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 SYSTEMSVEHICLE SPEED SENSORTESTING AND INSPECTION
1991 Volkswagen Jetta L4-1984cc 2.0L DOHC
Vehicle Speed Sensor: Testing and Inspection
1991 Volkswagen Jetta L4-1984cc 2.0L DOHCSECTION Testing and Inspection
1. With the ignition "OFF", disconnect the Motronic control unit harness connector. The Motronic control unit is located beneath the drip tray, at the left rear (drivers side) of the engine compartment.
2. Connect a suitable volt/ohm meter between terminal 2 and 35 of the Motronic control unit harness connector. Set the voltmeter to DC volts.
Special Tools:
CAUTION: Avoid damaging the delicate connectors within the control unit harness connector. A simple set of test leads can be fabricated using flat connectors (part # VW N 17 457 2) or equivalent, and a pair of alligator clips.
3. Raise the vehicle.
4. Rotate one front wheel in a forward direction. The opposite wheel must be prevented from rotating.
^ Reading should alternate between 0 and 4 volts DC.
If the correct reading is not obtained:
a. Check for good ground at terminal 35 of the harness connector.
b. Check the vehicle speed input circuit between the instrument cluster and terminal 2 of Motronic control unit. Refer to CHASSIS ELECTRICAL DIAGRAMS for instrument cluster information.
Vehicle Speed Sensor:
5. If all circuits are OK, repair or replace the vehicle speed sensor or instrument cluster as necessary.
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.