2005 INFINITI QX4 sensor

CAN SYSTEM (TYPE 3)
LAN-121
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: October 20052005 QX56
Data Link Connector Circuit CheckUKS001A5
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check the terminals and connector of data link connector for damage, bend and loose connection (con-
nector side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
Check resistance between data link connector M22 terminals 6 (L)
and 14 (P).
OK or NG
OK >> Diagnose again. Refer to LAN-95, "Work Flow" .
NG >> Repair harness between data link connector and combi-
nation meter.
Steering Angle Sensor Circuit CheckUKS001A6
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of steering angle sensor for damage, bend and loose connection (sensor
side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect steering angle sensor connector.
2. Check resistance between steering angle sensor harness con-
nector M47 terminals 3 (L) and 4 (P).
OK or NG
OK >> Replace steering angle sensor.
NG >> Repair harness between steering angle sensor and data
link connector. 6 (L) - 14 (P) : Approx. 54 - 66 Ω
PKIA2077E
3 (L) - 4 (P) : Approx. 54 - 66 Ω
PKIA6838E

LAN-124
[CAN]
CAN SYSTEM (TYPE 3)
Revision: October 20052005 QX56
CAN Communication Circuit CheckUKS001AB
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Disconnect the following module and control unit connectors and check terminals for deformation, discon-
nection, looseness or damage.
–ECM
–A/T assembly
–Driver seat control unit
–Combination meter
–Display control unit
–BCM
–Steering angle sensor
–Front air control
–Transfer control unit
–ABS actuator and electric unit (control unit)
–IPDM E/R
OK or NG
OK >> GO TO 2.
NG >> Repair or replace as necessary.
2. CHECK HARNESS FOR SHORT CIRCUIT
With all module and control unit connectors disconnected, check
continuity between data link connector M22 terminals 6 (L) and 14
(P).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
3. CHECK HARNESS FOR SHORT CIRCUIT
Check continuity between data link connector M22 terminals 6 (L),
14 (P) and ground.
OK or NG
OK >> Check ECM and IPDM E/R. Refer to LAN-125, "ECM/
IPDM E/R INTERNAL CIRCUIT INSPECTION" .
NG >> Repair harness.
IPDM E/R Ignition Relay Circuit CheckUKS001AC
Check the following. If no malfunction is found, replace the IPDM E/R.

IPDM E/R power supply circuit. Refer to PG-26, "IPDM E/R Power/Ground Circuit Inspection" .

Ignition power supply circuit. Refer to PG-13, "IGNITION POWER SUPPLY — IGNITION SW. IN ON
AND/OR START" . 6 (L) - 14 (P) : Continuity should not exist.
PKIA2077E
6 (L) - Ground : Continuity should not exist.
14 (P) - Ground : Continuity should not exist.
PKIA2079E

LAN-136
[CAN]
CAN SYSTEM (TYPE 4)
Revision: October 20052005 QX56
CHECK SHEET RESULTS (EXAMPLE)
NOTE:
If “NG” is displayed on “INITIAL DIAG (Initial diagnosis)” or “CAN COMM” for the diagnosed control unit,
replace the control unit.
Case 1
Check harness between TCM and ICC sensor. Refer to LAN-156, "Circuit Check Between TCM and ICC Sen-
sor" .
SKIB3383E
PKIA8818E

CAN SYSTEM (TYPE 4)
LAN-137
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: October 20052005 QX56
Case 2
Check harness between ICC sensor and ICC unit. Refer to LAN-157, "Circuit Check Between ICC Sensor and
ICC Unit" .
SKIB3384E
PKIA8819E

CAN SYSTEM (TYPE 4)
LAN-143
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: October 20052005 QX56
Case 8
Check ICC sensor circuit. Refer to LAN-161, "ICC Sensor Circuit Check" .
SKIB3390E
PKIA8825E

LAN-150
[CAN]
CAN SYSTEM (TYPE 4)
Revision: October 20052005 QX56
Case 15
Check steering angle sensor circuit. Refer to LAN-164, "Steering Angle Sensor Circuit Check" .
SKIB3397E
PKIA8832E

LAN-156
[CAN]
CAN SYSTEM (TYPE 4)
Revision: October 20052005 QX56
Case 22
Check IPDM E/R ignition relay circuit continuously sticks “ON”. Refer to LAN-167, "IPDM E/R Ignition Relay
Circuit Check" .
Circuit Check Between TCM and ICC SensorUKS001NU
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check following terminals and connectors for damage, bend and loose connection (connector side and
harness side).
–Harness connector F33
–Harness connector E19
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect A/T assembly connector and harness connector F33.
2. Check continuity between A/T assembly harness connector F9
terminals 3 (L), 8 (P) and harness connector F33 terminals 12
(L), 11 (P).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
SKIB3404E
3 (L) - 12 (L) : Continuity should exist.
8 (P) - 11 (P) : Continuity should exist.
PKIA6831E

CAN SYSTEM (TYPE 4)
LAN-157
[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
Revision: October 20052005 QX56
3. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC sensor connector.
2. Check continuity between harness connector E19 terminals 12
(L), 11 (P) and ICC sensor connector E42 terminals 2 (L), 3 (P).
OK or NG
OK >> Connect all connectors and diagnose again. Refer to
LAN-131, "
Work Flow" .
NG >> Repair harness.
Circuit Check Between ICC Sensor and ICC UnitUKS001PS
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check following terminals and connectors for damage, bend and loose connection (connector side and
harness side).
–Harness connector E34
–Harness connector B40
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC sensor connector and harness connector E34.
2. Check continuity between ICC sensor connector E42 terminals
2 (L), 3 (P) and harness connector E34 terminals 24 (L), 23 (P).
OK or NG
OK >> GO TO 3.
NG >> Repair harness.
3. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC unit connector.
2. Check continuity between harness connector B40 terminals 24
(L), 23 (P) and ICC unit connector B13 terminals 14 (L), 5 (P).
OK or NG
OK >> Connect all the connectors and diagnose again. Refer to
LAN-131, "
Work Flow" .
NG >> Repair harness.12 (L) - 2 (L) : Continuity should exist.
11 (P) - 3 (P) : Continuity should exist.
PKIA8171E
2 (L) - 24 (L) : Continuity should exist.
3 (P) - 23 (P) : Continuity should exist.
PKIA8137E
24 (L) - 14 (L) : Continuity should exist.
23 (P) - 5 (P) : Continuity should exist.
PKIA8138E