The crankshaft position sensor is mounted in the engine block, below the intake manifold. It is a simple pulse generator that signals the DIS module when specific crankshaft position markers move past it. The crankshaft position sensor defines the engine position. A crank pulse occurs at each occurrence of Top Dead Center (TDC), at 60 degrees After Top Dead Center (ATDC), and at 120 degrees ATDC. A seventh pulse, referred to as the sync pulse, occurs at 70 degrees ATDC at the No. 1 cylinder.
If there is no rpm signal or no ignition output, unplug the sensor and connect an ohmmeter across the terminals. Resistance should be 700-900 ohms. The sensor and its circuit have a polarity, meaning if the sensor wiring is reversed, the PCM sees an open circuit. Reversing the CPS wires will result in a no-start condition.
For more information regarding the crankshaft position sensor and the ignition system, refer to Engine Electrical of this guide.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Raise and support the vehicle safely.
- Detach the electrical connector from the sensor, located at the lower rear of the engine block.
- Unfasten the sensor retaining bolt, then remove the sensor from the engine.
- Lubricate the sensor O-ring with clean engine oil and install the sensor into the engine block.
- Install the sensor retaining bolt and tighten to 80 inch lbs. (9 Nm).
- Attach the CPS electrical connection.
- Lower the vehicle and connect the negative battery cable.