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Circuit Description

Fuel pump is powered by fuel pump relay. PCM energizes fuel pump relay at ignition on for 2-3 seconds. Fuel pump will remain on for as long as PCM receives reference pulse from electronic ignition system. Conditions for setting DTC:

Ignition is on.
System voltage 9-18 volts.
PCM detects an electrical malfunction on fuel pump relay control circuit.
Conditions met for 0.5 second.