RL V6-3474cc 3.5L (1998)
Main Relay (Computer/Fuel System): Testing and Inspection
PGM-FI Main Relay
Description
This PGM-FI main relay is located behind the dashboard lower cover. The PGM-FI main relay actually contains two individual relays. One relay is
energized whenever the ignition is on. It supplies battery voltage to the PCM, power to the fuel injectors, and power for the second relay. The second
relay is energized for 2 seconds when the ignition is switched on, and when the engine is running. It supplies power to the fuel pump.
Relay Testing
NOTE: If the engine starts and continues to run, the PGM-FI main relay is OK.
1. Remove the PGM-FI main relay.
2. Attach the battery positive terminal to the No.3* terminal and the battery negative terminal to the No.2* terminal of the PGM-FI main relay. Then
check for continuity between the No.5* terminal and No.2 terminal of the PGM-FI main relay.
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If there is continuity, go on to step 3.
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If there is no continuity, replace the relay and retest.
3. Attach the battery positive terminal to the No.4 terminal and the battery negative terminal to the No.7* terminal of the PGM-FI main relay. Then
check that there is continuity between the No.3 terminal and No.1 terminal of the PGM-FI main relay.
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If there is continuity, go on to step 4.
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If there is no continuity, replace the relay and retest.
4. Attach the battery positive terminal to the No.1 terminal and battery negative terminal to the No.2* terminal of the PGM-FI main relay. Then
check that there is continuity between the No.5* terminal and No.2 terminal of the PGM-FI main relay.
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If there is continuity, the relay is OK; If the fuel pump still does not work, go to Harness Testing.
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If there is no continuity, replace the relay and retest.
