DTC P007A-11: Charge Air Cooler Temperature Sensor Bank 1 Circuit Short to Ground [11/2021 - ]: Description

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The intake air temperature sensor, built into the No. 1 turbo pressure sensor, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (See Fig. 1 above).

The intake air temperature sensor is powered by a 5 V supply from terminal THIM of the ECM, via resistor R.

Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes, according to changes in the intake air temperature, the voltage at terminal THIM also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.

HINT: 

When DTC P007A-11 is stored, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 45°C (113°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

HINT: 

When this DTC is output, check the intake air temperature (for No. 1 turbo pressure sensor) in the Data List. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temperature B1S1 (Turbo).

If the Data List values is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.