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Discussion Starter · #1 · (Edited)
Just posting as i've never really seen a write up on doin this...

So, as I was not happy logging with the Hybrid setting on my '96 VR4, I decided to do a little experiment and see if I could successfully swap a hybrid 95 ECU (MD192589) into my car and log with the Mitsu setting. I know some people have swapped a hybrid ECU into a 96 without swapping any pins and having it work, but I actually got a service manual out (thanks to neverenoughhp) and swapped about 7 or 8 pin assignments and grounded 4 other wires coming into the ECU (O2 heaters). Car seems to be functioning fine, and have no CEL's. Good news is, EvoScan is humming right along at about 60 samples/sec.:muahaha:

Heres the data:
Pin 1995 ECU (MD192589)
1 No 1 Injector
2 No 3 Injector
3 No 5 Injector
4 Stepper Motor Coil (A1)
5 Stepper Motor Coil (B1)
6 EGR Solenoid
7 Fuel Pressure Solenoid
8 MFI Relay (fuel pump)
9 Evap emission purge solenoid
10 Ignition power transistor unit A
11 Ignition power transistor unit C
12 Power Supply
13 GND
14 No 2 Injector
15 No 4 Injector
16 No 6 Injector
17 Stepper Motor Coil (A2)
18 Stepper Motor Coil (B2)
19 Volume Airflow reset sig
20 Fan Motor relay (Hi)
21 Fan Motor relay (lo)
22 AC relay
23 Ignition power transistor unit B
24 Electric load switch
25 Power Supply
26 GND

31 Fuel Pump relay 2
32 Turbo wastegate solenoid
33
34 Muffler mode changeover switch
35 valve open/close indic signal
36 CE/malfunction indicator lamp
37 Power steering pressure switch
38 MFI Relay (power supply)
39 ???????
40 ???????
41 Turbo meter
42 ????????
43 ???????? (A/T control?)
44 Anti lock braking signal
45 AC Switch 1
46 (A/T control?)

51 ????
52 Ignition timing adjustment
53
54
55
56
57
58 Engine Ignition Signal
59 AC Switch 2
60 Heated O2 sensor (rear)
61 AC Switch 2
62

71 Ignition Switch - ST
72 Intake Air Temp sensor
73 EGR Temp Sensor
74 O2 sensor heater
75 Heated O2 sensor (front)
76 Heated O2 sensor (front)
77 O2 sensor heater
78
79 ??????
80 Back up Power Supply
81 Sensor Impressed Voltage
82 Ignition Switch: IG
83 Water Temp Sensor
84 Throttle pos sensor
85 Barometric Pressure Sensor
86 Vehicle Speed sensor
87 Closed throttle pos switch
88 Camshaft pos sensor
89 Crankshaft pos sensor
90 Volume Airflow Sensor
91 GND
92 GND

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Pin 1996 ECU (MD319639)
1 No 1 Injector
2 No 3 Injector
3 No 5 Injector
4 Stepper Motor Coil (A1)
5 Stepper Motor Coil (B1)
6 EGR Solenoid
7 valve open/close indic signal
8 MFI Relay (fuel pump)
9 Evap emission purge solenoid
10 Ignition power transistor unit A
11 Ignition power transistor unit C
12 Power Supply
13 GND
14 No 2 Injector
15 No 4 Injector
16 No 6 Injector
17 Stepper Motor Coil (A2)
18 Stepper Motor Coil (B2)
19 Volume Airflow reset sig
20 Fan Motor relay (Hi)
21 Fan Motor relay (lo)
22 AC relay
23 Ignition power transistor unit B
24 NONE
25 Power Supply
26 GND

31 Fuel Pump relay 2
32 Turbo wastegate solenoid
33 NONE
34 O2 Sensor Heater
35 O2 Sensor Heater
36 CE/malfunction indicator lamp
37 Power steering pressure switch
38 MFI Relay (power supply)
39 Turbo meter
40 Fuel Pressure Solenoid
41 NONE
42 O2 Sensor Heater
43 O2 Sensor Heater
44 Anti lock braking signal (According to manual, NO PIN on my 96)
45 AC Switch 1
46 NONE

51 Engine Ignition signal
52 Ignition timing adjustment
53 NONE
54 NONE
55 NONE
56
57 NONE
58 Electric Load Switch
59 AC Switch 2
60 NONE
61 Muffler mode changeover switch (According to manual, NO PIN on my car)
62

71 Ignition Switch - ST
72 Intake Air Temp sensor
73 Heated O2 sensor (rear)
74 Manifold diff press sensor
75 Heated O2 sensor (front)
76 Heated O2 sensor (front)
77 NONE
78
79 Heated O2 sensor (rear)
80 Back up Power Supply
81 Sensor Impressed Voltage
82 Ignition Switch: IG
83 Water Temp Sensor
84 Throttle pos sensor
85 Barometric Pressure sensor
86 Vehicle Speed sensor
87 Closed throttle pos switch
88 Camshaft pos sensor
89 Crankshaft pos sensor
90 Volume Airflow Sensor
91 GND
92 GND

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As you can see, its not a total 1 for 1 swap. Heres the wiring changes made:

Valve open/close indication signal:
Route pin 7 to pin 35

Fuel Pressure solenoid:
Route pin 40 to pin 7

Electric Load Switch:
Route pin 58 to pin 24

Muffler Mode changeover switch:
Route pin 61 to pin 34

Turbo Meter:
Route pin 39 to pin 41

Engine Ignition Signal:
Route pin 51 to pin 58

Front O2's are the same
Rear O2's:
Route pin 73 to pin 60
Leave pin 79 at 79
(have not verified I can log these, probly cant)

For Pin 73 EGRT circuit, i wired in a 10 ohm resistor to ground to prevent the CEL light since I have no EGR temp sensor. I will eventually use this to log a WB02.

GND O2 heater (cut the wires and grounded the wires coming into the harness, there is nothing connected to these pins on the ECU side):
34 - left bank front
35 - right bank front
42 - left bank rear
43 - right bank rear

I ended up just grounding all heater circuits, as this is what the wiring diagram showed for the '95 MFI circuit. In the 96 they were wired to the ECU for some reason.

Also, I had a boomslang harness I used for installing a SAFCII (which I did after the ECU). I cut the wires on this harness to save from having to screw up my stock wiring harness and it worked out quite nicely.
 

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Awesome avatar eh?
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So you are actually using the ecu out of a 95VR4? So when I go to do my TT conversion I should pick up the 117$ cable, evoscan, and vr4 ecu? Why does everybody else seem to go with first gen TT ecus? would the evoscan work on my NA ecu?

Good information BTW!

Thanks!
 

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Discussion Starter · #3 ·
The cable is totally your choice. You can splice into the wires of the factory harness and swap them there, but I found it much much easier and cleaner to use the boomslang. Can do all the work on a bench before hand and then just plug it in. Swapping wires in car would suck.

As for the ECU, thats your choice again. Since you already have a 95, i would think going with a 95 tt ECU would be the simplest solution. I think ppl in the past may have gone with 1st gen ECU's so they could log, but now that Evoscan works with hybrids it may be the better option?

I would think Evoscan would work for your N/A. I know almost everyone with a 95 VR4 was having trouble logging and had to swap a pin on the diag connector (using a crossover cable) to get it to connect, but not sure if that is needed on the N/A. When I swapped in the hybrid ECU on my car I connected right away without needing a crossover.
 

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Awesome avatar eh?
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Awesome! Thanks for the advice, I'll give it a try on my ecu first.

Thanks!
 

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Discussion Starter · #6 ·
My first and main reason was so that I could log using the Mitsu setting on Evoscan. Also, i've removed my cats. Having a hybrid ECU does not throw a CEL for that, whereas my stock ECU did. And now I can also now do the EGR block off and not throw a code as well.
 

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Glad i found this . I was thinking of going the opposite direction...
 

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?Mark
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I have been running my 96 vr4 with a 95 TT ecu and its doing just fine, all my CEL's went away. Now once in a blue moon I get 1 cel for o2 sensor but thats because all the stock O2 sensors have been eliminated lol.
 

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I just bought 95 hybrid ecu for my 96 car I have boomslang harness so I could wire these. But is it necessary. My only mod is dual o2 simulators because i have no cats. I seriously want to log my car.
 

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?Mark
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U dont need boomslang unless u add a greddy ultimate emanage or something like that. You just change out the ECU's. All your CEL's will go away lol, good stuff. Dont even need O2 simulator. But leave it in as once in a while I got a o2 sensor cel as I had all my o2 sensors eliminated as I was tuning of wideband o2 sensor.
 

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Discussion Starter · #12 ·
I just bought 95 hybrid ecu for my 96 car I have boomslang harness so I could wire these. But is it necessary. My only mod is dual o2 simulators because i have no cats. I seriously want to log my car.
Others have done an ECU swap only without swapping any wires and have had no problems. I really don't know that is necessary but I had access to the manuals and so I did it anyway.
 

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Since all my emission related CEL´s will go away I could go ahead and do a vacuum reduction also ? I no longer need the egr or the stupid manifold air pressure sensor on top of the plenum . I have polished plenum off 1994 vr4 but I cant fit it because it doesnt have the hole for the map sensor...

Thanks
 

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?Mark
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Yeah do the vac reduction, cleans up the engine bay nicely. I dunno about map sensor, its stil on mine.
 

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Discussion Starter · #16 ·
Since all my emission related CEL´s will go away I could go ahead and do a vacuum reduction also ? I no longer need the egr or the stupid manifold air pressure sensor on top of the plenum . I have polished plenum off 1994 vr4 but I cant fit it because it doesnt have the hole for the map sensor...

Thanks
Yes, you can do vac redux, and EGR delete now as well. The other bonus of the 95 ECU is you can also log a wideband using the EGR input on the ECU i believe.
 

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I´m planning to do the vac reduction tomorrow.Should I do the resistor mod to keep the EGR CEL away or should I feed my AEM UEGO output to EGR input I think it should keep the EGR CEL away too right ?

Regards
Miika
 

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Discussion Starter · #19 ·
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