11.13 Camshaft position sensor (CMP) (Hall Sensor)
Camshaft Position Sensor Voltage Values (SMR)
Terminal numbers
See illustration 11.10, 11.11
Checking the camshaft position sensor (SMR) (general check)
1. Inspect the camshaft position sensor multi-pin connector for signs of corrosion and damage.
2. Make sure the connector pins are properly installed and making good contact with the camshaft position sensor multi-pin connector.
Checking the performance of the camshaft position sensor (SMR)
1. Checking is quite simple. The sensor has three wires: a power wire, a ground wire and a signal wire.
2. Connect the positive voltmeter lead to the camshaft position sensor multi-pin connector (see note 2) or connect output unit (WWII) between the multi-pin connector of the electronic control unit and the electronic control unit.
3. Connect the negative lead of an oscilloscope, breaker closed time meter, or voltmeter to ground on the motor.
4. Connect the positive probe of an oscilloscope, breaker closed duration meter, or voltmeter to the signal wire terminal of the camshaft position sensor.
Camshaft position sensor output test (SMR)
- Start the engine and let it idle and check the output (see illustration 11.14)
11.14 Typical camshaft position sensor output waveform (SMR)
No signal or signal intermittent, duty cycle or voltage
1. The camshaft position sensor multi-pin connector is disconnected and the ignition is on.
2. Check the voltage supply to the camshaft position sensor power wire terminal (SMR).
3. Check the camshaft position sensor ground wire terminal for grounding.
4. Connect the positive voltmeter lead to the signal wire terminal.
5. The meter should show a voltage of approximately 5.0 volts.
No voltage
1. Check for voltage at the terminal of the multi-pin connector of the electronic control unit.
2. If there is voltage in the electronic control unit, check the conductivity of the signal wire.
3. If there is no voltage in the electronic control unit, check the voltage supply to the electronic control unit and its grounding. If the voltage supply and grounding are in order, then the electronic control unit may be faulty.