INFINITI QX56 2004 Factory Service Manual

EC-10Revision: August 2007
INDEX FOR DTC
2004 QX56
FUEL SYS-RICH-B1 P0172 0172 2×EC-217
FUEL SYS-RICH-B2 P0175 0175 2×EC-217
HLR/C SOL FNCTN P1769 1769 1×AT-166
HLR/C SOL/CIRC P1767 1767 1×AT-163
HO2S2 (B1) P0138 0138 2×EC-186
HO2S2 (B1) P0139 0139 2×EC-196
HO2S2 (B1) P1146 1146 2×EC-383
HO2S2 (B1) P1147 1147 2×EC-395
HO2S2 (B2) P0158 0158 2×EC-186
HO2S2 (B2) P0159 0159 2×EC-196
HO2S2 (B2) P1166 1166 2×EC-383
HO2S2 (B2) P1167 1167 2×EC-395
HO2S2 HTR (B1) P0037 0037 2×EC-138
HO2S2 HTR (B1) P0038 0038 2×EC-138
HO2S2 HTR (B2) P0057 0057 2×EC-138
HO2S2 HTR (B2) P0058 0058 2×EC-138
I/C SOLENOID/CIRC P1752 1752 1×AT-145
I/C SOLENOID FNCTN P1754 1754 1×AT-148
IAT SEN/CIRCUIT P0112 0112 2×EC-161
IAT SEN/CIRCUIT P0113 0113 2×EC-161
IAT SENSOR P0127 0127 2×EC-181
ISC SYSTEM P0506 0506 2×EC-342
ISC SYSTEM P0507 0507 2×EC-344
KNOCK SEN/CIRC-B1 P0327 0327 2 —EC-250
KNOCK SEN/CIRC-B1 P0328 0328 2 —EC-250
KNOCK SEN/CIRC-B2 P0332 0332 2 —EC-250
KNOCK SEN/CIRC-B2 P0333 0333 2 —EC-250
L/PRESS SOL/CIRC P0745 0745 2×AT-124
LC/B SOLENOID FNCT P1774 1774 1×AT-172
LC/B SOLENOID/CIRC P1772 1772 1×AT-169
MAF SEN/CIRCUIT P0101 0101 1×EC-146
MAF SEN/CIRCUIT P0102 0102 1×EC-154
MAF SEN/CIRCUIT P0103 0103 1×EC-154
MULTI CYL MISFIRE P0300 0300 2×EC-243
NATS MALFUNCTION P1610 - P1615 1610 - 1615 2 —BL-138
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000———
P-N POS SW/CIRCUIT P1706 1706 2×EC-546
PNP SW/CIRC P0705 0705 2×AT-109
PURG VOLUME CONT/V P0444 0444 2×EC-285
PURG VOLUME CONT/V P0445 0445 2×EC-285
PURG VOLUME CONT/V P1444 1444 2×EC-496
Items
(CONSULT-II screen terms)DTC*
1
TripMIL lighting
upReference page
CONSULT-II
GST*
2ECM*3

INDEX FOR DTC
EC-11
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56
*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: The troubleshooting for this DTC needs CONSULT-II.
*5: When the fail-safe operations for both self-diagnoses occur at the same time, the MIL illuminates.
*6: 2WD models
*7: Models with ICC systemPW ST P SEN/CIRC P0550 0550 2 —EC-346
SENSOR POWER/CIRC P1229 1229 1×EC-424
TCC SOLENOID/CIRC P0740 0740 2×AT - 11 8
TCM P0700 0700 1×AT- 1 0 8
TCS C/U FUNCTN P1211 1211 2 —EC-408
TCS/CIRC P1212 1212 2 —EC-409
THERMSTAT FNCTN P0128 0128 2×EC-184
TP SEN 1/CIRC P0222 0222 1×EC-236
TP SEN 1/CIRC P0223 0223 1×EC-236
TP SEN 2/CIRC P0122 0122 1×EC-171
TP SEN 2/CIRC P0123 0123 1×EC-171
TP SENSOR P2135 2135 1×EC-569
TURBINE REV S/CIRC P1716 1716 2×AT- 1 3 4
TW CATALYST SYS-B1 P0420 0420 2×EC-267
TW CATALYST SYS-B2 P0430 0430 2×EC-267
VEH SPD SEN/CIR AT*5P0720 0720 2×AT - 11 2
VEH SPEED SEN/CIRC*5P0500 0500 2×EC-340
VENT CONTROL VALVE P0447 0447 2×EC-292
VENT CONTROL VALVE P1446 1446 2×EC-504
Items
(CONSULT-II screen terms)DTC*
1
TripMIL lighting
upReference page
CONSULT-II
GST*
2ECM*3

EC-12Revision: August 2007
INDEX FOR DTC
2004 QX56
DTC No. IndexUBS00GZ4
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-135, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
×:Applicable —: Not applicable
DTC*
1
Items
(CONSULT-II screen terms)TripMIL lighting
upReference page
CONSULT-II
GST*
2ECM*3
U1000
1000*4CAN COMM CIRCUIT 1×EC-135
U1001
1001*4CAN COMM CIRCUIT 2 —EC-135
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.———
P0037 0037 HO2S2 HTR (B1) 2×EC-138
P0038 0038 HO2S2 HTR (B1) 2×EC-138
P0057 0057 HO2S2 HTR (B2) 2×EC-138
P0058 0058 HO2S2 HTR (B2) 2×EC-138
P0101 0101 MAF SEN/CIRCUIT 1×EC-146
P0102 0102 MAF SEN/CIRCUIT 1×EC-154
P0103 0103 MAF SEN/CIRCUIT 1×EC-154
P 0 11 2 0 11 2 I AT S E N /C I R C U I T 2×EC-161
P 0 11 3 0 11 3 I AT S E N /C I R C U I T 2×EC-161
P0117 0117 ECT SEN/CIRCUIT 1×EC-165
P0118 0118 ECT SEN/CIRCUIT 1×EC-165
P0122 0122 TP SEN 2/CIRC 1×EC-171
P0123 0123 TP SEN 2/CIRC 1×EC-171
P0125 0125 ECT SENSOR 1×EC-178
P0127 0127 IAT SENSOR 2×EC-181
P0128 0128 THERMSTAT FNCTN 2×EC-184
P0138 0138 HO2S2 (B1) 2×EC-186
P0139 0139 HO2S2 (B1) 2×EC-196
P0158 0158 HO2S2 (B2) 2×EC-186
P0159 0159 HO2S2 (B2) 2×EC-196
P0171 0171 FUEL SYS-LEAN-B1 2×EC-208
P0172 0172 FUEL SYS-RICH-B1 2×EC-217
P0174 0174 FUEL SYS-LEAN-B2 2×EC-208
P0175 0175 FUEL SYS-RICH-B2 2×EC-217
P0181 0181 FTT SENSOR 2×EC-225
P0182 0182 FTT SEN/CIRCUIT 2×EC-231
P0183 0183 FTT SEN/CIRCUIT 2×EC-231
P0222 0222 TP SEN 1/CIRC 1×EC-236
P0223 0223 TP SEN 1/CIRC 1×EC-236
P0300 0300 MULTI CYL MISFIRE 2×EC-243
P0301 0301 CYL 1 MISFIRE 2×EC-243
P0302 0302 CYL 2 MISFIRE 2×EC-243
P0303 0303 CYL 3 MISFIRE 2×EC-243

INDEX FOR DTC
EC-13
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56P0304 0304 CYL 4 MISFIRE 2×EC-243
P0305 0305 CYL 5 MISFIRE 2×EC-243
P0306 0306 CYL 6 MISFIRE 2×EC-243
P0307 0307 CYL 7 MISFIRE 2×EC-243
P0308 0308 CYL 8 MISFIRE 2×EC-243
P0327 0327 KNOCK SEN/CIRC-B1 2 —EC-250
P0328 0328 KNOCK SEN/CIRC-B1 2 —EC-250
P0332 0332 KNOCK SEN/CIRC-B2 2 —EC-250
P0333 0333 KNOCK SEN/CIRC-B2 2 —EC-250
P0335 0335 CKP SEN/CIRCUIT 2×EC-255
P0340 0340 CMP SEN/CIRC-B1 2×EC-261
P0420 0420 TW CATALYST SYS-B1 2×EC-267
P0430 0430 TW CATALYST SYS-B2 2×EC-267
P0441 0441 EVAP PURG FLOW/MON 2×EC-271
P0442 0442 EVAP SMALL LEAK 2×EC-276
P0444 0444 PURG VOLUME CONT/V 2×EC-285
P0445 0445 PURG VOLUME CONT/V 2×EC-285
P0447 0447 VENT CONTROL VALVE 2×EC-292
P0451 0451 EVAP SYS PRES SEN 2×EC-299
P0452 0452 EVAP SYS PRES SEN 2×EC-302
P0453 0453 EVAP SYS PRES SEN 2×EC-308
P0455 0455 EVAP GROSS LEAK 2×EC-316
P0456 0456 EVAP VERY SML LEAK 2×EC-324
P0460 0460 FUEL LEV SEN SLOSH 2×EC-334
P0461 0461 FUEL LEVEL SENSOR 2×EC-336
P0462 0462 FUEL LEVL SEN/CIRC 2×EC-338
P0463 0463 FUEL LEVL SEN/CIRC 2×EC-338
P0500 0500
VEH SPEED SEN/CIRC*52×EC-340
P0506 0506 ISC SYSTEM 2×EC-342
P0507 0507 ISC SYSTEM 2×EC-344
P0550 0550 PW ST P SEN/CIRC 2 —EC-346
P0605 0605 ECM 1 or 2× or —EC-351
P0700 0700 TCM 1×AT- 1 0 8
P0705 0705 PNP SW/CIRC 2×AT- 1 0 9
P0710 0710 ATF TEMP SEN/CIRC 2×AT- 1 3 1
P0720 0720
VEH SPD SEN/CIR AT*52×AT - 11 2
P0740 0740 TCC SOLENOID/CIRC 2×AT - 11 8
P0744 0744 A/T TCC S/V FNCTN 2×AT- 1 2 1
P0745 0745 L/PRESS SOL/CIRC 2×AT- 1 2 4
P1031 1031 A/F SEN1 HTR (B1) 2×EC-354
P1032 1032 A/F SEN1 HTR (B1) 2×EC-354
P1051 1051 A/F SEN1 HTR (B2) 2×EC-354
DTC*1
Items
(CONSULT-II screen terms)TripMIL lighting
upReference page
CONSULT-II
GST*
2ECM*3

EC-14Revision: August 2007
INDEX FOR DTC
2004 QX56
P1052 1052 A/F SEN1 HTR (B2) 2×EC-354
P1065 1065 ECM BACK UP/CIRCUIT 2×EC-361
P1121 1121 ETC ACTR 1×EC-365
P1122 1122 ETC FUNCTION/CIRC 1×EC-367
P1124 1124 ETC MOT PWR 1×EC-373
P1126 1126 ETC MOT PWR 1×EC-373
P1128 1128 ETC MOT 1×EC-378
P1146 1146 HO2S2 (B1) 2×EC-383
P1147 1147 HO2S2 (B1) 2×EC-395
P1148 1148 CLOSED LOOP-B1 1×EC-407
P1166 1166 HO2S2 (B2) 2×EC-383
P1167 1167 HO2S2 (B2) 2×EC-395
P1168 1168 CLOSED LOOP-B2 1×EC-407
P1211 1211 TCS C/U FUNCTN 2 —EC-408
P1212 1212 TCS/CIRC 2 —EC-409
P1217 1217 ENG OVER TEMP 1×EC-410
P1225 1225 CTP LEARNING 2 —EC-420
P1226 1226 CTP LEARNING 2 —EC-422
P1229 1229 SENSOR POWER/CIRC 1×EC-424
P1271 1271 A/F SENSOR (B1) 2×EC-429
P1272 1272 A/F SENSOR (B1) 2×EC-437
P1273 1273 A/F SENSOR (B1) 2×EC-445
P1274 1274 A/F SENSOR (B1) 2×EC-454
P1276 1276 A/F SENSOR (B1) 2×EC-463
P1278 1278 A/F SENSOR (B1) 2×EC-472
P1279 1279 A/F SENSOR (B1) 2×EC-484
P1281 1281 A/F SENSOR (B2) 2×EC-429
P1282 1282 A/F SENSOR (B2) 2×EC-437
P1283 1283 A/F SENSOR (B2) 2×EC-445
P1284 1284 A/F SENSOR (B2) 2×EC-454
P1286 1286 A/F SENSOR (B2) 2×EC-463
P1288 1288 A/F SENSOR (B2) 2×EC-472
P1289 1289 A/F SENSOR (B2) 2×EC-484
P1444 1444 PURG VOLUME CONT/V 2×EC-496
P1446 1446 VENT CONTROL VALVE 2×EC-504
P1564 1564 ASCD SW 1 —EC-510, EC-517
P1568 1568
ACC COMMAND VALUE*71—EC-524
P1572 1572 ASCD BRAKE SW 1 —EC-525, EC-544
P1574 1574
ASCD VHL SPD SEN*61—EC-542, EC-517
P1610 - P1615 1610 - 1615 NATS MALFUNCTION 2 —BL-138
P1706 1706 P-N POS SW/CIRCUIT 2×EC-546
P1716 1716 TURBINE REV S/CIRC 2×AT-134
DTC*1
Items
(CONSULT-II screen terms)TripMIL lighting
upReference page
CONSULT-II
GST*
2ECM*3

INDEX FOR DTC
EC-15
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56
*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: The troubleshooting for this DTC needs CONSULT-II.
*5: When the fail-safe operations for both self-diagnoses occur at the same time, the MIL illuminates.
*6: 2WD models
*7: Models with ICC systemP1730 1730 A/T INTERLOCK 1×AT- 1 3 9
P1752 1752 I/C SOLENOID/CIRC 1×AT- 1 4 5
P1754 1754 I/C SOLENOID FNCTN 1×AT- 1 4 8
P1757 1757 FR/B SOLENOID/CIRC 1×AT- 1 5 1
P1759 1759 FR/B SOLENOID FNCT 1×AT- 1 5 4
P1762 1762 D/C SOLENOID/CIRC 1×AT- 1 5 7
P1764 1764 D/C SOLENOID FNCTN 1×AT- 1 6 0
P1767 1767 HLR/C SOL/CIRC 1×AT- 1 6 3
P1769 1769 HLR/C SOL FNCTN 1×AT- 1 6 6
P1772 1772 LC/B SOLENOID/CIRC 1×AT- 1 6 9
P1774 1774 LC/B SOLENOID FNCT 1×AT- 1 7 2
P1805 1805 BRAKE SW/CIRCUIT 2 —EC-551
P2122 2122 APP SEN 1/CIRC 1×EC-556
P2123 2123 APP SEN 1/CIRC 1×EC-556
P2127 2127 APP SEN 2/CIRC 1×EC-562
P2128 2128 APP SEN 2/CIRC 1×EC-562
P2135 2135 TP SENSOR 1×EC-569
P2138 2138 APP SENSOR 1×EC-576
DTC*1
Items
(CONSULT-II screen terms)TripMIL lighting
upReference page
CONSULT-II
GST*
2ECM*3

EC-16Revision: August 2007
PRECAUTIONS
2004 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
UBS00GZ5
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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WAR NIN G:

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 harnesses or
harness connectors.
On Board Diagnostic (OBD) System of Engine and A/TUBS00GZ6
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:

Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves,
etc. will cause the MIL to light up.

Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL 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 MIL 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 MIL to light up due to the malfunction of the EVAP system or 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.
PrecautionUBS00GZ7

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 cable. 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.
SEF 2 89 H

PRECAUTIONS
EC-17
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56

Do not disassemble ECM.

If a battery cable 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 in the fig-
ure.

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-96, "
ECM Terminals and Reference Value"
.

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).
PBIB11 64 E
BBIA0387E
PBIB0090E
MEF040D

EC-18Revision: August 2007
PRECAUTIONS
2004 QX56

After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Overall Function
Check should be a good result if the repair is completed.

When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.

Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.

B1 indicates the bank 1, B2 indicates the bank 2 as shown
in the figure.
SEF 2 17 U
SEF 3 48 N
PBIB11 44 E

PRECAUTIONS
EC-19
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56

Do not operate fuel pump when there is no fuel in lines.

Tighten fuel hose clamps to the specified torque.

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 DiagnosisUBS00GZ8
When you read wiring diagrams, refer to the following:

GI-15, "How to Read Wiring Diagrams"

PG-4, "POWER SUPPLY ROUTING CIRCUIT" for power distribution circuit
When you perform trouble diagnosis, refer to the following:

GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"

GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident"
BBIA0402E
SEF 7 09 Y
SEF 7 08 Y