Shortly after my last post I managed to get the car started. Don't ask me how. The things I did were...
- Removed pump from car and put 12v on motor connectors - Pump worked OK.
- Found the ECU relay (Also referred to as: Fuel Relay, Engine Management Relay). Mine is black and mounted on the back of the ECU housing. It had a cracked housing and was loose. took it off, opened the housing and assessed the contacts. All looked ok.
- Checked the Red topped button (Fuel cut-off; Inertia switch), near to the ECU relay. Checks out fine. Switch closed OK.
So after a lot of Bu&&ering about I turned the ignition into the 2nd position and I could hear the fuel pump prime for several seconds. Engine fired up perfectly and ran for a couple of weeks.
Now.... I have been away for a couple of weeks and guess what? Yes, the car won't start. So, not knowing what I did last time, I repeated my efforts...
- Pump out and runs off 12v supply.
- Relay out (tapped)
- Cables wiggled a bit
- Checked the inertial switch
But, nothing has worked.
I joined good old Haynes and signed up for on-line manual, just to get the elec dwgs. So now armed with a bit more info, I couid check the wiring supply voltage. Well, it would appear that the relay for the pump is not closing, not supplying 12v from pin 8 to pin 5 of the relay. Pin 5 then goes to the inertia switch which is where i could check for 12v (Nothing there). So I removed the relay housing and witnessed the inactivity on the right-hand relay. If I manually close the relay the pump will run, and if I over-ride the relay to be on, the pump runs and the car will fire up ok. Not sure this is good for the car!
So, the pump works, the inertia switch seems OK, but the relay is not closing. Now, this is where things get a little vague. The relay seems to have some other electronics, which I suspect turn the pump off, but not sure how or why. This would normally be backed up by the pump stopping after initial priming before teh engine is tuned over.
My questions are...
1. Is it a faulty relay? - I have a new one due tomorrow, so will rule this in/out.
2. What else controls the relay? Seems that the additional electronics are wired back to the ECU.
3. Does anyone know or understand the control methodology of the ECU? What would cause the control to cut-off fuel, turning the relay off?
Sorry. Petrol 1.4i LX
- Removed pump from car and put 12v on motor connectors - Pump worked OK.
- Found the ECU relay (Also referred to as: Fuel Relay, Engine Management Relay). Mine is black and mounted on the back of the ECU housing. It had a cracked housing and was loose. took it off, opened the housing and assessed the contacts. All looked ok.
- Checked the Red topped button (Fuel cut-off; Inertia switch), near to the ECU relay. Checks out fine. Switch closed OK.
So after a lot of Bu&&ering about I turned the ignition into the 2nd position and I could hear the fuel pump prime for several seconds. Engine fired up perfectly and ran for a couple of weeks.
Now.... I have been away for a couple of weeks and guess what? Yes, the car won't start. So, not knowing what I did last time, I repeated my efforts...
- Pump out and runs off 12v supply.
- Relay out (tapped)
- Cables wiggled a bit
- Checked the inertial switch
But, nothing has worked.
I joined good old Haynes and signed up for on-line manual, just to get the elec dwgs. So now armed with a bit more info, I couid check the wiring supply voltage. Well, it would appear that the relay for the pump is not closing, not supplying 12v from pin 8 to pin 5 of the relay. Pin 5 then goes to the inertia switch which is where i could check for 12v (Nothing there). So I removed the relay housing and witnessed the inactivity on the right-hand relay. If I manually close the relay the pump will run, and if I over-ride the relay to be on, the pump runs and the car will fire up ok. Not sure this is good for the car!
So, the pump works, the inertia switch seems OK, but the relay is not closing. Now, this is where things get a little vague. The relay seems to have some other electronics, which I suspect turn the pump off, but not sure how or why. This would normally be backed up by the pump stopping after initial priming before teh engine is tuned over.
My questions are...
1. Is it a faulty relay? - I have a new one due tomorrow, so will rule this in/out.
2. What else controls the relay? Seems that the additional electronics are wired back to the ECU.
3. Does anyone know or understand the control methodology of the ECU? What would cause the control to cut-off fuel, turning the relay off?
Sorry. Petrol 1.4i LX