battery cables while engine is
running.
●Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative
battery terminal. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned off.
●Before removing parts, turn ignition switch OFF and then
disconnect battery ground cable.
SEF289H

EC-26
[QR25(WITH EURO-OBD)]
PRECAUTIONS
●Do not disassemble ECM.
●If a battery terminal is disconnected, the memory will return
to the ECM value.
The ECM will now start to self-control at its initial value.
Engine operation can vary slightly when the terminal is dis-
connected. However, this is not an indication of a malfunc-
tion. Do not replace parts because of a slight variation.
●When connecting ECM harness connector, fasten it
securely with a lever as far as it will go as shown at right.
●When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.
●Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge)
voltage to develop in coil and condenser, thus resulting in
damage to ICs.
●Keep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys-
tem malfunctions due to receiving external noise, degraded
operation of ICs, etc.
●Keep engine control system parts and harness dry.
●Before replacing ECM, perform “ECM Terminals and Refer-
ence Value” inspection and make sure ECM functions prop-
erly. Refer to EC-819
.
●Handle mass air flow sensor carefully to avoid damage.
●Do not disassemble mass air flow sensor.
●Do not clean mass air flow sensor with any type of deter-
gent.
●Do not disassemble electric throttle control actuator.
●Even a slight leak in the air intake system can cause seri-
ous incidents.
●Do not shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).
SEF707Y
SEF908W
PBIB0090E
MEF040D