Signal Too High. Permanent Fault

Signal too high. Permanent fault

Checking the voltage








- Ignition off
- Disconnect the mass air flow (MAF) sensor connector
- Ignition on.
Connect a voltmeter between mass air flow (MAF) sensor connector terminal #2 (control module side) and ground.









The voltmeter should read 0 V.

OK - Checking the ground lead

Not OK - Checking wiring and terminals

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Checking the ground lead
Connect a voltmeter between mass air flow (MAF) sensor connector terminal #1 (engine control module (ECM) side) and ground.









The ohmmeter should read approximately 0 ohms.

OK - Defective mass air flow (MAF) sensor

Not OK - Checking wiring and terminals

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Defective mass air flow (MAF) sensor
Try a new mass air flow (MAF) sensor according to Replacing the mass air flow (MAF) sensor Removal and Replacement.

Continue - Verification

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Checking wiring and terminals
Check the cable between mass air flow (MAF) sensor connector terminal #1 (engine control module (ECM) side) and engine control module (ECM) terminal #15. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.













Continue - Verification

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Checking wiring and terminals
Check the cable between mass air flow (MAF) sensor connector terminal #2 (engine control module (ECM) side) and engine control module (ECM) terminal #15. Check for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.













Continue - Verification

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Verification








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Connect VCT2000
- Start the engine. Let the engine run until it reaches operating temperature.
Read off the MAF parameter.
The value should be 8-13 kg/h when idling. It should increase with throttle opening.





Is the value OK?

Yes - FAULT FOUND

No - No Fault Found Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the voltage

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