Need some help.. when key is on the ON postion check engine light flashes

**Brent** · 05-01-2006, 11:42 PM

When I turned my key to the ON postion but do not crank the car the battery light and check engine light come on and after a few seconds the check engine light will flash on and off fast and there will be a loud clicking noise that will go on and off with the check engine light. Anyone experience this before?

12second5.0 · 05-02-2006, 12:05 AM

Is your CEL light on while running?

**Brent** · 05-02-2006, 12:12 AM


Quote: Originally Posted by 12second5.0 Is your CEL light on while running?

No... but the car only runs for 15-20 seconds and revs wildy while it is running

**Brent** · 05-02-2006, 01:14 AM

My fuel pump it wont stop priming. I turn the car to the on postion and it just keeps whining.

**Herbstang** · 05-02-2006, 08:34 AM

check the fuel pump relay in the module power . If you have power in and no out, you need a module. If you have power out and not at the pump, run a new wire to the pump, and clean the ground for the pump while in their. If you have no power at the relay, the ecm supplies it when key is on, you need a module as the ecm relay, and the fuel pump relay are not powering up. If you have no power at the ecm relay, Check fuse in central box, and fuel, and ecm fuse in dash panel relay panel.

**Herbstang** · 05-02-2006, 09:18 AM

The battery sources the power to the fuel pump through the fuel pump relay. The fuel pump relay control coil gets power from the computer and the computer completes the circuit by providing a ground. This closes the fuel pump relay contacts. Battery power then flows through the closed relay contacts to the fuel pump.

The computer is programmed to turn the fuel pump relay on and off according the needs of the engine.

You have one of four problems:

1.) A failed fuel pump relay: relay contacts have stuck closed.

2.) A short to ground in the computer to fuel pump relay control circuit. The fuel pump relay is located under the driver's seat. The green wire going from the fuel pump relay to pin 19 on the computer may have a place in it that has rubbed bare and is shorting to ground. The computer test connector under the hood on the driver's side of the engine also has a wire that connects to pin 19 on the computer. It is used to test the fuel pump circuit by grounding it to make the fuel pump run all the time. If someone jumpered it to ground, it would be just like a short to ground.

3.) Someone has crosswired your car. This could be difficult to fix, since the bad wiring could be hidden in a number of different places.

4.) Failed computer - not very likely, since the computers are not prone to failure.

See http://www.veryuseful.com/mustang/te...nks-ign-ac.gif for Tmoss's wiring diagram

**Brent** · 05-02-2006, 11:29 AM

Thanks for the info. After reading this is sounds like it could be the fuel pump relay

**Herbstang** · 05-02-2006, 02:26 PM

If I have been of service, if I have glimpsed more of the nature and essence of ultimate good, if I am inspired to reach wider horizons of thought and action, if I am at peace with myself, it has been a successful day.

**SpectorV** · 05-02-2006, 03:24 PM

if your car wont crank make sure the shifter is in park

**Brent** · 05-02-2006, 04:40 PM


Quote: Originally Posted by Herbstang If I have been of service, if I have glimpsed more of the nature and essence of ultimate good, if I am inspired to reach wider horizons of thought and action, if I am at peace with myself, it has been a successful day.

Consider it a successful day

My car breathes! It was the CCRM thingy that controls the fuel pump. Took it off cleaned the connections and she drives like before.

**Herbstang** · 11-14-2006, 01:39 PM

**SpectorV** · 11-14-2006, 02:23 PM

why would you reply to a thread this old.... closed!