2001 NISSAN X-TRAIL engine control

EC-1112
[QR20(WITH EURO-OBD)]
EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION SYSTEM
PFP:14950
DescriptionEBS00N2P
SYSTEM DESCRIPTION
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and
idling.
PBIB0491E

INDEX FOR DTC
EC-1119
[QR20(WITHOUT EURO-OBD)]
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[QR20(WITHOUT EURO-OBD)]INDEX FOR DTCPFP:00024
Alphabetical IndexEBS00N36
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-1199
.
×: Applicable —: Not applicable
*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*3: When engine is running.
*4: When the fail-safe operation occurs, the MI illuminates.
*5: The trouble shooting for this DTC needs CONSULT-II.
*6: Except for M/T models without ESP/TCS/ABS system.
*7: For M/T models with ESP/TCS/ABS system.Items
(CONSULT-II screen terms)DTC*
1
Trip MI lighting up Reference page
CONSULT-II
ECM*2
APP SEN/CIRCUIT P0121 0121 1×EC-1222
BRAKE SW/CIRCUIT P1805 1805 2 —EC-1301
CAN COMM CIRCUIT*6U1000
1000*51×EC-1199
CKP SEN/CIRCUIT P0335 0335 2×EC-1240
CMP SEN/CIRCUIT P0340 0340 2×EC-1246
ECM P0605 0605 1 or 2× or —EC-1262
ECM BACK UP/CIRC P1065 1065 2×EC-1269
ECT SEN/CIRCUIT*4P0117 0117 1×EC-1209
ECT SEN/CIRCUIT*4P0118 0118 1×EC-1209
ENG OVER TEMP P1217 1217 1×EC-1287
ETC ACTR P1121 1121 1 or 2×EC-1273
ETC FUNCTION/CIRC P1122 1122 1×EC-1275
ETC MOT RLY/CIRC P1123 1123 1 or 2× or —EC-1281
HO2S1 (B1) P0134 0134 2×EC-1229
KNOCK SEN/CIRC-B1 P0327 0327 2 —EC-1235
KNOCK SEN/CIRC-B1 P0328 0328 2 —EC-1235
MAF SEN/CIRCUIT*4 P0102 0102 1×EC-1202
MAF SEN/CIRCUIT*4 P0103 0103 1×EC-1202
MIL/CIRC P0650 0650 2 —EC-1265
NATS MALFUNCTIONP1610 -
P16151610 - 1615 2 —EC-1143
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.No DTC
Flashing*3—
Flashing*3EC-1144
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000———
PW ST P SEN/CIRC P0550 0550 2 —EC-1257
TCS/CIRC*7P1212 1212 2 —EC-1286
THRTL POS SEN/CIRC*4P0120 0120 1 or 2× or —EC-1214
VEH SPEED SEN/CIRC P0500 0500 2×EC-1252

EC-1120
[QR20(WITHOUT EURO-OBD)]
INDEX FOR DTC
DTC No. Index
EBS00N37
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-1199
.
×: Applicable —: Not applicable
*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*3: When engine is running.
*4: When the fail-safe operation occurs, the MI illuminates.
*5: The trouble shooting for this DTC needs CONSULT-II.
*6: Except for M/T models without ESP/TCS/ABS system.
*7: For M/T models with ESP/TCS/ABS system. DTC*
1Items
(CONSULT-II screen terms)Trip MI lighting up Reference page
CONSULT-II
ECM*
2
No DTC
Flashing*3NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.—
Flashing*3EC-1144
U1000
1000*5CAN COMM CIRCUIT*61×EC-1199
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.———
P0102 0102
MAF SEN/CIRCUIT*
41×EC-1202
P0103 0103
MAF SEN/CIRCUIT*41×EC-1202
P 0 11 7 0 11 7
ECT SEN/CIRCUIT*41×EC-1209
P 0 11 8 0 11 8
ECT SEN/CIRCUIT*41×EC-1209
P0120 0120
THRTL POS SEN/CIRC*41 or 2× or —EC-1214
P0121 0121 APP SEN/CIRCUIT 1×EC-1222
P0134 0134 HO2S1 (B1) 2×EC-1229
P0327 0327 KNOCK SEN/CIRC-B1 2 —EC-1235
P0328 0328 KNOCK SEN/CIRC-B1 2 —EC-1235
P0335 0335 CKP SEN/CIRCUIT 2×EC-1240
P0340 0340 CMP SEN/CIRCUIT 2×EC-1246
P0500 0500 VEH SPEED SEN/CIRC 2×EC-1252
P0550 0550 PW ST P SEN/CIRC 2 —EC-1257
P0605 0605 ECM 1 or 2× or —EC-1262
P0650 0650 MIL/CIRC 2 —EC-1265
P1065 1065 ECM BACK UP/CIRC 2×EC-1269
P1121 1121 ETC ACTR 1 or 2×EC-1273
P1122 1122 ETC FUNCTION/CIRC 1×EC-1275
P1123 1123 ETC MOT RLY/CIRC 1 or 2× or —EC-1281
P1212 1212
TCS/CIRC*72—EC-1286
P1217 1217 ENG OVER TEMP 1×EC-1287
P1610 - P1615 1610 - 1615 NATS MALFUNCTION 2 —EC-1143
P1805 1805 BRAKE SW/CIRCUIT 2 —EC-1301

PRECAUTIONS
EC-1121
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PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EBS00NBS
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/TEBS00N39
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.
PrecautionEBS00N3A
●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-1122
[QR20(WITHOUT 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-1166
.
●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

EC-1124
[QR20(WITHOUT EURO-OBD)]
PRECAUTIONS
●Do not depress accelerator pedal when starting.
●Immediately after starting, do not rev up engine unneces-
sarily.
●Do not rev up engine just prior to shutdown.
●When installing C.B. ham radio or a mobile phone, be sure
to observe the following as it may adversely affect elec-
tronic control systems depending on installation location.
–Keep the antenna as far as possible from the electronic
control units.
–Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.
–Adjust the antenna and feeder line so that the standing-
wave radio can be kept smaller.
–Be sure to ground the radio to vehicle body.
Wiring Diagrams and Trouble DiagnosisEBS00N3B
When you read Wiring diagrams, refer to the following:
●GI-13, "How to Read Wiring Diagrams"
●PG-2, "POWER SUPPLY ROUTING" for power distribution circuit
When you perform trouble diagnosis, refer to the following:
●GI-10, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"
●GI-23, "How to Perform Efficient Diagnosis for an Electrical Incident"
SEF709Y
SEF708Y

ENGINE CONTROL SYSTEM
EC-1127
[QR20(WITHOUT EURO-OBD)]
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ENGINE CONTROL SYSTEMPFP:23710
System DiagramEBS00N3E
PBIB0488E

EC-1128
[QR20(WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
Vacuum Hose Drawing
EBS00N3F
Refer to EC-1127, "System Diagram" for Vacuum Control System.
PBIB0489E