Diagnostic Test

WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

1) TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

With the scan tool, select ECU view.

NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

NOTE: Check the TIPM for any active ignition related DTCs, perform DTC before proceeding.

Does the scan tool display a red X next to the module?

Yes
1. Go To step 2).
No
1. The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
2) ATTEMPT TO ESTABLISH COMMUNICATIONS WITH THE GATEWAY MODULE
With the scan tool, select ECU view.

Does the scan tool display a red X next to the Gateway module?

Yes
1. Refer to the *NO RESPONSE FROM GATEWAY MODULE - 1.6L .
No
1. Go To step 3).
3) (D25) PCI BUS CIRCUIT OPEN

Fig 1: MEASURING RESISTANCE OF PCI BUS CIRCUIT
Courtesy of DAIMLERCHRYSLER CORP.

With the scan tool, read PCM DTC's. This is to ensure power and ground to the PCM are operational.

NOTE: If the scan tool will not read PCM DTC's, follow the *NO RESPONSE FROM PCM (SCI ONLY) - 1.6L symptom.

NOTE: If the vehicle will not start and the scan tool displays a no response message, refer to the appropriate ENGINE ELECTRICAL DIAGNOSTICS - DIAGNOSTIC CODE INDEX for the appropriate symptom.

Turn the ignition off.

Disconnect the PCM harness connector.

Measure the resistance of the (D25) PCI Bus circuit between the DLC and the PCM connector.

Is the resistance below 5.0 ohms?

Yes
1. Replace the Powertrain Control Module. For removal and installation, refer to the ELECTRONIC CONTROL MODULES - SERVICE INFORMATION article, also see STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING .
2. Perform POWERTRAIN VERIFICATION TEST - VER 1.:
  - For 1.6L (Refer to POWERTRAIN VERIFICATION TEST) .
  - For 2.4L (Refer to POWERTRAIN VERIFICATION TEST) .
No
1. Repair the (D25) PCI Bus circuit for an open.
2. Perform POWERTRAIN VERIFICATION TEST - VER 1.:
  - For 1.6L (Refer to POWERTRAIN VERIFICATION TEST) .
  - For 2.4L (Refer to POWERTRAIN VERIFICATION TEST) .