2009 INFINITI QX56 200

ECM
EC-453
< ECU DIAGNOSIS > [VK56DE]
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Fail-Safe ChartINFOID:0000000003771735
When the DTC listed below is detected, the EC
M enters fail-safe mode and the MIL lights up.
AABIA0046GB
Revision: December 20092009 QX56

EC-454
< ECU DIAGNOSIS >[VK56DE]
ECM
 When there is an open circuit on MIL circuit, the ECM c
annot warn the driver by lighting up MIL when there
is malfunction on engine control system.
Therefore, when electrical controlled throttle and pa rt of ECM related diagnoses are continuously detected
as NG for 5 trips, ECM warns the driver that engi ne control system malfunctions and MIL circuit is open by
means of operating fail-safe function.
The fail-safe function also operates when above diagnos es except MIL circuit are detected and demands the
driver to repair the malfunction.
DTC No. Detected items Engine operating condition in fail-safe mode
P0102
P0103 Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118 Engine coolant tempera-
ture sensor circuit Engine coolant temperature will be determined by ECM based on the following condition.
CONSULT-IIl displays the engine coolant temperature decided by ECM.
Condition Engine coolant temperature decided
(CONSULT-IIl display)
Just as ignition switch is turned ON
or START 40
°C (104 °F)
Approx 4 minutes or more after en-
gine starting. 80
°C (176 °F)
Except as shown above 40 - 80
°C (104 - 176 °F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.
P0122
P0123
P0222
P0223
P2135 Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
P0643 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P2100
P2103 Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2101 Electric throttle control function ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2118 Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P2119 Electric thro ttle control ac-
tuator (When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the
engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or
more.
P2122
P2123
P2127
P2128
P2138 Accelerator pedal position
sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut
Revision: December 20092009 QX56

ECM
EC-455
< ECU DIAGNOSIS > [VK56DE]
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DTC Inspection Priority ChartINFOID:0000000003771736
If some DTCs are displayed at the same time, per
form inspections one by one based on the following priority
chart.
NOTE:
 If DTC U1000 and/or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-86
.
 If DTC P0607 is displayed with ot her DTC, first perform the trouble diagnosis for DTC P0607. Refer to
EC-284
.
Priority Detected items (DTC)
1  U1000 U1001 CAN communication line  P0101 P0102 P0103 Mass air flow sensor
 P0112 P0113 P0127 Intake air temperature sensor
 P0116 P0117 P0118 P0125 Engine coolant temperature sensor
 P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor
 P0128 Thermostat function
 P0181 P0182 P0183 Fuel tank temperature sensor
 P0327 P0328 P0332 P0333 Knock sensor
 P0335 Crankshaft position sensor (POS)
 P0340 Camshaft posi tion sensor (PHASE)
 P0460 P0461 P0462 P0463 Fuel level sensor
 P0500 Vehicle speed sensor
 P0605 P0607 ECM
 P0643 Sensor power supply
 P0700 TCM
 P0705 Transmission range switch
 P0850 Park/neutral position (PNP) switch
 P1550 P1551 P1552 P1553 P1554 Battery current sensor
 P1610 - P1615 NATS
 P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
Revision: December 20092009 QX56

EC-456
< ECU DIAGNOSIS >[VK56DE]
ECM
DTC Index
INFOID:0000000003771737
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
× :Applicable —: Not applicable
2  P0031 P0032 P0051 P0052 Air fuel ratio (A/F) sensor 1 heater
 P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
 P0075 P0081 Intake valve timing control solenoid valve
 P0130 P0131 P0132 P0133 P0150 P0151 P0152 P0153 P2A00 P2A03 Air fuel ratio (A/F) sensor 1
 P0137 P0138 P0139 P0157 P0158 P0159 Heated oxygen sensor 2
 P0441 EVAP control system purge flow monitoring
 P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
 P0447 P0448 EVAP canister vent control valve
 P0451 P0452 P0453 EVAP control system pressure sensor
 P0550 Power steering pressure sensor
 P0603 ECM power supply
 P0710 P0717 P0720 P0731 P0732 P0733 P0734 P0735 P0740 P0744 P0745 P1730 P1752 P1757 P1762 P1767
P1772 P1774 A/T related sensors, solenoid valves and switches
 P1217 Engine over temperature (OVERHEAT)
 P1140 P1145 Intake valve timing control position sensor
 P1805 Brake switch
 P2100 P2103 P2118 Electric throttle control actuator
 P2101 Electric throttle control function
3  P0011 P0021 Intake valve timing control  P0171 P0172 P0174 P0175 Fuel injection system function
 P0300 - P0308 Misfire
 P0420 P0430 Three way catalyst function
 P0442 EVAP control system (SMALL LEAK)
 P0455 EVAP control system (GROSS LEAK)
 P0456 EVAP control sys tem (VERY SMALL LEAK)
 P0506 P0507 Idle speed control system
 P1148 P1168 Closed loop control
 P1211 TCS control unit
 P1212 TCS communication line
 P1421 Cold start control
 P1564 ICC/ASCD steering switch
 P1568 ICC command value
 P1572 ICC/ASCD brake switch
 P1574 ICC/ASCD vehicle speed sensor
 P2119 Electric throttle control actuator
Priority Detected items (DTC)
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip MIL
Reference
page
CONSULT-IIl
GST*
2ECM*3
CAN COMM CIRCUIT U1000 1000*5—1×EC-86
CAN COMM CIRCUIT U1001
1001*5—1 or 2*9
2*10—
EC-86
CONTROL UNIT(CAN) U1010 1010 — 1 ×EC-284
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED. P0000 0000
——
Flashing*7EC-55
INT/V TIM CONT-B1 P0011 0011 — 2 ×EC-40
INT/V TIM CONT-B2 P0021 0021 — 2 ×EC-40
A/F SEN1 HTR (B1) P0031 0031 — 2 ×EC-94
A/F SEN1 HTR (B1) P0032 0032 — 2 ×EC-94
HO2S2 HTR (B1) P0037 0037 — 2 ×EC-97
HO2S2 HTR (B1) P0038 0038 — 2 ×EC-97
A/F SEN1 HTR (B2) P0051 0051 — 2 ×EC-94
Revision: December 20092009 QX56

ECM
EC-457
< ECU DIAGNOSIS > [VK56DE]
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OA/F SEN1 HTR (B2) P0052 0052 — 2
×EC-94
HO2S2 HTR (B2) P0057 0057 — 2 ×EC-97
HO2S2 HTR (B2) P0058 0058 — 2 ×EC-97
INT/V TIM V/CIR-B1 P0075 0075 — 2 ×EC-100
INT/V TIM V/CIR-B2 P0081 0081 — 2 ×EC-100
MAF SEN/CIRCUIT-B1 P0101 0101 — 2 ×EC-103
MAF SEN/CIRCUIT-B1 P0102 0102 — 1 ×EC-109
MAF SEN/CIRCUIT-B1 P0103 0103 — 1 ×EC-109
IAT SEN/CIRCUIT-B1 P0112 0112 — 2 ×EC-114
IAT SEN/CIRCUIT-B1 P0113 0113 — 2 ×EC-114
ECT SEN/CIRC P0116 0116 — 2 ×EC-117
ECT SEN/CIRC P0117 0117 — 1 ×EC-120
ECT SEN/CIRC P0118 0118 — 1 ×EC-120
TP SEN 2/CIRC-B1 P0122 0122 — 1 ×EC-124
TP SEN 2/CIRC-B1 P0123 0123 — 1 ×EC-124
ECT SENSOR P0125 0125 — 2 ×EC-128
IAT SENSOR-B1 P0127 0127 — 2 ×EC-131
THERMSTAT FNCTN P0128 0128 — 2 ×EC-134
A/F SENSOR1 (B1) P0130 0130 — 2 ×EC-136
A/F SENSOR1 (B1) P0131 0131 — 2 ×EC-140
A/F SENSOR1 (B1) P0132 0132 — 2 ×EC-143
A/F SENSOR1 (B1) P0133 0133 ×2 ×EC-146
HO2S2 (B1) P0137 0137 ×2 ×EC-152
HO2S2 (B1) P0138 0138 ×2 ×EC-157
HO2S2 (B1) P0139 0139 ×2 ×EC-164
A/F SENSOR1 (B2) P0150 0150 — 2 ×EC-136
A/F SENSOR1 (B2) P0151 0151 — 2 ×EC-140
A/F SENSOR1 (B2) P0152 0152 — 2 ×EC-143
A/F SENSOR1 (B2) P0153 0153 ×2 ×EC-146
HO2S2 (B2) P0157 0157 ×2 ×EC-152
HO2S2 (B2) P0158 0158 ×2 ×EC-157
HO2S2 (B2) P0159 0159 ×2 ×EC-164
FUEL SYS-LEAN-B 1 P0171 0171 — 2 ×EC-169
FUEL SYS-RICH-B1 P0172 0172 — 2 ×EC-174
FUEL SYS-LEAN-B 2 P0174 0174 — 2 ×EC-169
FUEL SYS-RICH-B2 P0175 0175 — 2 ×EC-174
FTT SENSOR P0181 0181 — 2 ×EC-179
FTT SEN/CIRCUIT P0182 0182 — 2 ×EC-182
FTT SEN/CIRCUIT P0183 0183 — 2 ×EC-182
TP SEN 1/CIRC-B1 P0222 0222 — 1 ×EC-185
TP SEN 1/CIRC-B1 P0223 0223 — 1 ×EC-185
MULTI CYL MISFIRE P0300 0300 — 2 ×EC-189
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip MIL
Reference
page
CONSULT-IIl
GST*
2ECM*3
Revision: December 20092009 QX56

EC-458
< ECU DIAGNOSIS >[VK56DE]
ECM
CYL 1 MISFIRE P0301 0301 — 2
×EC-189
CYL 2 MISFIRE P0302 0302 — 2 ×EC-189
CYL 3 MISFIRE P0303 0303 — 2 ×EC-189
CYL 4 MISFIRE P0304 0304 — 2 ×EC-189
CYL 5 MISFIRE P0305 0305 — 2 ×EC-189
CYL 6 MISFIRE P0306 0306 — 2 ×EC-189
CYL 7 MISFIRE P0307 0307 — 2 ×EC-189
CYL 8 MISFIRE P0308 0308 — 2 ×EC-189
KNOCK SEN/CIRC-B1 P0327 0327 — 2 — EC-195
KNOCK SEN/CIRC-B1 P0328 0328 — 2 —EC-195
KNOCK SEN/CIRC-B2 P0332 0332 — 2 —EC-195
KNOCK SEN/CIRC-B2 P0333 0333 — 2 —EC-195
CKP SEN/CIRCUIT P0335 0335 — 2×EC-198
CMP SEN/CIRC-B1 P0340 0340 — 2 ×EC-202
TW CATALYST SYS-B1 P0420 0420 ×2 ×EC-206
TW CATALYST SYS-B2 P0430 0430 ×2 ×EC-206
EVAP PURG FLOW /MON P0441 0441 ×2 ×EC-210
EVAP SMALL LEAK P0442 0442 ×2 ×EC-215
PURG VOLUME CONT/V P0443 0443 — 2 ×EC-222
PURG VOLUME CONT/V P0444 0444 — 2 ×EC-227
PURG VOLUME CONT/V P0445 0445 — 2 ×EC-227
VENT CONTROL VALVE P0447 0447 — 2 ×EC-230
VENT CONTROL VALVE P0448 0448 — 2 ×EC-234
EVAP SYS PRES SEN P0451 0451 — 2 ×EC-238
EVAP SYS PRES SEN P0452 0452 — 2 ×EC-241
EVAP SYS PRES SEN P0453 0453 — 2 ×EC-245
EVAP GROSS LEAK P0455 0455 — 2 ×EC-250
EVAP VERY SML LEAK P0456 0456
×*42 ×EC-257
FUEL LEV SEN SLOSH P0460 0460 — 2 ×EC-265
FUEL LEVEL SENSOR P0461 0461 — 2 ×EC-267
FUEL LEVL SEN/CIRC P0462 0462 — 2 ×EC-269
FUEL LEVL SEN/CIRC P0463 0463 — 2 ×EC-269
VEH SPEED SEN/CIRC*6P0500 0500 — 2 ×EC-271
ISC SYSTEM P0506 0506 — 2 ×EC-273
ISC SYSTEM P0507 0507 — 2 ×EC-275
PW ST P SEN/CIRC P0550 0550 — 2 — EC-277
ECM BACK UP/CIRC P0603 0603 — 2×EC-280
ECM P0605 0605 — 1 or 2 × or — EC-282
SENSOR POWER/CIRC P0643 0643 — 1 ×EC-285
TRANSMISSION CONT P0700 0700 — 1 ×TM-43
T/M RANGE SENSOR A P0705 0705 — 2 ×TM-44
ATF TEMP SEN/CIRC P0710 0710 — 2 ×TM-72
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip MIL
Reference
page
CONSULT-IIl
GST*
2ECM*3
Revision: December 20092009 QX56

ECM
EC-459
< ECU DIAGNOSIS > [VK56DE]
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OOUTPUT SPEED SENSOR*6P0720 0720 — 2
×TM-49
1GR INCORRECT RATIO P0731 0731 — 2 ×TM-54
2GR INCORRECT RATIO P0732 0732 — 2 ×TM-56
3GR INCORRECT RATIO P0733 0733 — 2 ×TM-58
4GR INCORRECT RATIO P0734 0734 — 2 ×TM-60
5GR INCORRECT RATIO P0735 0735 — 2 ×TM-62
TORQUE CONVERTER P0740 0740 — 2 ×TM-64
TORQUE CONVERTER P0744 0744 — 2 ×TM-66
PC SOLENOID A P0745 0745 — 2 ×TM-68
P-N POS SW/CIRCUIT P0850 0850 — 2 ×EC-288
INTK TIM S/CIRC-B1 P1140 1140 — 2 ×EC-291
INTK TIM S/CIRC-B2 P1145 1145 — 2 ×EC-291
CLOSED LOOP-B1 P1148 1148 — 1 ×EC-295
CLOSED LOOP-B2 P1168 1168 — 1 ×EC-295
TCS C/U FUNCTN P1211 1211 — 2 — EC-296
TCS/CIRC P1212 1212 — 2 —EC-297
ENG OVER TEMP P1217 1217 — 1×EC-36
CTP LEARNING-B1 P1225 1225 — 2 — EC-302
CTP LEARNING-B1 P1226 1226 — 2 —EC-304
COLD START CONTROL P1421 1421 — 2×EC-306
BAT CURRENT SENSOR P1550 1550 — 2 — EC-308
BAT CURRENT SENSOR P1551 1551 — 2 —EC-312
BAT CURRENT SENSOR P1552 1552 — 2 —EC-312
BAT CURRENT SENSOR P1553 1553 — 2 —EC-316
BAT CURRENT SENSOR P1554 1554 — 2 —EC-320
ASCD SW P1564 1564 — 1 —EC-324

(Models
with ICC) EC-328

(Models
with ASCD)
ICC COMMAND VALUE*
9P1568 1568 — 1 — EC-332
ASCD BRAKE SW P1572 1572 — 1 — EC-333

(Models
with ICC) EC-339

(Models
with ASCD)
ASCD VHL SPD SEN*
8P1574 1574 — 1 — EC-344

(Models
with ICC)
EC-346

(Models
with ASCD)
ID DISCARD IMM-ECM P1611 1611 — 2 — SEC-37
CHAIN OF ECM-IMMU P1612 1612 — 2 —SEC-33
CHAIN OF IMMU-KEY P1614 1614 — 2 —SEC-27
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip MIL
Reference
page
CONSULT-IIl
GST*
2ECM*3
Revision: December 20092009 QX56

EC-460
< 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:0000000004114214
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 malfunc tion 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 P1615 1615 — 2 — SEC-30
INTERLOCK P1730 1730 — 1×TM-76
INPUT CLUTCH SOL P1752 1752 — 1 ×TM-80
FR BRAKE SOLENOID P1757 1757 — 1 ×TM-82
DRCT CLUTCH SOL P1762 1762 — 1 ×TM-84
HLR CLUTCH SOLENOID P1767 1767 — 1 ×TM-86
L C BRAKE SOLENOID P1772 1772 — 1 ×TM-88
L C BRAKE SOLENOID P1774 1774 — 1 ×TM-90
BRAKE SW/CIRCUIT P1805 1805 — 2 — EC-348
ETC MOT PWR-B1 P2100 2100 — 1×EC-351
ETC FUNCTION/CIRC-B1 P2101 2101 — 1 ×EC-354
ETC MOT PWR P2103 2103 — 1 ×EC-351
ETC MOT-B1 P2118 2118 — 1 ×EC-358
ETC ACTR-B1 P2119 2119 — 1 ×EC-360
APP SEN 1/CIRC P2122 2122 — 1 ×EC-362
APP SEN 1/CIRC P2123 2123 — 1 ×EC-362
APP SEN 2/CIRC P2127 2127 — 1 ×EC-365
APP SEN 2/CIRC P2128 2128 — 1 ×EC-365
TP SENSOR-B1 P2135 2135 — 1 ×EC-369
APP SENSOR P2138 2138 — 1 ×EC-373
A/F SENSOR1 (B1) P2A00 2A00 — 2 ×EC-377
A/F SENSOR1 (B2) P2A03 2A03 — 2 ×EC-377
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip MIL
Reference
page
CONSULT-IIl
GST*
2ECM*3
Revision: December 20092009 QX56