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  #1  
Old 02-23-2017, 01:09 AM
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Default OBD0 to OBD1 Swap Issue Fuel Pump Relay Wont Engage

Quick Background on car manual swapped, dpfi to mpfi swapped b20b with P8R head and cams. 4dr 91 civic sedan. Been running fine and dandy on OBD0 other then a permanent IACV code that didnt effect its idle much.

Got the goodies for OBD1 swap. adapters for ecu and distributor, 4 wire o2 sensor obd1 distributor and chipped p06. with strait forward install of adapters distributor swap and ecu swap i went for first start.

Crank no fire. Checked spark lots of spark but found after some diagnoses the main fuel pump relay no longer functions. when you jump pin 8 in the back while the cars in accessory the fuel pump will turn on and run till you pull the wire. any one have any ideas of what to look in to to getting the relay running again?

Tried to be descriptive. Thanks for the help!

Merv
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Old 02-26-2017, 07:49 PM
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Did you sort it out?

Main relay is driven out of the ECU. If it worked prior to OBD-1 conversion, then i'd suspect a bum ECU/chip or less likely a bum conversion harness.

Does the CEL come on at all?
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Old 02-27-2017, 02:23 AM
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CEL stays solid when p2 is jumped, i suspected the ECU was junk or the chip i got, ordered a p75-A51, gonna convert to manual and test run, hopefully will engage pump and ill be able to tell the chip guy i want a new one. scored the ECU on ebay for 50 shipped.

will update soon as its delivered.but being that jumpering the relay while in the harness worked but the only 2 pins that drived it were ECU and it wasent working made me figure bunk chip more then anything.

This ecu came out of my buddy's car that actually ran, only new bit was my chip haha
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Old 03-01-2017, 06:29 PM
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Sounds on point, especially if the ecu came from a known running vehicle. Only difference being the chip, yeah...Probably a bad chip burn or someone burned the wrong rom...

That P75 will need a jumper added/resistor removed to convert it from auto back to manual. Its easy enough... RP17/18 if memory serves...might need to google that to be right tho. It's been a few years since I've chipped one...good news is auto ecu have the chips you need for a vtec conversion if you ever want to do that.

You gonna chip it yourself or just plug it in and go for the B20?

Good hunting, let us know.
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Last edited by Speed Phreak; 03-01-2017 at 06:39 PM.
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Old 03-01-2017, 09:05 PM
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For now its my last fuckery with the car for a minuet. Going to put the p75 in after the manual conversion and if she runs im leaving her alone for now. Ill socket and chip this p75 my self later on. I still have a cam cap leak to fix then drive it nice and easy for a bit.

Hopefully the new ECU is here tomorrow. Fingers crossed.


Ive had enough tickets driving like a dumbass with what shes got for now haha. Cops tend to frown upon slides out of parkinglots...
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Old 03-06-2017, 01:57 PM
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just an update, it was indeed the ECU as far as the fuel pump relay. stock p75 turned it on, only to find out somthing also happened to the CPS in the dizzy -.- one lifetime warantee later and she fired up no problems.

Now i have a glorious IACV CEL... So today is bleed the coolant out again... double check solder joints and try my spare IACV... WEEE!
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