2007 INFINITI QX56 DTC

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Page 1102 of 3061

INFINITI QX56 2007 Factory Service Manual PRECAUTIONS
EC-19
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•After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not b

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INFINITI QX56 2007 Factory Service Manual EC-48
< SERVICE INFORMATION >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ON BOARD DIAGNOSTIC (OBD) SYSTEM
IntroductionINFOID:0000000003531604
The ECM has an on board diagnostic system, which detects malfunction

EC-48
< SERVICE INFORMATION >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ON BOARD DIAGNOSTIC (OBD) SYSTEM
IntroductionINFOID:0000000003531604
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
The above information can be checked using procedures listed in the table below.
×: Applicable —: Not applicable
*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected
in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-88,
"Fail-Safe Chart".)
Two Trip Detection LogicINFOID:0000000003531605
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
×: Applicable —: Not applicable
When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is
malfunction on engine control system.
Emission-related diagnostic information Diagnostic service
Diagnostic Trouble Code (DTC) Service $03 of SAE J1979
Freeze Frame data Service $02 of SAE J1979
System Readiness Test (SRT) code Service $01 of SAE J1979
1st Trip Diagnostic Trouble Code (1st Trip DTC) Service $07 of SAE J1979
1st Trip Freeze Frame data
Test values and Test limits Service $06 of SAE J1979
Calibration ID Service $09 of SAE J1979
DTC 1st trip DTCFreeze
Frame data1st trip Freeze
Frame dataSRT code SRT status Test value
CONSULT-II×× × × × ×—
GST×× ×—×××
ECM××*— — —×—
ItemsMIL DTC 1st trip DTC
1st trip 2nd trip
1st trip
displaying2nd trip
displaying1st trip
displaying2nd trip
display-
ing BlinkingLighting
upBlinkingLighting
up
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0308 is
being detected×———— —×—
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0308 is
being detected——×——×——
One trip detection diagnoses (Re-
fer to EC-49, "
Emission-related Di-
agnostic Information".)—×——×———
Except above — — —×—××—

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INFINITI QX56 2007 Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
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Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detecte

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as
NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means
of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the
driver to repair the malfunction.
Emission-related Diagnostic InformationINFOID:0000000003531606
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
×:Applicable —: Not applicable
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTe s t v a l u e /
Test limit
(GST only)Trip MILRefer-
ence page CONSULT-II
GST*
2ECM*3
CAN COMM CIRCUIT U1000
1000*5—— 1×EC-145
CAN COMM CIRCUIT U1001
1001*5——1 or 2
2*10—EC-145
CONTROL UNIT(CAN) U1010 1010 — — 1×EC-147
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000———
Flashing*7EC-63
INT/V TIM CONT-B1 P0011 0011 — — 2×EC-149
INT/V TIM CONT-B2 P0021 0021 — — 2×EC-149
A/F SEN1 HTR (B1) P0031 0031 —×2×EC-163
A/F SEN1 HTR (B1) P0032 0032 —×2×EC-163
HO2S2 HTR (B1) P0037 0037 —×2×EC-170
HO2S2 HTR (B1) P0038 0038 —×2×EC-170
A/F SEN1 HTR (B2) P0051 0051 —×2×EC-163
A/F SEN1 HTR (B2) P0052 0052 —×2×EC-163
HO2S2 HTR (B2) P0057 0057 —×2×EC-170
HO2S2 HTR (B2) P0058 0058 —×2×EC-170
INT/V TIM V/CIR-B1 P0075 0075 — — 2×EC-178
INT/V TIM V/CIR-B2 P0081 0081 — — 2×EC-178
MAF SEN/CIRCUIT P0101 0101 — — 2×EC-186
MAF SEN/CIRCUIT P0102 0102 — — 1×EC-194
MAF SEN/CIRCUIT P0103 0103 — — 1×EC-194
IAT SEN/CIRCUIT P0112 0112 — — 2×EC-201
IAT SEN/CIRCUIT P0113 0113 — — 2×EC-201
ECT SEN/CIRC P0117 0117 — — 1×EC-205
ECT SEN/CIRC P0118 0118 — — 1×EC-205
TP SEN 2/CIRC P0122 0122 — — 1×EC-210
TP SEN 2/CIRC P0123 0123 — — 1×EC-210
ECT SENSOR P0125 0125 — — 2×EC-217
IAT SENSOR P0127 0127 — — 2×EC-220
THERMSTAT FNCTN P0128 0128 — — 2×EC-223
A/F SENSOR1 (B1) P0130 0130 —×2×EC-225
A/F SENSOR1 (B1) P0131 0131 —×2×EC-234
A/F SENSOR1 (B1) P0132 0132 —×2×EC-242

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INFINITI QX56 2007 Factory Service Manual EC-50
< SERVICE INFORMATION >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
A/F SENSOR1 (B1) P0133 0133××2×EC-250
HO2S2 (B1) P0137 0137××2×EC-260
HO2S2 (B1) P0138 0138××2×EC-270
HO2S2 (B1) P0139 0139××2

EC-50
< SERVICE INFORMATION >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
A/F SENSOR1 (B1) P0133 0133××2×EC-250
HO2S2 (B1) P0137 0137××2×EC-260
HO2S2 (B1) P0138 0138××2×EC-270
HO2S2 (B1) P0139 0139××2×EC-282
A/F SENSOR1 (B2) P0150 0150 —×2×EC-225
A/F SENSOR1 (B2) P0151 0151 —×2×EC-234
A/F SENSOR1 (B2) P0152 0152 —×2×EC-242
A/F SENSOR1 (B2) P0153 0153××2×EC-250
HO2S2 (B2) P0157 0157××2×EC-260
HO2S2 (B2) P0158 0158××2×EC-270
HO2S2 (B2) P0159 0159××2×EC-282
FUEL SYS-LEAN-B1 P0171 0171 — — 2×EC-292
FUEL SYS-RICH-B1 P0172 0172 — — 2×EC-301
FUEL SYS-LEAN-B2 P0174 0174 — — 2×EC-292
FUEL SYS-RICH-B2 P0175 0175 — — 2×EC-301
FTT SENSOR P0181 0181 — — 2×EC-310
FTT SEN/CIRCUIT P0182 0182 — — 2×EC-314
FTT SEN/CIRCUIT P0183 0183 — — 2×EC-314
TP SEN 1/CIRC P0222 0222 — — 1×EC-318
TP SEN 1/CIRC P0223 0223 — — 1×EC-318
MULTI CYL MISFIRE P0300 0300 — — 2×EC-325
CYL 1 MISFIRE P0301 0301 — — 2×EC-325
CYL 2 MISFIRE P0302 0302 — — 2×EC-325
CYL 3 MISFIRE P0303 0303 — — 2×EC-325
CYL 4 MISFIRE P0304 0304 — — 2×EC-325
CYL 5 MISFIRE P0305 0305 — — 2×EC-325
CYL 6 MISFIRE P0306 0306 — — 2×EC-325
CYL 7 MISFIRE P0307 0307 — — 2×EC-325
CYL 8 MISFIRE P0308 0308 — — 2×EC-325
KNOCK SEN/CIRC-B1 P0327 0327 — — 2 —EC-332
KNOCK SEN/CIRC-B1 P0328 0328 — — 2 —EC-332
KNOCK SEN/CIRC-B2 P0332 0332 — — 2 —EC-332
KNOCK SEN/CIRC-B2 P0333 0333 — — 2 —EC-332
CKP SEN/CIRCUIT P0335 0335 — — 2×EC-336
CMP SEN/CIRC-B1 P0340 0340 — — 2×EC-342
TW CATALYST SYS-B1 P0420 0420××2×EC-349
TW CATALYST SYS-B2 P0430 0430××2×EC-349
EVAP PURG FLOW/MON P0441 0441××2×EC-354
EVAP SMALL LEAK P0442 0442××2×EC-359
PURG VOLUME CONT/V P0443 0443 — — 2×EC-366
PURG VOLUME CONT/V P0444 0444 — — 2×EC-373
PURG VOLUME CONT/V P0445 0445 — — 2×EC-373
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTest value/
Test limit
(GST only)Trip MILRefer-
ence page CONSULT-II
GST*
2ECM*3

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INFINITI QX56 2007 Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-51
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P OVENT CONTROL VALVE P0447 0447 — — 2×EC-379
VENT CONTROL VALVE P0448 0448 — — 2×EC-386
EVAP SYS P

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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P OVENT CONTROL VALVE P0447 0447 — — 2×EC-379
VENT CONTROL VALVE P0448 0448 — — 2×EC-386
EVAP SYS PRES SEN P0451 0451 — — 2×EC-392
EVAP SYS PRES SEN P0452 0452 — — 2×EC-395
EVAP SYS PRES SEN P0453 0453 — — 2×EC-401
EVAP GROSS LEAK P0455 0455 — — 2×EC-408
EVAP VERY SML LEAK P0456 0456
×*4×2×EC-415
FUEL LEV SEN SLOSH P0460 0460 — — 2×EC-423
FUEL LEVEL SENSOR P0461 0461 — — 2×EC-425
FUEL LEVL SEN/CIRC P0462 0462 — — 2×EC-427
FUEL LEVL SEN/CIRC P0463 0463 — — 2×EC-427
VEH SPEED SEN/CIRC*6P0500 0500 — — 2×EC-429
ISC SYSTEM P0506 0506 — — 2×EC-431
ISC SYSTEM P0507 0507 — — 2×EC-433
PW ST P SEN/CIRC P0550 0550 — — 2 —EC-435
ECM BACK UP/CIRC P0603 0603 — — 2×EC-440
ECM P0605 0605 — — 1 or 2× or —EC-444
SENSOR POWER/CIRC P0643 0643 — — 1×EC-447
TCM P0700 0700 — — 1×AT- 9 8
PNP SW/CIRC P0705 0705 — — 2×AT- 9 9
ATF TEMP SEN/CIRC P0710 0710 — — 2×AT- 11 9
VHCL SPD SEN/CIR AT*6P0720 0720 — — 2×AT- 1 0 5
TCC SOLENOID/CIRC P0740 0740 — — 2×AT- 111
A/T TCC S/U FNCTN P0744 0744 — — 2×AT- 11 3
L/PRESS SOL/CIRC P0745 0745 — — 2×AT- 11 5
P-N POS SW/CIRCUIT P0850 0850 — — 2×EC-452
INTK TIM S/CIRC-B1 P1140 1140 — — 2×EC-457
INTK TIM S/CIRC-B2 P1145 1145 — — 2×EC-457
CLOSED LOOP-B1 P1148 1148 — — 1×EC-466
CLOSED LOOP-B2 P1168 1168 — — 1×EC-466
TCS C/U FUNCTN P1211 1211 — — 2 —EC-467
TCS/CIRC P1212 1212 — — 2 —EC-468
ENG OVER TEMP P1217 1217 — — 1×EC-469
CTP LEARNING P1225 1225 — — 2 —EC-477
CTP LEARNING P1226 1226 — — 2 —EC-479
COLD START CONTROL P1421 1421 — — 2×EC-481
BAT CURRENT SENSOR P1550 1550 — — 2 —EC-483
BAT CURRENT SENSOR P1551 1551 — — 2 —EC-489
BAT CURRENT SENSOR P1552 1552 — — 2 —EC-489
BAT CURRENT SENSOR P1553 1553 — — 2 —EC-495
BAT CURRENT SENSOR P1554 1554 — — 2 —EC-501
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTe s t v a l u e /
Test limit
(GST only)Trip MILRefer-
ence page CONSULT-II
GST*
2ECM*3

Page 1135 of 3061

INFINITI QX56 2007 Factory Service Manual EC-52
< SERVICE INFORMATION >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ASCD SW P1564 1564 — — 1 —EC-507

(Models
with ICC)
EC-513

(Models
with AS-
CD)
ICC COMMAND VALUE*
9P1568 1568 — — 1 —E

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INFINITI QX56 2007 Factory Service Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-53
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*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012.
*3: In Diagnostic

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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*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-II.
*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
DTC AND 1ST TRIP DTC
The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, 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 the ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL lights 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. For malfunctions that blink or light up the MIL during the
1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in "HOW TO
ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION".
For malfunctions in which 1st trip DTCs are displayed, refer to "EMISSION-RELATED DIAGNOSTIC INFOR-
MATION ITEMS". These items are required by legal regulations to continuously monitor the system/compo-
nent. In addition, the items monitored non-continuously are also displayed on CONSULT-II.
1st trip DTC is specified in Service $07 of SAE J1979. 1st trip DTC detection occurs without lighting up the MIL
and therefore does not warn the driver of a malfunction. However, 1st trip DTC detection will not prevent the
vehicle from being tested, for example during Inspection/Maintenance (I/M) tests.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in Work Flow procedure Step 2, refer to EC-82, "
Trouble Diagnosis Introduction". Then per-
form DTC Confirmation Procedure or Overall Function Check to try to duplicate the malfunction. If the mal-
function is duplicated, the item requires repair.
How to Read DTC and 1st Trip DTC
DTC and 1st trip DTC can be read by the following methods.
With CONSULT-II
With GST
CONSULT-II or GST (Generic Scan Tool) Examples: P0340, P0850, P1148, etc.
These DTCs are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)
No Tools
The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC.
Example: 0340, 0850, 1148, etc.
These DTCs are controlled by NISSAN.
•1st trip DTC No. is the same as DTC No.
•Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II do not indi-
cate whether the malfunction is still occurring or has occurred in the past and has returned to nor-
mal. CONSULT-II can identify malfunction status as shown below. Therefore, using CONSULT-II (if
available) is recommended.
A/F SENSOR1 (B1) P2A00 2A00 —×2×EC-588
A/F SENSOR1 (B2) P2A03 2A03 —×2×EC-588
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTe s t v a l u e /
Test limit
(GST only)Trip MILRefer-
ence page CONSULT-II
GST*
2ECM*3

Page 1137 of 3061

INFINITI QX56 2007 Factory Service Manual EC-54
< SERVICE INFORMATION >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunc-
tion is displayed in SELF-DIAGN

EC-54
< SERVICE INFORMATION >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunc-
tion is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-II. Time data indicates how many times
the vehicle was driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be [0].
If a 1st trip DTC is stored in the ECM, the time data will be [1t].
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem-
perature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base
fuel schedule and intake air temperature at the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For
details, see E C - 111 , "
CONSULT-II Function (ENGINE)".
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.
For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st
trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze
frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the
ECM memory.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem-
ory is erased. Procedures for clearing the ECM memory 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 & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-
ponents. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspection 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.
PBIB0911E
Priority Items
1Freeze frame data Misfire — DTC: P0300 - P0308
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2 Except the above items (Includes A/T related items)
3 1st trip freeze frame data

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