Air Suspension Control Module (ASCM)
U0431-00-IMPLAUSIBLE DATA RECEIVED FROM IPM (FCM/TIPM)
For a complete wiring diagram, refer to the Wiring Information.
- When Monitored:
With the ignition on for four seconds, no CAN BUS circuit error condition present, no lost communication with TIPM condition present, and no system undervoltage or overvoltage condition present.
- Set Condition:
The Air Suspension Control Module (ASCM) is receiving no message or implausible data for ambient temperature or the transfer case selector switch.
1. DTC IS ACTIVE
NOTE: Diagnose all CAN C and CAN Interior bus communication DTCs before continuing.
NOTE: This DTC must be active for the results of this test to be valid.
1. Ignition on, engine not running.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs.
Is the status Active for this DTC?
Yes
- Go To 2
No
- Go To 3
2. CHECK FOR TOTALLY INTEGRATED POWER MODULE (TIPM) DTCS
1. With the scan tool, read DTCs in the TIPM.
Are there any TIPM DTCs present?
Yes
- Testing and Inspection Perform the appropriate diagnostic procedure.
No
- Replace the Air Suspension Control Module (ASCM). Air Suspension Control Module - Removal.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.
3. INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
2. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
3. Look for the data to change or for the DTC to reset during the wiggle test.
4. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
5. Look for the data to change other than as expected or for the DTC to reset.
Were any problems found?
Yes
- Repair as necessary.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time.