Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Hybrid/EV Powertrain Control Module Unexpected Operation (P0A1D94)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Battery System / Hybrid/EV Powertrain Control Module Unexpected Operation (P0A1D94)

DESCRIPTION

The battery ECU assembly monitors the hybrid vehicle control ECU via CAN communication. If the battery ECU assembly detects that the hybrid vehicle control ECU is malfunctioning, it will illuminate the MIL and store a DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A1D94

Hybrid/EV Powertrain Control Module Unexpected Operation

Hybrid vehicle control ECU internal malfunction:

An abnormal signal from the hybrid vehicle control ECU is detected by the battery ECU assembly.

(1 trip detection logic)

Hybrid vehicle control ECU

Comes on

Master Warning:

Comes on

SAE Code: P0A1D

MONITOR DESCRIPTION

The battery ECU assembly monitors the hybrid vehicle control ECU via CAN communication. If the battery ECU assembly detects a malfunction in the hybrid vehicle control ECU, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0A1D (INF P0A1D94): Hybrid powertrain control module

Required sensors/components

Hybrid vehicle control ECU

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

Immediately

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 P0A1D (INF P0A1D94) 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 2 minutes or more.[*1]

    HINT:

    [*1]: Normal judgment procedure.

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

  7. Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
  8. 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.

CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click here

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

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU)

(a) Check the connections of the hybrid vehicle control ECU connector.

Click here

OK:

The connectors are connected securely and there are no contact problems.
NG

CONNECT SECURELY
OK

2.

CHECK CONNECTOR CONNECTION CONDITION (BATTERY ECU ASSEMBLY)

CAUTION:

Be sure to wear insulated gloves and protective goggles.

(a) 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.

(b) Check the connector connections and contact pressure of the relevant terminals for the battery ECU assembly.

Click here

OK:

The connector is connected securely and there are no contact problems.
OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

CONNECT SECURELY

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