DC10 - Check For Intermittent Sensor
Continuous Memory Diagnostic Trouble Code (DTC) 157 indicates the Mass Air Flow (MAF) sensor signal went below 0.4 volt sometime during the last 80 warm-up cycles.
Possible causes:
- Poor continuity in MAF sensor harness or connectors.
- Intermittent open or short in MAF sensor or harness.
- Damaged MAF sensor.
- Idle Air Control (IAC) system failure (at closed throttle position).
- Clear continuous memory. Clearing Diagnostic Trouble Codes
- Start engine and idle for 5 to 10 minutes.
- Vehicle in "PARK" or "NEUTRAL".
- Suddenly goose (greater than a half second) the throttle, approaching 1500 rpm.
- Allow to return to idle.
- Then, goose the throttle again, approaching 1500 rpm.
- Key "ON", engine "OFF".
- Run Self-Test to observe Continuous Memory DTCs.
- Is Continuous Memory DTC 157 present?
Yes -- Go to DC13. DC13 - Air Leak at MAF Sensor
No -- Go to DC11. DC11 - Monitor MAF Circuit Under Simulated Road Shock