Nissan Silvia. Manual — part 142
Main Power Supply and Ground Circuit
WIRING DIAGRAM
NMEC0661
TEC798
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit
EC-83
ECM TERMINALS AND REFERENCE VALUE
NMEC0662
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)
4
R/B
ECM relay (Self shut-off)
[Engine is running]
[Ignition switch “OFF”]
I
For a few seconds after turning ignition switch
“OFF”
0 - 1V
[Ignition switch “OFF”]
I
A few seconds passed after turning ignition switch
“OFF”
BATTERY VOLTAGE
(11 - 14V)
6
13
B
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
36
B/R
Ignition switch
[Ignition switch “OFF”]
0V
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
38
47
B/W
B/W
Power supply for ECM
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
39
48
B
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
46
W
Power supply for ECM
(Back-up)
[Ignition switch “OFF”]
BATTERY VOLTAGE
(11 - 14V)
107
108
116
B
B
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
109
W
Current return
[Ignition switch “OFF”]
BATTERY VOLTAGE
(11 - 14V)
DIAGNOSTIC PROCEDURE
NMEC0663
1
INSPECTION START
Start engine.
Is engine running?
Yes or No
Yes
©
GO TO 8.
No
©
GO TO 2.
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit (Cont’d)
EC-84
2
CHECK ECM POWER SUPPLY CIRCUIT-I
1. Turn ignition switch “OFF” and then “ON”.
2. Check voltage between ECM terminal 36 and ground with CONSULT-II or tester.
SEC401C
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
3
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M60, F4
I
Fuse block (J/B) connector M7, E104
I
10A fuse
I
Harness for open or short between ECM and ignition switch
©
Repair harness or connectors.
4
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 6, 13, 39, 48, 107, 108, 116 and engine ground.
Refer to WIRING DIAGRAM.
Continuity should exist.
4. Also check harness for short to power.
OK or NG
OK
©
GO TO 5.
NG
©
Repair open circuit or short to power in harness or connectors.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit (Cont’d)
EC-85
5
CHECK POWER SUPPLY-II
1. Disconnect ECM relay.
SEC376C
2. Check voltage between ECM relay terminals 1, 7 and ground with CONSULT-II or tester.
SEC402C
OK or NG
OK
©
GO TO 7.
NG
©
GO TO 6.
6
DETECT MALFUNCTIONING PART
Check the following.
I
10A fuses
I
Harness connectors E101, M10
I
Harness connectors M60, F4
I
Harness for open or short between ECM relay and battery
©
Repair open circuit or short to ground or short to power in harness or connectors.
7
CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 4 and ECM relay terminal 2.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OK
©
Go to “DTC 0201 IGNITION SIGNAL”, EC-110.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
TROUBLE DIAGNOSIS FOR POWER SUPPLY
Main Power Supply and Ground Circuit (Cont’d)
EC-86
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