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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 562 (Supplemental Restraint System) >> Diagnosis And Testing >> Airbag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test Y: DTCs U0028:08 and U0028:88 >> PINPOINT TEST Y: DTCs U0028:08 and U0028:88

PINPOINT TEST Y: DTCs U0028:08 and U0028:88

WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the Safety Canopy and cause serious personal injury or death.
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.
WARNING: Never disassemble or tamper with seat belt deployable components, including pretensioners, load limiters and inflators. Never back probe deployable device electrical connectors. Tampering or back probing may cause an accidental deployment and result in personal injury or death.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough INSPECTION AND VERIFICATION  before proceeding with the pinpoint test.
NOTE: Only disconnect or reconnect Supplemental Restraint System (SRS) components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS  .
NOTE: Always make sure the correct SRS  component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the parts catalog to make sure the correct component is being installed. If an incorrect SRS  component is installed, DTCs may set.
NOTE: The SRS  must be fully operational and free of faults before releasing the vehicle to the customer.
  1. Y1 RETRIEVE RCM DTCs 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM  .

    Was DTC U0028:08 or U0028:88 retrieved on-demand during self-test? 

    1. Yes  : This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the self-test.

      For DTC U0028:08, GO to Y2  .

      For DTC U0028:88, GO to  Y6.

    2. No  : This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to  Y13.
  2. Y2 VERIFY THE RCM PART NUMBER 
    • Enter the following diagnostic mode on the scan tool: Log Viewer.
    • Retrieve and record the RCM  part number from Log Viewer.
    • Check the part number recorded against the part number listed in the Ford Catalog Advantage™ or equivalent.

    Is the correct RCM installed in the vehicle? 

    1. Yes  : GO to Y3  .
    2. No  : INSTALL the correct RCM  . REFER to RESTRAINTS CONTROL MODULE (RCM) . GO to  Y14.
  3. Y3 VERIFY THE ABS MODULE PART NUMBER 
    • Retrieve and record the ABS module part number from Log Viewer.
    • Check the part number recorded against the part number listed in the Ford Catalog Advantage™ or equivalent.

    Is the correct ABS module installed in the vehicle? 

    1. Yes  : GO to Y4  .
    2. No  : INSTALL the correct ABS module. REFER to the Removal and Installation procedure in ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . GO to  Y14.
  4. Y4 CHECK THE HS-CAN NETWORK COMMUNICATIONS (ABS MODULE COMMUNICATIONS) 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Network Test.
      NOTE: The Network Test does not test the dedicated CAN communications between the ABS module and RCM  .

    Did the Network Test pass (ABS module communicates with the scan tool)? 

    1. Yes  : GO to Y5  .
    2. No  : REFER to MODULE COMMUNICATIONS NETWORK to diagnose the High Speed Controller Area Network (HS-CAN)/ABS module communication concern. GO to  Y14.
  5. Y5 CHECK THE DEDICATED CAN CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: RCM  C310A and C310B.
    • Disconnect: ABS Module C135.
    • Measure the resistance between the ABS module C135, harness side and the RCM  C310B, harness side as indicated in the following chart:
      ABS Module Circuit RCM
      C135-37  VCA23 (BU/WH) C310B-20 
      C135-24  VCA24 (GN/OG) C310B-19 
      • Fig 1: Measuring Resistance Between ABS Module C135, Harness Side And RCM C310B
      G06167675Courtesy of FORD MOTOR CO.

    Are the resistances less than 3 ohms? 

    1. Yes  : GO to  Y9.
    2. No  : REPAIR circuits VCA24 (GN/OG) and/or VCA23 (BU/WH).

      Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to  Y14.

  6. Y6 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO VOLTAGE 

    Is voltage present on either circuit? 

    1. Yes  : REPAIR circuit VCA24 (GN/OG) or VCA23 (BU/WH).

      Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

      GO to  Y14.

    2. No  : GO to Y7  .
  7. Y7 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between ABS module:
      • C135-37  , circuit VCA23 (BU/WH), harness side and ground.
      • C135-24  , circuit VCA24 (GN/OG), harness side and ground.
        Fig 3: Measuring Resistance Between ABS Module C135-37, Circuit VCA23 (BU/WH), Harness Side And Ground
        G06174076Courtesy of FORD MOTOR CO.

    Are the resistances greater than 10, 000 ohms? 

    1. Yes  : GO to Y8  .
    2. No  : REPAIR circuit VCA24 (GN/OG) or VCA23 (BU/WH).

      Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

      GO to  Y14.

  8. Y8 CHECK FOR SHORT BETWEEN THE DEDICATED CAN CIRCUITS 
    • Measure the resistance between ABS module C135-37  , circuit VCA23 (BU/WH), harness side and C135-24  , circuit VCA24 (GN/OG), harness side.
      Fig 4: Measuring Resistance Between ABS Module C135-37, Circuit VCA23 (BU/WH) And C135-24, Circuit VCA24 (GN/OG)
      G06174077Courtesy of FORD MOTOR CO.

    Is the resistance greater than 10, 000 ohms? 

    1. Yes  : GO to Y9  .
    2. No  : REPAIR circuits VCA24 (GN/OG) and VCA23 (BU/WH).

      Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

      GO to  Y14.

  9. Y9 CHECK THE RCM TERMINATING RESISTOR 
    • Connect: RCM  C310B.
    • Measure the resistance between ABS module C135-37  , circuit VCA23 (BU/WH), harness side and C135-24  , circuit VCA24 (GN/OG), harness side.
      Fig 5: Measuring Resistance Between ABS Module C135-37, Circuit VCA23 (BU/WH), Harness Side And C135-24, Circuit VCA24 (GN/OG)
      G06174077Courtesy of FORD MOTOR CO.

    Is the resistance between 108 and 132 ohms? 

    1. Yes  : GO to Y10  .
    2. No  : GO to  Y11.
  10. Y10 CHECK ABS MODULE TERMINATING RESISTOR 
    • Disconnect: RCM  C310B.
    • Connect: ABS Module C135.
    • Measure the resistance between RCM C310B-20  , circuit VCA23 (BU/WH), harness side and C310B-19  , circuit VCA24 (GN/OG), harness side.
      Fig 6: Measuring Resistance Between RCM C310B-20, Circuit VCA23 (BU/WH) And C310B-19, Circuit VCA24 (GN/OG)
      G06100114Courtesy of FORD MOTOR CO.

    Is the resistance between 108 and 132 ohms? 

    1. Yes  : For DTC U0028:08, GO to Y11  .

      For DTC U0028:88, GO to  Y12.

    2. No  : GO to  Y12.
  11. Y11 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system components, sensor electrical connectors and the RCM  electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.
    • If previously directed to repower the SRS  , depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Prior to reconnecting any previously disconnected SRS  component:
      • inspect connector(s) (including any in-line connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness for any damage, pinched, cut or pierced wires.
      • inspect RCM  C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation. Refer to RESTRAINTS CONTROL MODULE (RCM) .
      • inspect ABS module C135 for dirt, corrosion, water intrusion, pushed out, loose or spread terminals and loose or frayed wire connections at terminals.
      • repair any concerns found.

        Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

    • Connect: All Previously Disconnected Component(s)/Connector(s).
    • Repower the SRS  . Do not  prove out the SRS  at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM  .

    Was DTC U0028:08 retrieved on-demand during self-test? 

    1. Yes  : INSTALL a new RCM  . REFER to RESTRAINTS CONTROL MODULE (RCM) . GO to  Y14.
    2. No  : In the process of diagnosing the fault, the fault condition has become intermittent. CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. ACTIVATE other systems in the same wire harness. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test  . GO to  Y13.
  12. Y12 CONFIRM THE ABS MODULE FAULT 
    NOTE: Make sure all restraint system components, sensor electrical connectors and the RCM  electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.
    • If previously directed to repower the SRS  , depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Prior to reconnecting any previously disconnected SRS  component:
      • inspect connector(s) (including any in-line connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness for any damage, pinched, cut or pierced wires.
      • inspect RCM  C310A and C310B CPA  lever/lock for correct operation. Refer to RESTRAINTS CONTROL MODULE (RCM) .
      • inspect ABS module C135 for dirt, corrosion, water intrusion, pushed out, loose or spread terminals and loose or frayed wire connections at terminals.
      • repair any concerns found.

        Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

    • Connect: All Previously Disconnected Component(s)/Connector(s).
    • Repower the SRS  . Do not  prove out the at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM  .

    Was DTC U0028:88 retrieved on-demand during self-test? 

    1. Yes  : INSTALL a new ABS module. REFER to the Removal and Installation procedure in ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . GO to  Y14.
    2. No  : In the process of diagnosing the fault, the fault condition has become intermittent. CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. ACTIVATE other systems in the same wire harness. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test  . GO to Y13  .
  13. Y13 CHECK FOR AN INTERMITTENT FAULT 
    • Ignition OFF.
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: RCM C310B  .
    • Disconnect: ABS module C135  .
      • inspect connector(s) (including any in-line connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness for any damage, pinched, cut or pierced wires.
      • repair any concerns found.

        Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

    • Connect: All Previously Disconnected Component(s)/Connector(s).
    • Repower the SRS  . Do not  prove out the SRS  at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM  .

    Was DTC U0028:08 or U0028:88 retrieved on-demand during self-test? 

    1. Yes  : The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during the self-test.

      CHECK for causes of the intermittent fault in the areas previously worked in, particularly the pins and terminals of any electrical connectors that were disconnected. REPAIR any intermittent wiring, terminal or connector concerns found.

      Refer to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

      GO to Y14  .

    2. No  : The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test  . GO to Y14  .
  14. Y14 CHECK FOR ADDITIONAL RCM AND ABS MODULE DTCs 
    • Ignition OFF.
      WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
    • Reconnect all SRS  components (if previously disconnected).
    • If previously directed to depower the SRS  , repower the SRS  . Do not  prove out the SRS  at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM  .
    • Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.

    Were any DTCs retrieved on-demand from the RCM or ABS module during self-test? 

    1. Yes  : Do not clear any DTCs until all DTCs have been resolved. GO to the appropriate DTC CHART  and/or ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL for pinpoint test direction.
    2. No  : CLEAR all CMDTCs  . PROVE OUT the SRS  . The repair is complete. RETURN the vehicle to the customer.
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