I have no power to relay fuel pump

Asked by Aug 11, 2014 at 10:45 PM about the 1995 Isuzu Rodeo 4 Dr S 4WD SUV

Question type: Maintenance & Repair

No power to pump relay

5 Answers

118,615

If you have no power on both sides then you either have a blown circuit or an open one in the main power supply. one side should be hot all the time and the other hot only when the engine is cranking or running, grounds are ECM controlled on this vehicle.

2 people found this helpful.
40

How can I detect the ecm and correct the problem

4 people found this helpful.
118,615

Use a digital volt meter, hook up the positive wire to the battery and the ground wire to the fuel pump relay ground wire, turn on key you should get a voltage for a few seconds then it will go away, if you don' t get a voltage reading then there is either a broken wire from the ECM to the relay or the ECM has lost the fuel pump relay driver inside the ECM.

3 people found this helpful.

What is the ECM

118,615

Engine control module.

1 people found this helpful.

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