Diagnostic Procedure

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.