Infiniti QX4 (R50). Manual — part 583
Diagnostic Procedure
NBTF0066
1
SHIFT ACTUATOR CIRCUIT
Refer to “Transfer Shift Relay (High & Low)”, “COMPONENT INSPECTION” and “Actuator & Actuator Position Switch”,
“COMPONENT INSPECTION”, TF-114, 115.
OK or NG
OK
©
GO TO 2.
NG
©
Repair or replace transfer shift relay and actuator and actuator position switch.
2
CHECK POWER SOURCE OF TRANSFER SHIFT (HI & LOW) RELAY
SMT825DA
1. Disconnect transfer control device terminal.
2. Turn ignition switch to “ON” (Do not start engine).
3. Check voltage between transfer shift HI and LOW relay terminal 5 and body ground.
Voltage: Battery voltage
SMT831D
OK or NG
OK
©
GO TO 3.
NG
©
Check the following.
I
Continuity between ignition switch and transfer shift HI & LOW relays
I
Check ground circuit between transfer shift HI & LOW relays and body ground.
I
Ignition switch and No. 3 fuse (20A)
SHIFT ACTUATOR CIRCUIT
Diagnostic Procedure
TF-94
3
CHECK POWER SOURCE OF TRANSFER CONTROL DEVICE
1. Disconnect transfer control device terminal.
2. Turn ignition switch to “ON”. (Do not start engine.)
3. Turn 4WD shift switch from “4H” to “4LO” (or from “4LO” to “4H”).
4. Check voltage between transfer control device terminal 3 (or 4) and body ground.
Voltage: Battery voltage
SMT832D
OK or NG
OK
©
GO TO 4.
NG
©
Check the following.
I
Harness and connector from transfer shift HI and LOW relays to transfer control
device harness terminal
I
Ground circuit between transfer control device and body ground.
4
CHECK INPUT SIGNAL
WITH CONSULT-II
©
GO TO 5.
WITHOUT CONSULT-II
©
GO TO 6.
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SHIFT ACTUATOR CIRCUIT
Diagnostic Procedure (Cont’d)
TF-95
5
CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine (idling).
2. Select “SELF-DIAG RESULTS” in Select Diag Mode.
3. Read out self-diagnostic result.
SMT835D
SMT978D
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
SHIFT ACTUATOR CIRCUIT
Diagnostic Procedure (Cont’d)
TF-96
6
CHECK INPUT SIGNAL
Without CONSULT-II
1. Start engine (idling).
2. Check voltage between transfer control unit harness connector terminal 4 (or 13) and body ground while 4WD shift
switch is set from 4H to 4LO (or from 4LO to 4H).
SMT836D
3. Result
MTBL0516
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
7
CHECK HARNESS CONTINUITY BETWEEN TRANSFER CONTROL UNIT AND TRANSFER CONTROL
DEVICE
OK or NG
OK
©
GO TO 8.
NG
©
Repair and replace harness connector between transfer control unit and transfer control
device.
8
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/output signal inspection. Refer to “TRANSFER CON-
TROL 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
SHIFT ACTUATOR CIRCUIT
Diagnostic Procedure (Cont’d)
TF-97
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