Pinpoint Test K : DTC U0100
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
- K1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using the diagnostic scan tool, perform the network test.
Does the PCM pass the network test?
Yes ATCM, GO to K2 No To diagnose the module does not respond to the scan tool, REFER to: Gear Shift Module (GSM) . - K2 CHECK FOR ATCM (ALL TERRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
- Clear all DTCs.
- Using the diagnostic scan tool, perform the ATCM self-test.
Is DTC U0100 present?
Yes GO to K3 No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - K3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE ATCM (ALL TERRAIN CONTROL MODULE) SELF-TEST
- Check for DTCs from the self-test.
Are any ATCM DTCs present?
Yes REFER to the ATCM DTC chart and diagnose those DTCs first. No GO to K4 - K4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE) SELF-TEST
- Check for DTCs from the self-test.
Are DTCs P0562, P0563 and/or P1397 present?
Yes REFER to: Battery . No GO to K5 - K5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100 SET IN OTHER MODULES
- Using the diagnostic scan tool, perform the self-test for all modules.
- Retrieve the DTCs from all modules.
Is DTC U0100 present in the ABS or IPC modules?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs address this concern, Refer to PCM GUIDED ROUTINE TESTING -- NAVIGATOR . No If the reporting module is the ATCM, INSTALL a new ATCM.