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Home >> Lexus >> 1991 >> LS 400 V8-4.0L (1UZ-FE) >> Repair and Diagnosis >> Steering and Suspension >> Steering >> Power Steering >> Steering Control Module >> Testing and Inspection
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Steering Control Module: Testing and Inspection

Power Steering ECU
1. JACK UP VEHICLE AND SUPPORT IT ON STANDS

2. REMOVE INSTRUMENT PANEL NO.1 UNDER COVER

HINT: Do not disconnect the ECU connector.





3. START ENGINE

4. MEASURE VOLTAGE OF ECU

(a) Using a voltmeter, measure the voltage between ECU terminals SOL (-) and GND while the engine is idling.

Standard voltage: 0.32-0.44 V





(b) Place the transmission in gear and while running at about 60 km/h (37 mph), measure the voltage between ECU terminals SOL (-) and GND.

Standard voltage:
Voltage measured in (a) above, minus 0.04-0.18 V

If no voltage, try another ECU.

5. INSTALL INSTRUMENT PANEL NO.1 UNDER COVER

6. LOWER VEHICLE
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