2001 Jimmy re-learn procedure

JJB9

MEMBER
2001 GMC JIMMY
6 CYL
4WD
AUTOMATIC
157,000 MILES

2001 GMC Jimmy had crankshaft position sensor replaced recently and now has the tach bouncing all over the place. Also skips and spits around 55 MPH.

Was told I need a "re-learn" procedure. Car has 157,000 and the mechanic does not think the car can take going 4000 RPM's.

Any ideas?

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Crankshaft Position (CKP) Sensor Variation Learn Procedure (2.2L & 4.3L)
Procedure must be performed if any of following have been done:
EEPROM was reprogrammed.
If CKP sensor was removed or replaced.
VCM was replaced.
Install scan tool. Apply parking brake. Block rear wheels. Ensure hood is closed.
Place transmission in Park (A/T models) or Neutral (M/T models). Start and warm engine until engine coolant temperature is at least 150°F (65°C). Ensure all accessories are off.
Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
Gradually accelerate engine to 4000 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut-off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, VCM will return engine control to operator and engine will respond to throttle position.
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.

If CKP sensor variation learn procedure was completed, turn ignition off for at least 15 seconds. Remove scan tool. If CKP sensor variation learn procedure was not completed, DTC P1336 will set. Perform diagnostic test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.