HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A94-587

DTC Code DTC Name
P0A94-587 DC / DC Converter Performance

DESCRIPTION

For a description of the boost converter, Click here.

The MG ECU uses a voltage sensor (VL) that is built into the boost converter to detect the high voltage before it is boosted. The ECU also uses the battery smart unit to detect HV battery voltage (VB).

Tech Tips

Using the intelligent tester, check the data list for the HV battery voltage and current. If these values are not within the range below, there is a battery smart unit malfunction.

A01H0TGE04
DTC No. INF Code DTC Detection Condition Trouble Area
P0A94 587 Voltages from HV battery voltage (VB) sensor and boost converter voltage (VL) sensor deviate

  • Inverter with converter assembly

  • Battery smart unit

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.

      Result
      Result Proceed to
      DTC P0A94-587 only is output. Alternatively, P0A94-587 and any DTCs other than P0AFC-129, P0A94-442 or P0A94-585 are output. A
      P0A94-587 and P0AFC-129 (HV battery voltage circuit malfunction) are output. B
      P0A94-587 and P0A94-442 (abnormal voltage execution value) are output.

      C

      (for LHD)

      D

      (for RHD)
      P0A94-587 and P0A94-585 (boost converter voltage (VL) sensor performance problem) are output. E

    B

    GO TO DTC CHART (P0AFC-129) Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    D

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    E

    GO TO DTC CHART (P0A94-585) Click here

    A

  2. CLEAR DTC


    1. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

    2. Read and record the DTCs and freeze frame data.

    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

    4. Clear DTCs and freeze frame data.


    NEXT

  3. CHECK DTC OUTPUT (HV)


    1. Turn the power switch on (READY). (*1)

    2. Move the shift lever to the N position. (*2)

    3. Turn the A/C switch to the MAX COOL position. (*3)

    4. Select the following menu items: Powertrain / Hybrid Control / Data List / Batt Pack Current Val. (*4)

    5. Confirm that "Batt Pack Current Val" is more than 3 A. (*5)

    6. Leave the vehicle in the condition specified in preceding steps *3 and *5 for 15 seconds. (*6)

    7. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes. (*7)

    8. Check if DTCs are output. (*8)

      Note

      If the low battery charge warning light comes on, move the shift lever to the P position and start the engine to charge the HV battery. After the engine stops, perform steps *1 through *8 again.

      Result
      Result Proceed to
      No DTCs are output. A

      P0AFC-129 (HV battery voltage circuit malfunction) is output.

      P3004-132 (high-voltage power supply line problem) is output.

      		 B
      P0A94-585 (boost converter voltage (VL) sensor performance problem) is output.

      C

      (for LHD)

      D

      (for RHD)
      P3000-388 (discharge inhibition) is output. E

    B

    REPLACE BATTERY SMART UNIT Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    D

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    E

    LEAVE VEHICLE IN P POSITION, AND CHARGE HV BATTERY IN IDLE STATUS UNTIL IDLING STOPS (PERFORM STEPS *1 THROUGH *8)

    A

  4. CHECK DTC OUTPUT (HV)


    1. Perform a road test that repeats full acceleration to 60 km/h (37 mph) and then braking to a complete stop three times. (*9)

      Note

      Perform this test only in an appropriate safe location, in accordance with all local laws.

    2. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes. (*10)

    3. Check if DTCs are output. (*11)

      Result
      Result Proceed to
      No DTCs are output. A

      P0AFC-129 (HV battery voltage circuit malfunction) is output.

      P3004-132 (high-voltage power supply line problem) is output.

      		 B
      P0A94-585 (boost converter voltage (VL) sensor performance problem) is output.

      C

      (for LHD)

      D

      (for RHD)
      P3000-388 (discharge inhibition) is output. E

    B

    REPLACE BATTERY SMART UNIT Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    D

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    E

    LEAVE VEHICLE IN P POSITION, AND CHARGE HV BATTERY IN IDLE STATUS UNTIL IDLING STOPS (PERFORM STEPS *9 THROUGH *11)

    A

  5. READ VALUE USING INTELLIGENT TESTER


    1. Turn the power switch on (READY).

    2. Select the following menu items: Powertrain / Hybrid Control / Data List / Power Resource VB, VL-Voltage before Boosting, VH-Voltage after Boosting.

    3. Turn the engine off, move the shift lever to the N position, and read the data list when the vehicle is stationary.

      Result
      Result Proceed to
      Both of the following are not satisfied. A

      Both of the following are satisfied:


      • Difference between "Power Resource VB" and "VH-Voltage after Boosting" is less than 5 V.

      • Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting"is more than 30 V.

      B

      (for LHD)

      C

      (for RHD)

      Both of the following are satisfied:


      • Difference between "VH-Voltage after Boosting" and "VL-Voltage before Boosting" is more than 5 V.

      • Difference between "PWR RESOURCE VB" and "VH-Voltage after Boosting" is less than 20 V.

      		 D

    B

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    D

    REPLACE BATTERY SMART UNIT Click here

    A

  6. CHECK FREEZE FRAME DATA


    1. Turn the power switch on (IG).

    2. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

    3. Read the freeze frame data of DTC P0A94-587.

      Result
      Result Proceed to
      Both of the following are satisfied or both of the following are not satisfied. A
      "PWR RESOURCE VB" is less than 230 V or more than 395 V. B
      "VL-Voltage before Boosting" is less than 230 V or more than 395 V.

      C

      (for LHD)

      D

      (for RHD)

    B

    REPLACE BATTERY SMART UNIT Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    D

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    A

  7. CHECK FREEZE FRAME DATA


    1. Read the freeze frame data of DTC P0A94-587.

      Result
      Result Proceed to
      Freeze frame data is not stored. A

      Both of the following are satisfied:


      • Sum of all "Battery Block" voltage is more than (HV battery voltage -55 V)

      • Sum of all "Battery Block" voltage is less than (HV battery voltage +35 V)

      B

      (for LHD)

      C

      (for RHD)
      Neither of the above are satisfied. D

    B

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    D

    REPLACE BATTERY SMART UNIT Click here

    A

  8. READ VALUE USING INTELLIGENT TESTER


    1. Turn the power switch on (READY).

    2. Select the following menu items: Powertrain / Hybrid Control / Data List / Battery Block Vol -V01 to 20, Power Resource VB.

    3. Turn the engine off, move the shift lever to the N position, and read the data list for all battery block and HV battery voltages when the vehicle is stationary.

      Result
      Result Proceed to

      Both of the following are satisfied:


      • Sum of all "Battery Block" voltages is more than (HV battery voltage - 55 V)

      • Sum of all "Battery Block" voltages is less than (HV battery voltage + 35 V)

      A

      (for LHD)

      B

      (for RHD)
      The preceding condition is not satisfied. C

    B

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    C

    REPLACE BATTERY SMART UNIT Click here

    A

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here