GM 10456161
Crankshaft Position Sensor

The crankshaft position (CKP) sensor replacement process begins by disconnecting the negative Battery Cable then hoisting the vehicle. Access both the right inner fender cover and crankshaft Harmonic Balancer before moving forward. Begin sensor shield removal while avoiding pry bars to detach the electrical connector and remove two attaching bolts securing the Crankshaft Position Sensor. Next step involves removing the Crankshaft Position Sensor directly from the block face. Position the ckp sensor on the block prior to bolt installation which requires a torque setting between 20 - 40 n.m (14-28 lb ft). Reinstall the Crankshaft Position Sensor shield but reconnect the ckp sensor electrical connector afterward. After setting the crankshaft Harmonic Balancer correctly on the crankshaft install the right inner fender access cover then drop the vehicle to ground while reattaching the negative Battery Cable. Don't forget to execute the crankshaft variation learn procedure. To execute this process professionals need three essential tools: torque/angle meter (J 36660-A), flywheel holding tool (J 37096), and crankshaft balancer pulley (J 38197-A).

In order to replace crankshaft position (CKP) sensor, one should ensure that the ignition switch is off. Use j 36660 torque/angle meter, j 37096 flywheel holding tool, and j 38197 balancer remover for the procedure. This will be achieved by taking off the serpentine belt from the Crankshaft Pulley (CM1904) after which the vehicle should be hoisted and the right front tire and wheel assembly is removed, followed by the right inner fender splash shield, flywheel inspection cover (CM1907). The next step is to pull off the crankshaft Harmonic Balancer and undo the sensor electrical connector. Do not use a pry bar and in turn remove the ckp sensor shield and the two attaching bolts to remove the ckp from the block face. For installation, place the ckp sensor to the block, install and tighten the bolts up to 30 nm (22 lb ft). Replace the Crankshaft Position Sensor shield, hook up the ckp sensor electrical connector, and reinstall the crankshaft harmonics balancer, right inner fender splash shield, and right front wheel and tire assembly. Lower the vehicle, install the serpentine belt to the Crankshaft Pulley, then reconnecting the negative Battery Cable, and carry out the crankshaft position system variation learn procedure.

The crankshaft position (CKP) sensor replacement process starts with turning off the ignition then removing the serpentine belts from the Crankshaft Pulley. Start by raising the vehicle until it becomes accessible to remove wheel and tire assemblies and the right inner fender access panel. Attach the Flywheel holding tool (J 37096) to stabilize the Flywheel afterward remove the crankshaft Harmonic Balancer retaining bolt using a 28 mm socket. The balancer remover (J 38197) will remove the crankshaft Harmonic Balancer and the technician should install the Crankshaft Position Sensor shield without using any pry bar. Remove the Crankshaft Position Sensor from the block face by first disconnection of the sensor electrical connector and then unscrewing the sensor's attaching bolts. Place the ckp sensor onto its proper block position before installing the bolts and setting their tightness between 20-40 n.m (14-28 lb ft). Attach the Crankshaft Position Sensor shield before you reconnect the electrical connector to the sensor. Position the crankshaft Harmonic Balancer on the crankshaft then clamp the Flywheel with a Flywheel holding tool (J 37096) before torquing the Harmonic Balancer bolt to 150 n.m +76 degrees (110 lb ft +76 degrees) using torque/angle meter (J 36660-A). Secure the right front wheel and tire assembly to the hub before torquing the wheel nuts to 140 n.m (104 lb ft). Finally, attach the right inner fender access cover. After vehicle lowering install both serpentine belts while finishing the crankshaft variation learn procedure.

The Crankshaft position (CKP) system variation compensating values reside in pcm non-volatile memory following a learn procedure which must run after setting dtc p1336 or when the pcm or Crankshaft position sensor and engine and Crankshaft and Crankshaft Harmonic Balancer are replaced. A safety precaution requires blocking drive wheels while applying the parking brake before beginning the procedure. Relax throttle pressure when the engine hits its 5,150 rpm second fuel cut-off point while the motor uses natural idle descending. Following a completed learn procedure the pcm will hand control of the engine back to the operator. The engine coolant temperature must exceed 70°c (158°F) before starting the learn procedure because the scan tool function becomes disabled for lower temperatures. During the learn function pcm disables operation when powertrain dtcs besides p1336 appear or detects problems with the camshaft position signal circuit, 3x reference circuit, or 18x reference circuit. Apply the parking brake and disable the driver wheels along with checking that the hood is secure before starting the learn procedure. After starting the engine let the coolant temperature rise to at least 70°c (158°F) before shutting down the ignition. Begin the Crankshaft position system variation learn procedure with your scanner test tool enabled while starting the vehicle using normal braking routines that maintain pressure on the Brake Pedal and keeping the transaxle in the park position. Push the accelerator pedal to achieve the first ckp system variation learn fuel cut-off point then let go of the pedal when the second fuel cut-off happens. The learning of compensating values occurs when rpm reaches its initial idle position. Check for dtc p1336 after finishing the scan. Toward completion of this task inspect dtc p1336 for a result of 'passed.' the learn process should be repeated because other dtcs cleared out during diagnosis and p1336 remained the only dtc.

Service procedures for Crankshaft Position Sensor repair should begin with using a scan tool to monitor the powertrain control module (PCM) for dtcs except p1336; refer to the diagnostic trouble code list when other dtcs exist. Start the learn procedure for crankshaft position (CKP) variation through a scan tool to monitor engine fuel cut-off situations. Follow the scan tool's instructions: first secure the drive wheels then engage the parking brake and cycle ignition from off to on before holding down the Brake Pedal to start the engine while idling it in park (A/T) or neutral (M/T) mode with a/c off. During the procedure the scan tool monitors three functions: ckp sensor activity alongside cmp sensor activity while tracking engine coolant temperature (ECT) values. You should let the engine idle until the engine coolant temperature sensor shows it has reached its target range. Follow the scan tool instructions to enable ckp system variation learning during which time unlock the throttle pedal instantly when engine deceleration occurs to let engine control return to the driver. Advance engine speed while monitoring rpm until fuel cut-off occurs then release the throttle. The scan tool indicates "learn status: learned this ignition" in its display. Learned this ignition." no additional dtcs exist when the initialization message fails to display so check to determine if there are any engine-related symptoms. A dtc present indicates to check the dtc list for relevant information. Complete the learn procedure by shutting off the ignition after a period of 30 seconds for successful completion.

Start your crankshaft position (CKP) sensor replacement by verifying the vehicle's ignition is off. Gather the necessary tools: the tool set required for this work consists of the torque/angle meter (J 36660-A), flywheel holding tool (J 37096), and balancer remover (J 38197). Start by removing serpentine belt(s) from the Crankshaft Pulley before raising the vehicle and removing right front wheel with attached tire as well as the right inner fender access cover. Remove the crankshaft Harmonic Balancer and Crankshaft Position Sensor shield by hand without applying a pry bar. Begin by disconnecting the ckp sensor electric connector. Then detach its bolts before extracting the sensor from the engine block's surface. You need to install the ckp sensor on the block while adding the bolts which should get tightened to 20-40 n.m (14-28 lb ft). Reposition the crankshaft Harmonic Balancer while reinstalling the Crankshaft Position Sensor shield followed by wiring the electrical connector to the shield. Replace the right front wheel and tire assembly along with the right inner fender access cover by securing wheel nuts at 140 n.m (104 lb ft). After platform-lowering complete the serpentine belt replacement and execute the ckp system variation learn procedure.

Reinstall the CKP sensor shield.

Tighten the studs to 20 N.m (15 lb ft) plus an additional 40 degrees using the Angle Meter (J 45059).

Reinstall the CKP sensor shield.

Take off the crankshaft position sensor (CKP) shield without using a pry bar.

Position the crankshaft position (CKP) sensor to the block and install the bolts to secure it, tightening them to 30 N.m (22 lb ft).

Tighten the bolts to 30 N.m (22 lb ft).

Reposition the wiring harness heat shield.

Perform the Crankshaft Variation Learn Procedure.

Reposition the wiring harness heat shield.

Consult the DTC List for applicable information.

Position the crankshaft harmonic balancer on the crankshaft, reinstall the right splash shield cover, lower the vehicle, reconnect the negative battery cable, and perform the crankshaft position (CKP) system variation learn procedure.

Disconnect the CKP sensor electrical connector.

Take the sensor out from the block face.

Disconnect the negative battery cable and raise the vehicle on a hoist.

Perform the crankshaft position (CKP) system variation learn procedure.

Lower the vehicle, install the serpentine belts, reconnect the negative battery cable, and perform the Crankshaft Variation Learn Procedure.

First, disconnect the negative battery cable, ensuring safety precautions are followed.

Set the parking brake, block the driver wheels, and ensure the hood is closed.

Install the serpentine accessory drive belt and reconnect the negative battery cable.

Remove the two attaching bolts from the CKP sensor, then take the CKP sensor off the block face.

Remove the crankshaft sensor bolt and take out the crankshaft sensor.

Connect the CKP sensor electrical connector, reinstall the right front wheel, and lower the vehicle.

Install the CKP sensor to the block, ensuring to follow the Fastener Notice in Service Precautions.

Position the 24X crankshaft position sensor with bolts and route the harness as noted during removal.

Disconnect the CKP sensor electrical connector.

Gradually increase the engine speed to the observed RPM and release the throttle when fuel cut-off is reached.

Tighten this bolt to 10 N.m (89 lb in).

Turn the steering wheel fully to the left and then raise and support the vehicle.

Remove the sensor bolts and take out the CKP sensor.

Disconnect the CKP sensor electrical connector.

Remove the right front wheel.

Reconnect the CKP sensor electrical connector, reinstall the right front wheel, lower the vehicle, and perform the CKP system variation learn procedure.