Diagnostic Aids

Check for faulty connections or damaged harness. Ensure harness is not routed too close to high-voltage wires, such as spark plug cables. If connections and harness appear okay, observe scan tool while moving all related harness and connectors. A change in scan tool display indicates fault location.

Check for plugged intake air duct or filter element. Check minimum airflow rate as follows:

• Run engine and allow it to reach operating temperature.
• Disconnect IAC valve and install IAC Driver (J37027).
• With engine idling, command IAC valve to fully extended position (zero counts).
• Using scan tool, observe MASS AIRFLOW VALUE.
• VIN K - If MAF value is less than 2.27 grams per second, clean or replace throttle body as necessary.
• VIN 1 - If MAF value is less than 2.95 grams per second, clean or replace throttle body as necessary.