Car will not start, no fuel pressure and pump does not turn on

Tiny
DANIEL_VE-
  • MEMBER
  • 2008 SUZUKI FORENZA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
Checked voltage at the pump and has only 5 volts. Checked fuses and replaced relay. Cannot find why there is only 5 volts at fuel pump connector.
Friday, January 3rd, 2020 AT 4:08 PM

10 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This sounds like you have some unwanted resistance in your vehicle's fuel pump circuit. In the diagrams down below I have included the engine management wiring diagrams for your vehicle including the fuel pump circuit which I high lighted for you and guides on how to find unwanted resistance using the voltage drop method. Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Friday, January 3rd, 2020 AT 10:18 PM
Tiny
DANIEL_VE-
  • MEMBER
  • 6 POSTS
After checking the diagrams you provided it seems I was checking voltage at the wrong wires. I have checked voltage at gray and black wires and I have 0 volts. There is also 0 volts at the fuse with key on and also while cranking engine. There is no initial prime of fuel pump either. Seems I am not getting signal to relay from ECM. Would it be a faulty ECM? Or is there anything else I can check before replacing ECM? Also would this ECM need to be programmed by dealership or could I just pick one up at a junk yard? Thanks in advance, this has been of great help.
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Saturday, January 4th, 2020 AT 5:16 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Check Ground 107, on the lower right side of the engine. Make sure that it is clean, corrosion free, tight, and making good metal to metal contact. Please get back to us with what you find out, and we can go from there, if necessary.

Thanks,
Alex
2CarPros
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Saturday, January 4th, 2020 AT 3:59 PM
Tiny
DANIEL_VE-
  • MEMBER
  • 6 POSTS
Hi Alex,
I checked the ground and it was in good condition. I got 12 volts while touching the positive battery terminal and ground 107. I went ahead and cleaned it just in case and reconnected. Still no power to fuse.
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Saturday, January 4th, 2020 AT 4:37 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Okay, so I would recommend replacing the fuel pump relay. Please get back to us with how everything turns out, and we can go from there, if needed. Here is a link below explaining how to do that, if needed:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Thanks,
Alex
2CarPros
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Saturday, January 4th, 2020 AT 6:40 PM
Tiny
DANIEL_VE-
  • MEMBER
  • 6 POSTS
I replaced the fuel pump relay and still nothing. Do you know if the ecm could be swapped with a used one without needing programming or is this something only a dealership can do? Or could it be possibly ignition switch?
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Saturday, January 4th, 2020 AT 11:32 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Let's make sure that there isn't an open in the light green wire that goes from pin 43 of the Engine Control Module9ECM] to pin 10 of connector 106, which connects to the engine room fuse and relay block. This is the wire that provides power to the coil of the fuel pump relay. In the diagrams down below I have included a guide on how to find intermittent electrical connections and a guide on how to find opens in an automotive electrical circuit for you. Please go through these guides and check the light green wire. If there isn't anything wrong with this wire, then, we can say the ECM has a bad driver and go from there. Please let us know.

Thanks,
Alex
2CarPros
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Sunday, January 5th, 2020 AT 2:57 AM
Tiny
DANIEL_VE-
  • MEMBER
  • 6 POSTS
Thank you again for all your help. I checked the light green wire and checked for continuity and the wire is in good condition. How would I check for a bad driver at the ECM?
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Sunday, January 5th, 2020 AT 7:31 AM
Tiny
DANIEL_VE-
  • MEMBER
  • 6 POSTS
Maybe it’s worth mentioning but I went ahead and jumped pins 30 & 87 at the relay. That gave me 12 volts at the fuse but not at the fuel pump connector.
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Sunday, January 5th, 2020 AT 2:44 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Okay, so the problem is an open in the light green wire or the fuel pump electrical connector. Just using the DMM and having it set to Ohm's is not a good way to test to see if the wire is good. I have sent you a guide on using voltage drop earlier and it is a much better method for this. If even one strand of wire is intact it will give you a continuity reading, but in reality, there is no way for any amount of amperage to pass through this one strand of wire. A voltage drop test will show this bad spot of wire though. That is why it is the preferred method to show unwanted resistance and how I would recommend testing the light green wire. Please get back to us with how everything turns out.

Thanks,
Alex
2CarPros
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Sunday, January 5th, 2020 AT 5:26 PM

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