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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 P0133, P0153 HEATED OXYGEN SENSOR 1 (FRONT)
(BANK 1)/(BANK 2) (RESPONSE MONITORING)
VG33E
Diagnostic Procedure (Cont’d)
EC-816
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