Pinpoint Test Q: DTC U0155

WARNING: This page is about a different car, the 2013 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Q1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?
- Yes : GO to Q2.
- 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.
Q2 CHECK THE COMMUNICATION NETWORK
- Using a scan tool, carry out a Network Test.
- Does the IPC pass the network test?
- Yes : GO to Q3.
- No : REFER to MODULE COMMUNICATIONS NETWORK .
Q3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND IPC SELF-TESTS
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
- Enter the following diagnostic mode on the scan tool: Self Test - IPC.
- Is ABS module DTC B1676 or IPC DTC U3003:16 or DTC U3003:17 received?
- Yes : For ABS module DTC B1676, GO to PINPOINT TEST A .
  For IPC DTCs, REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES .
- No : GO to Q4.
Q4 RECHECK THE ABS MODULE DTCs
- Clear the DTCs.
- Ignition OFF.
- Wait 10 seconds.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
- Is DTC U0155 still present?
- Yes : GO to Q5.
- 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.
Q5 CHECK FOR DTC U0155 OR U0155:00 SET IN OTHER MODULES
- Clear the DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self Test - All CMDTCs.
- Is DTC U0155:00 set in more than 1 module?
- Yes : INSTALL a new IPC. REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES . CLEAR the DTCs. REPEAT the ABS module self-test.
- No : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.