Pinpoint Test Ax : DTC U0121:00
- AX1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
Is an observable symptom present?
Yes GO to AX2. 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. - AX2 CHECK THE COMMUNICATION NETWORK
- Using a scan tool, perform a network test.
Does the ABS module pass the network test?
Yes GO to AX3. No REFER to Module Communications Network , The Anti-Lock Brake System (ABS) Module Does Not Respond To The Scan Tool. - AX3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST
- Check for recorded DTCs from the ABS module self-test.
Are any DTCs recorded?
Yes REFER to Anti-Lock Brake System (ABS) and Stability . No GO to AX4. - AX4 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST
- Using a scan tool, perform the IPC self-test.
Is DTC U3003:16 or DTC U3003:17 recorded?
Yes For DTC U3003:16, GO to Pinpoint Test BJ . For DTC U3003:17, GO to Pinpoint Test BK . No GO to AX5. - AX5 RECHECK THE IPC DTCs
- Using a scan tool, clear the DTCs.
- Wait 10 seconds.
- Repeat the IPC self-test.
Is DTC U0121:00 still present?
Yes GO to AX6. 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. - AX6 CHECK FOR DTC U0121:00 SET IN OTHER MODULES
- Using a scan tool, clear all DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Using a scan tool, perform self-test.
- Retrieve the continuous memory DTCs from all modules.
Is DTC U0121:00 set in the BCM ?
Yes INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) and Stability . No Refer to IPC Hardware Testing .