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Pinpoint Test O: P0886, P0887

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  1. Normal Operation and Fault Conditions 

    REFER to: Electric Powertrain Control - Component Location .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    SOBDMC P0886:00 TCM Power Relay Control Circuit Low: No Sub Type Information This DTC sets when a short to ground is detected on the relay control circuit.
    SOBDMC P0887:00 TCM Power Relay Control Circuit High: No Sub Type Information This DTC sets when a short to power or open is detected on the relay control circuit.

    Possible Sources 

    • Wiring, terminals or connectors
    • BCM concern

  2. O1 CHECK FOR LOW VOLTAGE BECM (BATTERY ENERGY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    NOTE: Turn the ignition OFF for 15 seconds before carrying out the self-test or clearing DTCs.

    NOTE: DTC P0887 may set as a result of a low 12 volt battery concern.
    NOTE: DTCs P0562 and U3003 may set in addition to DTC P0887. Diagnose all other DTCs before entering this pinpoint test.

    • Ignition ON.

    • Using a diagnostic scan tool, check for DTCs in all modules.

    Are any low voltage DTCs present in any module? 

    Yes  DIAGNOSE any low voltage DTCs, REFER to the appropriate diagnosis and testing section.
    No  GO to  O2

  3. O2 CHECK FOR LOW VOLTAGE INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

    NOTE: They key cycle is very important, the DTC will not clear unless a key cycle is completed.

    • Ignition OFF.

    • Wait 15 seconds.

    • Ignition ON.

    • Using a diagnostic scan tool, clear the Inverter System Controller (ISC) DTCs.

    • Using a diagnostic scan tool, perform the Inverter System Controller (ISC) self-test.

    Are DTCs P0886 or P0887 present in the Inverter System Controller (ISC)? 

    Yes  GO to  O3
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  4. O3 CHECK THE BATTERY AND CHARGING SYSTEM

    Are the battery and charging system voltages within specification? 

    Yes  GO to  O4
    No  REPAIR as necessary. REFER to: Charging System - 2.7L EcoBoost (238kW/324PS)/3.5L EcoBoost (BM) . CLEAR the inverter System Controller (ISC) DTCs. REPEAT the self-test.

  5. O4 CHECK THE RELAY CONTROL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Inverter System Controller (ISC) C1458A.

    • Disconnect BCMC C1035C.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035C-38
      GFD558202Courtesy of FORD MOTOR COMPANY
      		 C1458A-K3

    Is the resistance less than 5 ohms? 

    Yes  GO to  O5
    No  REPAIR the open circuit.

  6. O5 CHECK RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1458A-K3
      GFD558202Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  O6
    No  REPAIR the short circuit.

  7. O6 CHECK THE RELAY CONTROL FOR A SHORT TO VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1458A-K3
      GFD558423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short circuit.
    No  GO to  O7

  8. O7 CHECK FOR CORRECT AN INTERMITTENT WIRING CONCERN

    • Ignition OFF.

    • Disconnect and inspect all Inverter System Controller (ISC) connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the Inverter System Controller (ISC) connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  GO to  O8
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

  9. O8 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) VPWR CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035C-54
      GFD558202Courtesy of FORD MOTOR COMPANY
      		 C1458A-L2

    Is the resistance less than 5 ohms? 

    Yes  GO to  O9
    No  REPAIR the open circuit.

  10. O9 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) VPWR CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035C-54
      GFD558202Courtesy of FORD MOTOR COMPANY
      		 C1458A-M2

    Is the resistance less than 5 ohms? 

    Yes  GO to  O10
    No  REPAIR the open circuit.

  11. O10 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1458A-L2
      GFD558423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short circuit.
    No  GO to  O11

  12. O11 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) RELAY VPWR CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1458A-M2
      GFD558423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short circuit.
    No  GO to  O12

  13. O12 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) ISP-R CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect BCMC C1035B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1035B-8
      GFD558202Courtesy of FORD MOTOR COMPANY
      		 C1458A-K2

    Is the resistance less than 5 ohms? 

    Yes  GO to  O13
    No  REPAIR the open circuit.

  14. O13 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) ISP-R CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1458A-K2
      GFD558423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short circuit.
    No  GO to  O14

  15. O14 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) ISP-R CIRCUIT FOR VOLTAGE

    • Ignition OFF.

    • Connect a 5 amp fused jumper wire between:
      Positive Lead Measurement / Action Negative Lead
      C1458A-K3
      GFD558424Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1458A-L2
      GFD558423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1458A-M2
      GFD558423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 10.5 V? 

    Yes  REFER to: Powertrain Control Module (PCM) Input and Output Controls . Pinpoint Test Z.
    No  INSTALL a new BCMC. REFER to: Body Control Module C (BCMC) .
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