HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AFC-129

DTC Code DTC Name
P0AFC-129 Battery Pack Sensor Module

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    The EV control ECU detects a VB 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 VB and the voltage after boosting (VH) are large, the EV control ECU determines that there is a malfunction in the VB sensor circuit, and will output DTC P0AFC-129.

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


      Inside of battery voltage sensor VB sensor circuit malfunction

    • Battery voltage sensor malfunction

    • Communication (wire harness) malfunction


      High voltage system malfunction

    • EV battery malfunction

DESCRIPTION

The battery voltage sensor sends EV battery voltage information to the EV control ECU via serial communication.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P0AFC-129 Battery Pack Sensor Module

Battery voltage sensor malfunction ("VB-Battery Voltage" output value is abnormal):

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

(1 trip detection logic)

 Battery voltage sensor

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P0AFC-129

  • VB-Battery Voltage

  • VL-Voltage before Boosting

  • VH-Voltage after Boosting

  • Boost Ratio

The following items can be helpful when performing repairs:


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

After the repair, if "VL-Voltage before Boosting" and "VB-Battery Voltage" are approximately the same when the power switch is turned on (READY) with the shift lever in P and the accelerator pedal not depressed, 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
      P0AFC-129 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 P1D8F-474, 475, 476, 477, 481 FC Air Compressor Motor "A" Control Module
      P0A1B-164, 193, 512, 661, 786 Drive Motor "A" Control Module
      P0A1D-148 Hybrid Powertrain Control Module
      P324E-788 MG-ECU Power Relay Intermittent Circuit
      Power source circuit malfunction P2511-149 ECM/PCM Power Relay Sensor Circuit Intermittent
      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.

      • P0AFC-129 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 BATTERY VOLTAGE SENSOR Click here

    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    C

    GO TO DTC CHART (HYBRID BATTERY SYSTEM) Click here