Vehicle starts and shuts off

Tiny
JAMES MUCHENE
  • MEMBER
  • 1995 SUZUKI GRAND VITARA
  • 2.0L
  • V6
  • 4WD
  • MANUAL
  • 100,000 MILES
I followed your demonstration of checking the COP circuit. When the ignition is in the on position, the coil sockets have the equivalent of the full battery power, approximately 13 volts.

The car starts normally and then dies after a few seconds. The OBD code is 12, meaning no error is detected. Please confirm that the voltage when ignition is on (without cranking should be zero). Then where is the voltage coming from. It would have to come from the ignition switch.
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Wednesday, September 18th, 2019 AT 8:17 AM

6 Replies

Tiny
94 TRANSAM
  • EXPERT
Hi, welcome to 2CarPros.

We have zero information on this vehicle so I cant provide wiring diagrams but the systems were pretty standard back then. Unfortunately OBD1 computers were very limited in diagnostics so I am not surprised your not showing any codes.

Yes you should have 12 volts at the coil with the key on. The pulse wire next to the power should read 0 until you crank it.

Your power should come from either the ignition switch or the computer.

Let me ask a question. When you start it and it dies will it start right up again and then die again right away or will it not start for a while?

Rich
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Thursday, September 19th, 2019 AT 8:22 PM
Tiny
JAMES MUCHENE
  • MEMBER
Hi Rich, Thanks and regards from sunny Kenya in East Africa. Yes, the car will start immediately and shuts off again after about 3 seconds.I had downloaded a manual that has the ignition wiring diagram on this link. It is not possible to attach the manual to this reply. File:///home/chronos/u-802ff4147db374fb7e5ae7073a7f8e9bd2e86b23/MyFiles/Downloads/New%20Folder/suzuki%20manual99501_85F20. Pdf
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Friday, September 20th, 2019 AT 1:06 AM
Tiny
94 TRANSAM
  • EXPERT
I can't open the address you posted. I am guessing it a system issue from here to there.

Anyway, what steps have you taken to confirm you are losing spark after 3 seconds? Because this could be several things and spark wouldn't be at the top of my list.

Rich
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Friday, September 20th, 2019 AT 5:53 PM
Tiny
JAMES MUCHENE
  • MEMBER
Hi Rick,

Further to my reply, I would like to add that the coil on plug has two pins. This must mean then that voltage (12 volts) is sent from the ECM, since one of the wires must be ground. As indicated in my first email, when I connect the two wires to a multi-tester when ignition switch is "ON", ( they are showing a constant 13 volts ). This can't be right? How then is the spark created?
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Saturday, September 21st, 2019 AT 2:46 AM
Tiny
JAMES MUCHENE
  • MEMBER
Hi Rick, I have just managed to solve the problem.
Many thanks.
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Saturday, September 21st, 2019 AT 5:46 AM
Tiny
94 TRANSAM
  • EXPERT
Any time. We are here to help. Good luck and have a great day!

Rich
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Saturday, September 21st, 2019 AT 11:05 AM

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