DTC P1656: PCI Bus Not Available: Testing
- Turn the ignition on. With the DRBIII(R), read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step 4 .
- Turn the ignition off. Disconnect PCM harness connectors. Measure the resistance of the PCI bus circuit between the PCM harness connector and the Data Link Connector (DLC). Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open PCI bus circuit between the PCM harness connector and the DLC.
- There are no possible causes remaining, replace PCM.
- Conditions that set DTC are not present at this time. The following list may help in identifying the intermittent condition:
- With the engine running at normal operating temperature, monitor the DRBIII(R) parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.
- Review the DRBIII(R) Freeze Frame information to identify under what conditions the DTC set.
- Refer to any Technical Service Bulletin (TSB) that may apply.
- Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
- Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
WARNING:
When the engine is operating, DO NOT stand in a direct line with the fan. DO NOT put your hands near the pulleys, belts or fan. DO NOT wear loose clothing.