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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 161 (Supplemental Restraint System) >> Diagnosis And Testing >> Airbag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test - Restraints Control Module (RCM) >> Pinpoint Test U: DTCs U0028:08 and U0028:88 >> PINPOINT TEST U: DTCs U0028:08 AND U0028:88

PINPOINT TEST U: DTCs U0028:08 AND U0028:88

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.
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.
Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: Supplemental Restraint System (SRS) components should only be disconnected or reconnected 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 Ford Catalog Advantage™ or equivalent 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. U1 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? 
    • Yes  : This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test.

      For DTC U0028:08, GO to U2.

      For DTC U0028:88, GO to  U5.

    • No  : This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to  U13.
  2. U2 CHECK FOR CORRECT RCM 
    • 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.
    • Access to the RCM. Refer to RESTRAINTS CONTROL MODULE (RCM) . Check the part number on the RCM against the number listed in the Ford Catalog Advantage™ or equivalent.
    • Does the part number match? 
  3. U3 CHECK FOR CORRECT ABS MODULE 
    • Gain access to the ABS module. Check the part number on the ABS module against the part number listed in the Ford Catalog Advantage™ or equivalent.
    • Does the part number match? 
  4. U4 CHECK THE HS-CAN 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)? 
    • Yes  : GO to  U5.
    • No  : REFER to MODULE COMMUNICATIONS NETWORK to diagnose the High Speed Controller Area Network (HS-CAN)/ABS module communication concern. GO to  U14.
  5. U5 CHECK THE DEDICATED CAN CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: RCM C2041A and C2041B.
    • Disconnect: ABS Module C135.
    • Measure the resistance between the ABS module C135, harness side and the RCM C2041B, harness side as indicated in the following chart:
      ABS Module Circuit RCM
      C135-8 VCA23 (BU/WH) C2041B-20
      C135-9 VCA24 (GN/OG) C2041B-19
      Fig 1: Measuring Resistance Between ABS Module C135 And RCM C2041B
      G06404150Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : For DTC U0028:08, GO to  U9.

      For DTC U0028:88, GO to U6.

    • No  : REPAIR circuits VCA24 (GN/OG) and VCA23 (BU/WH). Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  U14.
  6. U6 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO VOLTAGE 
    • Repower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Ignition ON.
    • Measure the voltage between ABS module:
      • C135-8, circuit VCA23 (BU/WH), harness side and ground.
      • C135-9, circuit VCA24 (GN/OG), harness side and ground.
        Fig 2: Checking Dedicated CAN Circuits For Short To Voltage
        G06403265Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    • Yes  : REPAIR circuit VCA24 (GN/OG) or VCA23 (BU/WH).

      Refer to appropriate "OEM Connector Repair Procedures" for information.

      Procedures for schematic and connector information.

      GO to  U14.

    • No  : GO to U7.
  7. U7 CHECK THE DEDICATED CAN CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between ABS module:
      • C135-8, circuit VCA23 (BU/WH), harness side and ground.
      • C135-9, circuit VCA24 (GN/OG), harness side and ground.
        Fig 3: Checking Dedicated CAN Circuits For Short To Ground
        G06403263Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to U8.
    • No  : REPAIR circuit VCA24 (GN/OG) or VCA23 (BU/WH).

      Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  U14.

  8. U8 CHECK FOR SHORT BETWEEN THE DEDICATED CAN CIRCUITS 
    • Measure the resistance between ABS module C135-8, circuit VCA23 (BU/WH), harness side and C135-9, circuit VCA24 (GN/OG), harness side.
      Fig 4: Measuring Resistance Between ABS Module C135-8, Circuit VCA23 (BU/WH) And C135-9, Circuit VCA24 (GN/OG)
      G06403264Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to  U9.
    • No  : REPAIR circuits VCA24 (GN/OG) and VCA23 (BU/WH). Refer to appropriate "OEM Connector Repair Procedures" for information. GO to  U14.
  9. U9 CHECK THE RCM TERMINATING RESISTOR 
    • Connect: RCM C2041B.
    • Measure the resistance between ABS module C135-8, circuit VCA23 (BU/WH), harness side and C135-9, circuit VCA24 (GN/OG), harness side.
      Fig 5: Measuring Resistance Between ABS Module C135-8, Circuit VCA23 (BU/WH) And C135-9, Circuit VCA24 (GN/OG)
      G06403264Courtesy of FORD MOTOR CO.
    • Is the resistance between 108 and 132 ohms? 
    • Yes  : GO to U10.
    • No  : GO to  U11.
  10. U10 CHECK THE ABS MODULE TERMINATING RESISTOR 
    • Disconnect: RCM C2041B.
    • Connect: ABS Module C135.
    • Measure the resistance between RCM C2041B-20, circuit VCA23 (BU/WH), harness side and C2041B-19, circuit VCA24 (GN/OG), harness side.
      Fig 6: Measuring Resistance Between RCM C2041B-20, Circuit VCA23 (BU/WH) And C2041B-19, Circuit VCA24 (GN/OG)
      G06100114Courtesy of FORD MOTOR CO.
    • Is the resistance between 108 and 132 ohms? 
    • Yes  : For DTC U0028:08, GO to U11.

      For DTC U0028:88, GO to  U12.

    • No  : GO to  U12.
  11. U11 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system components, sensor electrical connectors and the RCM electrical connectors are connected before carrying out 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 C2041A and C2041B 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 appropriate "OEM Connector Repair Procedures" for 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 .
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • Was DTC U0028:08 retrieved on-demand during self-test? 
    • Yes  : INSTALL a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) . GO to  U14.
    • No  : In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . GO to  U13.
  12. U12 CONFIRM THE ABS MODULE FAULT 
    NOTE: Make sure all restraint system components and the RCM electrical connectors are connected before carrying out 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 C2041A and C2041B 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 appropriate "OEM Connector Repair Procedures" for 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 .
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • Was DTC U0028:88 retrieved on-demand during self-test? 
    • Yes  : INSTALL a new ABS module. REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE Removal and Installation. GO to  U14.
    • No  : In the process of diagnosing the fault, the fault condition has become intermittent.

      Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . GO to U13.

  13. U13 CHECK FOR AN INTERMITTENT FAULT 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect RCM C2041B and 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 appropriate "OEM Connector Repair Procedures" for 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? 
    • Yes  : This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test. CHECK for causes of the intermittent fault in the areas previously worked in, particularly the pins and terminals of any electrical connector that were disconnected. REPAIR any intermittent wiring, terminal or connector concerns found. Refer to appropriate "OEM Connector Repair Procedures" for information.

      GO to U14.

    • No  : The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . GO to U14.
  14. U14 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.
    • Are any DTCs retrieved from the RCM or ABS module during self-test? 
    • Yes  : Do not clear any DTCs until all DTCs have been resolved. GO to the appropriate DTC CHART  and/or ANTI-LOCK BRAKE SYSTEM AND STABILITY CONTROL for pinpoint test direction.
    • No  : CLEAR all CMDTCs. PROVE OUT the SRS. The repair is complete. RETURN the vehicle to the customer.
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