Chart A, Loss Of IPC Display (Non-CRT Equipped)
NOTE:
The Electronic Control Module (ECM) may be referred to as the Powertrain Control Module (PCM) in diagnostic charts and figures. The 2 terms may be used interchangeably.
Loss of IPC display and messages can result from following:
- Loss of 12 volts to IPC
- Loss of ground to IPC
- Loss of wake-up signal to BCM
- Internal fault in BCM or IPC
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This step checks to see if BCM is awake. If BCM is not awake, cause of blank display is power and/or ground related.
- This step checks BCM power and ground sources.
- This step checks to see if IPC has lost power or ground. Normally with ignition on, battery voltage should be present at listed terminals.
- This step checks for short to ground in any of the 640 circuits.
- This step checks if short to ground is inside component or in circuit.
- This step checks if IPC is receiving 7 volts from BCM.