Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the connector




- Ignition off
- Disconnect the mass air flow (MAF) sensor connector.
Check the connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault. Remedy as necessary.





Was a fault detected?

Yes - Verification

No - Checking the power cable

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Checking the power cable




- Ignition off
- Mass air flow (MAF) sensor connector disconnected
- Ignition on.
Connect a voltmeter between mass air flow (MAF) sensor connector terminal #3 (control module side) and ground.









The voltmeter must display battery voltage for 2 seconds immediately after the ignition is switched on.

OK - Checking the signal cable

Not OK - Checking wiring and terminals

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Checking the signal cable




- Ignition off.
Check the cable between mass air flow (MAF) sensor connector terminal #2 (engine control module (ECM) side) and engine control module (ECM) terminal #16. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.













Was a fault detected?

Yes - Verification

No - Fault-tracing information

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Fault-tracing information





Checking intake system

Checking intake system
Check the intake system for air leakage according to intake system/leak test Intake System/Leak Test.

Was a fault detected?

Yes - FAULT FOUND

No - No Fault Found

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FAULT FOUND - Verification

No Fault Found - Defective mass air flow (MAF) sensor

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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 Service and Repair.

Select Continue.

Continue - Verification

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Checking wiring and terminals
Check the cable between mass air flow (MAF) sensor connector terminal #3 (engine control module (ECM) side) and system relay 2/14 base terminal #5 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.













Select Continue.

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 MAFH 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 FoundFault-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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the connector

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