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2005 DF70 Suzuki won't start

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  • 2005 DF70 Suzuki won't start

    My 2005 DF70 won't start. These are some of the things I've checked. Fire to the plugs is good , fuel to the injector rail is good. I have power to one wire on the injectors but no power to the other wire. No power to that wire while key is on or turning the engine over. I was thinking the crank sensor could be bad hopefully and not the ecm. Any help would be appreciated.

  • #2
    From 2009 Df90A service manual, Failure symptom: ďWithout the CKP sensor signal input, the ECM does not output the ignition and fuel injection signalsĒ My take on the quote is that you would not be able to turn the engine over and have no fuel to the injectors. Not sure if the fuel pump would power up supplying fuel to the fuel rail but the injectors sould not inject fuel to the cylinders.

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    • #3
      Thanks Murray. I have power to the fuel pump when I turn the key on. It runs for for 4-5 seconds and shuts orr. I'm sure hoping its the sensor. Will find out as soon as it gets delivered.

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      • #4
        Sounds like a fuel issue, the engine is getting enough fuel to start but not enough to keep it running. You have fuel to the fuel rail. What is the fuel pressure? When was the last time anyone worked on the fuel delivery system? What is the maintenance history of the engine? If your CKP sensor is faulty then I wouldnít think the fuel pump would have power.

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        • #5
          The engine won't run at all. Has spark at the plugs. Vst is clean,filters are new,fuel hoses are new, primary fuel pump is new, Iac valve is new. Checked all the fuses I knew to check unless one is hidden somewhere that I don't see.I took the fuel rail off and with the injectors exposed turned the engine over. I'm not getting any fuel at all out of the injectors. One of the wires on the injectors stays hot with the key on but the other wire don't show any voltage at al when i'm turning the engine over. I'm getting fuel up to the injector rail but whatever is supposed to trigger the other wire on the injectors is not doing it.

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          • #6
            E8C4B6F8-DC43-4950-9D03-F2A1AFBA57C8.png

            My service manual shows 3 fuses in the High Pressure Fuel Pump Control System, 30 Amp, 15 Amp and a 40 Amp. A faulty CKP sensor should give you a 4-2 warning code. Iíll attach a screen shot of chert that might help ypu with your issues. Canít help you with the power on the one wire, the manual again goes into a elaborate test procedure using a special tool(injector test cord) My service manual has quite a section on the fuel system, lots of test procedures. If you donít have a service manual Iíd suggest you get one especially electrical issues involving the fuel system. Sorry I canít be more help.
            At my end the chart appears blurry, PM me your email and Iíll try that route.
            Last edited by Murray; 05-13-2018, 04:42 PM.

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            • #7
              Originally posted by Bcribb View Post
              My 2005 DF70 won't start. These are some of the things I've checked. Fire to the plugs is good , fuel to the injector rail is good. I have power to one wire on the injectors but no power to the other wire. No power to that wire while key is on or turning the engine over. I was thinking the crank sensor could be bad hopefully and not the ecm. Any help would be appreciated.
              '''''''''''''''''''''If you have spark the crank sensor is working, if you checked the injector with the plug disconnected you will only have battery voltage on the gray wire on the plug. You need to connect a low powered test light to battery positive and while cranking the engine touch the other wire on the connector with the test light probe, and if the output driver in the ecu is connecting a ground on the transistor the test light will flicker on and off while the engine is cranking. If you tested the injector while it was connected you should have battery voltage on both sides of the plug with the key on.

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              • #8
                Thanks i'll double check the injector wires like you said and get back with a response. I just hope its not the computer. It was replaced last year and still not sure what happened to cause that to go bad.Thanks for your help.
                Barry

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                • #9
                  Originally posted by Bcribb View Post
                  Thanks i'll double check the injector wires like you said and get back with a response. I just hope its not the computer. It was replaced last year and still not sure what happened to cause that to go bad.Thanks for your help.
                  Barry
                  '''''''''''When you check the injector with it connected, connect the test light to ground and probe both wires with the key on the test light should light.

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