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Old 06-19-2015, 09:44 AM   #1 (permalink)
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Default '04 Forenza won't start

I have a 2004 Suzuki Forenza. I was driving it and it began to lose power (like Catalytic converter was plugged or MAF was dirty) but then it smoothed out and began to run normal. It began the lose power again an stalled. I have been unable to get it to start again. I did a fuel pressure test and it had no pressure. I can hear the fuel pump come on when I turn the ignition. I know this directly points to the fuel pump but... In the fuse box under the hood, I am getting NO power to the fuel pump fuse (15A). I have checked the fuel pump relay and its fine. I am testing with a volt meter and have tested with the fuse as well as directly to the contacts with the ignition on. I also changed the MAP and cleaned what I think is the MAF (I have a Mercedes that acted the same way and the MAF was bad..No fuse issues though). I checked the 5V fuse under the ECU and it is fine as well. Any idea why I am getting no power to the Fuel Pump fuse? Is that the problem or do I just need to replace the pump? Thanks in advance.
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Old 06-23-2015, 09:34 AM   #2 (permalink)
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Originally Posted by TyVadale View Post
I have a 2004 Suzuki Forenza. I was driving it and it began to lose power (like Catalytic converter was plugged or MAF was dirty) but then it smoothed out and began to run normal. It began the lose power again an stalled. I have been unable to get it to start again. I did a fuel pressure test and it had no pressure. I can hear the fuel pump come on when I turn the ignition. I know this directly points to the fuel pump but... In the fuse box under the hood, I am getting NO power to the fuel pump fuse (15A). I have checked the fuel pump relay and its fine. I am testing with a volt meter and have tested with the fuse as well as directly to the contacts with the ignition on. I also changed the MAP and cleaned what I think is the MAF (I have a Mercedes that acted the same way and the MAF was bad..No fuse issues though). I checked the 5V fuse under the ECU and it is fine as well. Any idea why I am getting no power to the Fuel Pump fuse? Is that the problem or do I just need to replace the pump? Thanks in advance.
You say that you can hear the fuel pump run with the ignition turned on. So, my next question is, why bother with the fuel pump relay? In your testing, you are missing something in your diagnostics. If there was no power to the fuel pump fuse, then the fuel pump wouldn't run. Here's a link to the manual which may help you with the electrical troubleshooting https://www.suzuki-forums.com/suzuki-...i-forenza.html
Good luck on your repair!
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