Camshaft Sensor Testing

Video tutorial on how to test the camshaft sensor of a Volvo 850 equipped with a 5 cylinder. This tutorial was done on a 1996 model. If your vehicle has no spark, hard starts, or is running rough, this could possible be the culprit of the problem.

Procedure:
-the plug for the camshaft sensor is located directly under the distributor held in my a metal bracket
-unplug the harness by depressing the metal retaining clip on the plug and pull straight back
-once the plug is disconnected, using a multimeter you're able to test the pins for continuity and voltage readings
-the number of the pin is printed on the rubber portion of the plug in very small lettering
-determine what your vehicles battery voltage is by testing the vehicle's battery
-test Pin 1 (ground) for continuity to the ground on the battery
-test Pin 2, with the key in position 2, should read approximately 5V
-test Pin 3, with the key in position 2, should read approximately battery voltage
-turning the key off now, using sewing needles, insert the needles in the backside of the connector on the ecu end to Pin 1 and Pin 2
-ensure they are connected by testing the continuity
-connect the plug back to the camshaft position sensor
-an analog multimeter is required for this job because the voltage pulse will not read accurately on a digital meter
-touching the test probes on the exposed needle ends, have someone turn the engine over and watch for a pulsating voltage
-the voltage should read approximately 5V, similar to what Pin 2 reading was earlier on in the tests
-if there is no faults with the previous voltage tests, but there is a weak or no signal voltage, the camshaft sensor is faulty
-having the probes touching each of the exposed needle ends




Camshaft Sensor Replacement

Video tutorial on how to replace the camshaft sensor of a Volvo 850 equipped with a 5 cylinder. This tutorial was done on a 1996 model. If your vehicle has no spark, hard starts, or is running rough, this could possible be the culprit of the problem.

Testing for a faulty camshaft sensor:
Procedure:
-unclip harness with is located directly under the distributor caps, depress steel clip and pull plug straight out
-camshaft sensor is located on the distributor side of the motor, to the rear of the valve cover under the top motor mount
-remove the vacuum lines in the bracket which comes off when the lower bolt is removed for the camshaft position sensor
-remove the 2 torque bolts which are T-40
-the sensor should pull straight out
-reinstall new sensor in reverse

 

Dear All,

I need a 2nd opinion on my S90 1997 which has indicator on dashbox and garage mechanic diagnostic message on screen shows "CPM 314 Permanent/ Faulty Signal Faulty; Camshaft position senser signal absent or EVAP system faulty."

Other than replacing a new sensor as immediately mentioned without further check by mechanic, wonder if there is any other alternative before paying for the new Sensor??
Thanks
Stewart

 

Try a used sensor...