aaaa logo

Member of Australian Automotive Aftermarket Association

PRTC Council Member

4WD Council Member

Latest News

CAM Angle Sensors (CAM)

What Technicians need to know about function, types, location, diagnosing and testing camshaft position sensors on single and multi-camshaft engines.

All sequential EFI fuel injection systems plus all Variable Valve Timing (VVT) mechanisms and including direct fuel injection systems require the PCM to monitor single or multiple camshaft position data to ensure all the systems function correctly.

This may range for the purpose of sequential fuel injection timing only or may include the requirements for ECU triggered ignition coils and if applicable monitoring VVT control.

A technician requires to identify which system is utilised on the vehicle for diagnostic purposes as phasing of CAM and CRANK sensor signals should alter on VVT systems only during operation.

Note: Image shows both Camshaft sensors are correctly aligned (within tolerance) with the Crankshaft position sensor.

Location points on the engine for CAM angle position sensors.

The location points for CAM position sensor/s will generally vary depending on the valve train configuration and the engine system requirements.

  • A vehicle with sequential injection system and single camshaft would require only one CAM position sensor.

As an example, this sensor may be located on the front timing cover area – VS-VY Commodore 3.8Ltr.

Other locations for these single camshaft systems may be the front or rear area of the Camshaft “or” an assembly driven by the Camshaft, typically AU Falcon V8.

Typical location at front of camshaft.

  • A vehicle with sequential injection and VVT may have two or four CAM position sensors depending on the number of camshafts and /or engine management system requirements.

These sensors may be generally located at the front or rear areas of the related camshaft.
The BF/FG 6 cyl utilises 2 units at the rear of the cylinder head area.

    • One for the inlet camshaft.
    • One for the exhaust camshaft.

The VZ/VE Commodore 3.6 Alloytech utilises 2 units at the front of the engine, one for each inlet camshaft.
The VZ/VE Commodore 3.6 Alloytech 190 utilises 4 units at the front of the engine, one for each camshaft.

Types of expected CAM position sensor signals.

Depending on the vehicle being worked on, the CAM sensor may create a Digital Hall signal or an Analogue sign wave signal.

Typical examples are:

Testing CAM position sensor signals when a fault code has been logged.

Whether a vehicle can start or not, there are many causes of a logged CAM sensor code that may or may not be caused by a CAM sensor malfunction. It is advantageous for a technician to understand the function of the CAM sensor for that specific vehicle system and the effect on vehicle operation.

The technician needs to determine:

  • If there is a signal created by the CAM sensor.
  • If the signal is correct.
  • If the signal is in phase with the other CAM sensors if applicable and the CAS. (If out of phase, what is the cause)

Typical test equipment required for CAM signal.

  • Suitable scanner.
  • Suitable oscilloscope
  • Current clamp for specific crank testing if required.
  • Note: Out of phase conditions may be caused by worn timing chains (known as stretched chain in the industry) or worn timing chain guides / gears or malfunction in the VVT system or incorrectly aligned camshafts when new chains fitted. (This also includes similar timing belt malfunction conditions).

Visual inspections for valve timing may be very time consuming on some engines and Current clamps may assist during cranking to determine individual cylinder compression effects on the starter motor.

Typical “vehicle out of phase performance” may result in engine misfiring or a no start condition with fault light and codes activated.

Renewing a CAM sensor will not rectify this condition. Determining the cause of incorrect phasing and its correction is required to satisfactorily repair the vehicle.

The Premier Auto Trade Sensor range includes more than 200 Cam Angle Sensors (CAM) from the world’s leading manufacturers, covering over 12 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.

Latest News

Tech Tips - Wheel Speed Sensors (WSS)

Positive Crankcase Ventilation (PCV) and Oil Separators

Common Rail Diesel Pumps (HDP)

Exhaust Gas Temperature Sensor (EGT)

Hose Clamps

MAP Sensors (Manifold Absolute Pressure)

Electric Water Pumps

Pulse Width Modulation (PWM)

Mass Air Flow Sensors (Hot Wire/Film)

Petrol Fuel Injector Replacement

Electronic Throttle Bodies (TBO)

Dual Petrol Injection Systems – Technical Tip

Wheel Speed Sensors – More than just ABS

PAT Expands Emission Sensor Range

PAT Racing & Performance Injector Range Upgrade

Coils ain’t Coils!


Oil Level and Oil Temperature Sensors Operation

Failed Air Temperature Sensors Symptoms

MAP Sensors Testing

TI Automotive Mustang Performance Pump

New ICON SERIES Hose Clamp Range

New Premium Sensors Ranges

Relay problems on vehicle

Test Equipment and Tools

Fuel Rail Sensors (FRS)

Failing Secondary Ignition

Testing Electric Fuel Pumps

Performance Fuel Rails and Filters

Testing CAM Angle Sensors (CAM)

Testing Electric Valve Solenoids (EVS)

Electronic Throttle Bodies

Performance Fuel Cells & Surge Tanks

Fault Finding Fuel Pressure Regulators (FPR)

Testing Variable Camshaft Actuators (VCA)

Testing Accelerator Pedal Position Sensors (APS)

Diagnosing Crank Angle Sensors (CAS)

Performance Regulators and Gauges

Differentiating Wheel Speed Sensors (WSS)

Mass Air Flow Sensors - Hot Film

Mechanical Fuel Pumps (MFP)

ICON Series Hoses

Particulate Matter Sensors (PMS)

Performance Fuel Injectors

Fuel Injectors (GDI)

DENSO Spark Plugs

Performance Fuel Pumps

Cooling Fan Switches (CFS)

Water Temperature Sensors (WTS)

Reverse Light Switches

Oil Temperature Sensors (OTS)

BMC Air Filters

Flasher Cans

Exhaust Pressure Sensors (EPS)

Power Steering Switches

Coolant Temperature Sensors (CTS)

Variable Intake Manifolds (VIM) and Intake Control Valves (ICV)

Oil Level Sensors (OLS)

Throttle Position Sensors (TPS)

Air Temperature Sensors (ATS)

Ignition – Condensers, Contact Sets, Distributor Caps and Rotors

Fuel System Accessories (FSA)

MAP Sensors (MAP)

Relays (REL)

HALL Sensors and Pickups (HAL)

Fuel Rail Sensors (FRS)

Speed Sensors (SPS)

New ICON Series Fuel Pump Range

New ICON Series Hose Range

Performance Range Increase Continues

PAT Oxygen Sensor Range Expands

PAT Expands Automotive Aftermarket Presence

Equipment and Tools

Electric Fuel Pumps (EFP)

Electric Valve Solenoids (EVS)

CAM Angle Sensors (CAM)

Ignition Modules (MOD)

Injector Service Components

Exhaust Gas Temperature Sensors (EGT)

Throttle Bodies

Knock Sensors

Ignition Coils

Fuel Injectors (Petrol)

Variable Camshaft Actuators (VCA) Oil control Valves

Accelerator Pedal Position Sensors (APPS)

Exhaust Gas Recirculation Valves (EGR)

Relocation of Sydney Distribution Centre

Wheel Speed Sensors (WSS)

High Tension - Ignition Lead Sets (ILS)

Suction Control Valves (SCV)

Mass Air Flow (MAF) Sensors

Crank Angle Sensors (CAS)

Fuel Pressure Regulators (FPR)

Oil Pressure Sensors

Exhaust Gas Oxygen Sensors

Shedding Light on Stop Light Switches

Ignition Distributors

Common Rail Diesel (CRD) Fuel Injectors

Idle Speed Control

New Distribution Centre Opening in ADELAIDE

New Distribution Centres Opening in PERTH and DARWIN

New Fuel Catalogue from Premier Auto Trade

BMC 4WD Air Filters Range Expands

New MVP Fuel Injector Range

PAT Developing Programs on Demand

New Premium Packaging for PAT

New Product Ranges Released By PAT

PlusQuip Test Equipment Range Expands

New Raceworks Catalogue

New Exhaust Gas Temperature Sensors

New Trade Catalogues from Premier Auto Trade

New Distribution Centre Opening in Adelaide

More European Parts from Premier Auto Trade

New PlusQuip Fuse Current Tester

PAT Pumped up!

Coils ain't Coils!

New PlusQuip Electronic EGR, Throttle Body, and Actuator Tester

New breed of High Performance products!

New Ignition Coil and Lead Set Kits

Wheel Speed Sensor Program Launched

Premier Ignition Lead Program Launch

Ignition Coils - Coils ain't Coils!

PlusQuip Battery Testers Launch

Premier Auto Trade Supporting Local Racing

Oval Trumpet Airbox (OTA) for 4WD applications from BMC Air Filters

BMC Air Filters NOW AVAILABLE from Premier Auto Trade

Premier Ignition Coils

MAP-013 and KNS-021 Now Back in Stock

BMC Air Filter partners with Premier Auto Trade

Premier Auto Trade opens South Australian Distribution Centre

Direct Fit Oxygen Sensor Range Hits 700

Automotive Electro-Mechanical Relays Types / Faults / Diagnosis

PlusQuip Tools and Equipment Launch

PlusQuip Fuel Line Repair Kit

PlusQuip Fuel Injector Service Kit

E85 High Performance with Premier Auto Trade

Testing EGR Systems (Pt 2)

New Delphi Fuel Module and Ignition Coil Range

Fuel Injector Service Components from Premier Auto Trade

Older News...

   privacy statement   terms of use   terms and conditions   sitemap   news  

© PremierAutoTrade