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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1423 (Supplemental Restraint System) >> Diagnosis And Testing >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test - Restraints Control Module (RCM) >> Pinpoint Test AB: DTCs U0028:08 and U0028:88 >> PINPOINT TEST AB: DTCs U0028:08 and U0028:88

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

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. 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 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.
WARNING: Never disassemble or tamper with safety belt buckle/retractor pretensioners or adaptive load limiting retractors or probe the electrical connectors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors which increases the risk of serious 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. AB1 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 during the self-test.

      For DTC U0028:08, GO to AB2  .

      For DTC U0028:88, GO to  AB6.

    • No:  This is an intermittent fault when present as a CMDTC only. GO to  AB13.
  2. AB2 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.
    • Gain access to the RCM  and check the part number on the RCM  against the part number listed in the Ford Catalog Advantage™ or equivalent. Refer to RESTRAINTS CONTROL MODULE (RCM) .
    • Does the part number on the RCM match? 
  3. AB3 CHECK FOR CORRECT ABS MODULE 
    • Gain access the ABS module and check the part number on the ABS module against the part number listed in the Ford Catalog Advantage™ or equivalent. Refer to the Removal and Installation procedure in VEHICLE DYNAMIC SYSTEMS .
    • Does the part number on the ABS module match? 
    • Yes:  GO to AB4  .
    • No:  INSTALL the correct ABS module. REFER to the Removal and Installation procedure in VEHICLE DYNAMIC SYSTEMS . GO to  AB14.
  4. AB4 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 CAN2 communications between the ABS module and RCM  . The CAN2 is a dedicated communication network between the 2 modules.
    • Did the Network Test pass (ABS module communicate with the scan tool)? 
    • Yes:  GO to AB5  .
    • No:  REFER to MODULE COMMUNICATIONS NETWORK to diagnose the High Speed Controller Area Network (HS-CAN)/ABS module communication concern. GO to  AB14.
  5. AB5 CHECK THE CAN2 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 C155.
    • Measure the resistance between the ABS module C155, harness side and the RCM  C2041B, harness side as indicated in the following chart:
      RCM SPECIFICATION

      ABS Module Circuit RCM
      C155-18 VCA23 (BU/WH) C2041B-20
      C155-19 VCA24 (GN/OG) C2041B-19
      Fig 1: Identifying C2041B-19, C2041B-20, C155-19 And C155-20 Connectors
      G06100109Courtesy of FORD MOTOR CO.
    • Are the resistances less 5 ohms? 
    • Yes:  GO to  AB9.
    • No:  REPAIR circuit VCA24 (GN/OG) and VCA23 (BU/WH). GO to  AB14.
  6. AB6 CHECK THE CAN2 CIRCUITS FOR A SHORT TO VOLTAGE 
    • Yes:  REPAIR circuit VCA24 (GN/OG) or VCA23 (BU/WH). GO to  AB14.
    • No:  GO to AB7  .
  7. AB7 CHECK THE CAN2 CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between ABS module:
      • C155-18, circuit VCA23 (WH/BU), harness side and ground.
      • C155-19, circuit VCA24 (GN/OG), harness side and ground.
        Fig 3: Measuring Resistance Between ABS Module C155-18, C155-19 And Ground
        G06100111Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  GO to AB8  .
    • No:  REPAIR circuit VCA24 (GN/OG) or VCA23 (BU/WH). GO to  AB14.
  8. AB8 CHECK FOR SHORT BETWEEN CAN2 CIRCUITS 
    • Measure the resistance between ABS module C155-18, circuit VCA23 (WH/BU), harness side and C155-19, circuit VCA24 (GN/OG), harness side.
      Fig 4: Measuring Resistance Between ABS Module C155-18 And C155-19
      G06100112Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to AB9  .
    • No:  REPAIR circuit VCA24 (GN/OG) and VCA23 (BU/WH). GO to  AB14.
  9. AB9 CHECK THE RCM TERMINATING RESISTOR 
    • Depower the SRS  . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Connect: RCM  C2041B.
    • Measure the resistance between ABS module C155-18, circuit VCA23 (WH/BU), harness side and C155-19, circuit VCA24 (GN/OG), harness side.
      Fig 5: Measuring Resistance Between ABS Module C155-18 And C155-19
      G06100112Courtesy of FORD MOTOR CO.
    • Is the resistance between 108 and 132 ohms? 
    • Yes:  GO to AB10  .
    • No:  GO to  AB11.
  10. AB10 CHECK THE ABS MODULE TERMINATING RESISTOR 
    • Disconnect: RCM  C2041B.
    • Connect: ABS Module C155.
    • Measure the resistance between RCM  C2041B-20, circuit VCA23 (WH/BU), harness side and C2041B-19, circuit VCA24 (GN/OG), harness side.
      Fig 6: Measuring Resistance Between RCM C2041B-20 And C2041B-19
      G06100114Courtesy of FORD MOTOR CO.
    • Is the resistance between 108 and 132 ohms? 
    • Yes:  For DTC U0028:08, GO to AB11  .

      For DTC U0028:88, GO to  AB12.

    • No:  GO to  AB12.
  11. AB11 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system components 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  C2041A and C2041B Connector Position Assurance (CPA) lever/lock for correct operation. Refer to RESTRAINTS CONTROL MODULE (RCM) .
      • inspect ABS module C155 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 SYSTEM WIRING DIAGRAMS article, 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? 
    • Yes:  INSTALL a new RCM  . REFER to RESTRAINTS CONTROL MODULE (RCM) . GO to  AB14.
    • 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  AB13.

  12. AB12 CONFIRM THE ABS MODULE FAULT 
    NOTE: Make sure all restraint system components 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  C2041A and C2041B Connector Position Assurance (CPA) lever/lock for correct operation. Refer to RESTRAINTS CONTROL MODULE (RCM) .
      • inspect ABS module C155 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 SYSTEM WIRING DIAGRAMS article, 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 U0028:88 retrieved on-demand during self-test? 
    • Yes:  INSTALL a new ABS module.

      REFER to the Removal and Installation procedure in VEHICLE DYNAMIC SYSTEMS . GO to  AB14.

    • 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. SRS components should only be installed when directed to do so in the pinpoint test.  GO to AB13  .

  13. AB13 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 SYSTEM WIRING DIAGRAMS article, 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? 
    • 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 connector that were disconnected. REPAIR any intermittent wiring, terminal or connector concerns found.

      Refer to appropriate SYSTEM WIRING DIAGRAMS article, Connector Repair Procedures for schematic and connector information.

      GO to AB14  .

    • 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.  REPAIR any intermittent wiring, terminal or connector concerns found. GO to AB14  .
  14. AB14 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? 
    • Yes:  Do not clear any DTCs until all DTCs have been resolved. GO to the appropriate DTC CHART(S)  and/or VEHICLE DYNAMIC SYSTEMS for pinpoint test direction.
    • No:  CLEAR all CMDTCs  . PROVE OUT the SRS  . Repair is complete. RETURN the vehicle to the customer.
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