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 MANUALSPLYMOUTH1994LASER FWD L4-1997CC 2.0L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)TESTING AND INSPECTIONRELAY INSPECTION
1994 Plymouth Laser FWD L4-1997cc 2.0L DOHC
Relay Inspection
1994 Plymouth Laser FWD L4-1997cc 2.0L DOHCSECTION Relay Inspection
1. Remove the multiport fuel injection relay.
2. Use jumper wires and connect multiport fuel injection relay terminal (10) to the battery (+) terminal and terminal (8) to the battery (-) terminal.
Caution: Be very careful when connecting the jumper wires because the relay will be damaged if a mistake is made with the contact terminals.
3. With battery (-) terminal jumper wire connected and disconnected, measure the voltage at multiport fuel injection relay terminals (4) and (5).
4. Use jumper wires to connect multiport fuel injection relay terminal (9) to the battery (+) terminal and terminal (6) to the battery (-) terminal.
5. Disconnecting the jumper wire on the terminal (-) side of the battery, check whether or not continuity exists across terminals (2) and (3) of the multiport fuel injection relay.
6. Use jumper wires and connect multi port fuel injection relay terminal (3) to the battery (+) terminal and terminal (7) to the battery (-) terminal.
7. With the battery (-) terminal jumper wire connected and disconnected, measure the voltage at multiport fuel injection relay terminal (2).
8. Replace the multiport fuel injection relay if faulty.
2. Use jumper wires and connect multiport fuel injection relay terminal (10) to the battery (+) terminal and terminal (8) to the battery (-) terminal.
Caution: Be very careful when connecting the jumper wires because the relay will be damaged if a mistake is made with the contact terminals.
3. With battery (-) terminal jumper wire connected and disconnected, measure the voltage at multiport fuel injection relay terminals (4) and (5).
4. Use jumper wires to connect multiport fuel injection relay terminal (9) to the battery (+) terminal and terminal (6) to the battery (-) terminal.
5. Disconnecting the jumper wire on the terminal (-) side of the battery, check whether or not continuity exists across terminals (2) and (3) of the multiport fuel injection relay.
6. Use jumper wires and connect multi port fuel injection relay terminal (3) to the battery (+) terminal and terminal (7) to the battery (-) terminal.
7. With the battery (-) terminal jumper wire connected and disconnected, measure the voltage at multiport fuel injection relay terminal (2).
8. Replace the multiport fuel injection relay if faulty.
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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.