2008 INFINITI QX56 fl sensor

EC-464
< ECU DIAGNOSIS >[VK56DE]
ECM
CYL 1 MISFIRE
P03010301—2×EC-198
CYL 2 MISFIRE P03020302—2×EC-198
CYL 3 MISFIRE P03030303—2×EC-198
CYL 4 MISFIRE P03040304—2×EC-198
CYL 5 MISFIRE P03050305—2×EC-198
CYL 6 MISFIRE P03060306—2×EC-198
CYL 7 MISFIRE P03070307—2×EC-198
CYL 8 MISFIRE P03080308—2×EC-198
KNOCK SEN/CIRC-B1 P03270327—2—EC-204
KNOCK SEN/CIRC-B1 P03280328—2—EC-204
KNOCK SEN/CIRC-B2 P03320332—2—EC-204
KNOCK SEN/CIRC-B2 P03330333—2—EC-204
CKP SEN/CIRCUIT P03350335—2×EC-207
CMP SEN/CIRC-B1 P03400340—2×EC-211
TW CATALYST SYS-B1 P04200420 ×2 ×EC-215
TW CATALYST SYS-B2 P04300430 ×2 ×EC-215
EVAP PURG FLOW /MON P0441 0441 ×2 ×EC-219
EVAP SMALL LEAK P04420442 ×2 ×EC-224
PURG VOLUME CONT/V P04430443—2×EC-231
PURG VOLUME CONT/V P04440444—2×EC-236
PURG VOLUME CONT/V P04450445—2×EC-236
VENT CONTROL VALVE P04470447—2×EC-239
VENT CONTROL VALVE P04480448—2×EC-243
EVAP SYS PRES SEN P04510451—2×EC-247
EVAP SYS PRES SEN P04520452—2×EC-250
EVAP SYS PRES SEN P04530453—2×EC-254
EVAP GROSS LEAK P04550455—2×EC-259
EVAP VERY SML LEAK P04560456
×*42 ×EC-266
FUEL LEV SEN SLOSH P04600460—2×EC-274
FUEL LEVEL SENSOR P04610461—2×EC-276
FUEL LEVL SEN/CIRC P04620462—2×EC-278
FUEL LEVL SEN/CIRC P04630463—2×EC-278
VEH SPEED SEN/CIRC*6P0500 0500—2×EC-280
ISC SYSTEM P05060506—2×EC-282
ISC SYSTEM P05070507—2×EC-284
PW ST P SEN/CIRC P05500550—2—EC-286
ECM BACK UP/CIRC P06030603—2×EC-289
ECM P06050605—1 or 2 × or — EC-291
SENSOR POWER/CIRC P06430643—1×EC-293
TRANSMISSION CONT P07000700—1×TM-42
T/M RANGE SENSOR A P07050705—2×TM-43
ATF TEMP SEN/CIRC P07100710—2×TM-71
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip
MILReference
page
CONSULT-IIl
GST*
2ECM*3
Revision: March 2010 2008 QX56

ECM
EC-465
< ECU DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
OOUTPUT SPEED SENSOR*6P0720
0720—2×TM-48
1GR INCORRECT RATIO P07310731—2×TM-53
2GR INCORRECT RATIO P07320732—2×TM-55
3GR INCORRECT RATIO P07330733—2×TM-57
4GR INCORRECT RATIO P07340734—2×TM-59
5GR INCORRECT RATIO P07350735—2×TM-61
TORQUE CONVERTER P07400740—2×TM-63
TORQUE CONVERTER P07440744—2×TM-65
PC SOLENOID A P07450745—2×TM-67
P-N POS SW/CIRCUIT P08500850—2×EC-296
INTK TIM S/CIRC-B1 P11401140—2×EC-299
INTK TIM S/CIRC-B2 P11451145—2×EC-299
CLOSED LOOP-B1 P11481148—1×EC-303
CLOSED LOOP-B2 P11681168—1×EC-303
TCS C/U FUNCTN P12111211—2—EC-304
TCS/CIRC P12121212—2—EC-305
ENG OVER TEMP P12171217—1×EC-36
CTP LEARNING-B1 P12251225—2—EC-310
CTP LEARNING-B1 P12261226—2—EC-312
COLD START CONTROL P14211421—2×EC-314
BAT CURRENT SENSOR P15501550—2—EC-316
BAT CURRENT SENSOR P15511551—2—EC-320
BAT CURRENT SENSOR P15521552—2—EC-320
BAT CURRENT SENSOR P15531553—2—EC-324
BAT CURRENT SENSOR P15541554—2—EC-328
ASCD SW P15641564—1—EC-332

(Models
with ICC) EC-336

(Models
with ASCD)
ICC COMMAND VALUE*
9P1568 1568—1—EC-340
ASCD BRAKE SW P15721572—1—EC-341

(Models
with ICC) EC-347

(Models
with ASCD)
ASCD VHL SPD SEN*
8P1574 1574—1—EC-352

(Models
with ICC)
EC-354

(Models
with ASCD)
ID DISCARD IMM-ECM P16111611—2—SEC-39
CHAIN OF ECM-IMMU P16121612—2—SEC-35
CHAIN OF IMMU-KEY P16141614—2—SEC-29
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip
MILReference
page
CONSULT-IIl
GST*
2ECM*3
Revision: March 2010 2008 QX56

EC-466
< ECU DIAGNOSIS >[VK56DE]
ECM
*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012.
*3: In Diagnostic Test
Mode II (Self-diagnostic results), this number is controlled by NISSAN.
*4: SRT code will not be set if the self-diagnostic result is NG.
*5: The troubleshooting for this DTC needs CONSULT-III.
*6: When the fail-safe operations for both self-diagnoses occur, the MIL illuminates.
*7: When the ECM is in the mode of displaying SRT status, MIL may flash. For the details, refer to "How to Display SRT Status".
*8: 2WD models
*9: Models with ICC
*10: Models without ICC
Emission-related Diagnostic InformationINFOID:0000000001534998
DTC AND 1ST TRIP DTC
The 1st trip DTC (whose number is the same as the DT C number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previous ly, and the 1st trip DTC did not reoccur, the 1st trip
DTC will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are stored in t he ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL light s up when the same malfunction occurs in two consec-
utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd
trips, only the 1st trip DTC will continue to be stored. Fo r malfunctions that blink or light up the MIL during the
1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
DIFFERENCE OF KEY P16151615—2—SEC-32
INTERLOCK P17301730—1×TM-76
IINPUT CLUTCH SOL P17521752—1×TM-80
FR BRAKE SOLENOID P17571757—1×TM-82
DRCT CLUTCH SOL P17621762—1×TM-84
HLR CLUTCH SOLENOID P17671767—1×TM-86
L C BRAKE SOLENOID P17721772—1×TM-88
L C BRAKE SOLENOID P17741774—1×TM-90
BRAKE SW/CIRCUIT P18051805—2—EC-356
ETC MOT PWR-B1 P21002100—1×EC-359
ETC FUNCTION/CIRC-B1 P21012101—1×EC-362
ETC MOT PWR P21032103—1×EC-359
ETC MOT-B1 P21182118—1×EC-366
ETC ACTR-B1 P21192119—1×EC-368
APP SEN 1/CIRC P21222122—1×EC-370
APP SEN 1/CIRC P21232123—1×EC-370
APP SEN 2/CIRC P21272127—1×EC-373
APP SEN 2/CIRC P21282128—1×EC-373
TP SENSOR-B1 P21352135—1×EC-377
APP SENSOR P21382138—1×EC-381
A/F SENSOR1 (B1) P2A002A00—2×EC-385
A/F SENSOR1 (B2) P2A032A03—2×EC-385
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip
MILReference
page
CONSULT-IIl
GST*
2ECM*3
Revision: March 2010 2008 QX56

EC-468
< ECU DIAGNOSIS >[VK56DE]
ECM
frame data with the same priority occurs later, t
he first (original) freeze frame data remains unchanged in the
ECM memory.
Both 1st trip freeze frame data and freeze frame dat a (along with the DTCs) are cleared when the ECM mem-
ory is erased. Procedures for clearing the ECM me mory are described in "HOW TO ERASE EMISSION-
RELATED DIAGNOSTIC INFORMATION".
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Service $01 of SAE J1979.
As part of an enhanced emissions test for Inspection & Ma intenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission s\
ystems and com-
ponents. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspec tion due to one or more SRT items indicating “INCMP”, use
the information in this Service Manual to set the SRT to “CMPLT”.
In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's
normal driving pattern; the SRT will indicate “INCMP” for these items.
NOTE:
The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM mem-
ory power supply is interrupted for several hours.
If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will con-
tinue with the emissions test. However, if the SRT indi cates “INCMP” for one or more of the SRT items the
vehicle is returned to the customer untested.
NOTE:
If MIL is ON during the state emissions inspection, the vehicle is also returned to the customer untested even
though the SRT indicates “CMPLT” for all test items. Therefore, it is important to check SRT (“CMPLT”) and
DTC (No DTCs) before the inspection.
SRT Item
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.
*: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the pr iority for
models with CONSULT-III.
SRT Set Timing
SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is
done regardless of whether the result is OK or NG. T he set timing is different between OK and NG results and
is shown in the table below.
SRT item
(CONSULT-III indication) Performance
Priority* Required self-diagnostic items to set the SRT to “CMPLT”
Corresponding
DTC No.
CATALYST 2 Three way catalyst function P0420, P0430
EVAP SYSTEM 2 EVAP control system purge flow monitoring P0441
1 EVAP control system P0442
2 EVAP control system P0456
HO2S 2 Air fuel ratio (A/F) sensor 1 P0133, P0153
Heated oxygen sensor 2 P0137, P0157
Heated oxygen sensor 2 P0138, P0158
Heated oxygen sensor 2 P0139, P0159
Self-diagnosis result Example
Diagnosis Ignition cycle
← ON → OFF ← ON → OFF ← ON → OFF ← ON →
Revision: March 2010 2008 QX56

EC-474
< ECU DIAGNOSIS >[VK56DE]
ECM
ItemOBD-
MID Self-diagnostic test item
DTCTest value and Test
limit
(GST display) Description
TID Unit and
Scaling ID
HO2S 01H
Air fuel ratio (A/F) sensor 1
(Bank 1) P0131 83H 0BH
Minimum sensor output voltage
for test cycle
P0131 84H 0BH Maximum sensor output voltage
for test cycle
P0130 85H 0BH Minimum sensor output voltage
for test cycle
P0130 86H 0BH Maximum sensor output voltage
for test cycle
P0133 87H 04H Response rate: Response ratio
(Lean to Rich)
P0133 88H 04H Response rate: Response ratio
(Rich to Lean)
P2A00 89H 84H The amount of shift in air fuel ratio
P2A00 8AH 84H The amount of shift in air fuel ratio
P0130 8BH 0BH Difference in sensor output volt-
age
P0133 8CH 83H Response gain at the limited fre-
quency
02H Heated oxygen sensor 2
(Bank 1) P0138 07H 0CH
Minimum sensor output voltage
for test cycle
P0137 08H 0CH Maximum sensor output voltage
for test cycle
P0138 80H 0CH Sensor output voltage
P0139 81H 0CH Difference in sensor output volt-
age
03H Heated oxygen sensor 3
(Bank 1) P0143 07H 0CH
Minimum sensor output voltage
for test cycle
P0144 08H 0CH Maximum sensor output voltage
for test cycle
P0146 80H 0CH Sensor output voltage
P0145 81H 0CH Difference in sensor output volt-
age
Revision: March 2010
2008 QX56

ECM
EC-475
< ECU DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
HO2S 05H
Air fuel ratio (A/F) sensor 1
(Bank 2) P0151 83H 0BH
Minimum sensor output voltage
for test cycle
P0151 84H 0BH Maximum sensor output voltage
for test cycle
P0150 85H 0BH Minimum sensor output voltage
for test cycle
P0150 86H 0BH Maximum sensor output voltage
for test cycle
P0153 87H 04H Response rate: Response ratio
(Lean to Rich)
P0153 88H 04H Response rate: Response ratio
(Rich to Lean)
P2A03 89H 84H The amount of shift in air fuel ratio
P2A03 8AH 84H The amount of shift in air fuel ratio
P0150 8BH 0BH Difference in sensor output volt-
age
P0153 8CH 83H Response gain at the limited fre-
quency
06H Heated oxygen sensor 2
(Bank 2) P0158 07H 0CH
Minimum sensor output voltage
for test cycle
P0157 08H 0CH Maximum sensor output voltage
for test cycle
P0158 80H 0CH Sensor output voltage
P0159 81H 0CH Difference in sensor output volt-
age
07H Heated oxygen sensor 3
(Bank2) P0163 07H 0CH
Minimum sensor output voltage
for test cycle
P0164 08H 0CH Maximum sensor output voltage
for test cycle
P0166 80H 0CH Sensor output voltage
P0165 81H 0CH Difference in sensor output volt-
age
CATA-
LYST 21H
Three way catalyst function
(Bank1) P0420 80H 01H O2 storage index
P0420 82H 01H
Switching time lag engine exhaust
index value
P2423 83H 0CH Difference in 3rd O2 sensor out-
put voltage
P2423 84H 84H O2 storage index in HC trap cata-
lyst
22H Three way catalyst function
(Bank2) P0430 80H 01H O2 storage index
P0430 82H 01H
Switching time lag engine exhaust
index value
P2424 83H 0CH Difference in 3rd O2 sensor out-
put voltage
P2424 84H 84H O2 storage index in HC trap cata-
lyst
Item
OBD-
MID Self-diagnostic test item
DTCTest value and Test
limit
(GST display) Description
TID Unit and
Scaling ID
Revision: March 2010 2008 QX56

EC-476
< ECU DIAGNOSIS >[VK56DE]
ECM
EGR
SYSTEM31H EGR function P0400 80H 96H
Low Flow Faults: EGR temp
change rate (short term)
P0400 81H 96H Low Flow Faults: EGR temp
change rate (long term)
P0400 82H 96H Low Flow Faults: Difference be-
tween max EGR temp and EGR
temp under idling condition
P0400 83H 96H Low Flow Faults: Max EGR temp
P1402 84H 96H High Flow Faults: EGR temp in-
crease rate
EVAP
SYSTEM 39H
EVAP control
system leak
(Cap Off) P0455 80H 0CHDifference in pressure sensor out-
put voltage before and after pull
down
3BH EVAP control
system leak
(Small leak) P0442 80H 05H
Leak area index (for more than
0.04inch)
3CH EVAP control system
(Very small leak) P0456 80H 05H
Leak area index (for more than
0.02inch)
P0456 81H FDH Maximum internal pressure of
EVAP system during monitoring
3DH Purge flow system P0441 83H 0CHDifference in pressure sensor out-
put voltage before and after vent
control value close
O2 SEN-
SOR
HEATER 41H
A/F sensor 1 heater
(Bank 1) Low Input:P0031
High Input:P0032 81H 0BHConverted value of Heater electric
current to voltage
42H Heated oxygen sensor 2
(Bank 1) Low Input:P0037
High Input:P0038 80H 0CH
Converted value of Heater electric
current to voltage
43H Heated oxygen sensor 3
(Bank 1) P0043 80H 0CHConverted value of Heater electric
current to voltage
45H A/F sensor 1 heater
(Bank 2) Low Input:P0051
High Input:P0052 81H 0BHConverted value of Heater electric
current to voltage
46H Heated oxygen sensor 2
(Bank 2) Low Input:P0057
High Input:P0058 80H 0CHConverted value of Heater electric
current to voltage
47H Heated oxygen sensor 3
(Bank 2) P0063 80H 0CH
Converted value of Heater electric
current to voltage
SEC-
OND-
ARY AIR 71H Secondary Air system P0411 80H 01H
Secondary Air Injection System
Incorrect Flow Detected
Bank1: P0491
Bank2: P0492 81
H 0
1HSe
condary Air Injection System
Insufficient Flow
P2445 82H 01H Secondary Air Injection System
Pump Stuck Off
P2448 83H 01H Secondary Air Injection System
High Airflow
Bank1: P2440
Bank2: P2442 84H 01HSecondary Air Injection System
Switching Valve Stuck Open
P2440 85H 01H Secondary Air Injection System
Switching Valve Stuck Open
P2444 86H 01H Secondary Air Injection System
Pump Stuck On
Item
OBD-
MID Self-diagnostic test item
DTCTest value and Test
limit
(GST display) Description
TID Unit and
Scaling ID
Revision: March 2010 2008 QX56

EC-482
< SYMPTOM DIAGNOSIS >[VK56DE]
ENGINE CONTROL SYSTEM SYMPTOMS
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
SYSTEM — ENGINE MECHANICAL & OTHER
Mass air flow sensor circuit
1
12 2
222 2 EC-106,
EC-113
Engine coolant temperature sensor circuit
333
EC-124,
EC-132
Air fuel ratio (A/F ) sensor 1 circuit EC-141
,
EC-145
,
EC-149
,
EC-153
,
EC-385
Throttle position sensor circuit
22EC-128
,
EC-194
,
EC-310
,
EC-312
,
EC-377
Accelerator pedal position sensor circuit 3 2 1EC-289
,
EC-370
,
EC-373
,
EC-381
Knock sensor circuit 23EC-204
Crankshaft position sensor (POS) circuit 2 2 EC-207
Camshaft position sensor (PHASE) circuit 3 2 EC-211
Vehicle speed signal circuit2 3 33EC-280
Power steering pressu re sensor circuit 23 3 EC-286
ECM 22333333333 EC-289,
EC-291
Intake valve timing control solenoid valve cir-
cuit 32 13223 3
EC-103
Park/Neutral position (PNP) signal circuit3 3 3 33EC-296
Refrigerant pressure sensor circuit 233 4 EC-423
Electrical load signal circuit 3EC-397
Air conditioner circuit 223333333 3 2 HAC-24
ABS actuator and electric unit (control unit) 4 BRC-37
SYMPTOM
Refer-
ence page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Revision: March 2010 2008 QX56