HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AFC-129

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

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 HV battery voltage circuit malfunction Battery smart unit

INSPECTION PROCEDURE

Note

Performing the check procedures for a long time with the shift lever in the N position 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. To confirm normal operation, compare the HV battery voltage (PWR RESOURCE VB), pre-boost voltage (VL), and post-boost voltage (VH) in the Data List with the power switch on (READY) and the shift lever in the N position. When the system is normal, the PWR RESOURCE VB, VL, and VH values should be almost equal (voltage boosting will not occur when the shift lever is in neutral). If the difference between each voltage exceeds the values specified below, there is a malfunction in the battery smart unit.

Inspection voltage Maximum voltage difference
Difference between HV battery voltage (PWR RESOURCE VB) and pre-boost voltage (VL) 40V or higher
Difference between HV battery voltage (PWR RESOURCE VB) and post-boost voltage (VH) 40V or higher
Difference between pre-boost voltage (VL) and post-boost voltage (VH) 50V or higher

PROCEDURE


  1. CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester 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. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0A1A-151, 155, 156, 658, 659 Generator Control Module
      P0A1B-164, 193, 661, 786 Drive Motor "A" Control Module
      P0A1D-148 Hybrid Powertrain Control Module
      P2511-149 HV CPU Power Relay Sense Circuit Intermittent No Continuity
      P324E-788 MG-ECU Power Relay Intermittent Circuit
      U0110 (all INF codes)*1 Lost Communication with Drive Motor Control Module "A"

      Tech Tips


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

      • P0AFC-129 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

    5. Turn the power switch off.


    B

    GO TO DTC CHART Click here

    A

    REPLACE BATTERY SMART UNIT Click here