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.

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.

When to run the CKP sensor variation relearn guide?

CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate. 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.

How to do a crank Relearn on a computer?

To perform the relearn, proceed as follows: Connect a scanner to make sure there are no trouble codes stored in the computer’s memory. If there is any power train trouble code other than P1336 (Crankshaft Position Variation not learned), the computer will disable the relearn function until the problem that caused the code has been eliminated.

How is the crankshaft position sensor related to the PCM?

This code is focused on the relationship between the crankshaft position sensor (CPS) and the engine controller (ECM/PCM). The PCM measures the variation between crankshaft position reference points. These measurements are compared to an ideal reference stored in the PCM. If the variation exceeds a calibrated percentage, a fault code is stored.

Are there any crank relearn instructions for cars?

These Crank Relearn Instructions may not apply to all vehicles. But they’re close to how it’s done on most cars. To perform the relearn, proceed as follows: Connect a scanner to make sure there are no trouble codes stored in the computer’s memory.

How to change the crankshaft position of a car?

1. Set the parking brake and block the drive wheels. Make sure that the hood is closed. 2. Start the engine and make sure that the engine coolant temperature is at least 158 degrees F. (70 degrees C.) 3. Turn the engine off for at least 10 seconds. 4. Select the crankshaft position variation learn procedure (CASE Learn)on your scanner. 5.

How to relearn the crankshaft variation relearned?

NOTE: If the Crankshaft Variation Relearn is not accessible through your scanner (some truck applications 1998 & later), perform the relearn in the following manner: 1. Turn off all of the accessories.

When to do a crankshaft variation relearn?