Bench Testing: Rotor

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2000 Lexus SC 400, 2000 Lexus SC 300, 2000 Lexus RX 300, 2000 Lexus LS 400, and 2000 Lexus GS 400. However, it is still accessible from the selected car via links, so may be relevant.

Check rotor for open field windings by measuring resistance across slip rings. Resistance should be within specifications. See ROTOR RESISTANCE SPECIFICATIONS table. Check rotor for short circuit to ground by connecting ohmmeter between one slip ring and rotor. Continuity should not exist. If resistance and continuity are not as specified, replace rotor.
Check slip rings for wear or damage. Turn rotor/slip rings on lathe if necessary. Ensure slip ring diameter is not less than .504" (12.8 mm). Check bearing and replace if necessary.

ROTOR RESISTANCE SPECIFICATIONS

Application

⁽¹⁾ Ohms

ES300, LS400, RX300 & SC300

2.1-2.5

GS300 & GS400

2.2-2.4

SC400

2.7-3.1

⁽¹⁾	Measured at 68°F (20°C).