Infiniti QX4 (R50). Manual — part 55
MAT920A
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
Wiring Diagram — AT — NONDTC (Cont’d)
AT-217
1. O/D OFF Indicator Lamp Does Not Come On
NBAT0073
SYMPTOM:
O/D OFF indicator lamp does not come on for about 2 seconds
when turning ignition switch to “ON”.
1
CHECK TCM POWER SOURCE STEP 1
1. Turn ignition switch to ON position.
(Do not start engine.)
2. Check voltage between TCM terminals 10, 19, 28 and ground.
SAT611J
OK or NG
OK
©
GO TO 2.
NG
©
GO TO 3.
2
CHECK TCM POWER SOURCE STEP 2
1. Turn ignition switch to OFF position.
2. Check voltage between TCM terminal 28 and ground.
SAT612JC
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
3
DETECT MALFUNCTIONING ITEM
Check the following items:
I
Harness for short or open between ignition switch and TCM terminals 10, 19 and 28 (Main harness)
I
Ignition switch and 10A or 7.5A fuse [No. 18 or 24, located in the fuse block (J/B)]
Refer to EL-9, “Schematic”.
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
1. O/D OFF Indicator Lamp Does Not Come On
AT-218
4
CHECK TCM GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check continuity between TCM terminals 25, 48 and ground. Refer to wiring diagram — AT — MAIN.
Continuity should exist.
If OK, check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 5.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
5
CHECK LAMP CIRCUIT
1. Turn ignition switch to “ON” position.
2. Set overdrive control switch to “ON” position.
3. Check voltage between TCM terminals 13 and ground.
SAT529J
Does battery voltage exist?
Yes
©
GO TO 7.
No
©
GO TO 6.
6
CHECK MALFUNCTIONING ITEM
Check the following items:
I
Fuse
I
O/D OFF indicator lamp
I
Harness for short or open between ignition switch and O/D OFF indicator lamp (Main harness)
I
Refer to EL-9, “Schematic”.
I
Harness for short or open between O/D OFF indicator lamp and TCM
OK or NG
OK
©
GO TO 7.
NG
©
Repair or replace damaged parts.
7
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 8.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
1. O/D OFF Indicator Lamp Does Not Come On (Cont’d)
AT-219
8
CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
©
INSPECTION END
NG
©
Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
1. O/D OFF Indicator Lamp Does Not Come On (Cont’d)
AT-220
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