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Latest News Testing CAM Angle Sensors (CAM) What Technicians need to know about on car testing of CAM angle position sensors and related circuitry. Faulty CAM position sensors may affect various engine operating systems in many ways. In many cases, a no start condition may result from a faulty CAM sensor or related wiring as the ignition system is affected. Other systems utilise the cam sensor signal for sequential injector timing and will allow the engine to run with the CAM sensor disconnected without sequential programming. Typically: VS-VY 3.8ltr Commodore systems will allow engine to run with single CAM sensor disconnected.
As mentioned in the previous CAM article, there may be singular or multiple CAM sensors utilised by the PCM to monitor the position of the camshaft/s (therefore engine valves). These may be inductive or digital signal type units. Fault codes assisting in specific diagnosis: (all types of CAM sensors) In many cases a specific fault code may assist the technician in determining if a CAM sensor signal area of fault is generally created by a mechanical or electrical condition. Typically: Logged fault code P0342 (camshaft position circuit high) is usually caused by faulty CAM electrical circuit conditions. Note: Ford specific fault code P1000 (OBD11 monitor testing not complete) may be logged when fault codes have recently been cleared and the PCM has not completed a self-diagnostic cycle of all readiness monitors. This code will give no assistance to the technician until the cycles have completed allowing for a suitable fault code to be logged if conditions demand. Typical vehicle symptoms with faults in CAM sensor system may be:
When a cam sensor signal or related fault code is logged, the technician must determine the cause of fault. This may be one of the following system areas:
Determine if “Inductive type CAM sensor” is functioning. Connecting a suitable oscilloscope to the Cam sensor terminals will quickly allow the technician to monitor any CAM sensor signal. Typical Toyota type CAM sensor and simplified circuit.
A “no signal” condition requires a few simple tests to determine area of fault.
Note: This type of sensor does not require a power supply to create an AC wave signal.
Functionality test:
Testing Hall sensor type CAM sensor for functionality. As mentioned in the previous article, unlike the inductive cam sensors, the HALL type sensors require a power supply to function and create a square wave signal.
Testing for a suitable power supply and ground is required prior to condemning a cam sensor for an incorrect HALL signal. Like the inductive type CAM sensor, the wiring harness must be tested for open and short circuits If a no signal is evident prior to renewing the sensor. The Premier Auto Trade Sensor range includes more than 200 Cam Angle Sensors (CAM) from the world’s leading manufacturers, covering almost 13 million vehicle applications in Australia and NZ. When you supply and fit products from Premier Auto Trade you can expect a product designed and tested to the vehicle manufacturer’s specifications offering OE form, fit and function. Premier Auto Trade distributes products throughout Australia via a network of specialised resellers and leading automotive groups. |
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