Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure (P012F62)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / M20a-fxs (engine Control) / Sfi System / Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure (P012F62)

DESCRIPTION

The engine is equipped with an engine coolant temperature sensor and an engine oil temperature sensor (engine oil pressure and temperature sensor). The engine coolant temperature sensor and engine oil temperature sensor (engine oil pressure and temperature sensor) each have a built-in thermistor. As the temperature decreases, the thermistor resistance increases and as the temperature increases, the thermistor resistance decreases. The voltages at the respective terminals of the ECM change in accordance with the changes in the resistance of the thermistors. The ECM performs control based on these voltages.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P012F62

Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure

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

  1. The auxiliary battery voltage is higher than 8 V.
  2. 5 hours or more have elapsed since the engine stopped on the previous trip.
  3. The engine oil temperature is -10°C (14°F) or higher.
  4. The engine coolant temperature is -10°C (14°F) or higher.
  5. The difference between the readings of the engine coolant temperature and engine oil temperature is higher than 20°C (68°F).
  • Engine coolant temperature sensor
  • Engine oil temperature sensor (engine oil pressure and temperature sensor)
  • ECM

Comes on

  • SAE Code: P012F
  • DTC for Mexico Models: Does not apply

MONITOR DESCRIPTION

After the engine has stopped for 5 hours or more, the ECM monitors the voltage of the engine coolant temperature sensor and engine oil temperature sensor (engine oil pressure and temperature sensor). If the difference between the readings of the engine coolant temperature and engine oil temperature is higher than 20°C (68°F), the ECM determines that there is a malfunction in the engine coolant temperature sensor circuit or engine oil temperature sensor (engine oil pressure and temperature sensor) circuit, and stores a DTC and illuminates the MIL.

MONITOR STRATEGY

Related DTCs

P012F: Engine coolant temperature sensor / Engine oil temperature sensor rationality

Required Sensors/Components (Main)

Engine coolant temperature sensor

Engine oil temperature sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle

Duration

Within 60 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All of the following conditions are met

-

Time after ignition switch off

5 hours or more

Engine coolant temperature

-10°C (14°F) or higher

Engine oil temperature

-10°C (14°F) or higher

Time after ECM started by soak timer

0.5 seconds or more

Ignition switch

Off

Auxiliary battery voltage

Higher than 8 V

Engine coolant temperature sensor circuit fail (P0117, P0118)

Not detected

Engine oil temperature sensor circuit fail (P0197, P0198)

Not detected

Soak timer fail (P2610)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

Deviated engine coolant temperature and engine oil temperature

Less than -20°C (-4°F), or higher than 20°C (68°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

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

    Click here

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON [A].
  3. Turn the GTS on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off.
  6. With the engine stopped, leave the vehicle as is for 5.5 hours or more [B].
  7. Turn the ignition switch to ON [C].
  8. Turn the GTS on.
  9. Enter the following menus: Powertrain / Engine / Trouble Codes [D].
  10. 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.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Input the DTC: P012F62.
  13. Check the DTC judgment result.

    GTS 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 assembly 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.

    Click here

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

    Click here

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, 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.

    Click here

HINT:

Read Freeze Frame Data using the GTS. 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 DTC P012F62)

(a) Read the DTCs and record the Freeze Frame Data.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P012F62 is output

A

DTC P012F62 and other DTCs are output

B

HINT:

If any DTCs other than P012F62 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

CHECK FREEZE FRAME DATA (COOLANT TEMPERATURE AND INTAKE AIR TEMPERATURE)

(a) Using the GTS, read the values displayed in the Freeze Frame Data recorded in step 1.

Powertrain > Engine > DTC(P012F62) > Freeze Frame Data

Tester Display

Coolant Temperature

Intake Air Temperature

(b) Read the value displayed on the GTS.

Standard:

GTS Display

Specified Condition

Difference between the Coolant Temperature and the Intake Air Temperature

Within 15°C (59°F)

HINT:

  • When the engine is cold, the value of the engine coolant temperature, engine oil temperature and intake air temperature should be approximately the same.
  • If the result is not as specified, check that there are no heat sources such as a block heater in the engine compartment.
  • Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

    Click here

NG

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

OK

3.

CHECK FREEZE FRAME DATA (ENGINE OIL TEMPERATURE SENSOR AND INTAKE AIR TEMPERATURE)

(a) Using the GTS, read the values displayed in the freeze frame data recorded in step 1.

Powertrain > Engine > DTC(P012F62) > Freeze Frame Data

Tester Display

Engine Oil Temperature Sensor

Intake Air Temperature

(b) Read the value displayed on the GTS.

Standard:

GTS Display

Specified Condition

Difference between the Engine Oil Temperature Sensor and the Intake Air Temperature

Within 15°C (59°F)

HINT:

When the engine is cold, the value of the engine coolant temperature, engine oil temperature and intake air temperature should be approximately the same.

OK

REPLACE ECM

NG

REPLACE ENGINE OIL TEMPERATURE SENSOR (ENGINE OIL PRESSURE AND TEMPERATURE SENSOR)

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