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 Plymouth Colt BaseFACTORY OEM SERVICE PROCEDURE
ECI System
- Description & Operation
- ECI System
- Air/Fuel Ratio Control System
- Ignition Timing Control System
- Idle Speed Control (ISC) System
- Fuel Control
- Airflow Sensor
- Barometric Pressure Sensor
- Intake Air Temperature Sensor
- Coolant Temperature Sensor
- Throttle Position Sensor (TPS)
- Engine Speed Signal
- Idle Switch
- Motor Position Sensor (MPS)
- Oxygen Sensor
- Vehicle Speed Sensor
- Air Conditioner Switch
- Air Conditioner Relay
- Detonation Sensor
- Inhibitor Switch
- Cold Mixture Heater
- Testing & Diagnosis
- Self-Diagnostic Codes
- Notes
- Self-Diagnostic Test
- Diagnostic Code 1 (Oxygen Sensor)
- Diagnostic Code 2 (Engine Speed Sensor)
- Diagnostic Code 3 (Airflow Sensor)
- Diagnostic Code 4 (Pressure Sensor)
- Diagnostic Code 5 (Throttle Position Sensor)
- Diagnostic Code 6 (ISC Motor Position Sensor)
- Diagnostic Code 7 (Coolant Temperature Sensor)
- ECI Inspection Test
- Ignition Timing Control System Test
- Component Testing & Inspection
- Adjustments
- 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.
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