I've been poring over the wiring diagrams and pinouts for the DPFI PM5 that's in my car and the MPFI P06 that's in my (potential) donor car. Making my own harness adapter to convert to OBDI seems pretty straightforward, move wires around etc. just lots of time. I also understand that I need to run the extra wires for the 2 new injectors and the CYL sensor.
Which ECU will give better performance, the OBD0 PM6 from the Si or the OBD1 P06 from the '93 DX? Is there even a difference in the fuel map?
The PM5 I'm looking at has pins for an Atmospheric Pressure Sensor, which I cannot find on the P06. Did they do away with the APS for the P06/PM6?
PM5 also has pins for a device called an "ELD Unit" which I can't find on the P06 either. Did they do away with the "ELD Unit" (whatever the hell that is) on the P06/PM6?
On the OBD0 harness (PM5) I also show a "Ignition Timing Adjust Connector" that uses the Grn/Wht supply voltage wire for the TPS, Intake Temp, Coolant Temp, and does
something before going back into the ECU. What does that thing do? I can't find anything similar on my OBD1 (P06) harness.
I'm so close to finishing the research part of this project I can smell it.... It smells like.... solder fumes.
-rp
Originally Posted by
jlicrx
since the car was DPFI, it doesn't have wiring in the cabin harness going to the firewall for the extra 2 injectors nor the 2 wires for the Cylinder Sensor in the distributor - this is the wiring that needs to be added to your DPFI engine harness to convert it from DPFI to MPFI - you will need to do this regardless of whether you run it OBD0 or OBD1 - once you have done that, you will have the necessary wiring and can use the OBD0 PM6 ECU from the 88-91 Si along with OBD0 distributor - going to OBD1 will require that you purchase the OBD0 to OBD1 jumper harness that allows you to plug the cabin wiring harness into the OBD1 ECU and you would need to wire up the 4 wire O2 sensor - if this was a VTEC engine, then i would strongly recommend converting it to OBD1, but since it is non-VTEC, then OBD0 will work fine - as long as you use the OBD1 injectors from the B7, you won't need an injector resistor box - pretty simple to stay OBD0