Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026PWU
Model Year Start: 2023 Model: Corolla HV Prod Date Range: [09/2022 -           ]
Title: HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0A1B1F; Generator Control Module Circuit Intermittent; 2023 - 2025 MY Corolla HV [09/2022 -        ]

DTC

P0A1B1F

Generator Control Module Circuit Intermittent

DESCRIPTION

If the motor generator control ECU, which is built into the inverter with converter assembly, is reset due to a problem with the power source in the inverter, the motor generator control ECU will store this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A1B1F

Generator Control Module Circuit Intermittent

Error in reset signal from the inverter assembly power source IC:

If internal power source voltage drops below the normal CPU operating voltage or the ROM/RAM is malfunctioning, the power source IC resets the MG ECU and stores this DTC.

(1 trip detection logic)

  • Wire harness or connector
  • Inverter with converter assembly
  • Auxiliary battery terminal

Comes on

Master Warning:

Comes on

SAE Code:

P0A1B

MONITOR DESCRIPTION

The motor generator control ECU monitors its internal operation and will illuminate the MIL and store a DTC if it detects a malfunction.

MONITOR STRATEGY

Related DTCs

P0A1B (INF P0A1B1F): Drive Motor "A" Control Module

Required sensors/components

Motor generator 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

Motor generator control ECU

DTC P0A1B (INF P0A1B1F) 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 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): UTILITY

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

    Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): DTC CHECK / CLEAR

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Turn the ignition switch to ON and wait for 15 seconds 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.

  4. Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.
  5. 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

CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): PRECAUTION

NOTICE:

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

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: BEFORE DISCONNECTING BATTERY

  • 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 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART

    • P0A1B1F 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.)

    Malfunction Content

    System

    Relevant DTC

    Communication malfunction

    Hybrid control system

    U011087

    Lost Communication with Drive Motor Control Module "A" Missing Message

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P033500,P033531; Crankshaft Position Sensor "A"+

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 AUXILIARY BATTERY TERMINAL (CONTACT PROBLEM)

(a) Check the connection of the auxiliary battery terminal.

OK:

The terminal is connected securely and there is no contact problem.

NG

CONNECT SECURELY

OK

3.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - IGCT-MAIN NO. 1 RELAY)

CAUTION:

Be sure to wear insulated gloves.

(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) Disconnect the inverter with converter assembly connector.

(c) Remove the IGCT-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A155-1 (IGC1) - 3 (IGCT-MAIN NO. 1 relay holder)

Ignition switch off

Below 1 Ω

A155-9 (IGC2) - 3 (IGCT-MAIN NO. 1 relay holder)

Ignition switch off

Below 1 Ω

A155-4 (GND1) - Body ground

Ignition switch off

Below 1 Ω

A155-12 (GND2) - Body ground

Ignition switch off

Below 1 Ω

(e) Install the IGCT relay.

(f) Reconnect the inverter with converter assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems.

HINT:

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

(1) Check the connection and terminal contact pressure of the connectors and wire harnesses between the auxiliary battery and the inverter with converter assembly.

There are no abnormalities in the wire harnesses and connectors.

OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY

NG

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA