Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN1999GTI (1J1) L4-2.0L (AEG)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCAMSHAFT POSITION SENSORSERVICE AND REPAIR
1999 Volkswagen GTI (1J1) L4-2.0L (AEG)
Camshaft Position Sensor: Service and Repair
1999 Volkswagen GTI (1J1) L4-2.0L (AEG)SECTION Service and Repair
Removing and Installing Camshaft Position Sensor
The intermediate shaft and the distributer have both been eliminated on the AEG engine. This required the CMP Sensor to be moved to a new position. It is now mounted behind the camshaft drive belt sprocket, with the trigger wheel attached to the back of the sprocket.
The four trigger wheel windows (two wide and two narrow windows) pass the sensor in a distinctive sequence that in turn produces a distinctive pulse width pattern for each 90 degrees of camshaft rotation.
The ECM identifies camshaft position and determines the fuel injection and ignition sequence before the engine has completed a half revolution. This results in improved engine starting and reduced cold-start emissions.
7 Camshaft Position Sensor G40
8 Black, 3-pin, harness connector
G40:
Mounted on cylinder head behind camshaft sprocket
Trigger Wheel (Hall Effect Trigger) mounted on the camshaft sprocket
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.