Ignition fuse blows during cranking
I fully agree with your analysis. Thank you guys to both of you Noah and you. You guys are great.
Fred
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"Ground cannot be checked with a 10mm socket"
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I just want to take a moment to acknowledge your contributions over the years Monde. People like you make this forum what it is. Thanks for being here with a good attitude and for always being willing to help!
I cannot think of any other reasons at this moment because I am dealing with a car issue myself. Keep us posted.Hi Monde,
I fully agree with your analysis. Thank you guys to both of you Noah and you. You guys are great.
Fred
"Ground cannot be checked with a 10mm socket"
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Latest update on the suzuki.
I put allt he engine parts back ogether and repluged the ECU. Before I crank the truck I tested powers and grounds. B/W wire that feeds the ignition coils had 12 volt also tested the wire from ECU that gets grounded by ECU for the fuel pump and checked out OK. Since the ignition switch was faulty as I mentioned in my earlier e-mails so I just truned the ignition switch on but to crank the engine I coonnected a wiire to S terminal at the starter and touched the poistive post on the battery. The engine first tried to start but was not able since needed more priming due to has sat for years. But now when I try to crank the engine the crank pulley is very tight. and does not rotate freely So I tried to manually rotate thje Cranck pulley I can roate with force and shows resistance. I am not sure the starter may have locked with the flywheel.. Please give me your thoughts what could have happened during the crancking of the engine it is not locked but resist to rotate.? I have disconnected the alternator to take it out of equation.
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I will try your suggestions and report back. Regards, fred.
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This may sound silly, but are you using a good long handled ratchet on the crank pulley bolt or grasping the crank pulley by hand?
There is going to be some resistance whenever a piston is on the compression stroke.
Removing the spark plugs will make it so that no cylinder can build compression. Then you should encounter almost no resistance while trying the engine with a ratchet and socket on the crank pulley.
"Ground cannot be checked with a 10mm socket"
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Hi Monde,
Today I had time to work on the Suzuki. So I charged the battery before trying to crank the engine. After charging the battery, First I tried to check power to ignition coil and checked out good ( 12.3 volt). Then I checked the voltage on the B/w wire feeding the PCM and checkerd OK. 12 volt. Then I checked the power on the starter S wire and to my surprsie was only 8.7 volt. There was a voltage drop of more thna 3 volt. Previously I thought this was caused by faulty ignition switch.but now I have removed the ignition switch and still I am measuring 8.7 volt at the S wire no wonder the car does not start. So I started tracing the black and yellow wire ( S-wire) all the way back to the ECU. This wire per circuit diagram starts out from the ignition switch then slice off one leg goes to the starter and other leg goes to the Transaxle speed sensor. So I separted these wires and disconnected the ECU leg from the leg that goes to the speed sensor. I measured the voltage of the disconnected wir ethat goes into the ECU and shows - 2.25 volt( negative 2.25). So it apperas the ecu is causing the voltage drop. Then I turned the power off and still with power off, the wire terminal at the ECU that control the S wire shows -2.25 ( minus 2.25). I will try to attach a copy of starting circuit. What is your understanding why ECU shows negative 2.25 volt. Does that mean the driver is shorted ? Is there any fix or ECU needs to be replaced. Thanks
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For some reason I can not post pictures,but here is the link to the Suzuki starter circuit. Thanks
zinref.ru/avtomobili/Suzuki/005_Suzuki%2...2007_english/147.htm . Or just google 2004 Suzuki grand vitara starting system diagram.
I will measure the voltage and report back. Based on yesterday at the splice the voltage was 8.7 volts at the computer disconnected was -2.5 volt. But I will remeasure to be sure.
Thanks
Fred.
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"Ground cannot be checked with a 10mm socket"
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- Posts: 4429
- Thank you received: 962
"Ground cannot be checked with a 10mm socket"
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The connection are correct as you described it. When I remeasured, the voltage the highest I can see on the Yellow /Black S wire is 9-10 volt still I am missing 2 volts. Also, Engine still is not cranking. As I said my ignition switch is messed up and I opened it and put it back together but still not working as it should. So I by pass it. But the good news , at the computer I am not seeing the negative voltage by the ECU pin that controls s wire. I am still trying to see where I am losing the 2 volts. The battery is fully charged and shows a voltage iof 12.71.
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I have found a bad ground and I am suspecting the voltage drop at the S-wire ( Black/yellow wire) was caused by the bad ground.
Since as I mentioned in my previous replies that my ignition switch was messed up so I ordered one on line and and I should receive it by this weekend. The good news the ECU is fine and the bad ground has not caused any damage to it. Also the voltage at the ECU is zero now after correcting the ground. So once I receive the ignition switch then I will resume working on the resolution and follow your suggestion Monde on measuring the voltage close to the Transaxle sensor and the s-wire at the iginition switch.
Thank you both for the continous support and guidance.
Fred
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I agree with what you said and Iwill perform the tests once I receive the switch. In the mean time I want to thank you for the video from Scanner danner. I am a fan. Regards, fred
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I agree with what you said and Iwill perform the tests once I receive the switch. In the mean time I want to thank you for the video from Scanner danner. I am a fan. In the meantime I do have a question what is ther ole of PCM in case of 2004 suzuki. It is not grounding any relay. What does it do?
Thanks so much for all your help. fred
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I received the new gnition switch on Friday and Installed today on Saturday. I measured the voltage with ignition switch on on the S wire at the starter and the wire going into the ECM both showed 8.9 -9 V. Then i cranked the engine then the voltage moved up to 12.4 sincve battery was just charged. So I do see I am getting battery voltage at the S-wire ( No voltage drop) but why Iam still getting 9 V with Ignition on and engine off. I will look at the video you sent me hopefully I get some hints. Any thoughts. I recently put all he engine components back together and i hate to pull it a part again. But 9 volt with only igntion switch oon is a sign of trouble that I started from the begining I suspected the ignition witch but now with a brand new one still I am having the same issue. Thanks fred
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"Ground cannot be checked with a 10mm socket"
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