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.
Vehicle Speed Sensor
2004 Acura 3.5RLSECTION Vehicle Speed Sensor
- VSS is located on top of differential assembly. See Figure . Ensure fuse No. 13 (7.5-amp) in passenger compartment fuse/relay box (located behind left kick panel) is okay. If fuse is okay, go to next step.
- Disconnect 3-pin harness connector at VSS. Turn ignition on. Measure voltage between Yellow wire of 3-pin harness connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Yellow wire.
- Measure voltage on Blue/White wire between 3-pin harness connector and ground. If voltage is 5 volts or greater, go to next step. If voltage is not 5 volts or greater, repair open or short to ground in Blue/White wire between VSS and PCM.
- Turn ignition off. Disconnect PCM harness connector "D". Check for continuity in Green/Blue wire between VSS 3-pin harness connector and PCM harness connector "D" terminal No. 22 (Green/Black wire). If continuity exists, go to next step. If continuity does not exist, repair open Green/Blue wire between VSS and PCM.
- Raise and support vehicle. Place transaxle in Neutral. Turn ignition on. Rotate one front wheel while holding other front wheel stationary. If voltage pulses from zero volts to about 5 volts or greater, go to next step. If voltage does not pulse as specified, replace vehicle speed sensor.
- Disconnect instrument panel gauge assembly 22-pin connector "A". See Figure . Measure voltage on Blue/White wire between ground and instrument panel gauge assembly connector "A" terminal No. 18 while rotating one front wheel and holding other front wheel stationary. If voltage pulses from zero volts to about 5 volts, replace speedometer. If voltage does not pulse as specified, repair open Blue/White wire between VSS connector and speedometer.
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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.