DTC    P0A94-442    DC / DC Converter Performance

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DESCRIPTION

The boost converter boosts the 144 V DC from the HV battery to a maximum of approximately 520 V DC. The inverter converts the voltage that has been boosted by the boost converter into alternating current, which is used for driving generator and motor. When a motor generator operates as a generator, the alternating current that it creates is converted into direct current by the inverter. Then the boost converter drops this voltage to direct-current of approximately 144 V in order to charge the HV battery.

A105188E07

The MG ECU uses a voltage sensor (VL) that is built into the boost converter to detect the high voltage before it is boosted. It also uses a voltage sensor (VH) that is built into the inverter to detect the high voltage after it is boosted. Based on the voltage before and after it is boosted, the MG ECU controls the operation of the boost converter to boost the voltage to the target voltage.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0A94
442
Abnormal voltage execution value
Boosting cannot be performed as requested due to a boost converter system malfunction.
(1 trip detection logic)
Inverter with converter assembly

HINT:
With the vehicle stopped, apply the parking brake and turn the ignition switch ON (READY).
With the shift lever in P, depress the brake pedal firmly, and quickly and fully depress the accelerator pedal.
Immediately after the accelerator pedal is fully depressed, "VH-Voltage after boosting" will be between 400 and 500 V.

Related Data List 
DTC No.
Data List
P0A94-442
VH-Voltage after Boosting

MONITOR DESCRIPTION

If the difference between the requested boost converter voltage and the actual boost converter voltage exceeds a predetermined value, the MG ECU determines that there is a malfunction of the execution or monitoring in the boost converter voltage. The MG ECU will send information about the malfunction to the power management control ECU. Upon receiving this information, the power management control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY


Related DTCs
P0A94 (INF 442): Discrepancy between commanded and actual voltage
Required sensors / components
Boost converter
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 P0A94 (INF 442) is not detected

CONFIRMATION DRIVING PATTERN


A309990E02

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to 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 ignition switch off and wait for 30 seconds or more.
  5. Turn the ignition switch to ON (IG) and turn the Techstream on.
  6. Turn the ignition switch to ON (READY).
  7. With the engine stopped and the shift lever in P, depress the accelerator pedal to start the engine. [A]
  8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [B]
  9. Read the current DTCs.

    HINT:
    1. If a current DTC is output, the system is malfunctioning.
    2. If a current DTC is not output, perform the following procedure.
  10. Check that permanent DTCs are cleared. If no permanent DTC is output, the system is normal.
  11. If the permanent DTCs are not cleared, perform a universal trip, and then check for permanent DTCs again.

INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  2. After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work (Click here).

    HINT:
    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).

HINT:
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
  1. Turn the ignition switch to ON (READY).
  2. With the engine stopped and the shift lever in P, depress the accelerator pedal to start the engine.
1.CHECK DTC OUTPUT (HYBRID CONTROL)
  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON (IG).

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

  1. Check if DTCs are output.

    Result:
    Result
    Proceed to
    P0A94-442 only is output, or DTCs other than the ones in the table below are also output.
    A
    Any of the following DTCs are also output.
    B

    DTC No.
    Relevant Diagnosis
    P0A1A (all INF codes)*1
    Generator Control Module
    P0A1B (all INF codes)*1
    Drive Motor "A" Control Module
    P0A1D (all INF codes)*1
    Hybrid Powertrain Control Module
    P0A3F-243
    Drive Motor "A" Position Sensor Circuit
    P0A40-500
    Drive Motor "A" Position Sensor Circuit Range / Performance
    P0A41-245
    Drive Motor "A" Position Sensor Circuit Low
    P0A4B-253
    Generator Position Sensor Circuit
    P0A4C-513
    Generator Position Sensor Circuit Range / Performance
    P0A4D-255
    Generator Position Sensor Circuit Low
    P0A60 (all INF codes)*1
    Drive Motor "A" Phase V Current
    P0A63 (all INF codes)*1
    Drive Motor "A" Phase W Current
    P0A72 (all INF codes)*1
    Generator Phase V Current
    P0A75 (all INF codes)*1
    Generator Phase W Current
    P0A78-266, 267, 279, 287, 503, 504, 505, 506, 586, 806, 807, 808
    Drive Motor "A" Inverter Performance
    P0A7A-325, 517, 518, 809, 810, 811
    Generator Inverter Performance
    P0A90-509
    Drive Motor "A" Performance
    P0A92-521
    Hybrid Generator Performance
    P0A94-547, 548, 549, 554, 555, 556, 585, 587, 589, 590
    DC / DC Converter Performance
    P0C76-523
    Hybrid Battery System Discharge Time Too Long

    HINT:
    1. *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
    2. P0A94-442 may be set due to a malfunction which also causes DTCs in the preceding table to be set. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.
  1. Turn the ignition switch off.



B
GO TO DTC CHART (HYBRID CONTROL SYSTEM) (Click here)
A


2.CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

CAUTION:
Be sure to wear insulated gloves.
  1. Check that the service plug grip is not installed.

    NOTICE:
    After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.


    A267460
  1. Check the connector connections and contact pressure of the low voltage connectors of the inverter with converter assembly (Click here).

    NOTICE:
    Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

    OK:
    The connectors are connected securely and there are no contact pressure problems.

    HINT:
    When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.


NG
CONNECT SECURELY
OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY (Click here)