Infiniti QX4 (R50). Manual — part 578
4
CHECK INPUT SIGNAL
SMT784D
With CONSULT-II
1. Start engine.
2. Select “ECU INPUT SIGNALS” in Data Monitor.
3. Read out the value of “FLUID TEMP SE”.
Voltage:
20°C (68°F): Approx. 1.5V
80°C (176°F): Approx. 0.5V
SMT974D
OK or NG
OK
©
GO TO 6.
NG
©
Check the following.
I
Continuity between transfer control unit and transfer terminal cord assembly sub-har-
ness connector
TRANSFER FLUID TEMPERATURE SENSOR
Diagnostic Procedure (Cont’d)
TF-74
5
CHECK INPUT SIGNAL
Without CONSULT-II
1. Turn ignition switch to “ON” position.
2. Check voltage between transfer control unit harness connector terminals 28 and 31.
Voltage:
20°C (68°F): Approx. 1.5V
80°C (176°F): Approx. 0.5V
SMT785D
OK or NG
OK
©
GO TO 6.
NG
©
Check the following.
I
Continuity between transfer control unit and transfer terminal cord assembly sub-har-
ness connector
6
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
TRANSFER FLUID TEMPERATURE SENSOR
Diagnostic Procedure (Cont’d)
TF-75
Diagnostic Procedure
NBTF0024
1
CHECK ATP SWITCH, WAIT DETECTION SWITCH AND NEUTRAL-4LO SWITCH
SMT786D
Refer to “ATP Switch, Neutral-4LO Switch and Wait Detection Switch”, “COMPONENT INSPECTION”, TF-112.
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
CHECK CONTINUITY OF TRANSFER SUB-HARNESS
Check the following.
I
Continuity of transfer sub-harness
Refer to “TRANSFER SWITCH ASSEMBLY SUB-HARNESS CONNECTOR”, “COMPONENT INSPECTION”, TF-114.
OK or NG
OK
©
Repair or replace ATP switch, wait detection switch or neutral-4LO switch.
NG
©
Repair or replace transfer sub-harness.
3
CHECK INPUT SIGNAL
WITH CONSULT-II
©
GO TO 4.
WITHOUT CONSULT-II
©
GO TO 5.
ATP SWITCH, WAIT DETECTION SWITCH AND NEUTRAL-4LO SWITCH
Diagnostic Procedure
TF-76
4
CHECK INPUT SIGNAL
With CONSULT-II
1. Select “ECU INPUT SIGNALS” in Data Monitor.
2. Read out the ON/OFF status of “ATP SW”, “NEUTRAL SW” and “WAIT DETCT SW”.
SMT976D
OK or NG
OK
©
GO TO 6.
NG
©
Check the following.
I
Harness continuity between transfer switch assembly sub-harness connector and
transfer control unit
I
Continuity between transfer switch assembly sub-harness connector and body ground
GI
MA
EM
LC
EC
FE
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ATP SWITCH, WAIT DETECTION SWITCH AND NEUTRAL-4LO SWITCH
Diagnostic Procedure (Cont’d)
TF-77
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