i just bought a 89' civic hatch and it has a 37820-PR4-A02 ecu and i just want to go over the wires and maby fix some b/c the harness looks beat and i just want to make sure the owner before had things right, so if anyone has a pdfi or anything feel free to email me at weggies4life@yahoo.com or write message me on here

all the thanks, Nick

 

I used to have it on my old comp, took me FOREVER to find it... GL on your search bud.

 

thanks man .. i just searched on here PR4 and everyone that has asked for this pinout had a lot of views but NOBODY has this pinout, its like this ecu was never put in any helm or nothing, i just dont get it

could i look up a diff. ecu pinout that matches the OBD0 pr4

 

I know what you mean, I had a hard time too, I found the 92-93 obd1 pinouts all day when I was searching, if I remember where I found it I would give it to you, and my old comp took a **** and I still haven't fixed it lolz

 

hell ya and OBD0 conversions but im searching more so if i find anything ill be sure to post it up EVERYWHERE i can so ppl like us can have it

 

I have the pin out for obd-O i dunno if that helps? I'm not sure if its ecu specific or not if so sorry for the post:

DPFI MPFI
Pin # Wire Color Function Wire Color Function
A1 Yellow 2 Aux Injector Brown #1 Injector
A2 Black 1 Main Relay/Ground Black 1 Main Relay/Ground
A3 Yellow 1 Aux Injector Red #2 Injector
A4 Black 2 Main Relay/Ground Black 2 Main Relay/Ground
A5 Red 2 Main Injector Light Blue #3 Injector
A6 Green Purge Cut Off Solenoid Valve (Coil) Green Purge Cut Off Solenoid Valve (Coil)
A7 Red 1 Main Injector Yellow 1 #4 Injector
A8 Yellow 3 Sedan LX A/T
A10 Red EGR Solenoid Control Valve (Coil) (A/T only)
A11 Blue/Yellow EACV (Coil) Blue/Yellow EACV (Coil)
A12 Green/Black 2 Main Relay Green/Black 2 Main Relay
A13 Yellow/Black 2 Main Relay Yellow/Black 2 Main Relay/Injector Resistor Box
A14 Green/Black 1 Main Relay Green/Black 1 Main Relay
A15 Yellow/Black 1 Main Relay Yellow/Black 1 Main Relay/Injector Resistor Box
A16 Brown/Black Ground Brown/Black Ground
A17
A18 Black/Red Ground Black/Red Ground
DPFI MPFI
Pin # Wire Color Function Wire Color Function
B1 White/Green Hazard Fuse White/Green Hazard Fuse
B2 Orange Tandem Control Solenoid Valve Blue 1 Fast Idle Control Solenoid Valve
B3 Yellow A/C Clutch Relay Yellow A/C Clutch Relay
B4 Yellow/Green Radiator Fan Relay Yellow/Green Radiator Fan Relay
B5 White/Yellow Alternator White/Yellow Alternator
B6 Green/Orange Check Engine Warning Light Green/Orange Check Engine Warning Light
B7 Green/Orange A/T Shift Position Console Switch (Park, Neutral)
B8 Blue/Red A/C Switch Blue/Red A/C Switch
B9
B10 Orange Crank Angle Sensor
B11 Green/Black A/T Shift Position Console Switch (Drive)
B12 White Crank Angle Sensor
B13 Blue White Main Relay Blue White Main Relay
B14 Blue 2 To Yellow, To Alternator Blue 2 Alternator
B15 White 1 Ignitor Unit White 1 Ignitor Unit
B16 Yellow/Red Speed Sensor Yellow/Red Speed Sensor
B17 White 2 Ignitor Unit White 2 Ignitor Unit
B18
B19 Green/Red Electric Load Detector Green/Red Electric Load Detector
B20 Brown Ignition Timing Adjusting Connector Brown Ignition Timing Adjusting Connector
DPFI MPFI
Pin # Wire Color Function Wire Color Function
C1 Orange Crank Angle Sensor Blue/Green Cylinder Position Sensor
C2 White 4 Crank Angle Sensor Blue/Yellow Cylinder Position Sensor
C3 Orange/Blue TDC Sensor Orange/Blue TDC Sensor
C4 White/Blue TDC Sensor White/Blue TDC Sensor
C5 Red/Yellow TA Sensor Red/Yellow TA Sensor
C6 Red/White 1 TW Sensor Red/White 1 TW Sensor
C7 Red/Blue Throttle (Position) Angle Sensor (TPS) Red/Blue Throttle (Position) Angle Sensor (TPS)
C8 Yellow EGR Lift Valve Sensor
C9 Red/White 2 PA Sensor Red/White 2 PA Sensor
C10 Green/White 3 Brake Switch Green/White 3 Brake Switch
C11 White 1 MAP Sensor White 1 MAP Sensor
C12 Green/White 2 EGR Lift Valve Sensor/Pa Sensor/Ignition Timing Adjusting Connector/TA Sensor/TPS Sensor/TW Sensor Green White 2 Pa Sensor/Ignition Timing Adjusting Connector/TA Sensor/TPS Sensor/TW Sensor
C13 Yellow/White EGR Lift Valve Sensor/Pa Sensor/TPS Sensor Yellow/White Pa Sensor/TPS Sensor
C14 Green/White 1 MAP Sensor Green/White 1 MAP Sensor
C15 Yellow/Red MAP Sensor Yellow/Red MAP Sensor
C16 White 3 O2 Sensor White 3 O2 Sensor

 

that doesn't help, I know for a fact that SOME wire are the same, and SOME change.

 

thats cool man, i appreciate your help though, i found the helm for a OBD0 DA so i dont know if i should post the whole helm up or just put the wireing b/c its like 110 pages

 

If your car was dpfi, then the previous owner needed to do a dpfi-mpfi swap, which explains why you think there are significant differences. If the car was mpfi to start with, then obd0 pr4 is plug and play.. something to keep in mind..

I personally swapped a car running a B18b in a 91 crx si using an obd0 pr4-a02 with no issues.

 

ya i know he had to do that, but im just worrying about the harness in there now b/c idn what he or whoever did to it b/c it looks hacked so i just want to over the wires and make sure there is open circuits anywhere. plus i want to check it b/c my corner lights stay on no matter what i do if the battery is hooked up then there on, so you might agree with me that i need to check things out

 

which corner lights? front or back or both?

 

just the front, i dont even know right now if the backs are plugged in

 

Check the Phearable site, they have a nice one

http://www.phearable.net/tech/wiring/pinouts2.htm

 

hay thanks for that, the funny thing is i even went there but i couldnt find it

 

another wierd thing is, try to understand this b/c its very confusing, the guy has a big RED wire from the battery going to a ground so the RED wire is actually the ground and has a BLACK wire going to the fuse box under the hood. so i didnt know that at the time so i pluged the RED to possitive and BLACK to negative and my dash lights come on and i get the whippers to work, but wen i relized i had the wires backwards on the battery i wondered why everything was still working fine, i then put the BLACK wire on pos. and RED on neg. and i herd a beep but at that time i had the cluster unpluged so im getting alittle weirded out about this

 

yea be careful, I swapped my battery around because of my intake and didn't want it touching, car wouldn't start at all prior and when I went to jump start it with cables and hooked it up backwards said oh **** oops hooked it up correctly... it started!? WEIRD ****! lolz

 

ya all these cars work in mysterical was, sometimes it works and you ask yourself how the hell is that working but you always end up saying **** it just leave it the way it is