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 MANUALSMERCEDES BENZ1989420SELREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMTESTINGTEST 5TESTING INTERNAL RESISTANCE OF SPEED SENSOR
1989 Mercedes Benz 420SEL
Testing Internal Resistance Of Speed Sensor
1989 Mercedes Benz 420SELSECTION Testing Internal Resistance Of Speed Sensor
- Multimeter set to "OHMS" position. Ignition on. Rotary switch moved successively to positions 4 (left front wheel), 5 (right front wheel) and 6 (rear differential).
- Internal resistance:
- Front Wheel 1100-2300 ohms.
- Rear Differential 600-1600 ohms.
- If resistance is less than or more than step 2), check coaxial plug or cable connector and connecting lines. Replace speed sensor or adjust wheel bearing play.
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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.