How test the camshaft position sensor ?
Before testing any electrical component, inspect the wiring and connectors for damage. Also wiggle the connectors to ensure that they are firmly engaged. For this procedure a dwell meter, or the equivalent, will be needed.
1. Unplug the Camshaft Position Sensor (CPS) connector
2. Turn the ignition ON .
3. Using a voltmeter, measure the voltage
from the wiring harness connector 8-volt supply circuit (orange wire) to ground :
- If the voltage is 8-9.5 volts, skip to the next step.
- If the voltage measured is lower than 8 volts, or greater than 9.5 volts, the CPS is not receiving the correct current to function properly. There is a problem in the wiring or related components.
4. Turn the ignition OFF
5. Attach the CPS wiring
and engine wiring harness connectors back together.
6. Attach a dwell meter to the battery. Attach the lead probe of the dwell meter
to the sensor signal wire (light blue wire with dark blue tracer) by back probing the connector or by using jumper cables between the terminals. Refer to the accompanying wiring illustration.
7. Place the dwell meter out of the way of any moving component
s of the engine, and in a position in which it can be seen once the engine is started.
8. Turn the engine ON
9. Watch the dwell meter for one or two minutes while the engine is idling.
The dwell time shown should be a steady 49-51%. If there is any fluctuation, or the dwell time is not 49-51% the CPS is defective and must be replaced with a new one.