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 MANUALSCHEVROLET1998ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIRCRANKSHAFT POSITION SYSTEM VARIATION LEARN PROCEDURE
1998 Chevrolet Astro Van 2WD V6-4.3L VIN W
Crankshaft Position System Variation Learn Procedure
1998 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Crankshaft Position System Variation Learn Procedure
1. Install the scan tool.
2. Apply the vehicle's parking brake.
3. Block the drive wheels.
4. Close the hood.
5. Place the vehicle's transmission in Park (A/T) or Neutral (M/T).
6. Idle the engine until the coolant temperature reaches 65°C (150°F).
7. Turn OFF all the accessories.
IMPORTANT: If the CKP System Variation Learn Procedure cannot be completed successfully, refer to Diagnostic Tables / Diagnostic Trouble Code Tables / DTC P1336 CKP System Variation Not Learned for additional diagnostic information.
8. Enable the Crankshaft Position System Variation Learn Procedure with the scan tool.
9. Apply the brakes for the duration of the procedure.
IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine will respond to throttle position after the learn procedure is complete.
10. Slowly raise the engine RPM to 4000 RPM.
11. Immediately release the throttle when the engine speed decreases.
12. Turn OFF the ignition for 15 seconds after the learn procedure is completed successfully.
2. Apply the vehicle's parking brake.
3. Block the drive wheels.
4. Close the hood.
5. Place the vehicle's transmission in Park (A/T) or Neutral (M/T).
6. Idle the engine until the coolant temperature reaches 65°C (150°F).
7. Turn OFF all the accessories.
IMPORTANT: If the CKP System Variation Learn Procedure cannot be completed successfully, refer to Diagnostic Tables / Diagnostic Trouble Code Tables / DTC P1336 CKP System Variation Not Learned for additional diagnostic information.
8. Enable the Crankshaft Position System Variation Learn Procedure with the scan tool.
9. Apply the brakes for the duration of the procedure.
IMPORTANT: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine will respond to throttle position after the learn procedure is complete.
10. Slowly raise the engine RPM to 4000 RPM.
11. Immediately release the throttle when the engine speed decreases.
12. Turn OFF the ignition for 15 seconds after the learn procedure is completed successfully.
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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.