Premier L4-150 2.5L (1988)
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If battery voltage is present during cranking, the fuel pump relay is functioning normally. Test fuel pump circuit for voltage and ground at
fuel pump.
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If no voltage is present at terminal 87 proceed to step 3.
3.
Move the voltmeter positive lead to the terminal 86 wire of the fuel pump relay connector. Turn the ignition key to the RUN position. Battery
voltage from the ignition relay (terminal 30) should be present.
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If voltage is present proceed to step 4.
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If no voltage is present there is either a bad connection or an open wire between terminal 30 of the ignition relay and terminal 86 of the fuel
pump relay. Locate and repair bad connector or open in wire, and test operation.
4.
Move voltmeter positive lead to terminal 85 of the fuel pump relay connector. Turn ignition key to START position, and crank engine, while
observing voltage. Voltage should be present and drop to less than 1 volt within 2 seconds during cranking.
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If voltage drops, and there is voltage at terminal 30 and no voltage at terminal 87 the relay is bad. Replace the fuel pump relay and check
operation.
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If voltage does not drop, proceed to step 5.
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If no voltage is present, disconnect the fuel pump relay, and connect an ohmmeter between terminal 86 and terminal 85 of the fuel pump relay
and check for continuity. If no continuity exists replace the fuel pump relay and test operation.
5.
Disconnect the 35 way ECU, and 6 way diagnostic connectors and fuel pump relay. Connect an ohmmeter between terminal 85 of the fuel pump
relay connector and the yellow wire at pin connector no. 3 of the ECU. Check for continuity.
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If no continuity exists repair open in wire, reconnect ECU and fuel pump relay, and test operation.
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If continuity exists, the problem is computer related.
