Intake Air Temperature Sensor Check
TROUBLESHOOTING HINTSBecause the intake air temperature of the intake air in the air cleaner, it indicates a temperature different than the temperature of the outside air when the engine is running.
Note that the resistance of the intake air temperature sensor decreases when the temperature of the intake air increases.
- The intake air temperature sensor terminal voltage becomes higher when the resistance of the intake air temperature sensor increases, and becomes lower when the resistance decreases. Consequently, the intake air temperature sensor terminal voltage varies in accordance with the temperature of the intake air, becoming lower when the temperature of the intake air increases.
INSPECTION
Using Scan Tool
HARNESS INSPECTION
STEP 1. Check for continuity in the ground circuit.
- Volume air flow sensor connector: Disconnected
OK: GO TO STEP 2
NG: Repair the harness. (A5 - 92)
STEP 2. Check for an open or short-circuit between the intake air temperature sensor and the engine control module.
- Volume air flow sensor connector: Disconnected
- Engine control module connector: Disconnected
OK: GO TO STEP 3
NG: Repair the harness. (A6 - 72)
STEP 3. Measure the power supply voltage.
- Volume air flow sensor connector: Disconnected
- Ignition switch: ON
- Engine control module connector: Connected
Voltage (V): 4.5 - 4.9
OK: STOP
NG: Replace the engine control module.
*INTAKE AIR TEMPERATURE CHECK
(1) Disconnect the volume air flow sensor connectors.
(2) Measure the resistance between terminal (5) and terminal (6).
Standard value:
(3) Measure the resistance while heating the sensor using a hair drier.
(4) If resistance does not decrease as heat increases or the resistance remains unchanged, replace the volume air flow sensor assembly.