CM850 Electronic Control System – 019-390   Turbocharger Speed Sensor

The turbocharger speed sensor is located on the bottom of the turbocharger between the compressor and the turbine housings toward the rear (flywheel) side of the turbocharger. INSITE™ electronic service tool can be used to monitor the sensor for proper operation.

CAUTION  When removing the turbocharger speed sensor, use a twisting motion while pulling upward. Prying on the sensor body with a screwdriver can lead to broken sensors and could result in unwarranted turbocharger replacement.

Disconnect the Cannon™ connector from the turbocharger speed sensor.

Unscrew the speed sensor from the turbocharger housing and remove.

Inspect the turbocharger speed sensor body for signs of melting or damage. If signs of melting or damage are found on the sensor, inspect the turbocharger coolant supply for restriction.

If the turbocharger speed sensor is being removed due to an oil leak, inspect the turbocharger speed sensor o-ring for signs of damage.  If the o-ring is cut or damaged, the o-ring must be replaced.

If there are no cuts or damage evident to the o-ring, it is possible to reseal and prevent oil leaks.  To do this, apply Loctite™ 5699, or equivalent, to the o-ring and the area where the o-ring sits on the speed sensor, prior to assembly.

CAUTION  The turbocharger speed sensor harness must be tied up and away from any heat sources and hard or sharp surfaces. Failure to do so will cause damage to the harness.

Make sure the new turbocharger speed sensor has a new o-ring installed.

If the turbocharger speed sensor was removed due to an oil leak, it is possible to reuse the turbocharger speed sensor and either replace or inspect the o-ring for reuse (as described in the Inspection section above).

Apply Loctite™ 5699, or equivalent, to the o-ring.  This helps seal and prevent oil leaks.

Install the turbocharger speed sensor into the engine.

Push the Cannon™ connector together and twist until it locks in place.

The connector must be fully mated.

Use cable ties to attach the harness to the turbocharger coolant feed line.

Start the engine and verify with INSITE™ electronic service tool that the turbocharger speed sensor is working properly.