Checking wiring and components
Check the Intake Air Temperature (IAT) sensor resistance between #1 and #3 on the Mass Air Flow (MAF) sensor. The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor.
The Intake Air Temperature (IAT) sensor can be defective if the signal cable has been short-circuited to supply voltage. Check this before replacing the sensor.
Check ground lead between control module #A5 (#A5) and Mass Air Flow (MAF) sensor connector #1 for an open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .
HINT: With the ignition on and the outside temperature sensor connector disconnected, the voltage between #1 and ground should be approximately 5 V.
Check ground lead between control module #A58 (#A58) and Mass Air Flow (MAF) sensor connector #3 for an open-circuit according to Open-circuit, permanent faults .
Remedy as necessary.
Other information
- Connecting the breakout box/accessing the control module, see Connecting the breakout box .
- To access/replace the Mass Air Flow (MAF) sensor, see Mass air flow sensor (MAF), replacing .
- For resistance values, see Component specifications .
- For information about signals on 5-cylinder engines, see Signal specification .
- For information about signals on 6 cylinder engines:
- For 6 cylinder engines -2001, see Signal specification
- For 6 cylinder engines 2002-, see Signal specification
- For 6 cylinder engines -2004, see Signal specification
- For 6 cylinder engines 2005-, see Signal specification .
- Continue
Refer to Verification