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 SYSTEMSCRANKSHAFT POSITION SENSORTESTING AND INSPECTION
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Crankshaft Position Sensor: Testing and Inspection
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Testing and Inspection
^ The scan tool scan tool displays crankshaft position sensor data as engine speed (RPM). An error in the crankshaft position sensor circuit should set a DTC P0336, P0337, P0338, or a P0339. The crankshaft position sensor provides a signal through the ignition control module which the VCM uses as reference to calculate RPM and crankshaft position.
^ Refer to DTC P0336 CKP Sensor Circuit Performance or DTC P0337 CKP Sensor Circuit Low Frequency or DTC P0338 CKP Sensor Circuit High Frequency or DTC P0339 CKP Sensor Circuit Intermittent. Testing and Inspection
^ Refer to DTC P0336 CKP Sensor Circuit Performance or DTC P0337 CKP Sensor Circuit Low Frequency or DTC P0338 CKP Sensor Circuit High Frequency or DTC P0339 CKP Sensor Circuit Intermittent. 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.