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Home >> Ford >> 2012 >> Explorer Limited, 3.5 8, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 148 (Anti-Lock Brake System And Stability Control) >> Diagnosis And Testing >> Anti-Lock Brake System (ABS) and Stability Control >> Pinpoint Tests >> Pinpoint Test M: DTCs U1A00:49 and U1A00:87 >> Pinpoint Test M: DTC U1A00:49 And U1A00:87

Pinpoint Test M: DTC U1A00:49 And U1A00:87

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Never probe the electrical connectors on airbag, Safety Canopy® or side air curtain assemblies. Failure to follow this instruction may result in the accidental deployment of these assemblies, which increases the risk of serious personal injury or death.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. M1 CHECK FOR AN HS-CAN CONCERN WITH THE RCM 
    • NOTE: The network test does not test the dedicated CAN communications between the ABS module and RCM.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Network Test.
    • Does the RCM pass the network test? 
  2. M2 VERIFY THE RCM PART NUMBER 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Log Viewer.
    • Retrieve and record the RCM part number from the log viewer.
    • Check the part number recorded against the number listed in the parts catalog or equivalent.
    • Does the part number on the RCM match the part number listed in the parts catalog or equivalent? 
  3. M3 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO VOLTAGE 
    • Depower the Supplemental Restraint System (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: RCM C2041B.
    • Disconnect: ABS Module C135.
    • Connect: Negative Battery Cable.
    • Ignition ON.
    • Measure the voltage between ground and:
      • ABS module C135-9, circuit VCA24 (GN/OG), harness side.
      • ABS module C135-8, circuit VCA23 (BU/WH), harness side.
        Fig 1: Checking Dedicated CAN Circuits For Short To Voltage
        G07479180Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the affected circuit(s) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No  : GO to M4.
  4. M4 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between the ABS module C135, harness side and ground:
      • ABS module C135-9, circuit VCA24 (GN/OG), harness side.
      • ABS module C135-8, circuit VCA23 (BU/WH), harness side.
        Fig 2: Checking Dedicated CAN Circuits For Short To Ground
        G07479181Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to M5.
    • No  : REPAIR the affected circuit(s). TEST the system for normal operation.
  5. M5 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TOGETHER 
    • Measure the resistance between ABS module C135-9, circuit VCA24 (GN/OG), harness side and ABS module C135-8, circuit VCA23 (BU/WH), harness side.
      Fig 3: Measuring Resistance Between ABS Module C135-9, Circuit VCA24 (GN/OG) And ABS Module C135-8, Circuit VCA23 (BU/WH)
      G07479182Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to M6.
    • No  : REPAIR the circuits. CLEAR the DTCs. REPEAT the self-test.
  6. M6 CHECK THE DEDICATED CAN CIRCUITS FOR AN OPEN 
    • Measure the resistance between the ABS module C135, harness side and the RCM C2041B, harness side as follows:
      ABS Module Circuit RCM
      C135-8 VCA23 (BU/WH) C2041B-20
      C135-9 VCA24 (GN/OG) C2041B-19
      Fig 4: Measuring Resistance Between ABS Module C135 And RCM C2041B
      G07473859Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to M7.
    • No  : REPAIR the affected circuit(s). CLEAR the DTCs.

      CYCLE the ignition key. REPEAT the self-test.

  7. M7 CHECK FOR CORRECT RCM OPERATION 
    • Disconnect: RCM.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect: RCM.
    • Make sure the connectors are seated correctly.
    • Repower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Operate the system, verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new RCM. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

      CLEAR the DTCs. REPEAT the self-test.

      If DTCs U1A00:49 and U1A00:87 are retrieved again, GO to M8.

    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  8. M8 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect: ABS Module.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect: ABS Module.
    • Make sure the connector is seated correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . 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. CLEAR the DTCs. REPEAT the self-test.
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