The multimeter should have an infinite, or "OL," reading. The purpose of testing a relay is to find, whether it is good or bad . Consult your owner's manual or a service manual to find the location of your fuel pump relay.

7 terminal of the main relay. In most cases, once it fails your vehicle will no longer run, leaving you stranded. Once you know how to test a fuel pump relay, you can test other automotive relays without much trouble. These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. A failure of this part can cripple your car’s functioning. You'll find relays with three, five or even six terminals, though.
In about 20% of the cases, this lack of fuel could be caused by a blown fuse, a bad fuel pump relay, a triggered fuel pump interrupt switch etc. A relay is switch that utilizes an electrical trigger signal to activate. If the fuel pump still does not work, keep testing down the wiring harness toward the fuel pump. Testing the Ford fuel pump relay on the car is not that hard to do. With the relay in the configuration that has the 2 load pins connected, place the test voltage on 1 of the load pins of the relay and an automotive test light on the other load pin of the relay. A fuel pump failure never seems to come at a good time. In case of fuel injection systems, one of the most important parts is a fuel pump relay. You'll be able to find out if the fuel pump relay, or the fuel pump Inertia Switch, or the fuel pump is the cause … These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. Then check that there is continuity between the No. I found how to test the relay with a multimeter, so that's all set. I need to test my fuel pump and relay. Knowing these signs and how to test your fuel pump can help you avoid a costly breakdown or a dangerous situation. With the help of this ‘How To’ tutorial, I'll show you how to do it using only a multimeter. If there is continuity, the relay is just fine. The terminals are usually labeled on the case of the relay. Our patent pending TIPM Plug-In Fuel Pump Power Bypass/Test System is the best long-term solution for vehicles that are experiencing fuel pump relay problems on applicable 2007-2016 Chrysler/Jeep/Dodge/VW vehicles.

I also found how to test the fuel pump with a multimeter by measuring the resistance across two terminals to see if there is a voltage (finite resistance) or a lack thereof (infinite resistance). By activating I specifically mean allowing voltage to pass thru' the relay (internally) and on its way to the component that needs to activate (fuel pump, cooling fan relay, A/C compressor, etc.). If there is continuity, replace the relay. In case of any fuel injection problems, it is customary to run a test on the relay, to determine if the source of the problem is that component. On three terminal relays, the case itself may serve as the ground connection. The automotive test light should light. How To Test A Relay With A Multimeter. When a relay is defective, it is usually because of a bad coil or bad connection. And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. Set the multimeter to the "Ohms" setting and test the continuity of the relay's power terminals. A car's fuel pump relay turns on the fuel pump when the motor runs. A relay is switch that utilizes an electrical trigger signal to activate. In some cases, your fuel pump will begin showing some subtle signs of failure before it completely fails. To check both operations, remove the relay by pulling it out of its socket. 5 terminal and No. This test result usually confirms that the fuel pump is bad (in about 80% of the cases) and replacing it will solve the no start problem but not always. If there is no continuity, replace the relay and retest. In this post, I am going to teach you how to test a relay with a multimeter . The fuel pump relay is an electronic component that is found on virtually all vehicles equipped with an internal combustion engine. I found how to test the relay with a multimeter, so that's all set. Out of stock until early November 2018 when our newest version arrives How to test a fuel pump relay with a multimeter.

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