Page 2361 of 3419
![INFINITI QX4 2005 Factory Service Manual LAN-82
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
ECM Circuit CheckUKS001NB
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check followi INFINITI QX4 2005 Factory Service Manual LAN-82
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
ECM Circuit CheckUKS001NB
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check followi](/manual-img/42/57035/w960_57035-2360.png)
LAN-82
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
ECM Circuit CheckUKS001NB
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 (control module side
and harness side).
–ECM connector
–Harness connector E19
–Harness connector F33
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ECM connector.
2. Check resistance between ECM harness connector E16 termi-
nals 94 (L) and 86 (P).
OK or NG
OK >> Replace ECM.
NG >> Repair harness between ECM and A/T assembly.
TCM Circuit CheckUKS001NC
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of A/T assembly for damage, bend and loose connection (control module
side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect A/T assembly connector.
2. Check resistance between A/T assembly harness connector F9
terminals 3 (L) and 8 (P).
OK or NG
OK >> Replace control valve with TCM.
NG >> Repair harness between A/T assembly and harness
connector F33. 94 (L) - 86 (P) : Approx. 108 - 132 Ω
PKIA0816E
3 (L) - 8 (P) : Approx. 54 - 66 Ω
SKIA6866E
Page 2362 of 3419
![INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
LAN-83
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ICC Sensor Circuit CheckUKS001PQ
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
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ICC Sensor Circuit CheckUKS001PQ
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative](/manual-img/42/57035/w960_57035-2361.png)
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ICC Sensor Circuit CheckUKS001PQ
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of ICC 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 ICC sensor connector.
2. Check resistance between ICC sensor harness connector E42
terminals 2 (L) and 3 (P).
OK or NG
OK >> Replace ICC sensor.
NG >> Repair harness between ICC sensor and harness con-
nector E34.
ICC Unit Circuit CheckUKS001PR
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of ICC unit for damage, bend and loose connection (control unit side and
harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ICC unit connector.
2. Check resistance between ICC unit harness connector B13 ter-
minals 14 (L) and 5 (P).
OK or NG
OK >> Replace ICC unit.
NG >> Repair harness between ICC unit and harness connec-
tor B69. 2 (L) - 3 (P) : Approx. 54 - 66 Ω
PKIA8172E
14 (L) - 5 (P) : Approx. 54 - 66 Ω
SKIA6886E
Page 2363 of 3419
![INFINITI QX4 2005 Factory Service Manual LAN-84
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Driver Seat Control Unit Circuit CheckUKS001ND
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery termi INFINITI QX4 2005 Factory Service Manual LAN-84
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Driver Seat Control Unit Circuit CheckUKS001ND
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery termi](/manual-img/42/57035/w960_57035-2362.png)
LAN-84
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Driver Seat Control Unit Circuit CheckUKS001ND
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 (control unit side and
harness side).
–Driver seat control unit connector
–Harness connector P1
–Harness connector B37
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect driver seat control unit connector.
2. Check resistance between driver seat control unit harness con-
nector P2 terminals 3 (L) and 19 (P).
OK or NG
OK >> Replace driver seat control unit.
NG >> Repair harness between driver seat control unit and har-
ness connector B69.
Combination Meter Circuit CheckUKS001NE
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of combination meter for damage, bend and loose connection (meter side
and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect combination meter connector.
2. Check resistance between combination meter harness connec-
tor M24 terminals 11 (L) and 12 (P).
OK or NG
OK >> Replace combination meter.
NG >> Repair harness between combination meter and data
link connector. 3 (L) - 19 (P) : Approx. 54 - 66 Ω
PKIA6842E
11 (L) - 12 (P) : Approx. 54 - 66 Ω
PKIA6837E
Page 2364 of 3419
![INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
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Display Control Unit Circuit CheckUKS001NF
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
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Display Control Unit Circuit CheckUKS001NF
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the](/manual-img/42/57035/w960_57035-2363.png)
CAN SYSTEM (TYPE 2)
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Display Control Unit Circuit CheckUKS001NF
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of display control unit for damage, bend and loose connection (control unit
side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect display control unit connector.
2. Check resistance between display control unit harness connec-
tor M95 terminals 25 (L) and 26 (P).
OK or NG
OK >> Replace display control unit.
NG >> Repair harness between display control unit and data
link connector.
BCM Circuit CheckUKS001NG
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of BCM for damage, bend and loose connection (control module side and
harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect BCM connector.
2. Check resistance between BCM harness connector M18 termi-
nals 39 (L) and 40 (P).
OK or NG
OK >> Replace BCM. Refer to BCS-20, "Removal and Installa-
tion of BCM" .
NG >> Repair harness between BCM and data link connector.25 (L) - 26 (P) : Approx. 54 - 66 Ω
SKIA6884E
39 (L) - 40 (P) : Approx. 54 - 66 Ω
SKIA6869E
Page 2365 of 3419
![INFINITI QX4 2005 Factory Service Manual LAN-86
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Data Link Connector Circuit CheckUKS001NH
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
INFINITI QX4 2005 Factory Service Manual LAN-86
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Data Link Connector Circuit CheckUKS001NH
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.](/manual-img/42/57035/w960_57035-2364.png)
LAN-86
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
Data Link Connector Circuit CheckUKS001NH
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of data link connector for damage, bend and loose connection (connector
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-55, "Work Flow" .
NG >> Repair harness between data link connector and combi-
nation meter.
Steering Angle Sensor Circuit CheckUKS001NI
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
Page 2366 of 3419
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Front Air Control Circuit CheckUKS001NJ
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the ne INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
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Front Air Control Circuit CheckUKS001NJ
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the ne](/manual-img/42/57035/w960_57035-2365.png)
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Front Air Control Circuit CheckUKS001NJ
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of front air control for damage, bend and loose connection (unit side and
harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect front air control connector.
2. Check resistance between front air control harness connector
M50 terminals 34 (L) and 35 (P).
OK or NG
OK >> Replace front air control.
NG >> Repair harness between front air control and data link
connector.
ABS Actuator and Electric Unit (Control Unit) Circuit CheckUKS001NK
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of ABS actuator and electric unit (control unit) for damage, bend and loose
connection (control unit side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect ABS actuator and electric unit (control unit) connector.
2. Check resistance between ABS actuator and electric unit (con-
trol unit) harness connector E125 terminals 11 (L) and 15 (P).
OK or NG
OK >> Replace ABS actuator and electric unit (control unit).
NG >> Repair harness between ABS actuator and electric unit
(control unit) and harness connector E152. 34 (L) - 35 (P) : Approx. 54 - 66 Ω
PKIA8136E
11 (L) - 15 (P) : Approx. 54 - 66 Ω
SKIA6872E
Page 2367 of 3419
![INFINITI QX4 2005 Factory Service Manual LAN-88
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
IPDM E/R Circuit CheckUKS001NL
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check te INFINITI QX4 2005 Factory Service Manual LAN-88
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
IPDM E/R Circuit CheckUKS001NL
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check te](/manual-img/42/57035/w960_57035-2366.png)
LAN-88
[CAN]
CAN SYSTEM (TYPE 2)
Revision: October 20052005 QX56
IPDM E/R Circuit CheckUKS001NL
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check terminals and connector of IPDM E/R for damage, bend and loose connection (control module side
and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect IPDM E/R connector.
2. Check resistance between IPDM E/R harness connector E122
terminals 39 (L) and 40 (P).
OK or NG
OK >> Replace IPDM E/R.
NG >> Repair harness between IPDM E/R and harness con-
nector E152.
CAN Communication Circuit CheckUKS001NM
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
–ICC sensor
–ICC unit
–Driver seat control unit
–Combination meter
–Display control unit
–BCM
–Steering angle sensor
–Front air control
–ABS actuator and electric unit (control unit)
–IPDM E/R
OK or NG
OK >> GO TO 2.
NG >> Repair or replace as necessary.39 (L) - 40 (P) : Approx. 108 - 132 Ω
PKIA8141E
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![INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
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2. CHECK HARNESS FOR SHORT CIRCUIT
With all module and control unit connectors disconnected, check
continuit INFINITI QX4 2005 Factory Service Manual CAN SYSTEM (TYPE 2)
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2. CHECK HARNESS FOR SHORT CIRCUIT
With all module and control unit connectors disconnected, check
continuit](/manual-img/42/57035/w960_57035-2367.png)
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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-89, "ECM/
IPDM E/R INTERNAL CIRCUIT INSPECTION" .
NG >> Repair harness.
IPDM E/R Ignition Relay Circuit CheckUKS001NN
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" .
Component InspectionUKS001NO
ECM/IPDM E/R INTERNAL CIRCUIT INSPECTION
Remove ECM and IPDM E/R from vehicle.
Check resistance between ECM terminals 94 and 86.
Check resistance between IPDM E/R terminals 39 and 40.6 (L) - 14 (P) : Continuity should not exist.
PKIA2077E
6 (L) - Ground : Continuity should not exist.
14 (P) - Ground : Continuity should not exist.
PKIA2079E
Unit TerminalResistance value (Ω)
(Approx.)
ECM 94 - 86
108 - 132
IPDM E/R 39 - 40
LKIA0037E