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.
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1999 Lexus SC 400
Diagnosis - A-650E
1999 Lexus SC 400SECTION Diagnosis - A-650E
- Application
- Description
- Operation
- ECT Ecu
- ECT Ecu Input Devices
- Pattern Select Switch Signal
- Park/Neutral Position (PNP) Switch Signal
- Throttle Position (TP) Sensor Signal
- Vehicle Speed Sensor (VSS) Signal
- OD Direct Clutch Speed Sensor Signal
- Brakelight Switch Signal
- OD Switch Signal
- Engine Coolant Temperature (ECT) Sensor Signal
- ATF Temperature Sensor
- Cruise Control Electronic Control Unit (ECU)
- ECT Ecu Output Devices
- Manual Shift Test
- Self-Diagnostic System
- Scan Tool Problems
- Diagnostic Tests
- Notes
- DTC P0500: Vehicle Speed Sensor (VSS) Fault
- DTC P0710: ATF Temperature Sensor
- DTC P0715: Od Direct Clutch Speed Sensor
- DTC P0750, P0755 & P0760: No. 1, No. 2 & No. 3 Solenoid Fault
- DTC P0753, P0758 & P0763: No. 1, No. 2 & No. 3 Solenoid Circuit
- DTC P0768: No. 4 Solenoid Circuit
- DTC P0770: Lock-Up (SL/SLU) Solenoid
- DTC P1520: Stoplight Switch Signal Malfunction
- DTC P1755: Lock-Up/SLU Solenoid Circuit
- DTC P1760: SLT Solenoid Circuit (Line Pressure Control)
- DTC P1765: SLN Solenoid Circuit Malfunction
- DTC P1780: Park/Neutral Position (PNP) Switch
- Component Tests
- Removal & Installation
- Torque Specifications
- Wiring Diagrams
RENDER: 1.0x
NO RELATED
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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.