steptoe wrote:1. with key on no power at fuel pump plug.
Power should be supplied to the fuel pump (via the ignition key and fuse) so I'd trace back with test light to find where the loss of power is coming from.
steptoe wrote:2. if I jumper the blue and red wire at f/pump relay plug I have battery voltage at pump connector ( already replaced the relay with a known good one )
Ok, so that kinda elminates the first fault (it's not the wiring to the pump) but it still can be the wiring to the relay.
steptoe wrote:3. When green test plugs are connected with the key in the "on position" pump will cycle properly.
Ok, again this shows the wiring to the relay is working (as this is supposed to happen when the green connectors are joined), so I'd start looking at ECU. Try using a good known one to compare.
steptoe wrote:4. after cycling the pump with the test connectors the engine will run for a bit.
This is showing the fuel is getting to the injectors and manifold but due to the ECU not getting the cranking signal, the injectors aren't pulsing anymore (after prime circuit).
steptoe wrote:Also getting a code 12 ( start switch ).
It still shows signs of ECU fault or wire from ignition start switch not getting to ECU.
steptoe wrote:Its a manual and has the neut switch on the clutch pedal, tested it and with the clutch pedal depressed there is no continuity, but I wonder if the fuel pump relay energizing curcuit is tied into the start switch? The conditions dont change based on the neut switch being open or closed either.
The clutch switch is there normally for turning off the cruise control (breaks circuit) and also for engine RPM whilst idle.
steptoe wrote:My best guess is the ecu isnt triggering the fuel pump relay. All my info is on the 4 plug stuff and im not finding what I need to check as far as pin outs and such.
Ok Jonno and Mark, try using that pinout that goes to ignition start circuit or another ECU.
I hope this helps in some way cause I'm not the full bottle on wirings (just enough to get me into trouble) but I'd say Gannon could be your man.
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