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7 CHECK MAFS INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between MAFS terminal 4 and ECM terminal 54.
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 8.
NG 䊳 Repair open circuit or short to ground or short to power in harness or connectors.
8 CHECK MASS AIR FLOW SENSOR
1. Reconnect harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 54 (Mass air flow sensor signal) and ground.
SEF747U
MTBL0227
4. If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it again.
Then repeat above check.
5. If NG, remove mass air flow sensor from air duct. Check hot wire for damage or dust.
SEF030T
OK or NG
OK 䊳 GO TO 9.
NG 䊳 Replace mass air flow sensor.
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
VG33E
Diagnostic Procedure (Cont’d)
EC-746
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