(d) Reconnect the mass air flow meter sub-assembly connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
OK -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal
From 08/2009
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0112,P0113: Intake Air Temperature Circuit Low Input
P0113 - Intake Air Temperature Circuit High Input
DESCRIPTION
- The intake air temperature sensor, in the mass air flow meter sub-assembly, 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
becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance drops. These variations in
resistance are transmitted to the ECM as voltage changes (see Fig. 1).
- The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R which is located inside the
ECM.
- Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor
changes, the voltage at terminal THA varies accordingly. Based on this signal, the ECM increases the fuel injection volume when the engine is
cold to improve driveability.
HINT
When any of DTCs P0112 and P0113 are set, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is
estimated to be 20锟斤拷C (68锟斤拷F) by the ECM. Fail-safe mode continues until a pass condition is detected.
HINT
When any of these DTCs are set, check the intake air temperature by entering the following menus on the Techstream:
Powertrain / Engine / Data List / Intake Air.
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