QSB 6.7 Phase III Sensor Introduction

2. Camshaft Position Sensor

• Mainly used to determine the engine's position in fuel timing control.

• Hall effect sensor.

• Faces a machined groove in a signal ring mounted with a bolt on the camshaft end.

• Serves as a backup signal for the crankshaft speed sensor.

3. Crankshaft Speed Sensor

• Primarily used to determine the engine speed

• Hall effect type sensor

• Faces a machined groove on a signal ring mounted to the end surface of the crankshaft with bolts

• Serves as a backup signal for the camshaft position sensor

4. Coolant Temperature Sensor

• Two-wire Sensor

• Located on the cylinder head between the engine coolant outlet pipe and the rocker cover

5. Atmospheric Pressure Sensor

• Used for high-altitude power reduction protection for the engine (turbocharger)

• Installed on the main engine wiring harness on the fuel pump side of the engine, near the ECM

6. Fuel Rail Pressure Sensor

• The ECM is used to determine the pressure of the fuel stored in the high-pressure common rail.

7. Intake Manifold Temperature and Pressure Sensor

• Combined Sensor

• Used by ECM for air-fuel ratio control

• Four-wire Sensor

• Installed on the intake manifold cover

         (Temperature & Pressure)

8. Water-in-Fuel Sensor

• Located on the OEM-installed 25-micron suction side fuel filter

• Senses the accumulation of water in the fuel water separator

• The ECM activates an orange warning light or a water-in-fuel indicator to notify the operator