RPM MESSAGE NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
The Hands Free Module does not detect a Bus message indicating current engine RPM.
| Possible Causes |
| LOST COMMUNICATION WITH PCM |
| HANDS FREE MODULE |
Diagnostic Test
1. ATTEMPT TO COMMUNICATE WITH THE PCMStart and idle the engine.
With the scan tool, select Engine and read the Engine RPM.
Was the scan tool able to communicate with the PCM and read engine RPM?
Yes
- Go To 2
No
- (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) and perform the related symptom.
2. ERASE DTC AND ATTEMPT TO RESET
With the scan tool, erase the HFM DTC's.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the scan tool, read the HFM DTC's.
Did this DTC reset?
Yes
- Replace and program the Hands Free Module in accordance with the service information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- The condition that set this DTC is no longer present. 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.