10B - Low Idle Stability (Icp Pressure)

10b. Low Idle Stability (ICP Pressure)

Purpose:

Low Idle Stability (ICP Pressure):

To determine if idle stability or low power is caused by a stuck or dirty IPR or faulty ICP signal.

Recommended Procedure:

NOTE: The engine must be at operating temperature.

Install NGS Tester. Turn A/C off. Access ICP PID on NGS Tester and monitor ICP pressure. Operate the engine at low idle. If engine does not stabilize, disconnect the ICP sensor. If low idle speed stabilizes with the ICP sensor disconnected, the problem is most likely in the ICP sensor circuit. GO to Pinpoint Test DC. If rpm does not stabilize, change the IPR and retest. This test should be performed with engine at normal operating temperature.

Possible Causes:
- Debris stuck in the IPR
- Inoperative ICP sensor or circuit failure

Tools Required:
New Generation Star (NGS) Tester 007-00500 or equivalent