Flow Too Low

Flow too low

Checking the component and wiring
Check the mass air flow (MAF) sensor connector. Check for contact resistance and oxidation.
Check the intake system for leakage.
Check the power cable between the system relay and mass air flow (MAF) sensor terminal #2. Check for an open-circuit.
Check the signal cable between engine control module (ECM) terminal #A63 (#B3) and mass air flow (MAF) sensor terminal #5. Check for an open-circuit. Check for a short-circuit to ground.
Check the power cable between engine control module (ECM) terminal #A18 (#A18) and mass air flow (MAF) sensor terminal #4. Check for an open-circuit.

Hint: With the ignition on and the mass air flow (MAF) sensor connector connected, the voltage between mass air flow (MAF) sensor terminal #2 and ground must be approximately Ubat.

Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- The air flow reading from the mass air flow (MAF) sensor may vary by between 12-20 kg/h at idle speed, depending on the engine load and temperature. The value may be in excess of 20 kg/h if the engine is cold
- Air leaks in the intake system, checking Air Leaks In the Intake System, Checking
- Mass air flow (MAF) sensor, B5254T7 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Check that the value for the air flow is correct. The value must be approximately 0 kg/h with the engine switched off
- Start the engine. Read off the air flow. The value can vary between 12-20 kg/h at idle speed, depending on the engine temperature and load. The flow can be more than 20 kg/h for a cold engine
- Increase the engine speed (RPM). Check that the air flow increases with increased engine speed.





Is the value correct?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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 component and wiring

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