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.
1988 Toyota CressidaFACTORY OEM SERVICE PROCEDURE
Computer Control System
- Description
- Operation
- Characteristics
- Electronic Fuel Injection (EFI)
- Data Sensors
- Notes
- A/C Switch
- Airflow Sensor
- Air Temperature Sensor
- Cold Start Injector Time Switch
- Coolant Temperature Sensor
- Coolant Temperature Switch
- EGR Gas Temperature Sensor
- Engine Speed
- Knock Sensor
- Neutral/Start Switch
- Oxygen (O2) Sensor
- Sub-Oxygen Sensor (Calif. Only)
- Throttle Position Sensor (TPS)
- Turbo Pressure Sensor
- Vehicle Speed Sensor (VSS)
- 4WD Switch
- Electronic Control Unit (Ecu)
- Diagnostic System
- Component Locations
- Diagnosis & Testing
- Ecu Connector I.D.
- Diagnostic Charts
- Diagnostic Circuit Check
- Ecu Wiring Connector Resistances
- Ecu Pin Voltage Test
- No. 1 Test, Code 11 Ecu (+B) Circuit
- No. 2 Test, Code 12, 13, 14, Ignition & Rpm Signal
- No. 3 Test, Code 23, TPS Signal
- No. 4 Test, Code 43, Starter Signal
- No. 5 Test, Airflow Meter Signal
- No. 6 Test, Coolant Temp. Sensor Signal
- No. 7 Test, ISC Valve Signal
- No. 8 Test, Injector Circuit Test
- Component Testing
- Airflow Meter
- Idle Speed Control (ISC) Valve
- Throttle Position Sensor (TPS)
- Cold Start Injector Time Switch
- Coolant Temperature Sensor
- EGR Temperature Sensor
- Oxygen (O2) Sensor Heater
- Knock Sensor
- Oxygen Sensor
- Turbocharging Pressure Sensor
- Turbocharging Pressure Vacuum Switching Valve (VSV)
- Vehicle Speed Sensor
- Injector Solenoid Resistor
- Fuel-Cut Rpm
- Neutral/Start Switch
- Wiring Diagrams
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.