Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026PY2
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): P1CAC49,P1C641F,P1CAF38; Generator Position Sensor Internal Electronic Failure; 2023 - 2025 MY Corolla HV [09/2022 -        ]

DTC

P1CAC49

Generator Position Sensor Internal Electronic Failure

DTC

P1C641F

Generator Control Module Circuit Intermittent

DTC

P1CAF38

Generator Position Sensor REF Signal Cycle Malfunction Signal Frequency Incorrect

DESCRIPTION

The motor generator control ECU (MG ECU), which is built into the inverter with converter assembly, monitors its internal operation and detects malfunctions.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P1C641F

Generator Control Module Circuit Intermittent

Excitation signal (REF signal) for resolver angle detection cycle malfunction detected when DTC P0C7917, P0E5717, P0D3319, P1C5D19, P1C5F19 or P1C5E19 is stored.

(1 trip detection logic)

  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Wire harness or connector
  • Rear traction motor with transaxle assembly*

Does not come on

Master Warning:

Does not come on

SAE Code:

P1C64

P1CAC49

Generator Position Sensor Internal Electronic Failure

Generator resolver angle malfunction:

The difference between the resolver angle for control and estimated resolver angle exceeds the allowable limit.

(1 trip detection logic)

  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Wire harness or connector
  • Rear traction motor with transaxle assembly*

Comes on

Master Warning:

Comes on

SAE Code:

P1CAC

P1CAF38

Generator Position Sensor REF Signal Cycle Malfunction Signal Frequency Incorrect

Resolver REF signal cycle malfunction:

Excitation signal (REF signal) for resolver angle detection cycle malfunction

(1 trip detection logic)

  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Wire harness or connector
  • Rear traction motor with transaxle assembly*

Comes on

Master Warning:

Comes on

SAE Code:

P1CAF

  • *: for 4WD

MONITOR DESCRIPTION

The motor generator control ECU performs diagnostic tests to verify proper operation of internal ECU systems. In this diagnostic monitor, the motor generator control ECU checks for an R/D (Resolver/Digital Converter) malfunction involving the generator resolver. If motor generator control ECU detects an R/D error, it will conclude that there is an internal malfunction involving the generator resolver. The motor generator control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P1CAC (INF P1CAC49): Generator Control Module R/D Processing (Generator Position) Performance

P1CAF (INF P1CAF38): Generator Position Sensor Reference Signal Performance

Required sensors/components

Generator resolver

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 P1CAC (INF P1CAC49) is not detected

DTC P1CAF (INF P1CAF38) 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 5 seconds or more.* [*1]

    *: Lightly wiggle the connectors and wire harnesses up and down and right and left.

  4. Turn the ignition switch to ON (READY) and wait for 5 seconds or more. [*2]
  5. Depress the accelerator pedal of the vehicle with the engine stopped and shift lever in P to start the engine. [*3]
  6. Keep the engine running for 5 seconds or more. [*4]
  7. Drive the vehicle forward with the shift lever in D for 5 m (16 ft.) or more. [*5]
  8. Drive the vehicle backward with the shift lever in R for 5 m (16 ft.) or more. [*6]

    HINT:

    [*1] to [*6]: 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 / Motor Generator / 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

for 2WD:
for 4WD:

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

HINT:

  • If the problem symptom cannot be reproduced, performing a road test on a road on which the vehicle tends to vibrate will make it easier to reproduce the symptom.
  • If the resolver is malfunctioning, the vehicle may not drive smoothly.
  • When inspecting the connectors, if it is difficult to judge if a connector was disconnected, deformed or improperly secured, disconnect and reconnect the connector and then check for DTCs again. Check if the same DTC is output. If the same DTC is not output, improper connection of connectors is suspected.
  • As a malfunction detection threshold may be exceeded when performing the vibration or heat connector inspections, make sure to perform the following inspection to check that the DTC was not stored due to the malfunction of a part.
  • P1CAC49, P1C641F and P1CAF38 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.)

System

Relevant DTC

Motor generator control system

P0A3F16

Drive Motor "A" Position Sensor Circuit Voltage Below Threshold

P0A4516

Drive Motor B" Position Sensor Circuit Voltage Below Threshold

P0A4B16

Generator Position Sensor Circuit Voltage Below Threshold

P0C6413

Generator Position Sensor Circuit "A" Circuit Open

P0C6416

Generator Position Sensor Circuit "A" Circuit Voltage Below Threshold

P0C6417

Generator Position Sensor Circuit "A" Circuit Voltage Above Threshold

P0C6913

Generator Position Sensor Circuit "B" Circuit Open

P0C6916

Generator Position Sensor Circuit "B" Circuit Voltage Below Threshold

P0C6917

Generator Position Sensor Circuit "B" Circuit Voltage Above Threshold

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 GENERATOR RESOLVER CIRCUIT

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

NEXT

3.

CHECK MOTOR RESOLVER CIRCUIT

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

NEXT

4.

CONFIRM VEHICLE SPECIFICATION

Result

Proceed to

for 2WD

A

for 4WD

B

A

REPLACE INVERTER WITH CONVERTER ASSEMBLY

B

5.

CHECK REAR MOTOR RESOLVER CIRCUIT

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): Rear Motor Resolver Circuit

NEXT

REPLACE INVERTER WITH CONVERTER ASSEMBLY