2004 INFINITI QX56 Back up

DI-72
REAR VIEW MONITOR
Revision: August 20072004 QX56
REAR VIEW MONITORPFP:28260
System DescriptionEKS007R4

When the A/T selector is in the reverse position, the display shows view to the rear of the vehicle.

Lines which indicate the vehicle clearance and distances are displayed on the monitor.
POWER SUPPLY AND GROUND
Power is supplied at all times

through 20A fuse [No. 31, located in the fuse and fusible link box]

to rear view camera control unit terminal 1.
When ignition switch is in ACC or ON position, power is supplied

through 10A fuse [No. 4, located in the fuse block (J/B)]

to rear view camera control unit terminal 2.
Ground is supplied

to rear view camera control unit terminal 3 and

to rear view camera terminal 2

through grounds B7 and B19.
AV COMMUNICATION LINE
Rear view camera control unit is connected to the following units with AV communication line. Each unit trans-
mits/receives data with AV communication line.

NAVI control unit

Display unit

Display control unit

AV switch
REAR VIEW CAMERA OPERATION
When ignition switch is in ON or START position, power is supplied

through 10A fuse (No. 51, located in the IPDM E/R)

to back-up lamp relay terminals 1 and 3.
When A/T selector lever is in reverse position, power is supplied

through back-up lamp relay terminal 2

to TCM terminal 7.
Then, when back-up lamp relay is energized,

from back-up lamp relay terminal 5

to rear view camera control unit terminal 4.
Then, rear view camera control unit is sent camera ON signal

through rear view camera control unit terminal 8

to rear view camera terminal 1.
An image taken by rear view camera is sent

through rear view camera terminals 3 and 4

to rear view camera control unit terminals 10 and 9.
Then an image is sent

through rear view camera control unit terminals 11 and 12

to the display unit terminals 4 and 15.
An image of rear view will be projected on the display.
Side Distance Guideline
When A/T selector lever is in reverse position, rear view camera control unit is sent rear view camera guideline
image

through rear view camera control unit terminals 11 and 12

to the display unit terminals 4 and 15.

DI-84
REAR VIEW MONITOR
Revision: August 20072004 QX56
Rear View Is Not Displayed With The A/T Selector Lever In R PositionEKS007RC
1. BACK-UP LAMP INSPECTION
1. Turn ignition switch ON.
2. Shift A/T selector lever to R position.
Does back-up lamp illuminate?
YES >> GO TO 2.
NO >> Check back-up lamp system. Refer to LT-106, "
BACK-UP LAMP" .
2. CHECK REVERSE POSITION INPUT SIGNAL
With CONSULT-II
Select “DATA MONITOR” of “REARVIEW CAMERA”. Operate igni-
tion switch with “R POSI SIG” of “DATA MONITOR” and check oper-
ate status.
Without CONSULT-II
1. Turn ignition switch OFF.
2. Disconnect rear view camera control unit connector.
3. Turn ignition switch ON.
4. Shift A/T selector lever to R position.
5. Check voltage between rear view camera control unit harness
connector B73 terminal 4 (G/W) and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open or short between rear view
camera control unit and back-up lamp relay.
3. CHECK DISPLAY CONTROL UNIT OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect rear view camera control unit connector.
3. Turn ignition switch ON.
4. Check voltage between rear view camera control unit harness
connector B73 terminal 5 (BR) and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
SKIA7147E
Battery voltage should exist.
SKIA5086E
Voltage : Approx. 5V
SKIA7148E

DI-88
REAR VIEW MONITOR
Revision: August 20072004 QX56
13. CHECK REAR VIEW CAMERA CONTROL UNIT COMPOSITE SIGNAL
1. Connect rear view camera control unit connector and display
unit connector.
2. Turn ignition switch ON.
3. Check voltage signal between rear view camera control unit har-
ness connector B73 terminal 12 (W) and ground.
OK or NG
OK >> Replace the display unit. Refer to AV- 1 5 8 , "Removal and Installation of Display Unit" .
NG >> Replace the rear view camera control unit. Refer to DI-88, "
Removal and Installation of Rear View
Camera Control Unit" .
Removal and Installation of Rear View Camera Control UnitEKS007RE
REMOVAL
1. Remove luggage side finisher lower LH. Refer to EI-39, "LUG-
GAGE FLOOR TRIM" .
2. Remove screws (2), and remove rear view camera control unit.
INSTALLATION
Installation is in the reverse order of removal.
Removal and Installation of Rear View CameraEKS007RF
REMOVAL
1. Remove back door lower finisher. Refer to EI-41, "BACK DOOR TRIM" .
2. Remove connector.
3. Remove screws (2), and remove rear view camera.
INSTALLATION
Installation is in the reverse order of removal.12 (W) - Ground:
WKIA1827E
SKIA4896E
LKIA0478E
LKIA0479E

INDEX FOR DTC
EC-9
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56CMP SEN/CIRC-B1 P0340 0340 2×EC-261
CTP LEARNING P1225 1225 2 —EC-420
CTP LEARNING P1226 1226 2 —EC-422
CYL 1 MISFIRE P0301 0301 2×EC-243
CYL 2 MISFIRE P0302 0302 2×EC-243
CYL 3 MISFIRE P0303 0303 2×EC-243
CYL 4 MISFIRE P0304 0304 2×EC-243
CYL 5 MISFIRE P0305 0305 2×EC-243
CYL 6 MISFIRE P0306 0306 2×EC-243
CYL 7 MISFIRE P0307 0307 2×EC-243
CYL 8 MISFIRE P0308 0308 2×EC-243
D/C SOLENOID/CIRC P1762 1762 1×AT- 1 5 7
D/C SOLENOID FNCTN P1764 1764 1×AT- 1 6 0
ECM P0605 0605 1 or 2× or —EC-351
ECM BACK UP/CIRCUIT P1065 1065 2×EC-361
ECT SEN/CIRCUIT P0117 0117 1×EC-165
ECT SEN/CIRCUIT P0118 0118 1×EC-165
ECT SENSOR P0125 0125 1×EC-178
ENG OVER TEMP P1217 1217 1×EC-410
ETC ACTR P1121 1121 1×EC-365
ETC FUNCTION/CIRC P1122 1122 1×EC-367
E T C M O T P 11 2 8 11 2 8 1×EC-378
E T C M O T P W R P 11 2 4 11 2 4 1×EC-373
E T C M O T P W R P 11 2 6 11 2 6 1×EC-373
EVAP GROSS LEAK P0455 0455 2×EC-316
EVAP PURG FLOW/MON P0441 0441 2×EC-271
EVAP SMALL LEAK P0442 0442 2×EC-276
EVAP SYS PRES SEN P0451 0451 2×EC-299
EVAP SYS PRES SEN P0452 0452 2×EC-302
EVAP SYS PRES SEN P0453 0453 2×EC-308
EVAP VERY SML LEAK P0456 0456 2×EC-324
FR/B SOLENOID FNCT P1759 1759 1×AT- 1 5 4
FR/B SOLENOID/CIRC P1757 1757 1×AT- 1 5 1
FTT SEN/CIRCUIT P0182 0182 2×EC-231
FTT SEN/CIRCUIT P0183 0183 2×EC-231
FTT SENSOR P0181 0181 2×EC-225
FUEL LEV SEN SLOSH P0460 0460 2×EC-334
FUEL LEVEL SENSOR P0461 0461 2×EC-336
FUEL LEVL SEN/CIRC P0462 0462 2×EC-338
FUEL LEVL SEN/CIRC P0463 0463 2×EC-338
FUEL SYS-LEAN-B1 P0171 0171 2×EC-208
FUEL SYS-LEAN-B2 P0174 0174 2×EC-208
Items
(CONSULT-II screen terms)DTC*
1
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

ENGINE CONTROL SYSTEM
EC-27
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This system uses air
fuel ratio (A/F) sensor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The
ECM adjusts the injection pulse width according to the sensor voltage signal. For more information about air
fuel ratio (A/F) sensor 1, refer to EC-429
. This maintains the mixture ratio within the range of stoichiometric
(ideal air-fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching
characteristics of air fuel ratio (A/F) sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal
from heated oxygen sensor 2.
Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.

Deceleration and acceleration

High-load, high-speed operation

Malfunction of air fuel ratio (A/F) sensor 1 or its circuit

Insufficient activation of air fuel ratio (A/F) sensor 1 at low engine coolant temperature

High engine coolant temperature

During warm-up

After shifting from N to D

When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from A/F sensor 1.
This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoret-
ical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally
designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes dur-
ing operation (i.e., injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
“Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the-
oretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in
fuel volume if it is lean.
“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
SEF 5 03 YB

EC-52Revision: August 2007
ON BOARD DIAGNOSTIC (OBD) SYSTEM
2004 QX56
A/F SEN1 HTR (B2) P1051 1051×××EC-354
A/F SEN1 HTR (B2) P1052 1052×××EC-354
ECM BACK UP/CIRC P1065 1065 — —×EC-361
ETC ACTR P1121 1121 — — —EC-365
ETC FUNCTION/CIRC P1122 1122 — — —EC-367
E T C M O T P W R P 11 2 4 11 2 4 — — —EC-373
E T C M O T P W R P 11 2 6 11 2 6 — — —EC-373
E T C M O T P 11 2 8 11 2 8 — — —EC-378
HO2S2 (B1) P1146 1146×××EC-383
HO2S2 (B1) P1147 1147×××EC-395
CLOSED LOOP-B1 P1148 1148 — — —EC-407
HO2S2 (B2) P1166 1166×××EC-383
HO2S2 (B2) P1167 1167×××EC-395
CLOSED LOOP-B2 P1168 1168 — — —EC-407
TCS C/U FUNCTN P1211 1211 — —×EC-408
TCS/CIRC P1212 1212 — —×EC-409
ENG OVER TEMP P1217 1217 — — —EC-410
CTP LEARNING P1225 1225 — —×EC-420
CTP LEARNING P1226 1226 — —×EC-422
SENSOR POWER/CIRC P1229 1229 — — —EC-424
A/F SENSOR1 (B1) P1271 1271 — —×EC-429
A/F SENSOR1 (B1) P1272 1272 — —×EC-437
A/F SENSOR1 (B1) P1273 1273 — —×EC-445
A/F SENSOR1 (B1) P1274 1274 — —×EC-454
A/F SENSOR1 (B1) P1276 1276 — —×EC-463
A/F SENSOR1 (B1) P1278 1278×××EC-472
A/F SENSOR1 (B1) P1279 1279×××EC-484
A/F SENSOR1 (B2) P1281 1281 — —×EC-429
A/F SENSOR1 (B2) P1282 1282 — —×EC-437
A/F SENSOR1 (B2) P1283 1283 — —×EC-445
A/F SENSOR1 (B2) P1284 1284 — —× EC-454
A/F SENSOR1 (B2) P1286 1286 — —×EC-463
A/F SENSOR1 (B2) P1288 1288×××EC-472
A/F SENSOR1 (B2) P1289 1289×××EC-484
PURG VOLUME CONT/V P1444 1444 — —×EC-496
VENT CONTROL VALVE P1446 1446 — —×EC-504
ASCD SW P1564 1564 — — —EC-510,
EC-517
ACC COMMAND VALUE*8P1568 1568 — — —EC-524
ASCD BRAKE SW P1572 1572 — — —EC-525,
EC-534
ASCD VHL SPD SEN*7P1574 1574 — — —EC-542,
EC-534
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTest value/
Test limit
(GST only)1st trip DTCReference
page CONSULT-II
GST*
2ECM*3

EC-62Revision: August 2007
ON BOARD DIAGNOSTIC (OBD) SYSTEM
2004 QX56
HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION
How to Erase DTC
With CONSULT-II
The emission related diagnostic information in the ECM can be erased by selecting “ERASE” in the “SELF-
DIAG RESULTS” mode with CONSULT-II.
If DTCs are displayed for both ECM and TCM (Transmission control module), they need to be erased individu-
ally from the ECM and TCM (Transmission control module).
NOTE:
If the DTC is not for A/T related items (see EC-8
), skip steps 2 through 4.
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again.
2. Turn CONSULT-II ON and touch “A/T”.
3. Touch “SELF-DIAG RESULTS”.
4. Touch “ERASE”. [The DTC in the TCM (Transmission control module) will be erased.] Then touch “BACK”
twice.
5. Touch “ENGINE”.
6. Touch “SELF-DIAG RESULTS”.
7. Touch “ERASE”. (The DTC in the ECM will be erased.)
With GST
The emission related diagnostic information in the ECM can be erased by selecting MODE 4 with GST.
NOTE:
If the DTC is not for A/T related items (see EC-8
), skip step 2.
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again.
SCIA5334E