Crankshaft Position Sensor Replacement 2000 to 2005
Caution: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.
- Raise and support the vehicle.
- Remove the crankshaft sensor electrical connector. For specific CKP sensor identification, refer to CKP, EOL, EOP comploc - 2000 K .
- Remove the crankshaft retaining bolt.
- Remove the crankshaft sensor.
Important: Inspect the crankshaft sensor o-ring for wear or damage. If a problem is found, replace the o-ring.
Lubricate the crankshaft sensor o-ring with clean engine oil.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Important: Be sure to fully seat the CKP sensor into the engine block. Failure to fully seat the CKP sensor may cause a CKP sensor DTC to set.
Install the crankshaft sensor and the retaining bolt.
Tighten the retaining bolt between 8-11N·m (70-100 lb in).
- Install the crankshaft sensor electrical connector.
- Caution: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.
- Lower the vehicle.
- Operate the engine and inspect crankshaft sensor for engine oil leaks.
- Perform the CKP System Variation Learn Procedure .
That is the way GM says to do it. Now this is my way.
Raise the car on the hoist
Remove the Front Air Deflector
Remove the bolt retaining the brake line bracket to the front of the cradle
Remove the front engine mount lower bolt.
Remove both of the front cradle bolts.
Un-clip the harness from the oil filter housing
Reach up to and un-clip the reddish connector locks on each connector. I use a hook shaped pick tool.
Un-clip both connectors from the crank sensors and move them to the side.
Use a 1/4 drive 10mm flex socket and a long extension and remove the retaining bolts.
Pull out both sensors.
Slide in the new crank sensors.
Bolt them in place
Reconnect the connectors and install the locks.
Re-clip the harness in place
Reinstall the cradle bolts and the motor mount nut.
Reinstall the brake line retainer bolt
Reinstall the front air deflector
Allow the engine to warm up to operating temp.
Relearn Crank Variance
If you do not have a hoist and you are using ramps and if you have small arms you may be able to reach up and un-clip the sensors, But I would say to take it to the dealer because you need to have the Crank Variance relearned any way
Crankshaft Position System Variation Learn
Caution: Before performing the Crankshaft Position System Variation Learning Procedure always set the vehicle parking brake and block the drive wheels in order to prevent personal injury. Release the throttle immediately when the engine starts to decelerate in order to eliminate over revving the engine. Once the learn procedure is completed, the control module will return engine control to the operator and the engine will respond to the throttle position.
- Set the parking brake.
- Block the drive wheels.
- Ensure the hood is closed.
- With the scan tool, monitor for DTCs. If a DTC is set, refer to Diagnostic Trouble Code (DTC) List/Type before proceeding.
- Start the engine and allow engine coolant temperature to reach at least 70°C (158°F).
- Turn OFF the ignition.
- Select and enable the crankshaft position variation learn procedure with the scan tool.
- Start the vehicle.
- Apply and hold the service brake pedal firmly.
- Ensure the transaxle is in park.
- Increase accelerator pedal position until the fuel cutoff is reached at 5150 RPM. Immediately release the accelerator pedal after fuel cutoff is reached.
- The crankshaft position system variation compensating values are learned when the RPM decreases back to idle. If the procedure terminates.
- Observe DTC status for DTC P1336.
- If the scan tool indicates that DTC P1336 ran and passed, the crankshaft position system variation learn procedure is complete. If the scan tool indicates DTC P1336 failed or not ran, check for other DTCs. If no DTCs other than P1336 are set, repeat the crankshaft position system variation learn procedure as necessary.
FIGURE CKP B, CKP A, Engine Oil Pressure Switch, and Engine Oil Level Switch(c)
(1) CKP Sensor B
(2) CKP Sensor A
(3) Engine Oil Pressure Switch
(4) Engine Oil Level Switch
:confused: AJ......What would happen if you replaced the sensors but did not perform the variance relearn ???
DTC P1336 Crankshaft Position (CKP) System Variation Not Learned
The crankshaft position system variation learning feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the crankshaft position sensors. The calculated error allows the PCM to accurately compensate for reference period varations. This enhances the ability of the PCM to detect misfire events over a wider range of engine speed and load.
The PCM stores the crankshaft position system variation values after a learn procedure has been performed. DTC 1336 set indicates that the crankshaft position system variation values have not been stored in the PCM and the crankshaft position system variation learn procedure must be performed. The learn procedure is required after the following service procedures have been performed, regardless of whether or not DTC P1336 is set:
Crankshaft position sensor replacement.
Any engine repair that disturbs crankshaft to crankshaft position sensor relationship.
Conditions for Running the DTC
No CMP sensor, or CKP sensor DTCs set.
The engine coolant temperature is more than 70°C (158°F).
Conditions for Setting the DTC
The crankshaft position system variation values are not stored in the PCM memory.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp (MIL) the first time the malfunction is detected.
The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool Clear DTC Information function.
The crankshaft position system variation compensating values are stored in PCM memory after a learn procedure has been performed. If the actual crankshaft position variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set (refer to Diagnostic Aids for DTC P0300).
keep questions out of tech tips
During a learn procedure the PCM/ ECM learns the amount of crankshaft position (CKP) system variation. If a crankshaft variance relearn is not performed, then there is a chance of setting codes.
NOTE: If the Crankshaft Variation Relearn is not accessible through your scan tool (some truck applications 1998 & later), perform the relearn in the following manner:
1. Turn off all of the accessories. With the Air temperature sensor and Coolant temperature within 5 degrees (Centigrade) of each other, start the engine and let it idle in Park or Neutral for two minutes.
2. Accelerate the vehicle to 55 mph at part throttle. Cruise at 55 mph for 8- 10 minutes until the engine reaches operating temperature.
3. Cruise at 55 mph for another 5-6 minutes.
4. Decelerate to 45 mph without using the brakes, and maintain 45 mph for 1 minute.
5. Perform 4 deceleration cycles, without using the brakes, of 25 seconds each where no specific speed is necessary. Returning to 45 mph for 15 seconds in between deceleration cycles.
6. 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.