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1986 to 1988 ECU conversion


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#1 Chad

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Posted 15 May 2002 - 12:37 PM

86 TSI:  “A” connector

1: IGN –
2: AFS
3: n/c
4: GND (AFS)
5: Intake temp
6: Coolant temp
7: Idle SW
8: Motor Position SW
9: Pressure to gage
10: +5 volt power
11: O2 sensor
12: Ignitor signal
13: n/c
14: n/c
15: TPS
16: n/c
17: Intake temp (OVCP)
18: n/c
19: speed (coil)
20: n/c
21: Diag. Output
22: control relay (fuel pump)
23: secondary air (for catalyst)
24: pressure solenoid

86 TSI “B” connector:

1: +12V
2: GND
3: GND
4: EGR
5: IGN (cranking)
6: AC relay
7: +12V
8: Inhibitor
9: ISC + (out)
10: Injector # 1
11: ISC – (in)
12: Injector # 2
13: +12V backup




88 TSI “A” connector:

-            1: IGN –
-            2: AFS
from A 8      3: Motor position SW
-            4: GND
-            5: Intake temp
-            6: Coolant temp
-            7: Idle SW
n/c            8: n/c      
n/c            9: n/c
-            10: +5 volt power
-            11: O2 sensor
from B 11      12: ISC – (in)
n/c            13: Ignitor advance
n/c            14: Sensor +5 backup
-            15: TPS
new to AFS >      16: Barometric sensor
n/c            17: n/c
n/c            18: n/c
-            19: Speed (coil)
n/c            20: secondary air (catalyst)
-            21: Diag. Output
-            22: control relay (fuel pump)
from B 9      23: ISC + (out)
n/c            24: AC relay

88 TSI “B” connector:

-            1: +12 V
-            2: GND
-            3: GND
-            4: EGR
-            5: IGN (cranking)
-            6: AC switch
-            7: +12 V
-            8: inhibitor
n/c            9: Boost gage
-            10: Injector 1 (primary)
from A 12      11: Ignitor signal
-            12: injector 2 (secondary)
-            13: +12 V backup

since a different MAS is needed to convert, you may as well step up to a 1-G DSM MAS, they are cheaper and work quite a lot better.


86 AFS:            DSM  AFS:

green/red            green/orange
red                  green/red
black                  green/black
white/black            green/blue
new > A 16            green/yellow
new > +12 Switched      red
n/c                  green/white      


Notes:

>”n/c”  means “no connection”

>”-“  means “stays the same”

>”From A 8”  means “remove from stock 86 connector and relocate to the 88 pin number”

>On two pins, you will have to cut the wires and solder on the pin from the “A” or “B” connector, these connectors use different pins, you will have the pins you need when you start to move them.  Some move from “A” to “B”, and some from “B” to “A”.  Some leads may be left over, these are pins not used (if you eliminate the secondary air and the stock boost gage)

This conversion also requires an 87/89 ISC assembly.  The new ISC requires a +5 V supply and a ground for the new functions,  because the MPS converted from a simple switch to a potentiometer, you need 2 additional wires.  However, the mitsu engineers decided to add 3 wires instead, and the 3rd is un-used at the ISC end, it is the blue/yellow and literlay has no physical connection at the ISC end, either in the ISC nor in the connector itself so don't bother with it.  

looking at the diagrams, it shared the common ECU ground in 87/89's, so ground it anywhere.  same for the +5 V, it connects to a common supply, so just find 5V at the ECU or at some other component like the TPS which is just inches away.


So here's what you need to do:

looking at the 87 ISC, you have a connector that has black/red, black/green and black/blue, this is the motor and idle SW.  It connects as follows to the 86 harness:

87 ISC motor :

87 ISC black/red       to   87 harness yellow/black  (splice here) to 86 harness  green/white

87 ISC black/green    to   87 harness yellow/lbue  (splice here)  to  86 harness black/yellow

87 ISC black/blue      to   87 harness yellow/red    (splice here)  to 86 harness yellow/red

now you have the 4 pin connector with green/red, blue/red, black, and blue/yellow, this is the new MPS circuit and connects as follows:

87 MPS:

87 ISC red     to   87 harness green/red    (splice here)   to  new +5 volts  
87 ISC green  to  87 harness blue/red      (splice here)   to  86 harness green/black
87 ISC black  to   87 harness black          (splice here)   to  new ground

87 ISC red jumper  to   87 harness blue/yellow   to   N/C  <  don't mess with this one

leave the pins at the ECU where they are, they are correct, you simply need to add the 87 ISC, splice the 87 harness to the 86 harness where is says "splice here", and wire in the +5 and the ground





#2 Ray_R

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Posted 15 May 2002 - 06:44 PM

chad if  im not converting my 86 to 89 ecu how do i run those last 2 wires for the DSM mas.
sorry for questions.
thanks

#3 Chad

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Posted 16 May 2002 - 12:23 PM

you just need 2 wires of 14-16 gage and run them from the ECU "B" connector to the MAS, you'l have to poke through the fire wall for that, but there are several places to go though.  If you look on the 86 wiring chart, you can find the nessesary +12 v and ground to use for this DSM MAS.

#4 Ray_R

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Posted 16 May 2002 - 06:04 PM

ok got it now.
thanks for all the help!

#5 Ramquest

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Posted 16 May 2002 - 08:44 PM

If I change ecu and injectors(I assume)with 1st dsm mas, will ISC on my 86 work ok?
What kind of perf gains should I get(did you get)?Will I have to reset anything or
will it just work?

#6 Guest_Paul87Quest_*

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Posted 17 May 2002 - 01:48 PM

No it will not work as you need the 87-89 style ISC assembly that has a motor position sensor (the bump on the isc assembly). The ISC should be replaced with the later style to remain trouble free....

#7 Ramquest

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Posted 17 May 2002 - 10:31 PM

Do I have to change my harness connection to isc or will 86 wiring work?
What gains should I expect?

#8 Chad

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Posted 21 May 2002 - 08:11 PM

You do have to change the ISC, I updated my instructions in the first posing.  After discussing this with Steve F, we figures it out.  I never noticed the problem on mine since it idles just fine without the ISC  ???

#9 Ramquest

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Posted 22 May 2002 - 08:32 AM

What changes did you notice after changing?What performance did you notice?

#10 constar

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Posted 29 January 2003 - 09:37 PM

I have a ECU out of a 88 Conquest  with a automatic. Can I use this one for my conversion? Thanks

#11 StarWoes

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Posted 05 February 2003 - 02:22 PM

I take it converting to the '89 ECU should be about the same as the instructions for the 88 ECU or?  I have the '86 Star, an 86 Shop Manual and an '89 ECU but not the '89 manual so a bit difficult for me to cross reference. :-/ :-/  If have the information available, please add to this post.  Thanks....

#12 mikec

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Posted 09 February 2003 - 12:50 AM

88 and 89 ECUs are virtually identical.  You can replace one with the other with absolutely no wiring changes.  So Chad's instructions can be used to swap in an 89 ECU as well.  In fact, the 87 has the same ECU pinout so you could even swap in an 87 ECU although there'd be almost no gain at all - especially for the amount of work involved.

Also, in 1987, Mitsu quit using different ECUs for automatic tranny cars vs. 5-speed cars.  The ECU is identical regardless of tranny type.  One of the wiring harness wires tells the ECU what kind of transmission is in the car and the ECU makes the appropriate adjustments.  Thus, when doing Chad's conversion, you can use an 88 or 89 ECU from either a 5-speed or automatic equipped donor car.

mike c.

#13 StarWoes

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Posted 10 February 2003 - 10:24 AM

GRRRR8888 ;D ;D ;D you da man Mike C

#14 quoris

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Posted 20 March 2003 - 10:01 PM

all so the isc  moter is not wired correctly. i found this out the hard way when i hooked it up and the moter went to 5,000 rpm untill i shut the moter off.  just to let you know. the yellow/blue is the + for the isc motor.the yellow/black is the - for the isc motor. so the yellow/blue needs to go the the green/white, and the yellow/black goes to the black/yellow. i compaired the 86 to the 88 wiring diagram and found this out.

#15 Red86TSI

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Posted 23 July 2003 - 09:10 AM

What hard parts are required for this conversion?  I know I'll need a 88-89 ecu and 87-89 ISC, but what about injectors?  Could I use injectors from a 87-89?

Someone please fill me in.

Thanks,
Gabe

#16 SidewaySStarion

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Posted 01 January 2005 - 06:46 PM

QUOTE
What hard parts are required for this conversion?  I know I'll need a 88-89 ecu and 87-89 ISC, but what about injectors?  Could I use injectors from a 87-89?

Someone please fill me in.

Thanks,
Gabe


so would this work on a 85.5 esi? if it would id like to do it? and do i need new injectors?
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#17 Coy

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Posted 05 June 2005 - 01:08 PM

QUOTE (Red86TSI)
What hard parts are required for this conversion?  I know I'll need a 88-89 ecu and 87-89 ISC, but what about injectors?  Could I use injectors from a 87-89?

Someone please fill me in.

Thanks,
Gabe


waiting for reply to this as well.

#18 starquestPilot

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Posted 06 June 2005 - 12:53 PM

Me too...

Mike
'84 Conquest (black w/gold/tan)
'85.5 Starion (grey/black)
'85.5 Starion (white/black)
'87 Starion LE auto (white/red)

#19 Chad

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Posted 25 October 2006 - 11:23 AM

FOR FUTURE REFRENCE:

the 87 is this: (I'VE NOW ADDED COLORS TO THE CHART) AND EDITED THE DECRIPTIONS FOR THE 87.

THESE ARE STRAIGHT OUT OF AN 87 MANUAL.

87 TSI “A” connector:

W 1: IGN – (coil)
WB 2: AFS
LR 3: Motor position SW
B 4: GND
GR 5: air Intake temp
YG 6: Coolant temp
YR 7: Idle SW
8: n/c
9: n/c
GR 10: +5 volt power
W 11: O2 sensor
YB 12: ISC – (in)
YB 13: Ignitor advance
LY 14: MPS GROUND backup
GW 15: TPS
BW 16: Barometric sensor
17: n/c
18: n/c
LgB 19: Speed (coil)
RG 20: secondary air (catalyst)
BR 21: Diag. Output
WR 22: control relay (fuel pump)
YL 23: ISC + (out)

87 TSI “B” connector:

R 1: IGN +12 V
B 2: GND
B 3: GND
RW 4: EGR
BY 5: IGN START(cranking)
BW 6: AC switch
R 7: IGN +12 V
BY 8: GROUND
YG 9: Boost gage
YB 10: Injector 1 (primary)
BR 11: Ignitor signal FOR INJECTOR TIMING
YL 12: injector 2 (secondary)
B 13: +12 V CONSTANT

#20 Tim_C.

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Posted 11 February 2009 - 11:04 AM

bump
'87TSi .510Roller Cam, JE Forged, TS Rings & plateau honed walls, lightened rods, race prepped crank, mains line honed, balanced, 17C, 3"EX, 2"HardPipes, AlFly, rrfpr, 88trans, 3.90's w/posi plate mods, polyBushings, STSprings, KYBStruts, Camber Plates, CustomAlternator
Traded for new set of tires for my wife's Buick: '87 TSI Gold that needs just about all steering and suspension parts replaced, injectors, a new transmission, clutch, and various electrical gremlins. New owner is a mechanic who is already driving it. I couldn't stand letting it sit any more!
'86 ESiR - OEM Roller Cam, Wiseco Forged 8:1 Pistons, Chad's equal length header, TEP T3/T4 turbo, ACT HD clutch, Fidanza Fly, custom 3" exhaust, 3 core oversized radiator, O-ringed block, AJUSA metal shim head gasket, Dawes Device boost controller
'85 Plymouth Conquest Auto , Wiseco 8:1, super light pins, shaved rods, hi-torque cam, 2.5 Exhaust
'84 Dodge Conquest Parts car
'83 Starion - Gutted stock exhaust with '87 TSi muffler, New engine with: BS Elim,forged Wisecos,balanced,Schneider274H,marnal w/oversized stainless valves
'83 Cannonball Run II Jackie Chan car, Basic ring and bearing job w/less than 6K original miles on body, steering, suspension, & rear end, Lightened stock fly, BS Elim, Walbro 255LPH FP, NEW Clearwater head with all new parts, intercooled, 14G turbo, 2750 car weight
'96 Mitsu Mirage w/rebuilt head. Gets 35+MPG.
'87 Dodge Ram50 4WD Rebuilt engine, fresh stock head, Weber carbed, BS elim. Runs great now!
'97 Buick Ultra (supercharged Park Avenue)




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