Infiniti QX4 (R50). Manual — part 294
ECM Terminals and Reference Value
NBEC0690
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
52
PU
Electrical load signal
[Engine is running]
I
Rear window defogger: ON
I
Hi-beam headlamp: ON
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Electrical load: OFF
0V
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ELECTRICAL LOAD SIGNAL
ECM Terminals and Reference Value
EC-643
Wiring Diagram
NBEC0604
MEC421D
ELECTRICAL LOAD SIGNAL
Wiring Diagram
EC-644
Diagnostic Procedure
NBEC0605
1
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 52 and ground under the following conditions.
SEF610X
OK or NG
OK
©
GO TO 2.
NG
©
GO TO 3.
2
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Check voltage between ECM terminal 52 and ground under the following conditions.
SEF611X
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 7.
3
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 4.
No
©
Refer to EL-151, “Rear Window Defogger”.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ELECTRICAL LOAD SIGNAL
Diagnostic Procedure
EC-645
4
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 52 and rear window defogger relay terminals 7.
SEF031Z
5. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E1, M1
I
Harness connectors M33, F22
I
Diode M37
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.
6
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
7
CHECK HEADLAMP FUNCTION
1. Start engine.
2. Turn the lighting switch “ON” at 1st position with high beam.
3. Check that headlamps are illuminated.
OK or NG
OK
©
GO TO 8.
NG
©
Refer to EL-60, “HEADLAMP (FOR USA)” or EL-123, “HEADLAMP (FOR CANADA) —
DAYTIME LIGHT SYSTEM”.
ELECTRICAL LOAD SIGNAL
Diagnostic Procedure (Cont’d)
EC-646
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