Toyota Corolla Cross: Control Module Internal Temperature Sensor/Intake Air Temperature Sensor Signal Compare Failure (P111C62)

DESCRIPTION

The engine has an ECM internal temperature sensor and intake air temperature sensor.

The resistance of a thermistor within the ECM internal temperature sensor and intake air temperature sensor increases as the temperature decreases and decreases as the temperature increases.

The voltage monitored by the ECM changes in accordance with the change in the resistance of the thermistor.

The ECM performs control based on these voltages.

HINT:

• Waiting is required to prevent the temperature of the engine from affecting the readings. If the engine has been operated recently, it is not possible to accurately compare the readings.
• For diagnosis, in order to duplicate the detection conditions of the DTC, it is necessary to park the vehicle for 7 hours. Parking the vehicle for 7 hours ensures that the actual temperature of the ECM internal temperature and intake air temperature (for mass airflow meter sub-assembly) are very similar. When the vehicle has been parked for less than 7 hours, differences in the readings may exist, but this does not necessarily indicate a fault.

MONITOR DESCRIPTION

6, 6.5 and 7 hours after the engine has stopped, the ECM monitors the voltage of the ECM internal temperature sensor and intake air temperature sensor.

If the difference between the readings of the ECM internal temperature and intake air temperature is more than 20°C (36°F), the ECM determines that there is a malfunction in the ECM internal temperature sensor circuit or intake air temperature sensor circuit and stores a DTC and illuminates the MIL.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

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.

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

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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 7.5 hours or more [B].
7. Turn the ignition switch to ON.
8. Turn the GTS on.
9. Wait 1 second [C].
10. Enter the following menus: Powertrain / Engine / Trouble Codes [D].
11. 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.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Input the DTC: P111C62.
14. 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

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

(a) Read the DTCs.

HINT:

If any DTCs other than P111C62 are output, troubleshoot those DTCs first.

(b) Record the freeze frame data.

B

GO TO DTC CHART

A

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

(b) Read the value displayed on the GTS.

Standard:

Difference between the Intake Air Temperature and the Ambient Temperature is within 15°C (27°F).

HINT:

• When the engine is cold, the value of the intake air temperature, ECM internal temperature and ambient temperature should be approximately the same.
• Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

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OK

REPLACE ECM

NG

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

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