LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2014 >> C-Max Hybrid SEL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> MULTIFUNCTION Electronic Modules >> Diagnosis And Testing >> Body Control Module (BCM) >> Pinpoint Tests >> Pinpoint Test D: DTC (Diagnostic Trouble Code) U0121:00 Or DTC (Diagnostic Trouble Code) P1934:87 >> Pinpoint Test D: DTC (Diagnostic Trouble Code) U0121:00 Or DTC (Diagnostic Trouble Code) P1934:87
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Pinpoint Test D: DTC (Diagnostic Trouble Code) U0121:00 Or DTC (Diagnostic Trouble Code) P1934:87

  1. D1 VERIFY THE CUSTOMER CONCERN 
    • Ignition ON.
    • Verify there is an observable symptom present.

    Is an observable symptom present? 

    • Yes  : GO to D2 
    • 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. CLEAR the DTC  .
  2. D2 CHECK THE COMMUNICATION NETWORK 
    • Using a diagnostic scan tool, perform a network test.

    Does the ABS module pass the network test? 

    • Yes  : GO to D3 
    • No  : DIAGNOSE no communication with the ABS  module.

      REFER to: COMMUNICATIONS NETWORK .

  3. D3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE BCM (BODY CONTROL MODULE) SELF-TEST 
    • Using a diagnostic scan tool, perform the BCM  self-test.

    Is DTC U3003:16 or DTC U3003:17 recorded? 

  4. D4 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST 
    • Using a diagnostic scan tool, perform the ABS  module self-test.

    Is DTC U3003:16 or DTC U3003:17 recorded? 

  5. D5 RECHECK THE BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS) 
    NOTE: If new modules were installed prior to the DTC  being set, the module configuration may be incorrectly set during the PMI  or the PMI  may not have been carried out.
    • Clear the Diagnostic Trouble Codes (DTCs).
    • Ignition OFF.
    • Ignition ON.
    • Wait 10 seconds.
    • Using a diagnostic scan tool, perform the BCM  self-test.

    Is DTC U0121:00 or DTC P1934:87 still present? 

    • Yes  : GO to D6 
    • 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. CLEAR the DTC  .
  6. D6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0121:00 SET IN OTHER MODULES 
    • Clear all Diagnostic Trouble Codes (DTCs).
    • Ignition OFF.
    • Ignition ON.
    • Wait 10 seconds.
    • Using a diagnostic scan tool, retrieve all  Continuous Memory Diagnostic Trouble Codes (CMDTCs).

    Is DTC U0121:00 set in any other module? 

    • Yes  : GO to D7 
    • No  : GO to  D8
  7. D7 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION 
    • Ignition OFF.
    • Disconnect and inspect the ABS  module connector.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect the ABS  module connector. Make sure it seats and latches correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    • Yes  : CHECK OASIS  for any applicable Technical Service Bulletins (TSBs). If a TSB  exists for this concern, DISCONTINUE this test and FOLLOW TSB  instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ABS  module (part of the HCU  ).

      REFER to: HYDRAULIC CONTROL UNIT (HCU) .

    • No  : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
  8. D8 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all BCM  connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect the BCM  connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    • Yes  : CHECK OASIS  for any applicable Technical Service Bulletins (TSBs). If a TSB  exists for this concern, DISCONTINUE this test and FOLLOW TSB  instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new BCM  .

      REFER to: Body Control Module (BCM)  .

    • No  : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
scientia non olet · About LEMON Manuals