Engine Speed Sensor: Service and Repair

The engine speed (rpm) sensor is located on the front of engine. Spacers located behind the sensor are used to position sensor over the vibration damper.

Before removing sensor and its pigtail wiring harness, note position and routing of harness. This routing must be maintained to prevent wiring from contacting belt or pulleys.

REMOVAL
1. Disconnect speed sensor pigtail harness from main engine wiring harness near front/top of engine.
2. Remove clip bolts from sensor pigtail wiring harness.
3. Remove two speed sensor mounting nuts.
4. Remove speed sensor and its mounting spacers from engine.






NOTES:
- The engine speed sensor has 2 slotted holes to adjust its depth. A brass (non-magnetic) feeler gauge must be used to adjust sensor.
- Sensor-to-vibration damper air gap: 1.25 MM (0.049 in.) minimum to 1.30 MM (0.051 in.) maximum.

INSTALLATION/ADJUSTMENT
1. Position speed sensor, its mounting spacers and two mounting nuts to engine. Install mounting nuts finger tight.
2. Route sensor wiring harness behind engine pulleys. Install and tighten wiring harness clip bolts.
3. Place feeler gauge between bottom of sensor and top of vibration dampener.
4. Gently seat (push down) sensor until it contacts feeler gauge. Sensor should be flat to feeler gauge. Slide sensor through slotted holes until flat to feeler gauge. Be sure sensor is not near either of notches on vibration damper. If sensor is adjusted at or near these notches, it will be damaged when engine is started.
5. Tighten sensor mounting nuts to 24 N.m (18 ft. lbs.) torque.
6. Remove feeler gauge.
7. Connect sensor electrical pigtail connector to main engine wiring harness.