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 MANUALSCHEVROLET1996G 30 VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)TESTING AND INSPECTION
1996 Chevrolet G 30 Van V8-5.7L VIN R
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
1996 Chevrolet G 30 Van V8-5.7L VIN RSECTION Testing and Inspection
The scan tool displays engine coolant temperature in degrees. After engine start-up, the temperature should rise steadily to about 90°C (194°F) then stabilize when thermostat opens. If the engine has not been run for several hours (overnight), the engine coolant temperature and intake air temperature displays should be close to each other. When the VCM detects a malfunction in the Engine Coolant Temperature (ECT) sensor circuit, the following Diagnostic Trouble Code (DTC)s will set:
^ DTC P0117 circuit low.
^ DTC P0118 circuit high.
^ DTC P0125 excessive time to Closed Loop.
^ DTC P1114 circuit intermittent low.
^ DTC P1115 circuit intermittent high. The above DTCs contain a table to check for sensor resistance values relative to temperature.
Refer to Diagnostic Tables. Testing and Inspection
^ DTC P0117 circuit low.
^ DTC P0118 circuit high.
^ DTC P0125 excessive time to Closed Loop.
^ DTC P1114 circuit intermittent low.
^ DTC P1115 circuit intermittent high. The above DTCs contain a table to check for sensor resistance values relative to temperature.
Refer to Diagnostic 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.