DTC P1653: PCI Bus Shorted To Ground: Testing
- Turn the ignition off. Measure the resistance between ground and the PCI bus circuit at the Data Link Connector (DLC). Is the resistance less than 100 ohms? If yes, go to next step. If no, go to step 3 .
- Monitor the short to ground on the PCI bus circuit at the DLC. Disconnect the Air Bag Control Module (ACM), instrument cluster, Remote Keyless Entry (RKE) module, Sentry Key Immobilizer Module (SKIM), radio, side air bag module, and the PCM, one at a time, disconnecting the PCM last. If the resistance never changes to an open circuit with all of the modules disconnected, a short to ground in the harness exists. Does the resistance value change to open, or out of limits when disconnecting a specific module? If yes, replace and program the specific module that is causing the short to ground. See PROGRAMMING and/or PROGRAMMING in appropriate BODY CONTROL MODULES article. If no, repair short to ground in the PCI bus circuit.
- 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.