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.
1997 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Speed Sensor Signal Check
NOTE:
When using LEXUS Hand-Held Tester, follow scan tool instructions and start at step 2).
- Turn ignition off. Using jumper wire, connect DLC1 connector terminals Ts and E1. See Figure.
- Start engine. ABS light should blink once every .13 second. If ABS light does not blink, check ABS light circuit. See ABS WARNING LIGHT CIRCUIT under CIRCUIT TESTS . Check Ts circuit. See Ts TERMINAL CIRCUIT under CIRCUIT TESTS.
- Keep vehicle stationary on level ground with brake pedal released for one second or more. Press brake pedal with 33 lbs. (15 Kg) force for one second or more. Release brake pedal, then press brake pedal with 22 lbs. (10 Kg) force and release. ABS light should come on for 3 seconds.
- Drive vehicle straight ahead at 28 MPH or greater for several seconds, until ABS light goes out. Stop vehicle. Using another jumper wire, connect DLC1 connector terminals Tc and E1. There should now be 2 jumper wires. See Figure.
- Observe ABS light. If system is normal, ABS light will blink every .25 second. If system is malfunctioning, ABS light will flash codes. See SPEED SENSOR DIAGNOSTIC CODE IDENTIFICATION . Repair as needed. Turn ignition off. Remove jumper wires from DLC1 connector.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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