Chart B, Loss Of Serial Data Non-CRT Equipped
IPC indicates loss of serial data communication by displaying the message ELECTRICAL PROBLEM. All other segments are blank. If display is fully illuminated and ELECTRICAL PROBLEM message is displayed, enter diagnostics and proceed to appropriate code chart. Do not use CHART A. Loss of serial data communications can occur for the following reasons:
- Short to ground anywhere in circuit No. 800
- Short to voltage anywhere in circuit No. 800
- Two opens in circuit No. 800
- Loss of 7 volt supply which powers serial communication
- Internal BCM or IPC fault
NOTE:
Test numbers refer to numbers on diagnostic chart.
Test Number 1) This step checks to see if ECC head has lost data communication along with IPC.
Test Number 2) Since IPC has lost data communications, shorting terminal M at ALDL connector should NOT remove data communications from ECC head. If this does happen, IPC is receiving data but is unable to communicate due to poor connection or an internal problem.