- This page references our TIPM Plug-In Relay System or TIPM Plug-In Relay System (Lite)
- Both of these systems contain a PUMP ON green LED that is integrated into the design, per the red arrows shown below. This LED will be lit when power is flowing to your fuel pump, which is the primary purpose of our parts.
- Verify the fuses in our part are not blown, since this will cause the PUMP ON green LED to not be lit and it will prevent power from flowing to your fuel pump. Fuses should be checked visually and with an ohm meter.
- Find a friend who can help you attempt to start your vehicle while you watch the PUMP ON green LED. With the Lite version of the TIPM Plug-In Relay System, you will need to connect the included temporary ground wire per the part instructions in order the make the LEDs light up.
- Attempt to start the vehicle.
If the vehicle will not start, but the PUMP ON green LED is lit, our part is working properly and delivering power to your fuel pump as designed. The most common issues we see in this situation are:
- Cam or crank shaft sensors
- Fuel pump has failed. Electrically test your fuel pump using a TIPM bypass cable or TIPM Plug-In Relay System when the vehicle is off to ensure the pump is working properly.
- Electrical connectors under the TIPM corroded or not making good connections.
If the vehicle will not start but the PUMP ON green LED is not lit during engine cranking, the most common causes are:
- Ground wire not connected properly to make LEDs light up
- Blown or missing fuses in our part
- K4 run/start relay that plugs into your TIPM has failed (try swapping it for another similar relay in the fuse box to confirm)
- Our part has failed in some way.
NOTE: If you don't have our parts, you can always use a multimeter or test light with one lead placed on top of the fuel pump fuse (M25 or F70) and the other lead to chassis ground or battery negative terminal to detect voltage. If using a multimeter or test light, you are trying to detect the presence of 12 VDC across the fuel pump fuse, which should only appear during engine cranking or while running. A lack of 12 VDC often indicates a faulty fuel pump relay.