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3 CHECK VACUUM CUT VALVE BYPASS VALUE POWER SUPPLY CIRCUIT
Without CONSULT-II
1. Turn ignition switch OFF.
2. Disconnect vacuum cut valve bypass valve harness connector.
SEF186S
3. Turn ignition switch ON.
4. Check voltage between terminal 1 and ground with CONSULT-II or tester.
SEF659W
Voltage: Battery voltage
OK or NG
OK 䊳 GO TO 5.
NG 䊳 GO TO 4.
4 DETECT MALFUNCTIONING PART
Check the following.
쐌 Harness connectors E74, M82
쐌 Harness connectors M67, B101 and B113, C3
쐌 Fuse block (J/B) connector E49
쐌 10A fuse
쐌 Harness for open or short between vacuum cut valve bypass valve and fuse
䊳 Repair harness or connectors.
5 CHECK VACUUM CUT VALVE BYPASS VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 120 and valve terminal 2. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK 䊳 GO TO 7.
NG 䊳 GO TO 6.
DTC P1490 VACUUM CUT VALVE BYPASS VALVE (CIRCUIT)
VG33E
Diagnostic Procedure (Cont’d)
EC-1139
GI
MA
EM
LC
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
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