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 TESTING
1994 Plymouth Laser FWD L4-1997cc 2.0L DOHC
Relay Testing
1994 Plymouth Laser FWD L4-1997cc 2.0L DOHCSECTION Relay Testing
Caution:
a. When applying battery voltage to the Control Relay, verify power source connections are to the correct terminals. Otherwise, the Control Relay will be damaged.
b. The following test procedures should be performed in the order instructed. If not, inaccurate results and damage to the relay may occur.
1. Disconnect the Control Relay electrical connector, and remove the relay.
2. Connect a lead wire with alligator clips from the positive terminal of the battery to terminal # 10 of the relay.
3. Check for voltage from terminals # 4 and # 5 to ground, when the lead wire from the negative terminal of the battery is connected to terminal # 8 of the relay.
Battery voltage should exist during connection.
4. Connect the lead wire from the negative terminal of the battery to terminal # 6 of the Control Relay.
5. Check for continuity between terminals # 3 and # 2, while the lead wire from the positive terminal of the battery is connected to terminal # 9 of the relay.
Continuity should exist during connection.
6. Connect the lead wire from the positive terminal of the battery to terminal # 3 of the Control Relay.
7. Check for voltage at terminal # 2, when the lead wire from the negative terminal of the battery is connected to terminal # 7 of the relay.
Battery voltage should exist during connection.
a. When applying battery voltage to the Control Relay, verify power source connections are to the correct terminals. Otherwise, the Control Relay will be damaged.
b. The following test procedures should be performed in the order instructed. If not, inaccurate results and damage to the relay may occur.
Control Relay And Connector:
1. Disconnect the Control Relay electrical connector, and remove the relay.
MPI Control Relay Circuitry:
2. Connect a lead wire with alligator clips from the positive terminal of the battery to terminal # 10 of the relay.
Checking The Control Relay:
3. Check for voltage from terminals # 4 and # 5 to ground, when the lead wire from the negative terminal of the battery is connected to terminal # 8 of the relay.
Battery voltage should exist during connection.
4. Connect the lead wire from the negative terminal of the battery to terminal # 6 of the Control Relay.
Checking The Control Relay:
5. Check for continuity between terminals # 3 and # 2, while the lead wire from the positive terminal of the battery is connected to terminal # 9 of the relay.
Continuity should exist during connection.
6. Connect the lead wire from the positive terminal of the battery to terminal # 3 of the Control Relay.
Checking The Control Relay:
7. Check for voltage at terminal # 2, when the lead wire from the negative terminal of the battery is connected to terminal # 7 of the relay.
Battery voltage should exist during connection.
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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.