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 Plymouth Colt BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests - PFI
- Introduction
- Air Induction Systems
- Computerized Engine Controls
- Engine Sensors & Switches
- Barometric Pressure Sensor
- Coolant Temperature Sensor
- Crank Angle Sensor
- EGR Temperature Sensor (CALIFORNIA)
- Idle Position Switch (Colt & Colt Wagon 1.5L)
- Idle Position Switch (Colt Vista 2.0L)
- Idle Position Switch (Colt 1.6L)
- Inhibitor Switch (Automatic Transmission)
- Intake Air Temperature Sensor
- Motor Position Sensor
- Oxygen Sensor (1-Wire Or 2-Wire)
- Oxygen Sensor (4-Wire Heated)
- Power Steering Oil Pressure Switch
- Throttle Position Sensor
- Vehicle Speed Sensor
- Relays, Solenoids & Motors
- Fuel System
- Idle Control System
- Ignition System
- Crank Angle Sensor (DOHC Engines)
- Crank Angle Sensor (SOHC Engines)
- TDC Sensor (DOHC Engines)
- TDC Sensor (SOHC Engines)
- Emission Systems & Sub-Systems
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.
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