Selecting System Level

Following trouble code display, first available system will be displayed (i.e., IPC?). When selecting a system to test, any of following actions may be taken to control display:

1. Depressing OFF button on ECC panel will stop system selection process and return display to beginning of PCM trouble code sequence.
2. Depressing LO (fan down) button on ECC panel will display next available system selection (i.e., IPC?, ACP? or SIR?).
3. Depressing HI (fan up) button on ECC panel will select displayed system for testing (i.e., PCM DATA, PCM INPUTS, PCM OUTPUTS, etc.). See Figure .
4. Depressing OFF button on ECC panel will exit SERVICE MODE and diagnostics and will return system to normal display and operation.