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 MANUALSISUZU1996TROOPER S, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSENGINE SENSORS & SWITCHESVEHICLE SPEED SENSOR (VSS)
1996 Isuzu Trooper S, Automatic
Vehicle Speed Sensor (VSS)
1996 Isuzu Trooper S, AutomaticSECTION Vehicle Speed Sensor (VSS)
- Vehicles have one VSS located in vehicle speedometer and one mounted on left rear of transmission. Transmission mounted VSS sends signal to speedometer VSS, which controls needle movement and sends signal to ECM and cruise control.
- For testing speedometer VSS, remove speedometer from meter assembly. Using DVOM, measure resistance value between terminals 4P and GND. See Fig 1 . Resistance should be 13,500-16,000 ohms. If resistance is not as specified, replace speedometer assembly.
- For testing transmission mounted VSS, remove VSS from transmission by rotating sensor body. Connect jumper wire between VSS connector terminal No. 1 and positive battery terminal. See Fig 1
.WARNING: DO NOT connect battery voltage to VSS connector terminal No. 3; VSS damage will result.
- Connect jumper wire between VSS connector terminal No. 2 and negative battery terminal. Connect 1.3k-5k ohm resistor (1/4 watt or more) between VSS connector terminals No. 1 and 3.
- Using a DVOM, measure voltage across resistor while rotating sensor shaft slowly. With one rotation of sensor shaft, voltage should fluctuate 4 times. Ensure voltage fluctuates between 10-14 volts and 2 volts or less. If sensor voltage is outside specification, replace VSS.
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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.