21/03/2013
IGAAdmin
Administrator
Posts: 245
Reputation: 5
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Driver Complaint – Severe lack of power, no warning lights displayed and no fault codes logged.
Cause/Symptom – When the mass air flow meter was unplugged the vehicle ran as normal.
Rectification Route – Carry out wiring checks first as follows-
Turn off ignition and disconnect connector from mass air meter, crank the engine and measure the voltage between terminal 2 and battery negative. It should be equal to battery voltage (12v) if not check wiring, relay/fuses. Measure the voltage between terminal 4 and battery negative. It should be 5volt if not check wiring.
Check wiring continuity from mass air connector back to the ECU as follows-
Remove the connectors from both the mass air meter and the ECU. Measure the resistance between terminals 1,3,4,5 and the corresponding terminals of the ECU connector. They should be <1 ohm. if not check the wiring.
In this case the wiring was o.k. and replacing the mass air flow meter rectified the concern.
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