Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026PV8
Model Year Start: 2023 Model: Corolla HV Prod Date Range: [09/2022 -           ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0A0A13,P0A0A92; High Voltage System Interlock Circuit Open; 2023 - 2025 MY Corolla HV [09/2022 -        ]

DTC

P0A0A13

High Voltage System Interlock Circuit Open

DTC

P0A0A92

High Voltage System Interlock Performance or Incorrect Operation

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU detects that a safety device (interlock) is operated or that there is an open circuit in the detection circuit. (Even if an open circuit occurs while the vehicle is stopped, the system determines that the safety device was operated.)

The cause of this malfunction may be one of the following:

Detection switch system malfunction

  • Service plug malfunction

Low-voltage system malfunction

  • Hybrid vehicle control ECU malfunction
  • Service plug malfunction
  • Wire harness malfunction
  • Connector malfunction

INSPECTION DESCRIPTION

System Diagram Location

Inspection Content

Reason

*a
  • Check whether the safety device (interlock) is connected securely and installed properly (service plug grip, etc.).
  • Check the connection condition of the hybrid vehicle control ECU connector.

DTC output due to improper connection or forgetting to install parts.

*b

Inspect the detection circuit.

DTC output due to an open circuit or improper connection (dirt, foreign matter, etc.).

DESCRIPTION

When the hybrid vehicle control ECU detects that a safety device (interlock) is operated, such as when the service plug grip or inverter cover is removed, it will prohibit hybrid system operation or shut off the system main relay. The 2 safety devices are located as follows; 1 in the service plug grip, 1 on the inverter cover for the terminals of the inverter with converter assembly motor cable and generator cable, that is connected to the inverter with converter assembly. If the service plug grip, inverter cover is removed, the interlock signal line will be open. If the vehicle is being driven, this condition will be determined to be an open circuit and the system main relays will not be shut off. When the safety devices are re-installed correctly, the system will return to normal when the ignition switch is turned to ON.

The system main relay will be turned off from the next trip after the open is detected until the condition returns to normal.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A0A13

High Voltage System Interlock Circuit Open

Interlock signal line opens while the vehicle is being driven (at 5 km/h (3 mph) or more)

(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
  • Service plug grip

Does not come on

Master Warning:

Comes on

SAE Code:

P0A0D

P0A0A92

High Voltage System Interlock Performance or Incorrect Operation

Either of the following conditions is met:

  • With the vehicle stopped, the service plug grip with a safety device was removed.
  • With the vehicle stopped, the interlock signal line became open.

(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
  • Service plug grip

Does not come on

Master Warning:

Comes on

SAE Code:

P0A0D

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: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): UTILITY

  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.
  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 driving pattern 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: HYBRID 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

  • 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.
  • As interlock circuit DTCs or other DTCs may be stored when the ignition switch is turned to ON in the following procedure, make sure to clear the DTCs after inspection.

HINT:

  • P0A0A13 or P0A0A92 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

Relevant DTC

Microcomputer malfunction

P060647

Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure

P060687

Hybrid/EV Powertrain Control Module Processor to Monitoring Processor Missing Message

P060A47

Hybrid/EV Powertrain Control Module Monitoring Processor Watchdog / Safety MCU Failure

P060A87

Hybrid/EV Powertrain Control Module Processor from Monitoring Processor Missing Message

P060B49

Hybrid/EV Powertrain Control Module A/D Processing Internal Electronic Failure

P060B71

Hybrid/EV Powertrain Control Module A/D Processing Actuator Stuck

P060B1C

Hybrid/EV Powertrain Control Module A/D Processing Voltage Out of Range

P1CE349

Hybrid/EV Powertrain Control Module Monitoring Processor A/D Processing Internal Electronic Failure

P1CE371

Hybrid/EV Powertrain Control Module Monitoring Processor A/D Processing Actuator Stuck

P1CE31C

Hybrid/EV Powertrain Control Module Monitoring Processor A/D Processing Voltage Out of Range

P060A45

Hybrid/EV Powertrain Control Module Monitoring Processor Program Memory Failure

P060A44

Hybrid/EV Powertrain Control Module Monitoring Processor Data Memory Failure

P060A29

Hybrid/EV Powertrain Control Module Monitoring Processor Signal Invalid

P060A49

Hybrid/EV Powertrain Control Module Monitoring Processor Internal Electronic Failure

Power source circuit malfunction

P06881F

ECM/PCM Power Relay Sense Circuit Intermittent

System malfunction

P1C9E9F

Hybrid/EV System Reset Stuck Off

PROCEDURE

1.

CLEAR DTC

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P06881F; ECM/PCM Power Relay Sense Circuit Intermittent+

NEXT

2.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Check if DTCs are output.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

P0A0A13 or P0A0A92 is output again.

A

Neither P0A0A13 or P0A0A92 is output again.

B

(b) Turn the ignition switch off.

B

GO TO STEP 9

A

3.

CHECK SERVICE PLUG GRIP

CAUTION:

Be sure to wear insulated gloves.

(a) Check if the service plug grip is installed correctly.

NOTICE:

Insert the service plug grip until a click sound is heard.

HINT:

  • For the removal and installation procedures.

    Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: SERVICE PLUG GRIP: REMOVAL

  • P0A0A92 is also set if the ignition switch is turned to ON with the service plug grip removed. Confirm the conditions when the malfunction occurred.

*1

Service Plug Grip
NG

INSTALL PARTS CORRECTLY
OK

4.

CHECK CONNECTOR CONNECTION CONDITION (INTERLOCK CONNECTOR)

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) Check that the interlock connector at the service plug grip installation socket is connected correctly.

OK:

The connector is connected correctly.

*1

Interlock Connector
NG

INSTALL PARTS CORRECTLY
OK

5.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P056014; System Voltage (BATT) Circuit Short to Ground or Open+

NG

CONNECT SECURELY
OK

6.

CHECK HYBRID VEHICLE CONTROL ECU

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 service plug grip (interlock switch) connector.

(c) Connect the cable to the negative (-) auxiliary battery terminal.

(d) Turn the ignition switch to ON.

(e) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

O37-1 (ILK) - Body ground

Ignition switch ON

11 to 14 V

NOTICE:

Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

*a

Rear view of wire harness connector

(to Service Plug Grip (Interlock Switch))

(f) Turn the ignition switch off.

(g) Disconnect the cable from the negative (-) auxiliary battery terminal.

(h) Reconnect the service plug grip (interlock switch) connector.

NG

GO TO STEP 10

OK

7.

CHECK SERVICE PLUG GRIP

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the service plug grip.

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: SERVICE PLUG GRIP: REMOVAL

(b) Check the condition of the service plug grip interlock.

OK:

Dirt or foreign matter has not entered the connectors, and there is no evidence of contamination.

*1

Service Plug Grip
NG

REPLACE SERVICE PLUG GRIP

OK

8.

CHECK HARNESS AND CONNECTOR (SERVICE PLUG GRIP - BODY GROUND)

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 service plug grip (interlock switch) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O37-2 (GND) - Body ground

Ignition switch off

Below 1 Ω

*a

Rear view of wire harness connector

(to Service Plug Grip (Interlock Switch))

(d) Reconnect the service plug grip (interlock switch) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK CONNECTOR CONNECTION CONDITION (INTERLOCK CIRCUIT)

(a) Check the connections of each connector.

OK:

Dirt or foreign matter has not entered the connectors, and there is no evidence of contamination.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE CONNECTOR

10.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - SERVICE PLUG GRIP)

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 hybrid vehicle control ECU connector.

(c) Disconnect the service plug grip (interlock switch) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I3-32 (ILK) - O37-1 (ILK)

Ignition switch off

Below 1 Ω

(e) Reconnect the service plug grip (interlock switch) connector.

(f) Reconnect the hybrid vehicle control ECU connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR