Pinpoint Test K: DTC U0121:00
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- K1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?
- Yes: GO to K2 .
- 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.
- K2 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- 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 K3 .
- No: REFER to DIAGNOSIS AND TESTING .
- K3 RECHECK THE PAM DTCs
- Clear the DTCs.
- Operate the system and test the system for normal operation.
- Repeat the PAM self-test.
- Is DTC U0121:00 still present?
- Yes: GO to K4 .
- 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.
- K4 CHECK FOR DTC U0121 OR DTC U0121:00 IN OTHER MODULES
- Clear all DTCs.
- Ignition OFF.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0121 or DTC U0121:00 set in any module?
- Yes: INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.
- No: GO to K5 .
- K5 CHECK FOR CORRECT PAM OPERATION
- Disconnect the PAM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the PAM 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 PAM . REFER to PARKING AID MODULE (PAM) . 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.