Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000026PU7
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): P1C8349; High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction; 2023 - 2025 MY Corolla HV [09/2022 -        ]

DTC

P1C8349

High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU monitors the high-voltage wiring between the HV battery and inverter with converter assembly and detects a power supply malfunction.

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

Inverter voltage sensor (VL) internal circuit malfunction

  • Voltage sensor (VL) malfunction
  • Motor generator control ECU (MG ECU) malfunction
  • Communication (wire harness) malfunction

High voltage system malfunction

  • HV battery malfunction
  • HV battery junction block assembly malfunction
  • Inverter with converter assembly malfunction
  • Air conditioner system malfunction
  • High-voltage wire harness malfunction
  • High-voltage connector or connection malfunction

Low-voltage circuit (12 V) malfunction

  • Hybrid vehicle control ECU malfunction
  • HV battery junction block assembly malfunction
  • Low voltage wire harness malfunction
  • Low voltage connector malfunction

INSPECTION DESCRIPTION

System Diagram Range

Inspection Content

Reason

*a

Check high-voltage wiring connection condition of the air conditioner compressor with motor assembly

Check for short circuit

*b

Check the high voltage cables between the HV battery junction block assembly

Check for open circuit and defective connection (arc marks) due to looseness

*c

Check connection condition and wire harness continuity between DC/DC converter and auxiliary Battery

Check for open circuit and defective connection (arc marks) due to looseness

*d

Check connection condition and wire harness continuity between DC/DC converter and hybrid vehicle control ECU

Check for open circuit and defective connection (arc marks) due to looseness

DESCRIPTION

Refer to the description for DTC P0AD911.

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0AD911; Hybrid/EV Battery Positive Contactor Circuit Short to Ground+

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P1C8349

High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction

Although an SMR on request was sent when the ignition switch is operated, the voltage did not increase after boosting.

High-voltage circuit malfunctions between the HV battery and inverter with converter assembly, or high-voltage cable has an open circuit.

(2 trip detection logic)
  • HV battery junction block assembly
  • HV floor under wire
  • Inverter with converter assembly
  • Compressor with motor assembly
  • HV battery
  • Wire harness or connector

Does not come on

Master Warning:

Comes on

SAE Code:

P3004

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 30 seconds or more.
  5. Turn the ignition switch to ON (READY) and wait for 30 seconds or more.
  6. Turn the ignition switch off and wait for 30 seconds or more.
  7. Turn the ignition switch to ON and turn the GTS on.
  8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  9. 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

Refer to the wiring diagram for DTC P0AA649.

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0AA649,...,P1C8049; Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure+

Refer to the wiring diagram for DTC P19E100.

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P19E100; DC/DC Converter System Performance+

Refer to the wiring diagram for the HV Battery High-voltage Line Circuit.

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): HV Battery High-voltage Line Circuit+

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

HINT:

  • P1C8349 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

Microcomputer malfunction

Hybrid control system

P0A1B49

Drive Motor "A" Control Module Internal Electronic Failure

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

P1C9E9F

Hybrid/EV System Reset Stuck Off

P060B49

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

Motor generator control system

P0A1B1F

Generator Control Module Circuit Intermittent

P0A1A47

Generator Control Module Watchdog / Safety μC Failure

P0A1A49

Generator Control Module Internal Electronic Failure

P1C2A1C

Generator A/D Converter Circuit Circuit Voltage Out of Range

P1C2A49

Generator A/D Converter Circuit Internal Electronic Failure

P313383

Communication Error from Generator to Drive Motor "A" Value of Signal Protection Calculation Incorrect

P313386

Communication Error from Generator to Drive Motor "A" Signal Invalid

Hybrid battery system

P060B49

Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure

P060687

Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message

P060A47

Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure

P060A87

Hybrid/EV Battery Energy Control Module Processor from Monitoring Processor Missing Message

P0E2D00

Hybrid/EV Battery Energy Control Module Hybrid/EV Battery Monitor Performance

Power source circuit malfunction

Motor generator control system

P06D61C

Generator Control Module Offset Power Circuit Voltage Out of Range

Communication system malfunction

Hybrid control system

U011187

Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message

U01BD87

Lost Communication with DC/DC Converter Control Module "C"

Motor generator control system

P313387

Communication Error from Generator to Drive Motor "A" Missing Message

Sensor and actuator circuit malfunction

Hybrid control system

P0AD915

Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open

P0AD911

Hybrid/EV Battery Positive Contactor Circuit Short to Ground

P0ADD15

Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open

P0ADD11

Hybrid/EV Battery Negative Contactor Circuit Short to Ground

P0B231C

Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range

P0ABF00

Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance

P0D2D1C

Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range

Hybrid battery system

P0ABF11

Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground

P0B0E11

Hybrid/EV Battery Current Sensor "B" Circuit Short to Ground

P0B0E15

Hybrid/EV Battery Current Sensor "B" Circuit Short to Auxiliary Battery or Open

P0ABF15

Hybrid/EV Battery Current Sensor "A" Circuit Short to Auxiliary Battery or Open

P301A1C

Hybrid Battery Stack 1 Cell Voltage Detection Voltage Out of Range

P1A001C

Hybrid Battery Stack 2 Cell Voltage Detection Voltage Out of Range

P1AFD1C

Flying Capacitor/Internal Control Module Hybrid/EV Battery Monitor Voltage Out of Range

P0ABF28

Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure

P0ABF2A

Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range

P1CBB12

Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Auxiliary Battery

P1CBB14

Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Ground or Open

P0B1362

Hybrid/EV Battery Current Sensor "A"/"B" Signal Compare Failure

Motor generator control system

P0D2D16

Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Below Threshold

P0D2D17

Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Above Threshold

System malfunction

Hybrid control system

P0C7600

Hybrid/EV Battery System Discharge Time Too Long

P0D2D1C

Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range

P0A1F94

Hybrid/EV Battery Energy Control Module Unexpected Operation

P1C8349

High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction

P1CCC49

DC/DC Converter Internal Electronic Failure

Motor generator control system

P0D2D16

Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Below Threshold

P0D2D17

Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Above Threshold

P1CB69E

Drive Motor "A" Inverter Voltage Sensor(VH) Stuck On

P0CA300

DC/DC Converter Step Up Voltage Performance

PROCEDURE

1.

CHECK FREEZE FRAME DATA (HYBRID CONTROL)

(a) Read the Freeze Frame Data of DTC P1C8349.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

All of the following conditions are met:

  • Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is 39 V or less.
  • Difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting" is more than 60 V.
  • Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" is more than 76 V.

A

All of the following conditions are met:

  • Difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting" is 39 V or less.
  • Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is more than 60 V.
  • Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" is more than 76 V.

Freeze Frame Data item "DC/DC Converter Unavailable Status" is ON.

Except above

B

(b) Turn the ignition switch off.

A

REPLACE INVERTER WITH CONVERTER ASSEMBLY

B

2.

CHECK COMPRESSOR WITH MOTOR ASSEMBLY

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 HV air conditioning wire from the inverter with converter assembly.

HINT:

Make sure that no foreign matter has entered or contaminated the HV air conditioning wire.

*A

for 2WD

*B

for 4WD

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

Standard Resistance:

for 2WD:

Tester Connection

(Tester Probe Polarity)

Condition

Specified Condition

X3-2 (ACPE) (Negative (-) probe) - X3-1 (ACPB) (Positive (+) probe)

Ignition switch off

100 kΩ or higher

Standard Resistance:

for 4WD:

Tester Connection

(Tester Probe Polarity)

Condition

Specified Condition

X4-2 (ACPE) (Negative (-) probe) - X4-1 (ACPB) (Positive (+) probe)

Ignition switch off

100 kΩ or higher

NOTICE:

  • Do not use a megohmmeter.
  • Read the resistance after the value has stabilized.
  • Be sure to inspect with connecting the tester probes to the tips of the terminal.

*A

for 2WD

*B

for 4WD

*a

HV Air Conditioning Wire

(Inverter with Converter Assembly Side)

(d) Reconnect the HV air conditioning wire.

NG

GO TO STEP 14

OK

3.

CHECK INVERTER WITH CONVERTER ASSEMBLY (HV FLOOR UNDER WIRE CONNECTION CONDITION)

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 bolts for the HV floor under wire are tightened to the specified torque, the HV floor under wire is connected securely, and there are no contact problems.

Specified Condition:

T = 8.0 N*m (82 kgf*cm, 71 in.*lbf)

(c) Disconnect the HV floor under wire from the inverter with converter assembly.

(d) Check for arc marks on the terminals for the HV floor under wire and inverter with converter assembly.

Result

Proceed to

The terminals are connected securely and there are no contact problems.

There are no arc marks.

A

The terminals are not connected securely and there is a contact problem.

There are arc marks.

B

The terminals are not connected securely and there is a contact problem.

There are no arc marks.

C

The terminals are connected securely and there are no contact problems.

There are arc marks.

B

(e) Reconnect the HV floor under wire.

B

REPLACE MALFUNCTIONING PARTS
C

CONNECT SECURELY
A

4.

CHECK HV BATTERY JUNCTION BLOCK ASSEMBLY (HV FLOOR UNDER WIRE CONNECTION CONDITION)

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 HV floor under wire is connected securely, and there are no contact problems.

(c) Disconnect the HV floor under wire connectors from the HV battery junction block assembly.

(d) Check for arc marks on the terminals of the HV floor under wire and the HV battery junction block assembly.

Result

Proceed to

The terminals are connected securely and there are no contact problems.

There are no arc marks.

A

The terminals are not connected securely and there is a contact problem.

There are arc marks.

B

The terminals are not connected securely and there is a contact problem.

There are no arc marks.

C

The terminals are connected securely and there are no contact problems.

There are arc marks.

B

(e) Reconnect the HV floor under wire connectors.

B

REPLACE MALFUNCTIONING PARTS
C

CONNECT SECURELY
A

5.

CHECK FLOOR UNDER WIRE

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 HV floor under wire connectors from the HV battery junction block assembly.

(c) Disconnect the HV floor under wire from the inverter with converter assembly.

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

*a

HV Floor Under Wire

(Inverter with Converter Assembly Side)

*b

HV Floor Under Wire

(HV Battery Junction Block Assembly Side)

Standard Resistance:

Tester Connection

Condition

Specified Condition

W4-1 (CBI) - W8-1 (CBI)

Ignition switch off

Below 1 Ω

W4-2 (CEI) - W7-1 (CEI)

Ignition switch off

Below 1 Ω

NOTICE:

Be sure not to damage or deform the terminal being inspected.

(e) Reconnect the HV floor under wire to the inverter with converter assembly.

(f) Reconnect the HV floor under wire connectors to the HV battery junction block assembly.

NG

REPLACE FLOOR UNDER WIRE

OK

6.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY 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 the connection condition of the low voltage connectors of the inverter with converter assembly and the contact pressure of each terminal. Check the terminals for deformation, and the connector for water and foreign matter.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE

NOTICE:

Before disconnecting the connector, confirm that it is properly connected by checking that the claws of the lock levers are engaged and that the connector cannot be pulled off.

OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connector.

Result:

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

HINT:

When connecting the connector, connect it with the lock levers raised. Rotate each lock lever downward and make sure that the connector is securely connected. When a lock lever is fully lowered, a click will be heard as its claw engages. After the click is heard, pull up on the connector to confirm that it is securely connected.
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

7.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

(a) Check the connection condition of the hybrid vehicle control ECU and the contact pressure of each terminal. Check the terminals for deformation, and the connector for water and foreign matter.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE

NOTICE:

Before disconnecting the connector, confirm that it is properly connected by checking that the claws of the lock levers are engaged and that the connector cannot be pulled off.

OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connector.

Result:

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

HINT:

When connecting the connector, connect it with the lock levers raised. Rotate each lock lever downward and make sure that the connector is securely connected. When a lock lever is fully lowered, a click will be heard as its claw engages. After the click is heard, pull up on the connector to confirm that it is securely connected.
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

8.

CHECK FUSE (DC/DC)

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

(b) Remove the DC/DC fuse from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

DC/DC fuse

Always

Below 1 Ω

(d) Install the DC/DC fuse.

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

NG

REPLACE FUSE (DC/DC)
OK

9.

CHECK AMD TERMINAL VOLTAGE

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

D4-1 (AMD) - Body ground

Ignition switch off

Same as auxiliary battery voltage

*1

AMD Terminal (Inverter with Converter Assembly Side)

*2

AMD Terminal (No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly Side)

*a

D4-1 (AMD)

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

CHECK AMD TERMINAL CONNECTION CONDITION

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 nuts for the AMD terminal are tightened to the specified torque, the AMD terminal is connected securely, and there are no contact problems.

Result:

Result

Proceed to

There are no arc marks.

The terminal is connected securely and there are no contact problems.

A

There are no arc marks.

The terminal is not connected securely and there is a contact problem.

B

There are arc marks.

-

C

*1

AMD Terminal (Inverter with Converter Assembly Side)

*2

AMD Terminal (No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly Side)
B

CONNECT SECURELY
C

REPLACE MALFUNCTIONING PARTS
A

11.

CHECK GROUND WIRE CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY)

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: INSTALLATION

OK:

The ground wire is securely installed.

NG

CONNECT SECURELY
OK

12.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

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) Disconnect the hybrid vehicle control ECU connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

A156-5 (CNH) - I3-9 (CA4H)

Ignition switch off

Below 1 Ω

A156-4 (CNL) - I3-22 (CA4L)

Ignition switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A156-5 (CNH) or I3-9 (CA4H) - Body ground and other terminals

Ignition switch off

10 kΩ or higher

A156-4 (CNL) or I3-22 (CA4L) - Body ground and other terminals

Ignition switch off

10 kΩ or higher

(e) Reconnect the hybrid vehicle control ECU connector.

(f) Reconnect the inverter with converter assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

INSPECT HYBRID VEHICLE CONTROL ECU

(a) Disconnect the hybrid vehicle control ECU connector.

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

*a

Component without harness connected

(Hybrid Vehicle Control ECU)

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

I3-9 (CA4H) - I3-22 (CA4L)

Ignition switch off

80 to 170 Ω

(c) Reconnect the hybrid vehicle control ECU connector.

OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY

NG

REPLACE HYBRID VEHICLE CONTROL ECU

14.

CHECK HV AIR CONDITIONING WIRE

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 HV air conditioning wire from the inverter with converter assembly.

HINT:

Make sure that no foreign matter has entered or contaminated the HV air conditioning wire.

*A

for 2WD

*B

for 4WD

(c) Disconnect the HV air conditioning wire connector from the compressor with motor assembly.

HINT:

Make sure that no foreign matter has entered or contaminated the HV air conditioning wire.

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

Standard Resistance:

for 2WD:

Tester Connection

Condition

Specified Condition

X3-2 (ACPE) - X3-1 (ACPB)

Ignition switch off

10 kΩ or higher

for 4WD:

Tester Connection

Condition

Specified Condition

X4-2 (ACPE) - X4-1 (ACPB)

Ignition switch off

10 kΩ or higher

NOTICE:

Be sure to inspect with connecting the tester probes to the tips of the terminal.

*A

for 2WD

*B

for 4WD

*a

HV Air Conditioning Wire

(Inverter with Converter Assembly Side)

(e) Reconnect the HV air conditioning wire to the inverter with converter assembly.

(f) Reconnect the HV air conditioning wire connector to the compressor with motor assembly.

OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; HEATING / AIR CONDITIONING: COMPRESSOR (for 2ZR-FXE): REMOVAL 2023 - 2025 MY Corolla Corolla HV [11/2022 -        ]; HEATING / AIR CONDITIONING: COMPRESSOR (for 2ZR-FXE): REMOVAL

NG

REPLACE HV AIR CONDITIONING WIRE