antno Posted September 11, 2016 Share Posted September 11, 2016 am i right in thinking that when you turn the ignition on the fuel pump should run for a period of time to prime the fuel system? cheers anthony Quote Link to comment Share on other sites More sharing options...
Guest Budz86 Posted September 11, 2016 Share Posted September 11, 2016 Yes Quote Link to comment Share on other sites More sharing options...
antno Posted September 11, 2016 Author Share Posted September 11, 2016 Yes /QUOTE] Any idea how long and what would cause it to stop. Also it's it a 12v or 9v feed at that point. Cheers Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 12, 2016 Share Posted September 12, 2016 A few seconds, the main ecu sends a "run the pump" signal to the fuel pump ecu at the back of the car. Without a crank signal the main ecu stops sending the "run the pump" signal after a few seconds. The pump ecu runs the pump at 12V during purge and cranking. Start at the pump and see if it is getting 12V when the ignition is turned on, then work forwards. I am not sure if the engine ecu outputs 12V or 5V or goes to ground as a signal to the pump ecu. A Syvecs expert will know. Quote Link to comment Share on other sites More sharing options...
antno Posted September 12, 2016 Author Share Posted September 12, 2016 A few seconds, the main ecu sends a "run the pump" signal to the fuel pump ecu at the back of the car. Without a crank signal the main ecu stops sending the "run the pump" signal after a few seconds. The pump ecu runs the pump at 12V during purge and cranking. Start at the pump and see if it is getting 12V when the ignition is turned on, then work forwards. I am not sure if the engine ecu outputs 12V or 5V or goes to ground as a signal to the pump ecu. A Syvecs expert will know. Cheers Chris I will have a look. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 12, 2016 Share Posted September 12, 2016 Actually on the VVTi (and I think the none VVTi is the same) The fuel pump control from the main ecu outputs a 0V to 5V Pulse Width Modulated (PWM) signal which is connected to the Fuel Pump ECU to control fuel pump speed. You'd need a `scope to look at that. Quote Link to comment Share on other sites More sharing options...
antno Posted September 12, 2016 Author Share Posted September 12, 2016 Actually on the VVTi (and I think the none VVTi is the same) The fuel pump control from the main ecu outputs a 0V to 5V Pulse Width Modulated (PWM) signal which is connected to the Fuel Pump ECU to control fuel pump speed. You'd need a `scope to look at that. Got an old crypton 336 at work I think that should do the job. I've got a hks piggy back ecu on I wonder if that might be playing up Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.