Infiniti QX4 (R50). Manual — part 581
Diagnostic Procedure
NBTF0027
1
CHECK INPUT SIGNAL
WITHOUT CONSULT-II
©
GO TO 2.
2
CHECK INPUT SIGNAL
Without CONSULT-II
1. Turn ignition switch to “OFF” position.
2. Disconnect ABS control unit harness connector.
3. Disconnect ABS control unit and transfer control unit harness connectors.
4. Check continuity between transfer control unit harness connector terminal 32 and ABS control unit harness connector
terminal 13.
Continuity should exist.
5. Check continuity between transfer control unit harness connector terminal 32, ABS control unit harness connector ter-
minal 13 and body ground.
No continuity should exist.
SMT793DA
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace harness or connector between ABS control unit and transfer control
unit.
3
CHECK COMMUNICATION LINE
Check communication line between ABS control unit and transfer control unit.
(Refer to BR-77, “8. Vehicle vibrates excessively when ABS is operating”.)
OK or NG
OK
©
GO TO 4.
NG
©
Check, repair or replace faulty parts.
ABS OPERATION SIGNAL
Diagnostic Procedure
TF-86
4
PERFORM SELF-DIAGNOSIS AGAIN
After driving for a while, perform self-diagnosis again.
Refer to “Trouble Diagnosis without CONSULT-II”, TF-27.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform transfer control unit input/output signal inspection. Refer to “TRANSFER
CONTROL UNIT INSPECTION TABLE”, “TROUBLE DIAGNOSIS — GENERAL
DESCRIPTION”, TF-55.
2. If NG, recheck transfer control unit pin terminals for damage or loose connection with
harness connector.
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ABS OPERATION SIGNAL
Diagnostic Procedure (Cont’d)
TF-87
Diagnostic Procedure
NBTF0028
1
CHECK TRANSFER CONTROL UNIT POWER SOURCE
1. Turn ignition switch to “OFF” position and perform self-diagnosis again.
Refer to “Trouble Diagnosis without CONSULT-II”, TF-27 and “Trouble Diagnosis with CONSULT-II”, TF-30.
2. Turn ignition switch to “OFF” position.
3. Disconnect transfer control unit harness connector.
4. Check voltage between transfer control unit harness connector terminal 47 and body ground.
Voltage: Battery voltage
SMT794D
OK or NG
OK
©
GO TO 2.
NG
©
Check the following.
I
No. 24 fuse (7.5A)
I
Harness continuity between fuse and transfer control unit
2
PERFORM SELF-DIAGNOSIS AGAIN
After driving for a while, perform self-diagnosis again.
Refer to “Trouble Diagnosis without CONSULT-II”, TF-27 and “Trouble Diagnosis with CONSULT-II”, TF-30.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform transfer control unit input/output signal inspection. Refer to “TRANSFER
CONTROL UNIT INSPECTION TABLE”, “TROUBLE DIAGNOSIS — GENERAL
DESCRIPTION”, TF-55.
2. If NG, recheck transfer control unit pin terminals for damage or loose connection with
harness connector.
DATA ERASE/DISPLAY
Diagnostic Procedure
TF-88
Diagnostic Procedure
NBTF0064
1
SHIFT ACTUATOR
Refer to “Actuator & Actuator Position Switch”, “COMPONENT INSPECTION”, TF-115.
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
CHECK POWER SOURCE
SMT825DA
1. Disconnect transfer control device terminal.
2. Turn ignition switch to “ON”. (Do not start engine.)
3. Check voltage between transfer control device harness connector 3 (or 4) and body ground while 4WD shift switch is
set from 4H to 4LO (or from 4LO to 4H).
Voltage: Battery voltage
OK or NG
OK
©
Repair or replace actuator.
NG
©
1. Recheck the following.
I
Continuity between ignition switch and transfer HI & LOW relays
I
Ignition switch and No. 3 fuse (20A)
I
Continuity between transfer shift HI & LOW relays and transfer control device
2. If NG, repair or replace damaged part.
3
CHECK INPUT SIGNAL
WITH CONSULT-II
©
GO TO 4.
WITHOUT CONSULT-II
©
GO TO 5.
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SHIFT ACTUATOR
Diagnostic Procedure
TF-89
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