Pinpoint Test Ac: DTC U0100

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

AC1 REPEAT THE HCM SELF-TEST
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: HCM Self-Test.
- Clear the DTCs and repeat the HCM self-test.
- Is DTC U0100 retrieved again?
- Yes: GO to AC2 .
- No: The vehicle is operating correctly at this time. The HCM may have temporarily lost communication with the PCM.
AC2 CHECK OTHER MODULES FOR DTC U0100
- Enter the following diagnostic mode on the scan tool: Instrument Cluster (IC) Self-Test.
- Carry out the self-test for other modules on the High Speed Controller Area Network (HS-CAN). The IC , ABS module and Restraints Control Module (RCM), for example, communicate on the HS-CAN .
- Is DTC U0100 retrieved from any other module?
- Yes: GO to AC3 .
- No: GO to AC4.
AC3 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
AC4 CHECK FOR CORRECT HCM OPERATION
- Disconnect the HCM connector.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect the HCM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new HCM . REFER to HEADLAMP CONTROL MODULE (HCM) . TEST the system for normal operation.
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.