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 U bat.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- see 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
- see AIR LEAKS IN THE INTAKE SYSTEM, CHECKING
- see MASS AIR FLOW (MAF) SENSOR
- see CONTENTS
- Continue
Refer to VERIFICATION