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.
1996 Mercedes Benz E320FACTORY OEM SERVICE PROCEDURE
Test 7: Vehicle Speed Signal
- Using Harness Adapter (210 589 01 63 00), connect Breakout Box (129 589 00 21 00) to combination control module. Measure voltage between ground and terminals No. 74 at breakout box. Rotate left front wheel approximately one turn per second. If approximately 5 volts AC exists, vehicle speed signal is okay at this time. If approximately 5 volts AC does not exist, check the following and repair as necessary:
- Check wiring.
- If vehicle is equipped with Acceleration Slip Regulation ASR) and Speed-Sensitive Power Steering (SPS), check ASR/SPS control module.
- On vehicle is equipped with Electronic Traction System (ETS) and Speed-Sensitive Power Steering (SPS), check ETS/SPS control module.
Factory Service Tools
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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.