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.
1990 Toyota CressidaFACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests - EFI
- Introduction
- Sensors & Switches
- Airflow Meter & Sensor Test
- Coolant Temperature Sensor Test
- EGR Gas Temperature Sensor Test
- Knock Sensor Test
- Neutral/Start Switch Test
- Oxygen Sensor Feedback Voltage Test
- Sub-Oxygen Sensor Test
- Oxygen Sensor Heater Test
- Throttle Position Sensor (TPS) Test
- Vehicle Speed Sensor (Analog Type) Test
- Vehicle Speed Sensor (Digital Type) Test
- Circuit Opening Relay Test
- EFI Main Relay Test
- Fuel Delivery Test
- Fuel Pump Relay & Resistor Test
- Fuel Injectors Test
- Deceleration Fuel-Cut System Test
- Cold Start Injector Test
- Cold Start Injector Time Switch Test
- Idle Speed Control (ISC) System Test
- Ignition System Diagnostic Code Tests
- Spark Test
- Primary Coil Resistance Test
- Secondary Coil Resistance Test
- Pick-Up Coil Resistance Test
- Pick-Up Coil Air Gap Check
- Emissions & Sub-Systems Checks
- EGR System Test
- EGR Vacuum Modulator Test
- Vacuum Switching Valve (VSV) Test
- Fuel Evaporation Checks
- Maintenance
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.