96-99 Legacy 2.5L DOHC ECU Discussion

[bubba2533]

I have a ECU and wire pigtail from a Legacy. Not sure exactly what year but in the range of 96-99 and it has the 2.5L DOHC engine. This is very similar to the 98rs ECU (I won't say identical because I don't know if that is entirely true.) I found the FSM PDF from a simple google search, but I have a few wires that are not accounted for.

I am looking to do a little research for SubySMART.com website and would like to see if anyone over here has any information or ideas. If you don't know what subySMART.com is go check it out.

There are 3 wires that do not have any identification in the wire diagram. They are PIN's 91-93.
(The 3 Wires that I did not know are connected to the OBD2 Port)
I would like to find out what these individual wires are used for and what they are called.

Also If anyone can tell me the wire color of this pin:
80 - AT Diagnostic Input Signal (Not On Manual Car)

Here is everything that is on the ECU cover.
VVVVVVVVVVVVVV
From top to bottom
DU7 83
83
22611 AD68B
JA 18000 DU7 9305
^^^^^^^^^^^^

Here is a PINOUT of the ECU with description of the wire and wire color
VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
PIN #_______Description______Wire Color
1 - Control Unit Power Supply__[Yellow/Blue Stripe]
2 - Control Unit Power Supply__ [Yellow/Blue Stripe]
3 - Knock Sensor Signal __[White/Silver Band]
4 - Fuel Tank Pressure Sensor Signal__ [Yellow/Blue Stripe/Silver Band]
5 - MAF Signal__ [White/Silver Band]
6 - TPS Signal __[White/Black Stripe/Silver Band]
7 - Camshaft Position Sensor Signal (+) __[Dark Green/Silver Band]
8 - Crankshaft Position Sensor Signal (+) __[White/Silver Band]
9 - Empty
10 - Fuel Tank Pressure Control Solenoid Valve __[light Green/Silver Stripe/Silver Band]
11 - Empty
12 - Empty
13 - Idle Air Control Solenoid Valve (Closed End) __[White/Yellow Stripe/Silver Band]
14 - Idle Air Control Solenoid Valve (Open End) __[Black/Silver Band]
15 - Pressure Sources Switching Solenoid Valve __[Yellow/White Stripe/Double Silver Band]
16 - Fuel Injector #4 __[Blue/Black Stripe/Double Silver Band]
17 - GND (Control Systems) __[Black/Red Stripe/Silver Band]
18 - GND (Control Systems) __[Black/Red Stripe/Silver Band]
19 - GND (Power Supply) __[Black/White Stripe/Silver Band]
20 - GND (Sensors) __[Red/Yellow Stripe/Silver Band]
21 - Fuel Tank Pressure Sensor Power Supply __[Red/Silver Stripe]
22 - Engine Coolant Tempurature Sensor __[Black/Yellow Stripe/Silver Band]
23 - Front Oxygen Sensor Signal __[Black/Silver Band]
24 - Rear Oxygen Sensor Signal __[Black/Silver Band]
25 - Fuel Tempurature Sensor __[Red/Blue Stripe/Silver Band]
26 - Atmospheric Pressure Sensor __[Dark Green/Silver Band]
27 - Fuel Level sensor __[Brown/White Stripe/Silver Band]
28 - Camshaft Position Sensor Signal (-) __[Red/Silver Band]
29 - Crankshaft Position Sensor Signal (-) __[Black/Silver Band]
30 - Empty
31 - A/C Relay Control __[Blue/Orange Stripe/Double Silver Band]
32 - Fuel Pump Relay Control __[Purple/Double Silver Band]
33 - Empty
34 - Empty
35 - Vent Control Solenoid Valve __[Brown/Yellow Stripe/Silver Band]
36 - Empty
37 - Rear Oxygen Sensor Heater Signal __[White/Blue Stripe/Double Silver Band]
38 - Front Oxygen Sensor Heater Signal __[White/Double Silver Band]
39 - Back Up Power Supply __[Red/Double Silver Band]
40 - Ignition Control #3 / #4 __[Yellow/Purple Stripe/Silver Band]
41 - Ignition Control #1 / #2 __[Yellow/Blue Stripe/Silver Band]
42 - GND (Oxygen Sensor Heater) __[Black/White Stripe/Silver Band]
43 - Empty
44 - Fuel Injector #3 __[Blue/Red Stripe/Double Silver Band]
45 - Empty
46 - GND (Power Supply) __[Black/White Stripe/Silver Band]
47 - Empty
48 - Empty
49 - Empty
50 - Empty
51 - Empty
52 - Empty
53 - GND (Mass Air Flow Sensor) __[Pink/Silver Band]
54 - Shield __[Gray/Silver Stripe]
55 - Empty
56 - Shield __[Black/Green Stripe/Silver Band]
57 - Shield __[Gray/Blue Stripe/Silver Band]
58 - Malfunction Indicator Lamp __[Red/Green Stripe/Double Silver Band]
59 - Empty
60 - A/C Switch __[Brown/Yellow Stripe/Double Silver Band]
61 - Empty
62 - Empty
63 - Self-Shutoff Control __[light Green/Silver Band]
64 - Engine Speed Output __[Black/Blue Stripe/Silver Band]
65 - Empty
66 - Empty
67 - Empty
68 - Empty
69 - GND (Injectors) __[Black/Yellow Stripe/Silver Band]
70 - Fuel Injector #2 __[light Green/Double Silver Band]
71 - Egr Solenoid Valve __[Black/Pink Stripe/Double Silver Band]
72 - Purge Control Solenoid Valve __[White/Blue Stripe/Double Silver Band]
73 - Radiator Fan Relay 2 Control __[Dark Green/Red Stripe/Double Silver Band]
74 - Radiator Fan Relay 1 Control __[Red/Blue Stripe/Double Silver Band]
75 - Empty
76 - Empty
77 - Empty
78 - Empty
79 - Empty
80 - AT Diagnostic Input Signal (Not On Manual Car) __[Do Not Know]
81 - AT/MT Identification __[Black/Red Stripe/Silver Band]
82 - Neutral Position Switch __[light Green/Black Stripe/Silver Band]
83 - Vehicle Speed Sensor 2 __[Dark Green/Black Stripe/Silver Band]
84 - Test Mode Conector __[Blue/Silver Band]
85 - Ignition Switch __[Yellow/Silver Band]
86 - Starter Switch __[Red/Yellow Stripe/Double Silver Band]
87 - Empty
88 - Empty
89 - Empty
90 - Empty
91 - OBD2 Plug Wire __[light Green/Red Stripe/Silver Band]
92 - OBD2 Plug Wire __[Dark Green/White Stripe/Silver Band]
93 - OBD2 Plug Wire __[Orange/White Stripe/Silver Band]
94 - GND (Ignition Systems) __[Black/Double Silver Band]
95 - GND (Injectors) __[Black/Yellow Stripe/Silver Band]
96 - Fuel Injector #1 __[Brown/Double Silver Band]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

If you have any information please let me know.

Thanks,
Branden

[elijah]

Here is a PINOUT of the ECU with description of the wire and wire color
VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
PIN #_______Description______Wire Color
1 - Control Unit Power Supply__[Yellow/Blue Stripe]
2 - Control Unit Power Supply__ [Yellow/Blue Stripe]
3 - Knock Sensor Signal __[White/Silver Band]
4 - Fuel Tank Pressure Sensor Signal__ [Yellow/Blue Stripe/Silver Band]
5 - MAF Signal__ [White/Silver Band]
6 - TPS Signal __[White/Black Stripe/Silver Band]
7 - Camshaft Position Sensor Signal (+) __[Dark Green/Silver Band]
8 - Crank Position Sensor (http://www.car-stuff.com/crankpositionsensor.htm) Signal (+) __[White/Silver Band]
9 - Empty
10 - Fuel Tank Pressure Control Solenoid Valve __[light Green/Silver Stripe/Silver Band]
11 - Empty
12 - Empty
13 - Idle Air Control Solenoid Valve (Closed End) __[White/Yellow Stripe/Silver Band]
14 - Idle Air Control Solenoid Valve (Open End) __[Black/Silver Band]
15 - Pressure Sources Switching Solenoid Valve __[Yellow/White Stripe/Double Silver Band]
16 - Fuel Injector #4 __[Blue/Black Stripe/Double Silver Band]
17 - GND (Control Systems) __[Black/Red Stripe/Silver Band]
18 - GND (Control Systems) __[Black/Red Stripe/Silver Band]
19 - GND (Power Supply) __[Black/White Stripe/Silver Band]
20 - GND (Sensors) __[Red/Yellow Stripe/Silver Band]
21 - Fuel Tank Pressure Sensor Power Supply __[Red/Silver Stripe]
22 - Engine Coolant Tempurature Sensor __[Black/Yellow Stripe/Silver Band]
23 - Front Oxygen Sensor Signal __[Black/Silver Band]
24 - Rear Oxygen Sensor Signal __[Black/Silver Band]
25 - Fuel Tempurature Sensor __[Red/Blue Stripe/Silver Band]
26 - Atmospheric Pressure Sensor __[Dark Green/Silver Band]
27 - Fuel Level sensor __[Brown/White Stripe/Silver Band]
28 - Camshaft Position Sensor Signal (-) __[Red/Silver Band]
29 - Crankshaft Position Sensor Signal (-) __[Black/Silver Band]
30 - Empty
31 - A/C Relay Control __[Blue/Orange Stripe/Double Silver Band]
32 - Fuel Pump Relay Control __[Purple/Double Silver Band]
33 - Empty
34 - Empty
35 - Vent Control Solenoid Valve __[Brown/Yellow Stripe/Silver Band]
36 - Empty
37 - Rear Oxygen Sensor Heater Signal __[White/Blue Stripe/Double Silver Band]
38 - Front Oxygen Sensor Heater Signal __[White/Double Silver Band]
39 - Back Up Power Supply __[Red/Double Silver Band]
40 - Ignition Control #3 / #4 __[Yellow/Purple Stripe/Silver Band]
41 - Ignition Control #1 / #2 __[Yellow/Blue Stripe/Silver Band]
42 - GND (Oxygen Sensor Heater) __[Black/White Stripe/Silver Band]
43 - Empty
44 - Fuel Injector #3 __[Blue/Red Stripe/Double Silver Band]
45 - Empty
46 - GND (Power Supply) __[Black/White Stripe/Silver Band]
47 - Empty
48 - Empty
49 - Empty
50 - Empty
51 - Empty
52 - Empty
53 - GND (Mass Air Flow Sensor) __[Pink/Silver Band]
54 - Shield __[Gray/Silver Stripe]
55 - Empty
56 - Shield __[Black/Green Stripe/Silver Band]
57 - Shield __[Gray/Blue Stripe/Silver Band]
58 - Malfunction Indicator Lamp __[Red/Green Stripe/Double Silver Band]
59 - Empty
60 - A/C Switch __[Brown/Yellow Stripe/Double Silver Band]
61 - Empty
62 - Empty
63 - Self-Shutoff Control __[light Green/Silver Band]
64 - Engine Speed Output __[Black/Blue Stripe/Silver Band]
65 - Empty
66 - Empty
67 - Empty
68 - Empty
69 - GND (Injectors) __[Black/Yellow Stripe/Silver Band]
70 - Fuel Injector #2 __[light Green/Double Silver Band]
71 - Egr Solenoid Valve __[Black/Pink Stripe/Double Silver Band]
72 - Purge Control Solenoid Valve __[White/Blue Stripe/Double Silver Band]
73 - Radiator Fan Relay 2 Control __[Dark Green/Red Stripe/Double Silver Band]
74 - Radiator Fan Relay 1 Control __[Red/Blue Stripe/Double Silver Band]
75 - Empty
76 - Empty
77 - Empty
78 - Empty
79 - Empty
80 - AT Diagnostic Input Signal (Not On Manual Car) __[Do Not Know]
81 - AT/MT Identification __[Black/Red Stripe/Silver Band]
82 - Neutral Position Switch __[light Green/Black Stripe/Silver Band]
83 - Vehicle Speed Sensor 2 __[Dark Green/Black Stripe/Silver Band]
84 - Test Mode Conector __[Blue/Silver Band]
85 - Ignition Switch __[Yellow/Silver Band]
86 - Starter Switch __[Red/Yellow Stripe/Double Silver Band]
87 - Empty
88 - Empty
89 - Empty
90 - Empty
91 - OBD2 Plug Wire __[light Green/Red Stripe/Silver Band]
92 - OBD2 Plug Wire __[Dark Green/White Stripe/Silver Band]
93 - OBD2 Plug Wire __[Orange/White Stripe/Silver Band]
94 - GND (Ignition Systems) __[Black/Double Silver Band]
95 - GND (Injectors) __[Black/Yellow Stripe/Silver Band]
96 - Fuel Injector #1 __[Brown/Double Silver Band]

bump!

Hey there! The thread is quite old but I'm kinda curious if you were able to pinpoint the cause why some of the wires don't have identification. One of my friend is also experiencing this kind of issue and were kinda confused how to resolve it. Hoping you could share us what you did to fix this thing.

[emsalex]

i have i wireless obd read that is sending a blue tooth signal to my phone i have a 87 2.5 about the only signle it sends is motor load(in %) and coolant temp. if there is anything i can try and bring up from the obdII port let me know(pm's or here) ill try and track it down, also with they amount of info im getting form the port i am thinking about selling the blue tooth obdII reader,(Do not hijack this thread pm if your interested)

this is interesting.

[emsalex]

also(sorry for 2 posts) subysmart . com is not a real cit.