Information Bus: Service and Repair

Establishing An IDS Session

General Procedure

1. Establish a scan tool session.

2. Turn ignition to RUN.

NOTE: For IA (Intelligent Access) vehicles, REFER to RUN .If the RFA (Remote Function Actuator) module has been replaced, it may not be possible to put the ignition in RUN. The RFA (Remote Function Actuator) module can communicate with a scan tool with the ignition in the OFF state.

3. The scan tool first attempts to communicate with the PCM (Powertrain Control Module). After establishing communication with the PCM (Powertrain Control Module), the scan tool then attempts to communicate with all other modules on the vehicle.

4. If an IDS (Integrated Diagnostic System) session cannot be established with the vehicle, IDS (Integrated Diagnostic System) may state "No communication can be established with the PCM (Powertrain Control Module)."

5. Choose "NO" when the scan tool prompts whether or not to retry communication.

6. Enter either a PCM (Powertrain Control Module) part number, tear tag or calibration number to identify the vehicle and start a session. The PCM (Powertrain Control Module) part number and 4-character tear tag number are printed on the PCM (Powertrain Control Module) label. If the PCM (Powertrain Control Module) part number cannot be found, a base part number search on the HVBOM application (under the OASIS (On-Line Automotive Service Information System) tab on the technician service publication website) retrieves the PCM (Powertrain Control Module) part number.

7. REFER to Diagnostic Routine A: The Powertrain Control Module (PCM) Does Not Respond To The Scan Tool Diagnostic Routine A.