HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A94-585

DTC Code DTC Name
P0A94-585 Boosting Converter Performance

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    The EV control ECU detects a VL sensor malfunction.

    If the difference between the battery voltage (VB) and voltage before boosting (VL) is large, and the EV system voltage is boosting, the EV control ECU outputs DTC P0A94-587 (VB / VL sensor malfunction (deviation)) and stops the voltage boosting. Then while the voltage boosting is stopped, if both the differences between VB and VL and between VL and the voltage after boosting (VH) are large, the EV control ECU determines that there is a malfunction in the VL sensor circuit, and will output DTC P0A94-585.

    The cause of this malfunction may be one of the following:


      Inside of inverter voltage sensor circuit malfunction

    • Voltage sensor malfunction

    • Motor generator control ECU (MG ECU) malfunction

    • Communication (wire harness) malfunction


      High voltage system malfunction

    • Inverter with converter assembly malfunction

DESCRIPTION

Refer to the description for DTC P0A94-589.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P0A94-585 Boosting Converter Performance

Boost converter voltage (VL) sensor performance malfunction:

Differences between the voltage before boosting (VL) and battery voltage (VB) and between voltage before boosting (VL) and voltage after boosting (VH) are excessively large with the voltage boosting stopped after DTC P0A94-587 (VB / L sensor malfunction (deviation)) is detected.

(1 trip detection logic)

 Inverter with converter assembly

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P0A94-585

  • VL-Voltage before Boosting

  • Power Resource VB

  • VH-Voltage after Boosting

  • Boost Ratio

CAUTION / NOTICE / HINT

Note

When the vehicle is parked with the power switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the power switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work (If the auxiliary battery voltage is needed to conduct inspection, warm up the FC system beforehand).

Tech Tips

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

PROCEDURE


  1. CHECK DTC OUTPUT (EV)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / EV / Trouble Codes.

    4. Check for DTCs.


      Powertrain > EV > Trouble Codes
      Result
      Result Proceed to
      P0A94-585 only is output, or DTCs except the ones in the tables below are also output. A
      DTCs shown in Table 1 are output simultaneously. B
      DTCs shown in Table 2 are output simultaneously. C
      Table 1
      Malfunction Content Relevant DTC
      Microcomputer malfunction P0A1B-164, 193, 512, 661, 786 Drive Motor "A" Control Module
      P0A1D-148 EV Control Module
      P1D8F-474, 475, 476, 477, 481 FC Air Compressor Motor "A" Control Module
      P324E-788 Motor CPU Power Relay Sense Circuit Intermittent No Continuity
      Power source circuit malfunction P2511-149 EV CPU Power Relay Sense Circuit Intermittent No Continuity
      Communication system malfunction U0110 (all INF codes)*1 Lost Communication with Drive Motor Control Module "A"
      Sensor and actuator circuit malfunction P0A78-266, 267 Drive Motor "A" Inverter Performance
      P0A94-589, 590 Boosting Converter Performance
      Table 2
      Malfunction Content Relevant DTC
      Microcomputer malfunction P0AFC-123 Battery Pack Sensor Module
      Sensor and actuator circuit malfunction P0B3D-123 Battery Voltage Sensor "A" Circuit Low
      P0B42-123 Battery Voltage Sensor "B" Circuit Low
      P0B47-123 Battery Voltage Sensor "C" Circuit Low
      P0B4C-123 Battery Voltage Sensor "D" Circuit Low
      P0B51-123 Battery Voltage Sensor "E" Circuit Low
      P0B56-123 Battery Voltage Sensor "F" Circuit Low
      P0B5B-123 Battery Voltage Sensor "G" Circuit Low
      P0B60-123 Battery Voltage Sensor "H" Circuit Low
      P0B65-123 Battery Voltage Sensor "I" Circuit Low
      P0B6A-123 Battery Voltage Sensor "J" Circuit Low
      P0B6F-123 Battery Voltage Sensor "K" Circuit Low
      P0B74-123 Battery Voltage Sensor "L" Circuit Low
      P0B79-123 Battery Voltage Sensor "M" Circuit Low
      P0B7E-123 Battery Voltage Sensor "N" Circuit Low
      P0B83-123 Battery Voltage Sensor "O" Circuit Low
      P0B88-123 Battery Voltage Sensor "P" Circuit Low
      P0B8D-123 Battery Voltage Sensor "Q" Circuit Low
      P0B92-123 Battery Voltage Sensor "R" Circuit Low
      P308A-123 Battery Voltage Sensor All Circuits Low

      Tech Tips


      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.

      • P0A94-585 may be output as a result of the malfunction indicated by the DTCs above.


        1. The chart above is listed in inspection order of priority.

        2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

    5. Turn the power switch off.


    A

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    C

    GO TO DTC CHART (HYBRID BATTERY SYSTEM) Click here