Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Inverter "A" Cooling System Performance (P0A9300)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / Inverter "A" Cooling System Performance (P0A9300)

DTC SUMMARY

MALFUNCTION DESCRIPTION

This DTC indicates when the temperature sensor value inside the inverter has become abnormal. The cause of this malfunction may be one of the following:

Internal inverter malfunction
  • Inverter internal circuit malfunction
  • Malfunction in ECU that controls the inverter
  • Malfunction in sensor for inverter control (coolant temperature sensor)
Hybrid cooling system malfunction
  • Coolant is leaking, coolant level is insufficient, coolant is frozen or coolant passage is clogged.
  • Grille is blocked.

DESCRIPTION

Refer to the system description for the Cooling System.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A9300

Inverter "A" Cooling System Performance
  • Inverter coolant temperature increases as well as the temperature of any inverter with converter assembly related parts due to an inverter cooling system malfunction.
  • When the actual temperature of the inverter coolant is higher than the sensor value by a certain value or more and the actual temperature is high.

(1 trip detection logic)
  • Inverter cooling system
  • Inverter water pump assembly
  • Inverter with converter assembly
  • Cooling fan system
  • Wire harness or connector

Comes on

Master Warning:

Comes on

SAE Code:

P0A93

MONITOR DESCRIPTION

If the hybrid vehicle control ECU detects a malfunction of the inverter cooling system, the ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0A93 (INF P0A9300): HV cooling system malfunction

Required sensors/components

Water pump, radiator fan, inverter, 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 stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU

DTC P0A93 (INF P0A9300) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS 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 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. With ignition switch ON and wait for 5 seconds or more. [*1]
  7. Turn the ignition switch to ON (READY) and wait for 5 seconds or more. [*2]
  8. Perform a road test according to the freeze frame data item "Vehicle Speed" for approximately 10 minutes. [*3]

    NOTICE:

    As the state of charge of the HV battery voltage may be low after driving in fail-safe mode, it will automatically be charged for 5 to 10 minutes after repairs have been performed and turn the ignition switch to ON (READY).

    HINT:

    [*1] to [*3] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  9. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  10. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to the wiring diagram for Cooling System.

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CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

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NOTICE:

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here

  • When disconnecting and reconnecting the auxiliary battery

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

HINT:

  • P0A9300 may be output as a result of the malfunction indicated by the DTCs in table below.
    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.)
Table 1

Malfunction Content

System

Relevant DTC

Insulation malfunction

Hybrid Control System

P1C7C49

Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure

P1C7D49

Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure

P1C7E49

Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure

P1C7F49

Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure

P1C8049

Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure
Table 2

Malfunction Content

System

Relevant DTC

Sensor and actuator circuit malfunction

Hybrid Control System

P0C7396

Motor Electronics Coolant Pump "A" Component Internal Failure

P314A31

Motor Electronics Coolant Pump "A" No Signal

Motor Generator Control System

P0A0011

Motor Electronics Coolant Temperature Sensor Circuit Short to Ground

P0A0015

Motor Electronics Coolant Temperature Sensor Circuit Short to Battery or Open

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

Click here

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

2.

CHECK COOLING SYSTEM

Click here

HINT:

If the "Cooling System" inspection results are normal, perform the next step.

NEXT

REPLACE HV COOLANT

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