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OBD0 to OBD1 coversion, the car won't start.

Old 01-08-2006, 11:09 AM
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Default OBD0 to OBD1 coversion, the car won't start.

I have a DOHC ZC engine in '90 CRX.
I made an ECU harness (using P28 ECU), made a distributor harness (using TD60U - H22 distributor) all by myslef. Let's say they both work. Now, the car won't strat. One reason for this is that there is no fuel. I am using stock injectors with a resistor box. Might this be the reason why there is no fuel? First i'd like to get rid of this problem. Has anyone any experiences, what might be the problem?

OBD0 ECU has a led that blinks when there is a failure. What about OBD1? If i'm not mistaken the check engine light should be blinking? What about when making OBD0-OBD1 on a '90 CRX, will check engine light blink too? Or how can i read the code?

Thanks for help
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Old 01-08-2006, 08:57 PM
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Default Re: OBD0 to OBD1 coversion, the car won't start.

You need to ground a particular pin wire (cant remember off the top of my head which one it is at the moment) to get the CEL dash light to blink your particular code when using an OBD1 ECU with a conversion harness.

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Old 01-08-2006, 11:11 PM
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Default Re: OBD0 to OBD1 coversion, the car won't start.

You'll have a solid CEL with OBD1 if there is anything to read... unless you jump the check connector, then it is solid CEL with no codes and blinks with codes.

88-89 has an underhood along driver's fender 2p connector for "checking timing" that you can jump to check codes.

90-91 has a 2p timing check plug by the pass kick panel, similar to most OBD1-2 vehicles.

Is it just no fire, or no fire and no fuel?
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Old 01-09-2006, 05:10 AM
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Default Re: OBD0 to OBD1 coversion, the car won't start.

There is a spark, but no fuel - sparkplugs are dry. Do OBD0 injector with resistor box work on P28 OBD1 ECU? I tried with connected and disconnected resistor box, but no fuel.
What do you mean by "you can jump the connector"? Sorry, english isn't my native language
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Old 01-10-2006, 04:18 AM
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Default Re: OBD0 to OBD1 coversion, the car won't start.

Originally Posted by CRX-ZC
There is a spark, but no fuel - sparkplugs are dry. Do OBD0 injector with resistor box work on P28 OBD1 ECU? I tried with connected and disconnected resistor box, but no fuel.
What do you mean by "you can jump the connector"? Sorry, english isn't my native language
"jump the connector" translates to "jam a ------ paperclip in the connector" lol but seriously..thats how you do it, just stick a paper clip in both sides...

also i have done several OBD0-1 conversions, and i have never seen or done the above to check the codes i have always grounded D3 to the chassis to get the CEL to blink....
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Old 01-10-2006, 07:33 AM
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Default Re: OBD0 to OBD1 coversion, the car won't start.

Originally Posted by turbohf
"jump the connector" translates to "jam a ------ paperclip in the connector" lol but seriously..thats how you do it, just stick a paper clip in both sides...

also i have done several OBD0-1 conversions, and i have never seen or done the above to check the codes i have always grounded D3 to the chassis to get the CEL to blink....
Thanks, got it
Any idea why i don't get fuel? With stock OBD0 injectors + resistor box you always got fuel after OBD1 conversion?
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Old 01-12-2006, 11:11 AM
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Default Re: OBD0 to OBD1 coversion, the car won't start.

Everything works now. Firing order was wrong :P Well, timing is way off with a OBD1 ECU and TD60U distributor, but hey, it fired up
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Old 01-19-2006, 05:55 AM
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Default Re: OBD0 to OBD1 coversion, the car won't start.

Originally Posted by turbohf
i have always grounded D3 to the chassis to get the CEL to blink....
D3 is a knock sensor if i'm not mistaken.
So you grounded D3 from OBD1 ECU?
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