Diagnostic Procedure

DTC 31 - MAP Sensor Signal

DIAGNOSTIC PROCEDURE

1. CHECK VOLTAGE OF TERMINAL VG OF ECM.
- If OK check and replace ECM.
- If not OK proceed to step 2.
2. CHECK VOLTAGE OF MASS AIR FLOW METER POWER SOURCE.
- If OK proceed to step 3.
- If not OK check and repair mass air flow meter power source circuit.
3. CHECK FOR OPEN AND SHORT IN HARNESS AND CONNECTOR BETWEEN ECM AND MASS AIR FLOW METER.
^. If OK replace mass air flow meter.
- If not OK repair or replace harness or connector.