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:

• Engine speed greater than 400 RPM.
• System voltage is 6-18 volts.
• PCM determines that fuel pump driver commanded state and actual state do not match.
• Conditions met for at least 10 seconds.