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9 CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM relay.
AEC927A
2. Check voltage between terminals 2, 5 and ground with CONSULT-II or tester.
SEF625W
Voltage: Battery voltage
OK or NG
OK 䊳 GO TO 11.
NG 䊳 GO TO 10.
10 DETECT MALFUNCTIONING PART
Check the following.
쐌 Harness for open or short between ECM relay and harness connector F27
䊳 Repair open circuit or short to ground or short to power in harness or connectors.
11 CHECK ECM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 4 and ECM relay terminal 1.
Refer to WIRING DIAGRAM.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK 䊳 GO TO 12.
NG 䊳 Repair open circuit or short to ground or short to power in harness or connectors.
12 CHECK HARNESS CONTINUITY BETWEEN ECM RELAY AND ECM FOR OPEN AND SHORT
1. Check harness continuity between ECM terminals 67, 72, 117 and ECM relay terminal 3.
Refer to WIRING DIAGRAM.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OK 䊳 GO TO 13.
NG 䊳 Repair open circuit or short to ground or short to power in harness or connectors.
TROUBLE DIAGNOSIS FOR POWER SUPPLY
VG33E
Main Power Supply and Ground Circuit (Cont’d)
EC-737
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
GI
MA
EM
LC
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