Aargh! What is this wire?

[HalfMoon]

My loom came marked up ready to install, but the label disappeared from one wire.... It's a G7 ecu:



I have a feeling it might have been labelled to do with the Fuel pump but I've checked the wiring diagrams that I have and it's not on them....!? It's the one marked with a white arrow on the bottom right.




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Project Thor - '71 Fastback with an EJ20T

[ElusiveStranger]

Year, model??

(Will hazard a guess it's the 12V to the main relay or fan control)
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'78 Bay, 2 litre 091 box, EJ20 NA & the ashtray's on the 'right' side.
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[sven]

Here you go!




And if you find the Japanese difficult, this is taken from the Nasioc forum. I believe you are looking for a "exhaust noise warning lamp"?.. See the translation below.
But I think it's more an "Intercooler Pump control" that's used for something else (see further below).

Ej207 verison 5/6

Input side??

117 *ECU Power?
121 *Ignition SW?
60 Sensor Power?
55 Airflow sensor ?
124 Airflow sensor ground?
65 02 Sensor?
50 Crank angle sensor?
63 Crank angle sensor ground?
51 Cam angle sensor?
70 *Water temp sensor?
72 Knock sensor?
66 Throttle sensor?
49 MAP sensor?
67 Intake temperature sensor?
48 Car speed sensor?
37 Air conditioner SW?
30 Starter SW?45 Neutral SW?
31 Power Steering Switch?
29 Torque Down 1?
36 Torque Down 2?41 Small light SW?38 Blower fan SW?43 Rear Defogger SW?40 Test mode connector?35 Reed (Lead?) memory connector?
7:23
Output side??
108 Injector #1?
107 Injector #2?
105 Injector #3?103 Injector #4?


1 Ignition signal 1,2?
8 Ignition signal 3,4?
10 ISC Valve 1?
3 ISC Valve 2?
9 ISC Valve 3?
2 ISC Valve 4?
25 Canister Purge Solenoid?
19 ?? pressure solenoid?
24 Atmosphere switch solenoid?
4 Radiator Relay 1

11 *Radiator relay 2?
17 Fuel Pump relay?
16 Air conditioning relay?
22 Check Engine Light?
34 Engine RPM?
45 Intake air amount?
33 Torque down ???
18 Alternator ???
10 Injector ground?
102 Power-type ground?
104 Ignition ground?119 ???
122 Sensor-type groundThis is F/G (so version 5/6)

Input side

117 ECU Power
121 Ignition SW
60 Sensor Power
55 Airflow sensor
124 Airflow sensor ground
65 02 Sensor
50 Crank angle sensor
63 Crank angle sensor ground
51 Cam angle sensor
70 Water temp sensor
72 Knock sensor
66 Throttle sensor
49 MAP sensor
67 Intake temperature sensor
48 Car speed sensor
37 Air conditioner SW
30 Starter SW
45 Neutral SW
31 Power Steering Switch
29 Torque Down 1
36 Torque Down 2
41 Small light SW
38 Blower fan SW
43 Rear Defogger SW
40 Test mode connector
35 Reed (Lead?) memory connector

7:23
Output side

108 Injector #1
107 Injector #2
105 Injector #3
103 Injector #4
1 Ignition signal 1,2
8 Ignition signal 3,4
10 ISC Valve 1
3 ISC Valve 2
9 ISC Valve 3
2 ISC Valve 4
25 Canister Purge Solenoid
19 ?? pressure solenoid
24 Atmosphere switch solenoid
4 Radiator Relay 1
7:23
11 Radiator relay 2
17 Fuel Pump relay
16 Air conditioning relay
22 Check Engine Light
34 Engine RPM
45 Intake air amount
33 Torque down ??
18 Alternator ??
10 Injector ground
102 Power-type ground
104 Ignition ground
119 ??
122 Sensor-type ground

_______________________________________

EJ20G

Input
16 Power Steering Switch
19 Idle switch
20 Knock sensor signal
21 Knock sensor body ground
22 Cam Sensor body ground
23 Cam sensor signal
30 Accelerator switch
31 Starter switch
32 Air conditioner switch
34 Crank angle sensor switch
33 Crank Angle sensor body ground
37 Throttle sensor signal
36 Throttle sensor ?? Voltage ground
38 Throttle sensor body ground
39 Ignition SW+
40 Car speed sensor
41 Neutral SW
45 Airflow sensor body ground
46 Airflow sensor signal
47 Airflow sensor power
55 Airflow sensor body ground
48 Water temp sensor
49 O2 sensor signal
57 O2 sensor body ground
50 Exhaust temp sensor
51 pressure sensor signal
52 pressure sensor power
53 pressure-type ground
7:34
output

1 ignition #1
2 ignition #2
3 ignition #3
4 ignition #4
113 ignition-type ground
7 Radiator fan relay 2
8 ? solenoid
9 Fuel pump relay
10 Air conditioner relay
12 Atmosphere Absolute pressure switch solenoid
13 Check engine lamp
15 radiator fan relay 1
25 engine rotation signal
111 ISC valve open
112 ISC valve close
101 injector #1
102 injector #2
103 injector #3
104 injector #4
134 exhaust noise warning lamp
105 injector-type body ground
106 injector-type body ground
121 ? body ground
122 ? body ground
________________________________________________

EJ20K

Input
113 ECU power
111 Ignition SW
37 Airflow sensor signal
36 Airflow sensor ground
38 O2 Sensor
33 crank angle sensor +
34 crank angle sensor ground
35 cam angle sensor
40 water temp sensor
39 knock sensor
48 throttle sensor power
46 throttle sensor signal
45 absolute pressure sensor
22 car speed sensor
43 exhaust noise sensor 1
31 Air conditioner SW
23 Starter SW
32 Neutral SW
115 sensor-type ground
105 injector ground
110 power type ground
116 ??
106 ignition ground
24 intake temperature sensor
28 intercooler spray auto SW
7:44
output

104 injector #1
101 injector #2
102 injector #3
103 injector #4
1 ignition signal 1,2
2 ignition signal 3,4
107 IDC valve open
108 IDC valve close
26 canister purge solenoid
8 ? pressure solenoid
5 atmosphere switch solenoid
17 radiator fan relay 1
25 radiator fan relay 2
4 fuel pump relay
11 aircon relay
3 check engine lamp
12 exhaust sound warning lamp
27 engine rotation signal
20 select monitor send
21 select monitor receive
41 test mode connector
42 reed (lead?) memory connector
30 AT ?
18 AT air amount



Check if something here can help you:
http://www.northursalia.com/modifications/misc/wiring/wiring.html

[HalfMoon]

[rjes]

The only diagrams I have for Legacy turbo's with water cooled intercoolers show only one intercooler pump control wire from the ECU, and it's not the one in your photo (b126:12). However, I do have a schematic (with no pin numbers or wire colours) which shows two intercooler control wires from the ECU. Maybe you have this version with two wires, as b126:12 is not connected to anything in any of my diagrams.

With both versions I believe the intercooler pump should run constantly at a low speed, then run at full speed when the ECU decides so.

Your ECU part number is used in EDM 1992 - 1994 Legacies. I guess it is probably not also used in Impreza's, but that's only a guess. Iy your engine has a water cooled intercooler it's fron a Legacy, if air to air, it's from an Impreza.
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Regards,

Richard,

R J Engineered Solutions
Quality Subaru Powered VW Components
www.rjes.com

[Kai]

Was curious to know if anybody had done much else on this subject or has any further thoughts.... I know its an old subject but......


A little while ago when I was having troubles with my ecu I went through the trouble shooting section of the Subaru manual.



This link is to the Impreza workshop manual,

http://www.cannell.co.uk/Subaru_Workshop_Manuals/1993-1996impreza.pdf



Page 404 states that

B43 no 12 should be showing +12 V with the ignition on.



I know that previously I have found the manual incorrect, but only by misprinted wrong pinouts numbers, this was further along the path into diagnosing my faulty ECU and I can't specifically recall the were this is in the trouble shooting guide.



Currently mine is as above and open circuit doing SFA.
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Think......

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[GeeJay]

I have exactly the same engine year and ECU reference, I'll check on mine tomorrow to see where the wire goes and what it does.
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VWPRO 204 - Sick Bubblegum.

[easy-does-it]

Checked mine ('92 legacy turbo) and i dont even have the wire in the ecu.
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'76 bay going superfly TDI