Crankshaft Position Sensor Replacement

Crankshaft Position Sensor Replacement

CRANKSHAFT POSITION SENSOR REPLACEMENT (ENGINE CONTROLS - 3.5L) / Document ID# 654053

Crankshaft Position Sensor Replacement

Removal Procedure

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Caution:Refer to

Caution:Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

For Vehicles equipped with OnStar® (UE1) with Back Up Battery:

The Back Up Battery is a redundant power supply to allow limited OnStar® functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar®module). Do not disconnect the main vehicle battery or remove the OnStar® fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar® module in any way while the ignition is On or with RAP activated may cause activation of the OnStar® Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.

in Cautions and Notices.

  1. Disconnect the negative battery cable.

Caution:Refer to

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.

in Cautions and Notices.

  1. Raise the vehicle.
  2. Loosen or remove the starter motor (1) as necessary. Refer to Starter Replacement (LX5)Starter Replacement (L47)in Engine Electrical.
  3. Disconnect the electrical connector from the crankshaft position (CKP) sensor (2).

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  1. Remove the CKP sensor mounting bolt (1).
  2. Remove the CKP sensor (2) from the engine block:
  3. Remove the sensor by pulling on the sensor connector. Do not pry on the bracket.
  4. Do not rotate or twist the sensor or damage the mounting bracket if the sensor is being reused.

Installation Procedure

Important: When replacing the CKP sensor with a new sensor or reinstalling the original sensor, use the following recommended procedures:

  • Make sure that the CKP sensor bore is completely free of any foreign material, such as old O-ring, dirt, burrs, etc.
  • Make sure that the flange on the CKP sensor bore is not damaged.
  • Clean all the mounting surfaces before re-installing any components.
  • Inspect the CKP sensor and replace the sensor if any of the following conditions are present:
  • The bracket is damaged.
  • The bottom of the brass housing exhibits any damage.
  • Never install a sensor that has been dropped.
  • Lubricate the O-ring on the sensor with Amojell or clean engine oil prior to installing the sensor .
  • Check all the connectors for any damaged terminals.


  1. Lubricate the CKP sensor O-rings.
  2. Install and fully seat the CKP sensor (2) into the engine block.

Notice:Refer to Fastener Noticein Cautions and Notices.

  1. Install the CKP sensor mounting bolt (1).

Tighten:

Tighten the mounting bolt to 9 [n-m] (80 lb in).

  1. Ensure that the CKP sensor mounting flange is contacting the engine block.


  1. Connect the electrical connector to the CKP sensor (2).
  2. Re-install or tighten the starter motor (1) as necessary. Refer to Starter Replacement (LX5)Starter Replacement (L47)in Engine Electrical.
  3. Reconnect the negative battery cable.
  4. Lower the vehicle.
  5. The Crankshaft Position System Variation Learnmust be performed after replacing the CKP sensor. Even if the original sensor is reinstalled, the Learn Procedure must be performed.

"Portions of materials contained herein have been reprinted with permission of General Motors Corporation, Service and Parts Operations" License Agreement #0410810.

Copyright 2007 - 2012 Service Repair Solutions, Inc.

CAMSHAFT POSITION SENSOR REPLACEMENT (ENGINE CONTROLS - 3.5L) / Document ID# 654056

Camshaft Position Sensor Replacement

Removal Procedure

  1. Remove the mounting nuts retaining the coolant recovery tank .
  2. Lift the coolant recovery tank to gain access to the camshaft position (CMP) sensor.

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  1. Disconnect the electrical connector from the CMP sensor.
  2. Remove the CMP sensor mounting bolt (2).
  3. Remove the CMP sensor (1) from the cylinder head.
  4. Remove the sensor by pulling on the sensor connector. Do not pry on the bracket.
  5. Do not rotate or twist the sensor or damage the mounting bracket if the sensor is being reused.

Installation Procedure

Important: When replacing the CMP sensor with a new sensor or reinstalling the original sensor, use the following recommended procedures:

  • Ensure that the CMP sensor bore is completely free of any foreign material, such as old O-ring, dirt, burrs, etc.
  • Ensure that the flange on the CMP sensor bore is not damaged.
  • Clean all of the mounting surfaces before re-installing any components.
  • Inspect the CMP sensor and replace the sensor if any of the following conditions are present:
  • The bracket is damaged.
  • The bottom of brass housing exhibits any damage.
  • Never install a sensor that has been dropped.
  • Lubricate the O-ring on the sensor with Amojell or clean engine oil prior to installing the sensor.
  • Check all of the connectors for any damaged terminals.


  1. Install and fully seat the CMP sensor (1) into the cylinder head.

Notice:Refer to Fastener Noticein Cautions and Notices.

  1. Install the CMP sensor mounting bolt (2).

Tighten:

Tighten the bolt to 9 [n-m] (80 lb in).

  1. Connect the electrical connector to the CMP sensor.
  2. Lower the coolant recovery tank onto the mounting studs.
  3. Install the 2 mounting nuts to retain the coolant recovery tank .

Tighten:

Tighten the nuts to 1 [n-m] (9 lb in).

"Portions of materials contained herein have been reprinted with permission of General Motors Corporation, Service and Parts Operations" License Agreement #0410810.

Copyright 2007 - 2012 Service Repair Solutions, Inc.

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