Pinpoint Test Aw: DTC U0121

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.

AW1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?
- Yes: GO to AW2 .
- No: The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
AW2 CHECK THE COMMUNICATION NETWORK
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the ABS module pass the network test?
- Yes: GO to AW3 .
- No: REFER to MODULE COMMUNICATIONS NETWORK .
AW3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST
- Check for recorded IC DTCs from the self-test.
- Is DTC B1317 or DTC B1318 recorded?
- Yes: For DTC B1317, GO to PINPOINT TEST AQ .
  For DTC B1318, GO to PINPOINT TEST AR .
- No: GO to AW4 .
AW4 RECHECK THE IC DTCs
NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during Programmable Module Installation (PMI) or the PMI may not have been carried out.
- Clear the DTCs. Repeat the IC self-test.
- Is DTC U0121 still present?
- Yes: INSTALL a new ABS module. REFER to VEHICLE DYNAMIC SYSTEMS . TEST the system for normal operation. REPEAT the IC self-test.
  If DTC U0121 is still present, INSTALL a new IC . REFER to INSTRUMENT CLUSTER (IC) . TEST the system for normal operation.
- 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.