HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AFC-129

DTC Code DTC Name
P0AFC-129 Hybrid Battery Pack Sensor Module

DTC SUMMARY

MALFUNCTION DESCRIPTION

The power management control ECU detects a VB sensor malfunction.

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


  1. Inside of battery smart unit VB sensor circuit malfunction


    • Battery smart unit malfunction

    • Communication (wire harness) malfunction

  2. High voltage system malfunction


    • HV battery malfunction

DESCRIPTION

The battery smart unit (battery energy control module) sends HV battery voltage information to the power management control ECU via serial communication.

DTC No. INF Code DTC Detection Condition Trouble Area
P0AFC 129

Battery smart unit malfunction ("Power Resource VB" output value is abnormal):

When not boosting the difference between "Power Resource VB" and "VL-Voltage before Boosting" is large, and also "Power Resource VB" and "VH-Voltage after Boosting" is large.

(1 trip detection logic)

 Battery smart unit
Related Data List
DTC No. Data List
P0AFC-129

  • Power Resource VB

  • VL-Voltage before Boosting

  • VH-Voltage after Boosting

  • Boost Ratio

The following items can be helpful when performing repairs:

Data List


MONITOR DESCRIPTION

The power management control ECU calculates the differences between the received HV battery voltage, boost converter voltage, and inverter voltage. If the differences exceed prescribed values, the power management control ECU determines that there is a malfunction in the battery smart unit circuit. If the power management control ECU detects this malfunction, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs P0AFC (INF 129): Voltage (VB) sensor deviation
Required sensors / components Battery smart unit
Frequency of operation Continuous
Duration TMC's intellectual property
MIL operation 1 driving cycle
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present TMC's intellectual property
Other conditions belong to TMC's intellectual property -

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property -

COMPONENT OPERATING RANGE

Power management control ECU DTC P0AFC (INF 129): is not detected

CONFIRMATION DRIVING PATTERN


  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for 30 seconds or more.

  5. Turn the power switch on (IG) and turn the Techstream on.

  6. Turn the power switch on (READY).

  7. With the shift lever in D, depress both the accelerator pedal and brake pedal at the same time to raise the SOC to a sufficient level.

  8. Move the shift lever to P, check that the engine is stopped and move the shift lever to N.

  9. Set the A/C for maximum cooling.

  10. Leave the vehicle for a few minutes.

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

  12. Read the current DTCs.

    Tech Tips


    • If a current DTC is output, the system is malfunctioning.

    • If current DTCs are not output, perform the following steps to check for permanent DTCs.

  13. Check that the permanent DTCs are cleared.

  14. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

INSPECTION PROCEDURE

Note

Performing the check procedures for a long time with the shift lever in N may cause DTC P3000-388 to be set.

Tech Tips


  • If, after performing troubleshooting, it is necessary to replace the battery smart unit, voltages need to be confirmed after installing the new battery smart unit. Confirm that "Power Resource VB", "VL-Voltage before Boosting", and "VH-Voltage after Boosting" in the Data List are 280 V or more with the power switch on (READY), shift lever in P, and the engine stopped. When the system is normal, the "Power Resource VB", "VL-Voltage before Boosting", and "VH-Voltage after Boosting" values should be almost equal (voltage boosting will not occur when the shift lever is in N). If the difference between each voltage exceeds the values specified below, there is a malfunction in the inverter with converter assembly.

    Inspection voltage Maximum voltage difference
    Difference between "Power Resource VB" and "VL-Voltage before Boosting" 40 V
    Difference between "Power Resource VB" and "VH-Voltage after Boosting" 40 V
    Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" 50 V

  • After the repair, if "VL-Voltage before Boosting" and "Power Resource VB" 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 (HYBRID CONTROL)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Check if DTCs are output.

      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 P0A1A-151, 155, 156, 658, 659 Generator 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 DC / DC Converter Performance
      Table 2
      Malfunction Content Relevant DTC
      Microcomputer malfunction P0AFC-123 Hybrid Battery Pack Sensor Module
      Sensor and actuator circuit malfunction P0B3D-123 Hybrid Battery Voltage Sensor "A" Circuit Low
      P0B42-123 Hybrid Battery Voltage Sensor "B" Circuit Low
      P0B47-123 Hybrid Battery Voltage Sensor "C" Circuit Low
      P0B4C-123 Hybrid Battery Voltage Sensor "D" Circuit Low
      P0B51-123 Hybrid Battery Voltage Sensor "E" Circuit Low
      P0B56-123 Hybrid Battery Voltage Sensor "F" Circuit Low
      P0B5B-123 Hybrid Battery Voltage Sensor "G" Circuit Low
      P0B60-123 Hybrid Battery Voltage Sensor "H" Circuit Low
      P0B65-123 Hybrid Battery Voltage Sensor "I" Circuit Low
      P0B6A-123 Hybrid Battery Voltage Sensor "J" Circuit Low
      P0B6F-123 Hybrid Battery Voltage Sensor "K" Circuit Low
      P0B74-123 Hybrid Battery Voltage Sensor "L" Circuit Low
      P0B79-123 Hybrid Battery Voltage Sensor "M" Circuit Low
      P0B7E-123 Hybrid Battery Voltage Sensor "N" Circuit Low
      P0B83-123 Hybrid Battery Voltage Sensor "O" Circuit Low
      P0B88-123 Hybrid Battery Voltage Sensor "P" Circuit Low
      P0B8D-123 Hybrid Battery Voltage Sensor "Q" Circuit Low
      P0B92-123 Hybrid Battery Voltage Sensor "R" Circuit Low
      P308A-123 Hybrid 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.


    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    C

    GO TO DTC CHART (HYBRID BATTERY SYSTEM) Click here

    A

    REPLACE BATTERY SMART UNIT Click here