Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Drive Motor "B" Control Module Unexpected Operation (P0A1C94)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / Drive Motor "B" Control Module Unexpected Operation (P0A1C94)

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU monitors the motor generator control ECU (MG ECU).

The cause of this malfunction may be the following:

Motor generator control ECU (MG ECU) internal malfunction
  • Motor generator control ECU (MG ECU) malfunction

DESCRIPTION

The hybrid vehicle control ECU monitors the motor generator control ECU (MG ECU) and stores this DTC when it detects a malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A1C94

Drive Motor "B" Control Module Unexpected Operation

The motor generator control ECU (MG ECU) value received by the hybrid vehicle control ECU differs from the expected value for a certain period of time.

(1 trip detection logic)

Inverter with converter assembly

Does not come on

Master Warning: Comes on

SAE Code: P0A1C

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

  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. Turn the ignition switch to ON and wait for 2 minutes or more.
  7. Enter the following menus: Powertrain / Hybrid Control / 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.

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

P0A1C94 only is output.

A

DTCs except P0A1C94 are output.

B

(b) Turn the ignition switch off.

A

REPLACE INVERTER WITH CONVERTER ASSEMBLY

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

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