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Intermittent spark and no injector pulse.

 
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Old 06-27-2014, 07:54 PM
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Intermittent spark and no injector pulse.

Hey guys, I'm new here. I picked up an 00 Prelude 5 speed and it has a no start condition. It has spark for the first 3 revolutions and then it stops sparking, the injectors are getting power, but no ground pulse from the ECU. All grounds are clean and tight, the CKPS and TDC sensor ohm at 2.5K and the ohms jump as the engine is turned. Immobilizer is functioning correctly, ignition switch was bad and now replaced. All fuses are good. The tach isn't moving while cranking and the live data on my scanner shows 0 RPM when cranking the engine over.

Where I am standing, it looks like it's either the CKPS or the ECU. Any other input or theories would be appreciated.
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Old 06-27-2014, 08:10 PM
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Re: Intermittent spark and no injector pulse.

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Originally Posted by JC316 View Post
Hey guys, I'm new here. I picked up an 00 Prelude 5 speed and it has a no start condition. It has spark for the first 3 revolutions and then it stops sparking, the injectors are getting power, but no ground pulse from the ECU. All grounds are clean and tight, the CKPS and TDC sensor ohm at 2.5K and the ohms jump as the engine is turned. Immobilizer is functioning correctly, ignition switch was bad and now replaced. All fuses are good. The tach isn't moving while cranking and the live data on my scanner shows 0 RPM when cranking the engine over.

Where I am standing, it looks like it's either the CKPS or the ECU. Any other input or theories would be appreciated.
im voting ckps the only time ive ever seen a honda ecu fail was from someone who didnt know what they were doing and hooked a charger up to the battery backwards . reversed the polarity of the battery and tore up all kinds of parts . if the ecu was seeing pulse from the ckp it would be showing revs even when just cranking .
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Old 06-27-2014, 09:48 PM
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Re: Intermittent spark and no injector pulse.

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Originally Posted by element600rr View Post
im voting ckps the only time ive ever seen a honda ecu fail was from someone who didnt know what they were doing and hooked a charger up to the battery backwards . reversed the polarity of the battery and tore up all kinds of parts . if the ecu was seeing pulse from the ckp it would be showing revs even when just cranking .

^^X2
It does sound like it is more likely to be the crank sensor
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Old 06-27-2014, 11:11 PM
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Re: Intermittent spark and no injector pulse.

We will see. Ordered one, should be in tomorrow.
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Old 06-28-2014, 07:32 PM
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Re: Intermittent spark and no injector pulse.

Swapped it out and checked the wiring all the way to the ECU. Still not working. Still have spark for a few revolutions, still have no RPM signal on live data. Guess I need to start shopping for an ECU.
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Old 06-29-2014, 06:38 PM
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Re: Intermittent spark and no injector pulse.

did you check the resistance on your coil?
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Old 07-04-2014, 06:08 PM
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Re: Intermittent spark and no injector pulse.

It was the ECU. Got lucky and found an ECU/Immobilizer/Key combo on ebay. Swapped it out and it fired right up. Thanks for the help.
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Old 07-04-2014, 06:13 PM
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Re: Intermittent spark and no injector pulse.

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Originally Posted by JC316 View Post
It was the ECU. Got lucky and found an ECU/Immobilizer/Key combo on ebay. Swapped it out and it fired right up. Thanks for the help.
Awesome man! Glad you were able to get all of that taken care of, congrats
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