1990-1993 Lexus LS400, ES250/300, SC300/400 Service Manual
Comprehensive repair and technical service information covering the 1990-1993 Lexus LS400, ES250/300, and SC300/400 models. Ref: AC001-98
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Lexus Models Covered & Key Technical Specifications
Models: Lexus LS 400, Lexus ES 250, Lexus ES 300, Lexus SC 300, Lexus SC 400
Sub-models / Variants: 1990–1992 LS 400, 1990–1991 ES 250, 1992–1993 ES 300, 1992–1993 SC 300, 1992–1993 SC 400
Build Years: 1990–1993
Serial Numbers: AC001-98
Technical Data:
- Idle speed: Approx. 700 rpm
- Magnetic clutch clearance: 0.5 ± 0.15 mm (0.020 ± 0.006 in.)
- Standard refrigerant charge: 650 g to 1000 g depending on model
- Ambient temperature limit: 25°C (77°F) for optimal operation
- Compressor oil type: ND Oil 8 (PAG) for retrofit systems
- Continuity check resistance: 1 Ω or less
- Short circuit resistance: 1 MΩ or higher
- ECU circuit voltage range: 10–14 V
- Standard compressor bolt torque: 49 N⋅m (500 kgf⋅cm, 36 ft⋅lbf)
Lexus Manual Features & Content Preview
1990–1993 Lexus LS400, ES250/300, SC300/400 Air Conditioning Service Data
- Built for owners and workshops servicing the 1990–1993 Lexus LS 400, ES 250, ES 300, SC 300, and SC 400 cooling systems
- Official Lexus Technical Service Information Bulletin AC001–98, dated April 3, 1998
- Contains 4087 pages of technical data including torque tables, wiring diagrams, and component location maps
- Delivered as a direct download the moment payment clears
- Full-text search finds any part number in seconds
- This specific edition provides the necessary conversion specifications and oil/refrigerant charge volumes for R–12 to R134a system retrofitting
Technical Scope and Air Conditioning Data
This publication documents the full service procedures for the air conditioning systems installed in the 1990–1993 Lexus LS 400 and related models. Coverage includes detailed diagnostic logic for the climate control ECU, including a full table of diagnostic codes and symptom-based matrix charts. Chapters delineate testing parameters for sensors including room temperature, ambient temperature, evaporator temperature, water temperature, solar intensity, and compressor lock mechanisms. Wiring diagrams for the A/C control assembly and associated blower fan speed control systems are provided, along with terminal pinout tables for the ECU.
Specifications and Diagnostic Values
Technical specifications are organized by circuit for rapid review. The manual lists torque settings for refrigerant lines, such as the 25 N⋅m (18 ft-lbf) spec for suction and discharge hoses. Cooling system capacity for the 2006 GL 1800 is documented at 2.73 liters. The Suzuki QuadRunner LT300E magneto pick-up coil resistance is specified at 450–650 ohms. Valve clearance for the intake is listed at 0.11–0.20 mm in the cylinder head specification table. Detailed inspection procedures are provided for testing manifold gauge pressures and vacuum evacuation. The manual also outlines requirements for retrofitting R–12 systems to R134a, specifying the exact oil and refrigerant volumes required for different compressor models. A comprehensive 4087-page Lexus factory manual covering the 1990–1993 Lexus LS 400, ES 250/300, and SC 300/400 platforms, documenting engine-integrated A/C control, chassis sensors, electrical diagnostics, and climate retrofit procedures.
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