Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GCM4
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P1C8549; High Voltage Power Resource Internal Electronic Failure; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

P1C8549

High Voltage Power Resource Internal Electronic Failure

DESCRIPTION

The hybrid vehicle control ECU monitors the system internal operation, it will store a DTC and perform fail-safe control if it detects the following malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P1C8549

High Voltage Power Resource Internal Electronic Failure

Battery overcurrent or overload current occurs due to a malfunction in the high-voltage circuit between the hybrid system, HV battery and inverter.

(1 trip detection logic)
  • Hybrid vehicle control ECU
  • HV battery junction block assembly
  • Battery voltage sensor
  • Hybrid battery thermistor (wire harness or connector)
  • Wire harness or connector

Does not come on

Master Warning: Comes on

Related Data List

DTC No.

Data List

P1C8549
  • Hybrid/EV Battery Current
  • Hybrid/EV Battery Voltage
  • VL-Voltage before Boosting
  • VH-Voltage after Boosting

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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): UTILITY

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. Drive the vehicle for approximately 10 minutes according to the freeze frame data items "Vehicle Speed", "Accelerator Position" and "Hybrid/EV Battery Current".
  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 or N/A, perform driving pattern again.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0ABF11.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P0ABF11,P0ABF15,P1CBB12,P1CBB14; Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground+

CAUTION / NOTICE / HINT

CAUTION:

  • Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
    • Inspecting the high-voltage system
    • Disconnecting the low voltage connector of the inverter with converter assembly
    • Disconnecting the low voltage connector of the HV battery
  • To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
  • After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): PRECAUTION

    HINT:

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

    *a

    Without waiting for 10 minutes

NOTICE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

P1C8549 only is output.

A

DTCs other than P1C8549 is also output.

B

(e) Turn the power switch off.

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM) 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): DIAGNOSTIC TROUBLE CODE CHART 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK BATTERY VOLTAGE SENSOR (IGCT VOLTAGE)

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): U029A87; Lost Communication with Hybrid/EV Battery Sensor Module Missing Message+

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY VOLTAGE SENSOR POWER SOURCE CIRCUIT)
OK

3.

CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - HV BATTERY JUNCTION BLOCK 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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 HV battery cover panel RH.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HV BATTERY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

(c) Disconnect the z11 battery current sensor connector from the HV battery junction block assembly.

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

(d) Remove the No. 1 HV battery shield panel.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: BATTERY VOLTAGE SENSOR (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

(e) Disconnect the z10 battery voltage sensor connector.

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

(f) Measure the resistance according to the value(s) in the tables below.

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

z10-5 (IB0) - z11-4 (IB0)

Power switch off

Below 1 Ω

z10-12 (GIB) - z11-3 (GIB)

Power switch off

Below 1 Ω

z10-6 (VIB) - z11-1 (VIB)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

z10-5 (IB0) or z11-4 (IB0) - Body ground and other terminals

Power switch off

10 kΩ or higher

z10-12 (GIB) or z11-3 (GIB) - Body ground and other terminals

Power switch off

10 kΩ or higher

z10-6 (VIB) or z11-1 (VIB) - Body ground and other terminals

Power switch off

10 kΩ or higher

HINT:

As the battery harness is not available as a supply part, if the harness cannot be repaired, replace the HV battery.

*a

Rear view of wire harness connector

(to Battery Voltage Sensor)

*b

Front view of wire harness connector

(to HV Battery Junction Block Assembly (Battery Current Sensor))

(g) Reconnect the z10 battery voltage sensor connector.

(h) Install the No. 1 HV battery shield panel.

(i) Reconnect the z11 battery current sensor connector.

(j) Install the No. 1 HV battery cover panel RH.

NG

REPLACE HYBRID BATTERY THERMISTOR

OK

4.

CHECK BATTERY VOLTAGE SENSOR (VIB 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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 hybrid battery exhaust duct.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HV BATTERY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

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

(d) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z10-6 (VIB) - z10-12 (GIB)

Power switch on (IG)

4.6 to 5.4 V

NOTICE:

Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

*a

Component with harness connected

(Battery Voltage Sensor)

(f) Turn the power switch off.

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

(h) Install the No. 1 hybrid battery exhaust duct.

NG

GO TO STEP 7

OK

5.

CHECK BATTERY VOLTAGE SENSOR (GIB - GND)

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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 hybrid battery exhaust duct.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HV BATTERY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

(c) Disconnect the z10 and O33 battery voltage sensor connectors.

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z10-12 (GIB) - O33-5 (GND)

Power switch off

Below 1 Ω

*a

Component without harness connected

(Battery Voltage Sensor)

(e) Reconnect the z10 and O33 battery voltage sensor connectors.

(f) Install the No. 1 hybrid battery exhaust duct.

NG

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

OK

6.

CHECK HYBRID VEHICLE CONTROL ECU (HYBRID BATTERY CURRENT)

(a) Connect the GTS to the DLC3.

(b) Turn the power switch on (IG).

NOTICE:

During the inspection, make sure to only turn the power switch on (IG). Do not turn the power switch on (READY).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Hybrid/EV Battery Current, Hybrid/EV Battery Current for Hybrid/EV Battery Control.

Powertrain > Hybrid Control > Data List

Tester Display

Hybrid/EV Battery Current

Hybrid/EV Battery Current for Hybrid/EV Battery Control

(d) With the power switch on (IG), monitor Data List item "Hybrid/EV Battery Current" and "Hybrid/EV Battery Current for Hybrid/EV Battery Control" for 1 minute.

Result

Proceed to

The value of Data List item "Hybrid/EV Battery Current" and "Hybrid/EV Battery Current for Hybrid/EV Battery Control" is -0.5 A or less or 0.5 A or more.

A

Other than above

B

(e) Turn the power switch off.

A

REPLACE BATTERY VOLTAGE SENSOR

B

REPLACE HYBRID VEHICLE CONTROL ECU 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL

7.

CHECK BATTERY VOLTAGE SENSOR (VIB 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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 HV battery cover panel RH.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HV BATTERY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

(c) Disconnect the z11 battery current sensor connector from the HV battery junction block assembly.

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

(d) Remove the No. 1 hybrid battery exhaust duct.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HV BATTERY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

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

(f) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z10-6 (VIB) - z10-12 (GIB)

Power switch on (IG)

4.6 to 5.4 V

NOTICE:

Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

*a

Component with harness connected

(Battery Voltage Sensor)

(h) Turn the power switch off.

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

(j) Install the No. 1 hybrid battery exhaust duct.

(k) Reconnect the z11 battery current sensor connector.

(l) Install the No. 1 HV battery cover panel RH.

OK

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

NG

REPLACE BATTERY VOLTAGE SENSOR