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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HOMESERVICE MANUALSPLYMOUTH1984COLT E, 4D HATCHBACK, 1.4 AREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMECI SYSTEMTESTING & DIAGNOSISPRETESTING INSPECTION
1984 Plymouth Colt E, 4D Hatchback, 1.4 A
Pretesting Inspection
1984 Plymouth Colt E, 4D Hatchback, 1.4 ASECTION Pretesting Inspection
If ECI system components fail, interruption of fuel supply or failure to supply proper amount of fuel for engine operation will result. The following conditions will result: engine is hard to start or does not start at all, unstable idle and/or poor driveability. Before testing ECI system, perform basic engine checks first (ignition system, incorrect engine adjustments, etc.).
ECI SYSTEM CHECK PROCEDURE CHART
| Application | Condition | Normal Voltage | Computer Terminal | ||||
|---|---|---|---|---|---|---|---|
| Power Supply | Ignition switch OFF - ON | 11 - 13V | B-1 | ||||
| Secondary Air Control SolenoidValve | Ignition switch OFF - ST | 30 seconds | A-10 | ||||
| " | After warming up the engine | 0.2 - 1V To 13 - 15V | A-10 | ||||
| Throttle Position Switch | Ignition Switch OFF - ON, Accelerator closed | 0.4 - 1.5V | A-1 | ||||
| " | Ignition Switch OFF - ON, Accelerator wide opened | 4.5 - 5.0V | A-1 | ||||
| Coolant Temperature Sensor | Ignition switch OFF - ON 0°C (32°F) | 3.5V | A-3 | ||||
| " | Ignition switch OFF - ON 20°C (68°F) | 2.6V | A-3 | ||||
| " | Ignition switch OFF - ON 40°C (104°F) | 1.8V | A-3 | ||||
| " | Ignition switch OFF - ON 80°C (176°F) | 0.5V | A-3 | ||||
| Intake Air Temperature Sensor | Ignition switch OFF - ON 0°C (32°F) | 3.5V | A-4 | ||||
| " | Ignition switch OFF - ON 20°C (68°F) | 2.6V | A-4 | ||||
| " | Ignition switch OFF - ON 40°C (104°F) | 1.8V | A-4 | ||||
| " | Ignition switch OFF - ON 80°C (176°F) | 0.5V | A-4 | ||||
| Idle Position Switch | Ignition switch OFF - ON Accelerator closed | 0 - 0.4V | A-5 | ||||
| " | Ignition switch OFF - ON Accelerator wide opened | 11 - 13V | A-5 | ||||
| ISC motor position switch | Ignition switch OFF - ON | 11 - 13V (1) | A-14 | ||||
| EGR Control Solenoid Valve | Ignition switch OFF - ON | Return to 0V after 1 seconds. 0 - 0.5V after 1 seconds | B-4 | ||||
| ISC Motor for Extension | Ignition switch OFF - ON | Pointer C swings amoment after 15 seconds | B-6 | ||||
| A/C Relay | Ignition Switch OFF - ON, A/C switch OFF - ON | 11 - 13V | B-12 | ||||
| Reed Switch for Vehicle Speed | Start engine, transmission in first | 0.2 - 1V | A-15 | ||||
| " | Operate vehicle slowly | 4 - 5V | A-15 | ||||
| Ignition Pulse | Idling | 12 - 15V | A-8 | ||||
| " | 3,000 RPM, When engine speed is increased, voltage drops slightly. | 11 - 13 V | A-8 | ||||
| Air Flow Sensor | Idling | 2.7 - 3.2V | A-7 | ||||
| " | 3,000 RPM | 2.7 - 3.2V | A-7 | ||||
| ISC Motor for Retraction | Ignition switch OFF - ON | Pointer swings a moment after 15 seconds | B-11 | ||||
| Cranking signal | Ignition switch OFF - ST | Over 8V | A-13 | ||||
| Control Relay | Idling | 0 - 1V | B-5 | ||||
| ISC Motor Position Switch | Idling | 11 - 13V | A-14 | ||||
| Injector No. 1 | Idling | 13 -15V | B-9 | ||||
| " | 3,000 RPM, When engine speed is increased, voltage drops slightly. | 12 -13V | B-9 | ||||
| Injector No. 2 | Idling | 13 - 15V | B-10 | ||||
| " | 3,000 RPM, When engine speed is increased, voltage drops slightly. | 12 - 13V | B-10 | ||||
| Oxygen Sensor | Keep 1,300 RPM after warming up the engine | Flashing 0 - 1V - 2.7V | A-6 | ||||
| EGR Control Solenoid Valve | Idling after warming up the engine. Over 3,000 RPM, drops to 0V. | 13 - 15V | B-4 | ||||
| Pressure Sensor | Ignition switch OFF - ON | 1.5 - 2.6V | A-17 | ||||
| " | Idling | 0.2 - 1.2V Switches back to 2.0V every 2 min. | A-17 | ||||
| ISC Motor for Extension | Idling, A/C switch OFF - ON | Over 5V (2) | B-6 | ||||
| ISC Motor for Retraction | Idling, A/C switch ON - OFF | Over 6V (2) | B-11 | ||||
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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.