Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1998EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR TEMPERATURE SENSOR ( AMBIENT / INTAKE )TESTING AND INSPECTION
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Testing and Inspection
The scan tool displays the temperature of the air entering the engine, which should read close to the ambient air temperature when the engine is cold. The temperature should rise as the underhood temperature increases. If the engine has not been run for several hours (overnight), the IAT sensor temperature and the engine coolant temperature should read close to each other. If the VCM detects a malfunction in the IAT sensor circuit, the following DTCs will set:
^ DTC P0112 circuit low
^ DTC P0113 circuit high
^ DTC P0111 circuit intermittent high
^ DTC P1112 circuit intermittent low
Refer to Diagnostic Trouble Code Tables Testing and Inspection
^ DTC P0112 circuit low
^ DTC P0113 circuit high
^ DTC P0111 circuit intermittent high
^ DTC P1112 circuit intermittent low
Refer to Diagnostic Trouble Code Tables Testing and Inspection
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.