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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 12 (COMPUTER RELEARN PROCEDURES)GENERAL MOTORS (CARS)SATURNCRANKSHAFT LEARN PROCEDURE (2.2L)
1999 GMC Forward Control 5.7 R, Automatic
Crankshaft Learn Procedure (2.2L)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Crankshaft Learn Procedure (2.2L)
WARNING: This page does not describe the selected car, but rather 98 other vehicles, including the 2001 Saturn SW2, 2001 Saturn SL2, 2001 Saturn SL1, 2001 Saturn SL, and 2001 Saturn SC2. However, it is still accessible from the selected car via links, so may be relevant.
- The Powertrain Control Module (PCM) uses crankshaft velocity calculations to determine engine misfire and to operate engine misfire self-diagnostics. PCM must know precisely the variation between notches on the crankshaft. PCM contains crankshaft learn procedure which learns the variation between notches on crankshaft. The crankshaft learn procedure must be reset if PCM, crankshaft, or crankshaft position sensor are replaced.
- Start engine and allow engine to reach at least 158°F (70°C). Turn A/C off and place transmission in Park or Neutral. Using scan tool, perform CRANKSHAFT POSITION VARIATION LEARN. Accelerate engine to 4000 RPM. When fuel cut occurs, release throttle. PCM learns crankshaft as engine decelerates.
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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.