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PINPOINT TEST K: STABILITY CONTROL SENSOR COMMUNICATION AND SIGNAL FAILURE DTCs

WARNING: Never probe the electrical connectors on air bag, Safety Canopy® or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, 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. K1 CHECK FOR A HS-CAN CONCERN WITH THE RCM 
    • Ignition ON.
      • NOTE: The network test does not test the dedicated CAN communications between the ABS module and RCM  .
    • Using the scan tool, carry out the network test.
    • Does the RCM pass the Network Test? 
    1. Yes:  GO to K2  .
    2. No:  REFER to MODULE COMMUNICATIONS NETWORK to diagnose the RCM  does not respond to the scan tool.
  2. K2 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.
    • Does the part number on the RCM match the part number listed in the parts catalog? 
    1. Yes:  GO to K3  .
    2. No:  INSTALL the correct RCM  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.
  3. K3 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO VOLTAGE 
    • Depower the Supplemental Restraint System (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: RCM  C310B.
    • Disconnect: ABS Module C135.
    • Ignition ON.
    • Measure the voltage between ground and:
      • ABS module C135-19, circuit VCA24 (GN/OG), harness side.
      • ABS module C135-18, circuit VCA23 (BU/WH), harness side.
        Fig 1: Measuring Voltage Between Ground And ABS Module C135-19, Circuit VCA24 (GN/OG), Harness Side
        G06938862Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes:  REPAIR the affected circuit(s) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    2. No:  GO to K4  .
  4. K4 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between ground and:
      • ABS module C135-19, circuit VCA24 (GN/OG), harness side.
      • ABS module C135-18, circuit VCA23 (BU/WH), harness side.
        Fig 2: Measuring Voltage Between Ground And ABS Module Connector End View
        G06938863Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. Yes:  GO to K5  .
    2. No:  REPAIR the affected circuit(s). TEST the system for normal operation.
  5. K5 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TOGETHER 
    • Measure the resistance between ABS module C135-19, circuit VCA24 (GN/OG), harness side and ABS module C135-18, circuit VCA23 (BU/WH), harness side.
      Fig 3: Measuring Resistance Between ABS Module And ABS Module Connector End View
      G06938864Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes:  GO to K6  .
    2. No:  REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  6. K6 CHECK THE DEDICATED CAN CIRCUITS FOR AN OPEN 
    • Measure the resistance between the ABS module C135, harness side and the RCM  C310B, harness side as follows:
      ABS MODULE CONNECTOR REFERENCE CHART

      ABS Module Circuit RCM
      C135-18 VCA23 (BU/WH) C310B-20
      C135-19 VCA24 (GN/OG) C310B-19
      Fig 4: Identifying ABS Module Connector Terminals Identification
      G07397597Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes:  GO to K7  .
    2. No:  REPAIR the affected circuit(s). CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
  7. K7 CHECK FOR CORRECT RCM OPERATION 
    • Disconnect: RCM  C310B.
    • Check for:
      • corrosion
      • pushed-out pins
      • spread terminals
    • Connect: RCM  C310B.
    • Make sure the connector is seated correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes:  INSTALL a new RCM  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.

      If DTC U0151:88 is retrieved again GO to K8 

    2. 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. K8 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect: ABS module C135.
    • Check for:
      • corrosion
      • pushed-out pins
      • spread terminals
    • Connect: ABS module C135.
    • Make sure the connector is seated correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes:  For vehicles without adaptive cruise control, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.

      For vehicles with adaptive cruise control, INSTALL a new HCU  . REFER to HYDRAULIC CONTROL UNIT (HCU) .

    2. 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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