Infiniti G20 (P11). Manual — part 304
Diagnostic Procedure
NCEC0642
1
INSPECTION START
Do you have CONSULT-II?
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 4.
2
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
With CONSULT-II
1. Turn ignition switch “ON”.
2. Check “LOAD SIGNAL” in “DATA MONITOR” mode with CONSULT-II under the following conditions.
SEF229Y
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 6.
3
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
With CONSULT-II
1. Turn ignition switch “ON”.
2. Check “LOAD SIGNAL” in “DATA MONITOR” mode with CONSULT-II under the following conditions.
SEF230Y
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 10.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ELECTRICAL LOAD SIGNAL
Diagnostic Procedure
EC-627
4
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
Without CONSULT-II
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 50 and ground under the following conditions.
SEF956X
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 6.
5
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Without CONSULT-II
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 50 and ground under the following conditions.
SEF957X
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 10.
6
CHECK REAR WINDOW DEFOGGER FUNCTION
1. Start engine.
2. Turn “ON” the rear window defogger switch.
3. Check the rear windshield. Is the rear windshield heated up?
Yes or No
Yes
©
GO TO 7.
No
©
Refer to EL-121, “Rear Window Defogger”.
ELECTRICAL LOAD SIGNAL
Diagnostic Procedure (Cont’d)
EC-628
7
CHECK REAR WINDOW DEFOGGER INPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect rear window defogger relay.
4. Check harness continuity between ECM terminal 50 and rear window defogger relay terminal 5.
SEF958X
5. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 9.
NG
©
GO TO 8.
8
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M49, F23
I
Harness connectors E75, M6
I
Diode M93
I
Diode M94
I
Harness for open and short between ECM and rear window defigger relay
©
Repair open circuit or short to ground or short to power in harness or connectors.
9
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-146.
©
INSPECTION END
10
CHECK HEADLAMP FUNCTION
1. Start engine.
2. Turn the lighting switch “ON” at 2nd position.
3. Check that headlamps are illuminated.
OK or NG
OK
©
GO TO 11.
NG
©
Refer to EL-29, “HEADLAMP (FOR USA)” or EL-41, “HEADLAMP (FOR CANADA) —
DAYTIME LIGHT SYSTEM”.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ELECTRICAL LOAD SIGNAL
Diagnostic Procedure (Cont’d)
EC-629
11
CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect lighting switch harness connectors.
4. Check harness continuity between ECM terminal 50 and lighting switch terminals 9, 10 under the following conditions.
SEF959X
5. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 13.
NG
©
GO TO 12.
12
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M49, F23
I
Harness connectors E75, M6
I
Diode M94
I
Harness for open and short between ECM and lighting switch
©
Repair open circuit or short to ground or short to power in harness or connectors.
13
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-146.
©
INSPECTION END
ELECTRICAL LOAD SIGNAL
Diagnostic Procedure (Cont’d)
EC-630
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