Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001NLK1
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 - 09/2022]
Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P00B162; Radiator Coolant Temperature Sensor Signal Compare Failure; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

DTC

P00B162

Radiator Coolant Temperature Sensor Signal Compare Failure

DESCRIPTION

This engine uses a No. 2 engine coolant temperature sensor and an intake air temperature sensor to detect temperatures related to engine operation. A thermistor, whose resistance value varies according to the temperature, is built into each sensor. When the temperature becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance decreases. These variations in resistance are transmitted to the ECM as voltage changes.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P00B162

Radiator Coolant Temperature Sensor Signal Compare Failure

All of the following conditions are met (2 trip detection logic):

  1. The auxiliary battery voltage is 10.5 V or higher.
  2. 7 hours or more have elapsed since the power switch was turned off in the previous trip.
  3. Less than 20 seconds since a cold engine start was performed.
  4. The intake air temperature is -10°C (14°F) or higher.
  5. The difference between the readings of the No. 2 engine coolant temperature and intake air temperature is higher than 25°C (45°F).
  • Intake air temperature sensor (mass air flow meter sub-assembly)
  • No. 2 engine coolant temperature sensor
  • ECM

Comes on

DTC stored

  • SAE Code: P00B2
  • DTC for Mexico Models: Does not apply

MONITOR DESCRIPTION

The ECM monitors the difference between the No. 2 engine coolant temperature and the intake air temperature when the engine is started cold to accurately detect the engine temperature conditions. The monitor runs when the engine is started after 7 hours or more have elapsed since the power switch was turned off in the previous trip. If the difference between the engine coolant temperature and the intake air temperature on a cold start exceeds 25°C (45°F), the ECM interprets this as a malfunction in the No. 2 engine coolant temperature sensor circuit or intake air temperature sensor circuit, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

P00B2: No. 2 engine coolant temperature sensor rationality

Required Sensors/Components (Main)

No. 2 engine coolant temperature sensor

Intake air temperature sensor (mass air flow meter sub-assembly)

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle

Duration

15 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All of the following conditions are met

-

Soak time

7 hours or more

Auxiliary battery voltage

10.5 V or higher

Time after engine start

Less than 20 seconds

Intake air temperature at hybrid system ready-to-drive

-10°C (14°F) or higher

Intake air temperature sensor circuit fail (P0112, P0113)

Not detected

No. 2 engine coolant temperature sensor circuit fail (P00B3, P00B4)

Not detected

Soak timer fail (P2610)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

Deviated No. 2 engine coolant temperature and intake air temperature

Less than -25°C (-45°F), or higher than 25°C (45°F)

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]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

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

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) [A].
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off.
  6. With the engine stopped, leave the vehicle as is for 7.5 hours or more [B].
  7. Turn the power switch on (IG).
  8. Turn the Techstream on.
  9. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  10. Start the engine and wait 20 seconds or more [C].
  11. Enter the following menus: Powertrain / Engine / Trouble Codes [D].
  12. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  14. Input the DTC: P00B162.
  15. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • If the judgment result is INCOMPLETE, perform steps [B] through [D] again.
    • [B] to [D]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

  • Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

    - for Nickel Metal Hydride Battery: Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY

    - for Lithium-ion Battery: Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): VEHICLE CONTROL HISTORY

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    - for Nickel Metal Hydride Battery: Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY

    - for Lithium-ion Battery: Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): VEHICLE CONTROL HISTORY

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P00B162)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P00B162 is output

A

DTC P00B162 and P011B62 are output

B

DTC P00B162 and other DTCs are output

C

HINT:

  • If any DTCs other than P00B162 are output, troubleshoot those DTCs first.
  • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

B

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

C

GO TO DTC CHART

A

2.

INSPECT NO. 2 ENGINE COOLANT TEMPERATURE SENSOR

(a) Inspect the No. 2 engine coolant temperature sensor.

Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (ENGINE CONTROL): ENGINE COOLANT TEMPERATURE SENSOR: INSPECTION

OK

REPLACE ECM

NG

REPLACE NO. 2 ENGINE COOLANT TEMPERATURE SENSOR