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 GTS, check the Data List of Power Resource VB and Batt Pack Current Val. If these values are not within the below range, there is a battery smart unit malfunction.

A01UZH9E01
*1 Power Resource VB to Batt Pack Current Val (20 to 40°C (68 to 104°F))
*2 Power Resource VB (V)
*3 Batt Pack Current Val (A)
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

CAUTION / NOTICE / HINT

Tech Tips

When the accelerator pedal is not depressed with the ignition switch to ON (READY) and shift lever in P, if "VL-Voltage before Boosting" and the "Power Resource VB" is approximately same after repair, the condition is judged as normal.

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Enter the following menus: 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
      P0A94-587 and P0A94-585 (boost converter voltage (VL) sensor performance problem) are output. D

    5. Turn the ignition switch off.


    B

    GO TO DTC CHART (P0AFC-129) Click here

    C

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    D

    GO TO DTC CHART (P0A94-585) Click here

    A

  2. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

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

    5. Clear DTCs and freeze frame data.

    6. Turn the ignition switch off.


    NEXT

  3. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3. (*1)

    2. Turn the ignition switch to ON (READY). (*2)

    3. Enter the following menus: Powertrain / Hybrid Control / Data List (*3)

    4. If both "Power Resource VB" and "VL-Voltage before Boosting" are less than 155 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise them to 155 V or more. (*4)

    5. Move the shift lever to P. (*5)

    6. Set the air conditioning to MAX COOL and turn the headlights on. (*6)

    7. Confirm that "Batt Pack Current Val" is more than 3 A. (*7)

    8. Leave the vehicle for 15 seconds with the engine stopped during steps (*5) (*6) and (*7). (*8)

    9. Enter the following menus: Powertrain / Hybrid Control / DTC. (*9)

    10. Check if DTCs are output. (*10)

      Note

      If the low HV battery charge warning light comes on, move the shift lever to P and start the engine to charge the HV battery. After the engine stops, perform steps (*1) through (*10) again.

      Result
      Result Proceed to
      No DTCs are output, or DTCs other than the following are output. A
      P0AFC-129 (HV battery voltage circuit malfunction) is output. B
      P0A94-585 (boost converter voltage (VL) sensor performance problem) is output. C
      P3000-388 (discharge inhibition) is output. D
      P3004-132 (high voltage power supply line problem) is output. E

    11. Turn the ignition switch off.


    B

    REPLACE BATTERY SMART UNIT Click here

    C

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    D

    LEAVE VEHICLE WITH SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS (PERFORM STEPS (*1) THROUGH (*10))

    E

    REPLACE BATTERY SMART UNIT Click here

    A

  4. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Turn the ignition switch to ON (READY). (*11)

    2. Perform a road test that repeats full acceleration to 60 km/h (37 mph) and then braking to a complete stop three times. (*12)

      CAUTION:

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

    3. Connect the GTS to the DLC3. (*13)

    4. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. (*14)

    5. Check if DTCs are output. (*15)

      Result
      Result Proceed to
      No DTCs are output, or DTCs other than the following are output. A
      P0AFC-129 (HV battery voltage circuit malfunction) is output. B
      P0A94-585 (boost converter voltage (VL) sensor performance problem) is output. C
      P3000-388 (discharge inhibition) is output. D
      P3004-132 (high voltage power supply line problem) is output. E

    6. Turn the ignition switch off.


    B

    REPLACE BATTERY SMART UNIT Click here

    C

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    D

    LEAVE VEHICLE WITH SHIFT LEVER IN P, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS (PERFORM STEPS (*11) THROUGH (*15))

    E

    REPLACE BATTERY SMART UNIT Click here

    A

  5. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (READY).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List.

    4. Select "Power Resource VB", "VL-Voltage before Boosting" and "VH-Voltage after Boosting" in the Data List.

    5. If both "Power Resource VB" and "VL-Voltage before Boosting" are less than 155 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise them to 155 V or more.

    6. Move the shift lever to P (the engine is off), and read the Data List when the vehicle is stationary.

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

      B. 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 35 V.

      		 B

      C. Both of the following are satisfied:


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

      • Difference between "Power Resource VB" and "VH-Voltage after Boosting" is more than 10 V.

      		 C

    7. Turn the ignition switch off.


    B

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    C

    REPLACE BATTERY SMART UNIT Click here

    A

  6. CHECK FREEZE FRAME DATA (HYBRID CONTROL)


    1. Using the GTS, read the freeze frame data of DTC P0A94-587 recorded in step 2.

      Result
      Result Proceed to
      Both of the following are satisfied or both of the following are not satisfied. A
      "Power Resource VB" is less than 114 V or more than 200 V. B
      "VL-Voltage before Boosting" is less than 114 V or more than 200 V. C

    2. Turn the ignition switch off.


    B

    REPLACE BATTERY SMART UNIT Click here

    C

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    A

  7. CHECK FREEZE FRAME DATA (HYBRID CONTROL)


    1. Using the GTS, read the freeze frame data of DTC P0A94-587 recorded in step 2.

      Tech Tips

      In the freeze frame data, read the "Power Resource VB" and all of the "Battery Block Vol".

      Result
      Result Proceed to
      A. Others (Freeze frame data is not stored). A

      B. Both of the following are satisfied:


      • Sum of all "Battery Block Vol" is more than ("Power Resource VB" - 30 V)

      • Sum of all "Battery Block Vol" is less than ("Power Resource VB" + 20 V)

      		 B
      Neither A nor B is satisfied. C

    2. Turn the ignition switch off.


    B

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    C

    REPLACE BATTERY SMART UNIT Click here

    A

  8. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (READY).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List.

    4. If both "Power Resource VB" and "VL-Voltage before Boosting" are less than 155 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise them to 155 V or more.

    5. Move the shift lever to P (the engine is off), and read the "Power Resource VB" and all of the "Battery Block Vol", when the vehicle is stationary.

      Result
      Result Proceed to

      Both of the following are satisfied:


      • Sum of all "Battery Block Vol" is more than ("Power Resource VB" -30 V)

      • Sum of all "Battery Block Vol" is less than ("Power Resource VB" +20 V)

      		 A
      The preceding condition is not satisfied. B

    6. Turn the ignition switch off.


    A

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here

    B

    REPLACE BATTERY SMART UNIT Click here