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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSATURN1998SL2 L4-1.9L DOHC VIN 7REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCRANKSHAFT POSITION SENSORSERVICE AND REPAIRRELEARN PROCEDURE
1998 Saturn SL2 L4-1.9L DOHC VIN 7
Relearn Procedure
1998 Saturn SL2 L4-1.9L DOHC VIN 7SECTION Relearn Procedure
CRANKSHAFT LEARN
The PCM uses crankshaft velocity calculations to determine misfire and run misfire self-diagnostics. The PCM must know precisely the variability in crankshaft notches for this function. The PCM has a "notch learn" process that learns the variability between notches which must be reset if the crankshaft in the engine is replaced. With use of the SSS, the crankshaft learn procedure can be set to relearn.
NOTE:
^ Do not transfer PCM's from one vehicle to another. The learned crankshaft notches will be different from one vehicle to another.
^ Anytime a replacement PCM is installed the PCM must relearn the crankshaft notches.
CRANKSHAFT RELEARN PROCEDURE
When a replacement PCM is installed, or the crankshaft or engine has been replaced, follow these procedures to relearn the crankshaft notches:
1. Allow the engine to idle until the SERVICE telltale flashes.
2. Hold rpm level to 3000 rpm until lamp goes Off (approx 10-20 seconds).
NOTE:
^ This procedure will not be initiated if any misfire is detected. If misfire codes are present refer to the appropriate Misfire trouble codes prior to attempting to relearn crankshaft notches.
^ If the Scan tool or service stall system are used to "reset" the crank shaft learn, the ignition will have to be cycled off for 10 seconds to correctly initiate the process.
The PCM uses crankshaft velocity calculations to determine misfire and run misfire self-diagnostics. The PCM must know precisely the variability in crankshaft notches for this function. The PCM has a "notch learn" process that learns the variability between notches which must be reset if the crankshaft in the engine is replaced. With use of the SSS, the crankshaft learn procedure can be set to relearn.
NOTE:
^ Do not transfer PCM's from one vehicle to another. The learned crankshaft notches will be different from one vehicle to another.
^ Anytime a replacement PCM is installed the PCM must relearn the crankshaft notches.
CRANKSHAFT RELEARN PROCEDURE
When a replacement PCM is installed, or the crankshaft or engine has been replaced, follow these procedures to relearn the crankshaft notches:
1. Allow the engine to idle until the SERVICE telltale flashes.
2. Hold rpm level to 3000 rpm until lamp goes Off (approx 10-20 seconds).
NOTE:
^ This procedure will not be initiated if any misfire is detected. If misfire codes are present refer to the appropriate Misfire trouble codes prior to attempting to relearn crankshaft notches.
^ If the Scan tool or service stall system are used to "reset" the crank shaft learn, the ignition will have to be cycled off for 10 seconds to correctly initiate the process.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.