Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001BGWJ |
Model Year Start: 2019 |
Model: Corolla Hatchback |
Prod Date Range: [06/2018 - 03/2019] |
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P012F62; Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure; 2019 - 2020 MY Corolla Corolla Hatchback [06/2018 - 03/2019] |
DTC
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P012F62
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Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure
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DESCRIPTION
The engine is equipped with an engine coolant temperature sensor and an engine oil temperature sensor. The engine coolant temperature sensor and engine oil temperature sensor each have a built-in thermistor. 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.
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Refer to DTC P011511 for the engine coolant temperature sensor.
Click here
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Refer to DTC P019511 for the engine oil temperature sensor (oil pressure and temperature sensor).
Click here
DTC No.
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Detection Item
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DTC Detection Condition
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Trouble Area
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MIL
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Memory
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Note
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P012F62
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Engine Coolant Temperature/Engine Oil Temperature Signal Compare Failure
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All of the following conditions are met (2 trip detection logic):
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The battery voltage is higher than 8 V.
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5 hours or more have elapsed since the engine stopped on the previous trip.
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The engine oil temperature is -10°C (14°F) or higher.
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The engine coolant temperature is -10°C (14°F) or higher.
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The difference between the readings of the engine coolant temperature and engine oil temperature is higher than 20 °C (36 °F).
|
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Engine coolant temperature sensor
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Oil pressure and temperature sensor (engine oil temperature sensor)
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ECM
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Comes on
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DTC stored
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SAE Code: P012F
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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. If the difference between the readings of the engine coolant temperature and engine oil temperature is higher than 20°C (36°F), the ECM determines that there is a malfunction in the engine coolant temperature sensor circuit or engine oil temperature sensor circuit, and stores a DTC and illuminates the MIL.
MONITOR STRATEGY
Related DTCs
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P012F: Engine coolant temperature sensor / Engine oil temperature sensor rationality
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Required Sensors/Components (Main)
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Engine coolant temperature sensor
Engine oil temperature sensor
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Required Sensors/Components (Related)
|
-
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Frequency of Operation
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Once per driving cycle
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Duration
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Within 60 seconds
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MIL Operation
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2 driving cycles
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Sequence of Operation
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None
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TYPICAL ENABLING CONDITIONS
All of the following conditions are met
|
-
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Arrive at after engine stop
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5 hours or more
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Engine coolant temperature
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-10°C (14°F) or higher
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Engine oil temperature
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-10°C (14°F) or higher
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Time after ECM started by soak timer
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0.5 seconds or more
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Engine switch
|
Off
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Battery voltage
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Higher than 8 V
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Engine coolant temperature sensor circuit fail (P0117, P0118)
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Not detected
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Engine oil temperature sensor circuit fail (P0197, P0198)
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Not detected
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Soak timer fail (P2610)
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Not detected
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TYPICAL MALFUNCTION THRESHOLDS
Deviated engine coolant temperature and engine oil temperature
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Less than -20 °C (-36 °F), or higher than 20 °C (36 °F)
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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
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When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
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Connect the Techstream to the DLC3.
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Turn the engine switch on (IG) [A].
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Turn the Techstream on.
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Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
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Turn the engine switch off.
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With the engine stopped, leave the vehicle as is for 5.5 hours or more [B].
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Turn the engine switch on (IG) [C].
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Turn the Techstream on.
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Enter the following menus: Powertrain / Engine / Trouble Codes [D].
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Read the pending DTCs.
HINT:
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If a pending DTC is output, the system is malfunctioning.
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If a pending DTC is not output, perform the following procedure.
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Enter the following menus: Powertrain / Engine / Utility / All Readiness.
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Input the DTC: P012F62.
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Check the DTC judgment result.
Techstream Display
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Description
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NORMAL
|
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DTC judgment completed
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System normal
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ABNORMAL
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-
DTC judgment completed
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System abnormal
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INCOMPLETE
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-
DTC judgment not completed
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Perform driving pattern after confirming DTC enabling conditions
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CAUTION / NOTICE / HINT
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.
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CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P012F62)
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(a) Connect the Techstream to the DLC3.
(b) Turn the engine 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
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DTC P012F62 is output
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A
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DTC P012F62 and other DTCs are output
|
B
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HINT:
If any DTCs other than P012F62 are output, troubleshoot those DTCs first.
(f) Record the freeze frame data.
A
|
|
|
2.
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CHECK FREEZE FRAME DATA (COOLANT TEMPERATURE AND INTAKE AIR TEMPERATURE)
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(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Using the Techstream, 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
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(e) Read the value displayed on the Techstream.
Standard:
Techstream Display
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Specified Condition
|
Difference between the Coolant Temperature and the Intake Air Temperature
|
Within 15°C (27°F)
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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.
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If the result is not as specified, check that there are no heat sources such as a block heater in the engine compartment.
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Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
Click here
OK
|
|
|
3.
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CHECK FREEZE FRAME DATA (ENGINE OIL TEMPERATURE SENSOR AND INTAKE AIR TEMPERATURE)
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Using the Techstream, 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
|
(e) Read the value displayed on the Techstream.
Standard:
Techstream Display
|
Specified Condition
|
Difference between the Engine Oil Temperature Sensor and the Intake Air Temperature
|
Within 15°C (27°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.
|