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Home >> Subaru >> 2020 >> Crosstrek Base, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (P-HEV Hybrid Powertrain Control System (Diagnostics) (1 Of 2)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0AA3-73: Hybrid/EV Battery Negative Contactor Actuator Stuck Closed >> Notes

DTC P0AA3-73: Hybrid/EV Battery Negative Contactor Actuator Stuck Closed: Notes

WARNING: This page is about a different variant/trim than selected.

1. - 

Outline of diagnosis: 

Even though the system main relay on the negative side of HV battery is turned off, the voltage (VH) in the inverter does not decrease

(1 trip detection logic)

Trouble symptom: 

Hybrid system stopped

Wiring diagram: 

Hybrid system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>HYBRID ELECTRIC VEHICLE SYSTEM>WIRING DIAGRAM .

G13237920Courtesy of SUBARU OF AMERICA, INC.
G13237921Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .
G13617980Courtesy of SUBARU OF AMERICA, INC.
G13617981Courtesy of SUBARU OF AMERICA, INC.
G13617982Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK DTC  .

    Read the following DTCs using Subaru Select Monitor. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to P-HEV DRIVE MOTOR (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to P-HEV HIGH VOLTAGE BATTERY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    • P-HEV Hybrid Powertrain Control
    • P-HEV Drive Motor
    • P-HEV High Voltage Battery
    NOTE:
    Malfunction contents System Related DTC
    Microcomputer malfunction P-HEV Hybrid Powertrain Control P060647 HYBRID/EV POWERTRAIN CONTROL MODULE PROCESSOR WATCHDOG/SAFETY MCU FAILURE
    P060687 HYBRID/EV POWERTRAIN CONTROL MODULE PROCESSOR TO MONITORING PROCESSOR MISSING MESSAGE
    P060A47 HYBRID/EV POWERTRAIN CONTROL MODULE MONITORING PROCESSOR WATCHDOG/SAFETY MCU FAILURE
    P060A87 HYBRID/EV POWERTRAIN CONTROL MODULE PROCESSOR FROM MONITORING PROCESSOR MISSING MESSAGE
    P0A1B49 DRIVE MOTOR "A" CONTROL MODULE INTERNAL ELECTRONIC FAILURE
    P1C9E9F HYBRID/EV SYSTEM RESET STUCK OFF
    P060B49 HYBRID/EV POWERTRAIN CONTROL MODULE A/D PROCESSING INTERNAL ELECTRONIC FAILURE
    P-HEV Drive Motor P0A1B1F GENERATOR CONTROL MODULE CIRCUIT INTERMITTENT
    P0A1A47 GENERATOR CONTROL MODULE WATCHDOG/SAFETY MC FAILURE
    P0A1A49 GENERATOR CONTROL MODULE INTERNAL ELECTRONIC FAILURE
    P1C2A1C GENERATOR A/D CONVERTER CIRCUIT CIRCUIT VOLTAGE OUT OF RANGE
    P1C2A49 GENERATOR A/D CONVERTER CIRCUIT INTERNAL ELECTRONIC FAILURE
    P1C2B1C DRIVE MOTOR "A" CONTROL MODULE A/D CONVERTER CIRCUIT VOLTAGE OUT OF RANGE
    P1C2B49 DRIVE MOTOR "A" CONTROL MODULE A/D CONVERTER CIRCUIT INTERNAL ELECTRONIC FAILURE
    P1CAC49 GENERATOR POSITION SENSOR INTERNAL ELECTRONIC FAILURE
    P1CAD49 DRIVE MOTOR "A" POSITION SENSOR INTERNAL ELECTRONIC FAILURE
    P1CAF38 GENERATOR POSITION SENSOR REF SIGNAL CYCLE MALFUNCTION SIGNAL FREQUENCY INCORRECT
    P1CB038 DRIVE MOTOR "A" POSITION SENSOR REF SIGNAL FREQUENCY INCORRECT
    P313383 COMMUNICATION ERROR FROM GENERATOR TO DRIVE MOTOR "A" VALUE OF SIGNAL PROTECTION CALCULATION INCORRECT
    P313386 COMMUNICATION ERROR FROM GENERATOR TO DRIVE MOTOR "A" SIGNAL INVALID
    P313387 COMMUNICATION ERROR FROM GENERATOR TO DRIVE MOTOR "A" MISSING MESSAGE
    P-HEV High Voltage Battery P060B49 HYBRID/EV BATTERY ENERGY CONTROL MODULE A/D PROCESSING INTERNAL ELECTRONIC FAILURE
    P060687 HYBRID/EV BATTERY ENERGY CONTROL MODULE PROCESSOR TO MONITORING PROCESSOR MISSING MESSAGE
    P060A47 HYBRID/EV BATTERY ENERGY CONTROL MODULE MONITORING PROCESSOR WATCHDOG/SAFETY MCU FAILURE
    P060A87 HYBRID/EV BATTERY ENERGY CONTROL MODULE PROCESSOR FROM MONITORING PROCESSOR MISSING MESSAGE
    P060B16 HYBRID/EV BATTERY ENERGY CONTROL MODULE A/D PROCESSING CIRCUIT VOLTAGE BELOW THRESHOLD
    P0E2D00 HYBRID/EV BATTERY ENERGY CONTROL MODULE HYBRID/EV BATTERY MONITOR PERFORMANCE
    Power supply system malfunction P-HEV Drive Motor P06D61C GENERATOR CONTROL MODULE OFFSET POWER CIRCUIT VOLTAGE OUT OF RANGE
    P06B01C GENERATOR CONTROL MODULE POSITION SENSOR REF POWER SOURCE CIRCUIT VOLTAGE OUT OF RANGE
    Communication system malfunction P-HEV Hybrid Powertrain Control P312387 LOST COMMUNICATION WITH DRIVE MOTOR CONTROL MODULE "A" FROM HYBRID/EV CONTROL MODULE MISSING MESSAGE
    U011187 LOST COMMUNICATION WITH HYBRID/EV BATTERY ENERGY CONTROL MODULE "A" MISSING MESSAGE
    Sensor and actuator circuit malfunction P-HEV Hybrid Powertrain Control P0AD911 HYBRID/EV BATTERY POSITIVE CONTACTOR CIRCUIT SHORT TO GROUND
    P0AD915 HYBRID/EV BATTERY POSITIVE CONTACTOR CIRCUIT SHORT TO AUXILIARY BATTERY OR OPEN
    P0ADD11 HYBRID/EV BATTERY NEGATIVE CONTACTOR CIRCUIT SHORT TO GROUND
    P0ADD15 HYBRID/EV BATTERY NEGATIVE CONTACTOR CIRCUIT SHORT TO AUXILIARY BATTERY OR OPEN
    P0AE411 HYBRID/EV BATTERY PRE-CHARGE CONTACTOR CIRCUIT SHORT TO GROUND
    P0AE415 HYBRID/EV BATTERY PRE-CHARGE CONTACTOR CIRCUIT SHORT TO AUXILIARY BATTERY OR OPEN
    P-HEV Drive Motor P0A3F16 DRIVE MOTOR "A" POSITION SENSOR CIRCUIT VOLTAGE BELOW THRESHOLD
    P0A4B16 GENERATOR POSITION SENSOR CIRCUIT VOLTAGE BELOW THRESHOLD
    P0A4B21 GENERATOR POSITION SENSOR SIGNAL AMPLITUDE < MINIMUM
    P0A4B22 GENERATOR POSITION SENSOR SIGNAL AMPLITUDE>MAXIMUM
    P0C5013 DRIVE MOTOR "A" POSITION SENSOR CIRCUIT "A" CIRCUIT OPEN
    P0C5016 DRIVE MOTOR "A" POSITION SENSOR CIRCUIT "A" CIRCUIT VOLTAGE BELOW THRESHOLD
    P0C5017 DRIVE MOTOR "A" POSITION SENSOR CIRCUIT "A" CIRCUIT VOLTAGE ABOVE THRESHOLD
    P0C5A13 DRIVE MOTOR "A" POSITION SENSOR CIRCUIT "B" CIRCUIT OPEN
    P0C5A16 DRIVE MOTOR "A" POSITION SENSOR CIRCUIT "B" CIRCUIT VOLTAGE BELOW THRESHOLD
    P0C5A17 DRIVE MOTOR "A" POSITION SENSOR CIRCUIT "B" CIRCUIT VOLTAGE ABOVE THRESHOLD
    P0C6413 GENERATOR POSITION SENSOR CIRCUIT "A" CIRCUIT OPEN
    P0C6416 GENERATOR POSITION SENSOR CIRCUIT "A" CIRCUIT VOLTAGE BELOW THRESHOLD
    P0C6417 GENERATOR POSITION SENSOR CIRCUIT "A" CIRCUIT VOLTAGE ABOVE THRESHOLD
    P0C6913 GENERATOR POSITION SENSOR CIRCUIT "B" CIRCUIT OPEN
    P0C6916 GENERATOR POSITION SENSOR CIRCUIT "B" CIRCUIT VOLTAGE BELOW THRESHOLD
    P0C6917 GENERATOR POSITION SENSOR CIRCUIT "B" CIRCUIT VOLTAGE ABOVE THRESHOLD
    P-HEV High Voltage Battery P301A1C HYBRID BATTERY STACK 1 CELL VOLTAGE DETECTION VOLTAGE OUT OF RANGE
    P1A001C HYBRID BATTERY STACK 2 CELL VOLTAGE DETECTION VOLTAGE OUT OF RANGE
    P1AFD1C FLYING CAPACITOR/INTERNAL CONTROL MODULE HYBRID/EV BATTERY MONITOR VOLTAGE OUT OF RANGE
    System malfunction P-HEV Hybrid Powertrain Control P0C7600 HYBRID/EV BATTERY SYSTEM DISCHARGE TIME TOO LONG
    P0D2D1C DRIVE MOTOR "A" INVERTER VOLTAGE SENSOR VOLTAGE OUT OF RANGE
    P1C8349 HIGH VOLTAGE POWER RESOURCE CIRCUIT VOLTAGE SENSOR AFTER BOOSTING MALFUNCTION
    P-HEV Drive Motor P0D2D16 DRIVE MOTOR "A" INVERTER VOLTAGE SENSOR (VH) CIRCUIT VOLTAGE BELOW THRESHOLD
    P0D2D17 DRIVE MOTOR "A" INVERTER VOLTAGE SENSOR (VH) CIRCUIT VOLTAGE ABOVE THRESHOLD
    P1CB69E DRIVE MOTOR "A" INVERTER VOLTAGE SENSOR (VH) STUCK ON

    DTC P0AA373 may be output simultaneously due to the fault that DTC above describes  .

    When "Only DTC P0AA373 is displayed" or "DTC other than above is displayed", go to  A.

    When DTCs related to [P-HEV Hybrid Powertrain Control] mentioned above are simultaneously displayed, go to  B.

    When DTCs related to [P-HEV Drive Motor] mentioned above are simultaneously displayed, go to  C.

    When DTCs related to [P-HEV High Voltage Battery] mentioned above are simultaneously displayed, go to  D.

    Yes  :

    1. Go to  2.
    2. Perform the diagnosis for the simultaneously displayed DTCs.
      NOTE: If more than one DTC is simultaneously displayed, perform the diagnosis in the order described in the above.
    3. Perform the diagnosis for the simultaneously displayed DTCs.
      NOTE: If more than one DTC is simultaneously displayed, perform the diagnosis in the order described in the above.
    4. Perform the diagnosis for the simultaneously displayed DTCs.
    NOTE: If more than one DTC is simultaneously displayed, perform the diagnosis in the order described in the above.

    No  : -

  2. CHECK FREEZE FRAME DATA  .

    Read the freeze frame data value of [P-HEV Hybrid Powertrain Control] using the Subaru Select Monitor. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>FREEZE FRAME DATA .

    Is the deviation between [VL-Voltage before Boosting] and [VH-Voltage after Boosting] at "0(s)" when DTC is confirmed less than 76 [V]?

    Yes  : Go to  3.

    No  : Replace Inverter with converter assembly. Ref. to HYBRID ELECTRIC VEHICLE>INVERTER AND CONVERTER ASSEMBLY .

    NOTE: When the voltage after boosting is occurring even though the system main relay (+ side) OFF command is issued, DTC P0AA373 is displayed. When the difference between the voltage before boosting and voltage after boosting is large, it is judged as a malfunction of the inverter (VH sensor).
  3. CHECK CONNECTION CONDITION OF CONNECTOR (Hybrid vehicle control ECU assembly CONNECTOR)  .
    CAUTION: Make sure to wear insulated gloves and protective goggles during the work.

    Check the connecting condition of connector (i369) in Hybrid vehicle control ECU assembly and check the relevant terminals for contact pressure, deformation and intrusion of water or foreign matter. Ref. to HYBRID ELECTRIC VEHICLE>INVERTER AND CONVERTER ASSEMBLY .

    Is there looseness at the connector connection, or any poor contact, deformation or intrusion of water or foreign matters at the relevant terminals?

    Yes  : Connect the connector securely. Or repair the poor contact of connector.

    And then, Go to  4.

    No  : Go to  4.

  4. CHECK CONNECTION CONDITION OF CONNECTOR (Rear harness LH CONNECTOR)  .

    Check the connecting condition of connector (R467) in Rear harness LH and check the relevant terminals for contact pressure, deformation and intrusion of water or foreign matters.

    Is there looseness at the connector connection, or any poor contact, deformation or intrusion of water or foreign matters at the relevant terminals?

    Yes  : Connect the connector securely. Or repair the poor contact of connector.

    And then, Go to  5.

    No  : Go to  5.

  5. CHECK CONNECTION CONDITION OF CONNECTOR ({Rear harness LH} CONNECTOR)  .

    Check the connecting condition of connector (R534) in Rear harness LH and check the relevant terminals for contact pressure, deformation and intrusion of water or foreign matters.

    Is there looseness at the connector connection, or any poor contact, deformation or intrusion of water or foreign matters at the relevant terminals?

    Yes  : Connect the connector securely. Or repair the poor contact of connector.

    And then, Go to  6.

    No  : Go to  6.

  6. CHECK CONNECTION CONDITION OF CONNECTOR (HV battery junction block CONNECTOR)  .
    CAUTION: Make sure to wear insulated gloves and protective goggles during the work.
    1. Check that the Service plug is disconnected. Ref. to HYBRID ELECTRIC VEHICLE>SERVICE PLUG .
    2. Check the connecting condition of connector (HV51) in HV battery junction block and check the relevant terminals for contact pressure, deformation and intrusion of water or foreign matters.

    Is there looseness at the connector connection, or any poor contact, deformation or intrusion of water or foreign matters at the relevant terminals?

    Yes  : Connect the connector securely. Or repair the poor contact of connector.

    And then, Go to  7.

    No  : Go to  7.

  7. CHECK GROUNDING POINT CONNECTION (LOW VOLTAGE CIRCUIT FOR SMR DRIVING)  .

    Check the connection of the grounding points (GB-9), (GB-10), (GB-14) and (GB-15) of the low voltage circuit for SMR driving.

    Is the grounding point connected securely?

    Yes  : Go to  8.

    No  : Connect the grounding point securely.

    And then, Go to  8.

  8. CHECK Wire harness AND CONNECTOR (Hybrid vehicle control ECU assembly - HV battery junction block) (OPEN CIRCUIT)  .
    CAUTION:
    • Make sure to wear insulated gloves and protective goggles during the work.
    • Never turn to READY ON with Service plug removed to prevent faults.
    1. Check that the Service plug is disconnected. Ref. to HYBRID ELECTRIC VEHICLE>SERVICE PLUG .
    2. Disconnect HV battery junction block connector (HV51).
    3. Disconnect Hybrid vehicle control ECU assembly connector (i369).
    4. Using a tester, measure the resistance between Hybrid vehicle control ECU assembly connector and HV battery junction block connector.

      Connector & terminal 

      (HV51) No. 3 - (i369) No. 1:

    Is the resistance less than 1 Ω?

    Yes  : Go to  9.

    No  : Repair or replace the Wire harness between Hybrid vehicle control ECU assembly connector and HV battery junction block connector.

    And then, Go to  9.

  9. CHECK Wire harness AND CONNECTOR (Hybrid vehicle control ECU assembly - HV battery junction block) (LINE-TO-LINE SHORT)  .
    CAUTION:
    • Make sure to wear insulated gloves and protective goggles during the work.
    • Never turn to READY ON with Service plug removed to prevent faults.
    1. Check that the Service plug is disconnected. Ref. to HYBRID ELECTRIC VEHICLE>SERVICE PLUG .
    2. Using a tester, measure the resistance between Hybrid vehicle control ECU assembly connector terminals.

      Connector & terminal 

      (i369) No. 1 - (i369) No. 1 - 35:

    Is the resistance 10 kΩ or more?

    Yes  : Go to  10.

    No  : Repair or replace the Wire harness between Hybrid vehicle control ECU assembly connector and HV battery junction block connector.

    And then, Go to  10.

  10. CHECK Wire harness AND CONNECTOR (HV battery junction block - CHASSIS GROUND) (OPEN CIRCUIT)  .
    CAUTION:
    • Make sure to wear insulated gloves and protective goggles during the work.
    • Never turn to READY ON with Service plug removed to prevent faults.
    1. Check that the Service plug is disconnected. Ref. to HYBRID ELECTRIC VEHICLE>SERVICE PLUG .
    2. Disconnect HV battery junction block connector (HV52).
    3. Using a tester, measure the resistance between HV battery junction block connector and chassis ground.

      Connector & terminal 

      (HV52) No. 1 - Chassis ground:

    Is the resistance less than 1 Ω?

    Yes  : Go to  11.

    No  : Repair or replace Wire harness between HV battery junction block connector and chassis ground.

    And then, Go to  11.

  11. CHECK HV battery junction block UNIT (SMRG)  .
    CAUTION:
    • Make sure to wear insulated gloves and protective goggles during the work.
    • Never turn to READY ON with Service plug removed to prevent faults.
    1. Check that the Service plug is disconnected. Ref. to HYBRID ELECTRIC VEHICLE>SERVICE PLUG .
    2. Using a tester, measure the resistance between HV battery junction block terminals.

      Connector & terminal 

      (HV51) No. 1 - (HV52) No. 1:

    Is the resistance 25.0 - 59.0 Ω? (When -40 - 80°C (-40 - 176°F))

    Yes  : Go to  12.

    No  : Go to  13.

  12. CHECK HV battery junction block UNIT (SMRG)  .
    CAUTION:
    • Make sure to wear insulated gloves and protective goggles during the work.
    • If SMR is welded, it may be removed from the welded position with a small vibration.

      Therefore, check while it is installed in the vehicle.

    • Never turn to READY ON with Service plug removed to prevent faults.
    • As a result of the freeze frame data, when the deviation between [VL-Voltage before Boosting] and [VH-Voltage after Boosting] at "0(s)" when DTC is confirmed is less than 76 V, the replacement part is HV battery junction block. Performing the continuity test allows to judge if it is a current malfunction or a past malfunction.
    1. Check that the Service plug is disconnected. Ref. to HYBRID ELECTRIC VEHICLE>SERVICE PLUG .
    2. Disconnect connectors (HV46) and (HV47) from HV battery junction block.
      CAUTION: Be sure to insulate the disconnected high voltage connector by wrapping it with insulating tape. To do this, wrap the insulating tape from Wire harness along to the connector.
    3. Using a tester, measure the resistance between HV battery junction block terminals.

      Connector & terminal 

      (HV46) No. 1 - (HV47) No. 1:

    Is the resistance 10 kΩ or more?

    Yes  : Go to  13.

    NOTE: For 10 kΩ or more, it is a past malfunction.

    No  : Go to  13.

    NOTE: For less than 10 kΩ, it indicates a current malfunction.
  13. REPLACEMENT OF HV battery junction block  .
    CAUTION: Make sure to wear insulated gloves and protective goggles during the work.
    1. Replace HV battery junction block. Ref. to HYBRID ELECTRIC VEHICLE>RELAY AND FUSE .
    2. Restore the vehicle to its original state.
    3. Attach the Service plug.
    4. Turn to IG ON.
    5. Using the Subaru Select Monitor, perform the clear memory of [P-HEV Hybrid Powertrain Control]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    6. Turn the ignition to OFF.
    7. Turn to READY ON.
    8. Using the Subaru Select Monitor, display the following items in the [Data monitor] of [P-HEV Hybrid Powertrain Control]. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DATA MONITOR .
      • VL-Voltage before Boosting
      • Hybrid Battery Voltage

    Is the difference of the data between [Hybrid Battery Voltage] and [VL-Voltage before Boosting] less than 100 [V] constantly?

    Yes  : There was something wrong with HV battery junction block.

    Finish the diagnosis.

    No  : Replace Hybrid vehicle control ECU assembly and HV battery junction block. Ref. to HYBRID ELECTRIC VEHICLE>HYBRID POWERTRAIN CONTROL MODULE .

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