Checking Components And Wiring
Check the mass air flow (MAF) sensor connector. Check for contact resistance and oxidation.
Check for air leakage in the intake system and for damage to hoses etc.
Check the inside of the throttle body (TB). Check for contamination. When the throttle body (TB) is contaminated, the air flow to the engine is impaired and diagnostic trouble code (DTCs) or fault symptoms can occur.
Clean the throttle body (TB) if needed.
Check the power supply cable between system relay terminal #5 and mass air flow (MAF) sensor terminal #2. Check for an open-circuit.
Check the signal cable between engine control module (ECM) terminal #A22 (#A22) and mass air flow (MAF) sensor terminal #5. Check for a short-circuit to ground.
Check the power supply cable between engine control module (ECM) terminal #A39 (#A39) 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 at mass air flow (MAF) sensor terminal #2 must be approximately U bat.
Remedy as necessary.
Other information
- To connect the breakout box and access the control module, see CONNECTING THE BREAKOUT BOX
- see CHECKING FOR AIR LEAKAGE IN THE INTAKE SYSTEM
- For B5xx4T, see THROTTLE BODY (TB), CLEANING .
- For B6xx4x, see THROTTLE BODY (TB), CLEANING .
- see MASS AIR FLOW (MAF) SENSOR, REPLACING
- For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
- For 5 cylinder turbocharged engines 2005-, see SIGNAL SPECIFICATION .
- For 6 cylinder engines -2004, see SIGNAL SPECIFICATION
- For 6 cylinder engines 2005-, see SIGNAL SPECIFICATION .
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION