9A. Check VPWR During Cranking

9a.Check VPWR During Cranking

Purpose:

To verify PCM power-up during cranking. Lack of power to PCM can cause a no-start condition as well as fault code loss.






Recommended Procedure:

In stall NGS Tester. Access VPWR PID on NGS Tester and monitor while cranking the engine.

Possible Causes:

- Low battery voltage
- Charging system problem
- Power circuit and ground faults to the PCM

GO to Pinpoint Test A to diagnose a voltage concern.

Note: Battery voltage below 9.5 volts can cause the NGS Tester to reset. If the NGS Tester resets during a self test or while PID monitoring it may be necessary to install a battery charger to maintain the correct voltage.

Tools Required:

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