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 voltage sensor to detect HV battery voltage (VB).

Tech Tips

Using the GTS, check the Data List values of "Power Resource VB" and "Batt Pack Current Val". If these values are not within the range below, there is a malfunction in the battery voltage sensor circuit.

A01FQMSE01
DTC No. DTC Detection Condition Trouble Area
P0A94-587

Voltages from HV battery voltage (VB) sensor and boost converter voltage (VL) sensor deviate

Difference between "VL-Voltage before Boosting" and "Power Resource VB" is large when the boosting request is given.

(1 trip detection logic)

  • Inverter with converter assembly

  • Battery voltage sensor
Related Data List
DTC No. Data List
P0A94-587

  • Power Resource VB

  • VL-Voltage before Boosting

  • VH-Voltage after Boosting

  • Boost Ratio

INSPECTION PROCEDURE

Tech Tips

When the accelerator pedal is not depressed with the power switch on (READY) and the 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 power switch on (IG).

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

    4. Check for DTCs.

      Result
      Result Proceed to
      P0A94-587 only is output. Alternatively, P0A94-587 and any DTCs except 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 power switch off.


    B

    GO TO DTC CHART (P0AFC-129) Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY 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 power switch on (IG).

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

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

    5. Clear the DTCs and freeze frame data.

    6. Turn the power switch off.


    NEXT

  3. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3. *1

    2. Turn the power switch on (READY). *2

      CAUTION:

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

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

    4. If both "Power Resource VB" and "VL-Voltage before Boosting" are below 258 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise both values to 258 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 / Trouble codes. *9

    10. Check for DTCs. *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 except the following are output. A
      P0AFC-129 (HV battery voltage circuit malfunction) is output. B
      P3004-132 (high voltage power supply line problem) is output.
      P0A94-585 (boost converter voltage (VL) sensor performance problem) is output. C
      P3000-388 (discharge inhibition) is output. D

    11. Turn the power switch off.


    B

    REPLACE BATTERY VOLTAGE SENSOR Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    D

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

    A

  4. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Turn the power switch 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

    3. Connect the GTS to the DLC3. *13

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

    5. Check for DTCs. *15

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

    6. Turn the power switch off.


    B

    REPLACE BATTERY VOLTAGE SENSOR Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    D

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

    A

  5. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Power Resource VB, VL-Voltage before Boosting, VH-Voltage after Boosting.

    4. If both "Power Resource VB" and "VL-Voltage before Boosting" are below 258 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise both values to 258 V or more.

    5. Turn the engine off, move the shift lever to P, and read the Data List with the vehicle 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 below 5 V.

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

      		 B

      Both of the following are satisfied:


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

      • Difference between "Power Resource VB" and "VH-Voltage after Boosting" is more than 15 V.

      		 C

    6. Turn the power switch off.


    B

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    C

    REPLACE BATTERY VOLTAGE SENSOR Click here

    A

  6. CHECK FREEZE FRAME DATA (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. 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
      "Power Resource VB" is below 192 V or more than 320 V. B
      "VL-Voltage before Boosting" is below 192 V or more than 320 V. C

    5. Turn the power switch off.


    B

    REPLACE BATTERY VOLTAGE SENSOR Click here

    C

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    A

  7. CHECK FREEZE FRAME DATA (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

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

      Tech Tips

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

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

      Both of the following are satisfied:


      • Sum of all "Battery Block Vol" is more than ("Power Resource VB" -45 V)

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

      		 B
      Neither A nor B is satisfied. C

    5. Turn the power switch off.


    B

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    C

    REPLACE BATTERY VOLTAGE SENSOR Click here

    A

  8. READ VALUE USING GTS (DATA LIST)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

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

    4. If both "Power Resource VB" and "VL-Voltage before Boosting" are below 258 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise both values to 258 V or more.

    5. Turn the engine off, push the P position switch, and read the "Power Resource VB" and all of the "Battery Block Vol", with 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" -45 V)

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

      		 A
      The preceding condition is not satisfied. B

    6. Turn the power switch off.


    B

    REPLACE BATTERY VOLTAGE SENSOR Click here

    A

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here