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 MANUALSVOLKSWAGEN1991JETTA L4-1984CC 2.0L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCYLINDER IDENTIFICATION SENSORTESTING AND INSPECTION
1991 Volkswagen Jetta L4-1984cc 2.0L DOHC
Cylinder Identification Sensor: Testing and Inspection
1991 Volkswagen Jetta L4-1984cc 2.0L DOHCSECTION Testing and Inspection
Ignition Reference Sensor:
1. With the ignition "OFF", disconnect the ignition reference sensor harness connector.
2. Connect a suitable volt/ohm meter between terminals 1 and 2 of the ignition reference sensor.
Measure the resistance between terminal 1 and 2.
^ The correct measurement should be less than 2 ohms.
3. Measure the resistance between terminal 1 and ground.
4. Measure the resistance between terminal 2 and ground.
^ The correct measurement should be infinite ohms.
5. If the correct measurements are not obtained the sensor is defective. Replace the reference sensor
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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.