How to relearn GM crankshaft position sensor variation guide?
IMPORTANT: After the ignition switch is turned to the CRANK position, the VCM must see a change in the state of brake switch (released to applied) to run the learn procedure. Also, the service brakes, and the parking brake must be held throughout the duration of the learn procedure. 4) Gradually accelerate engine to required RPM.
What does ” crank relearn ” mean on a GM engine?
“Crank relearn” refers to a GM service procedure that has to do with the calibration of the PCM to a specific engine’s crankshaft position sensor (CKP sensor). When your Gen III (LS1, etc) or Gen IV (LS2, etc) based car or truck was put together and factory-tested, one of the procedures it went through was the “crank learn” procedure.
When to do a crankshaft variation relearn?
Crankshaft Variation Relearn Procedure must be performed if: • ECC was reprogrammed. • Crankshaft position sensor has been replaced. • ECC has been replaced. Follow the relearn procedure outlined below: 1. Install scan tool on Data Link Connector (DLC) located under the dash. Apply parking brake and block wheels. Insure hood is closed. 2.
What are the instructions for Crank relearning?
Accelerate to 55 mph and cruise for 2 minutes. 7. Stop the vehicle and idle for 2 minutes with the brake applied and the transmission in Drive (automatic trans.) or Neutral (manual trans.) with the clutch depressed. We were unable to load Disqus.
What is crankshaft position?
The crank position sensor, sometimes referred to as the crankshaft position sensor, is a small plug found on motor vehicles that monitors the speed at which the crankshaft is rotating. This information is relayed through the vehicle’s computer, which then uses it to calculate ignition timing.
What is a bad crank sensor?
A bad crank position sensor can worsen the way the engine idles, or the acceleration behaviour. If the engine is revved up with a bad or faulty sensor, it may cause misfiring, motor vibration or backfires. Acceleration might be hesitant, and abnormal shaking during engine idle might occur.
Is crank sensor same as camshaft sensor?
Cam sensor and Crank sensor are not the same . The Cam sensor is mounted on the Cam shaft and Crank sensor on the crankshaft. Both are used to measure the engine rpm.
What does a crank position sensor do?
Typical inductive crankshaft position sensor. A crank sensor is an electronic device used in an internal combustion engine, both petrol and diesel, to monitor the position or rotational speed of the crankshaft.