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Loss of spark and no injector Pulse

Tiny
BBGP
  • MEMBER
  • 1997 HONDA PRELUDE
  • 160,000 MILES
I have a 1997 Honda prelude.I went to start it one morning and no go.I have fuel pump and pressure.I have tested out main relay and is good.I have performed test on ICM and tests good. These are the symptoms. Turn Ignition to on position and fuel pump primes. Crank and get good clean blue spark for one revolution on #1 cal. Or full spark when tested at coil wire. Have battery voltage at injectors but no pulse.I have replaced TDC/CRK sensor with proved good one, but still loose spark after 4 zaps and have no injector pulse.I have no check engine codes, and light is functioning properly. When I turn ignition to the on position I have no immobilizer light don't know if it might be burnt out. If I feed fuel manually through throttle body engine will fire for the one revolution of spark and tach. Reads.I have tested all grounds and they good. Did basic testing at ECM and have feed and voltage but don't have much info for testing at pins. Any input would be greatly appreciated
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Friday, August 16th, 2013 AT 7:37 PM

4 Replies

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
Well, you have eliminated most of the probable causes of the issue. My best advice is to get and OBD scanner and pull the trouble codes. That may give you some idea of the issue that is causing the problem.
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Friday, August 16th, 2013 AT 7:42 PM
Tiny
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  • 3 POSTS
I have a scan tool but it is only good for obd 2 and don't have any codes on obd 1 that I can read. There is some way of reading them by grounding the conector but not how to do it.
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Friday, August 16th, 2013 AT 8:05 PM
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
On Hondas there is a way to run a shunt or run a wire on a connector from one wire to it's other wire. You have to be sure it is the right connector though. You can go to Advance Auto or Auto Zone and look in a Chilton's Manual for your car or a model year of Honda like your car and look up the OBD test. You will get a series of Morse code type pulses on the ECU LED or the check engine light. You can get and OBD 1/2 reader for less than $50.
If you can't find a Chilton's Manual for your car you might want to order one online. They have really good wiring diagrams and pictures that are very helpful as well as things like the OBD test. The OBD test will require that you have the chart in the Chilton's to translate the code. So, if you don't buy one, bring a note pad to write down the codes. There are a lot of them, but I doubt anyone will question what you are doing. Also read the instructions for how to read double digit codes.
I hope this helps.
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Saturday, August 17th, 2013 AT 12:45 PM
Tiny
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  • 3 POSTS
Hi DrCranknWrench, I would like to thank-you for all your help.I have discovered that it was a broken wire to the pass lock immobilizer as I was not receiving the green key light. This is my wifes car and I never drive it. Lol, thanks so much again!
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Monday, August 19th, 2013 AT 6:54 PM

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