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Old 12-15-2010, 11:27 AM   #1
Scooby Specialist
Member#: 208052
Join Date: Apr 2009
Chapter/Region: MWSOC
Location: Southern Indiana
2004 SGM FXT-6speed

Default 97 WRX Wagon to 99 Forester ECU Pinout Help

Alright gonna see if i can get some help with this. I made these ECU pinout lists to see what pins I need to move where and some are not used (yellow) and some I don't know what they are (orange) and then I don't know why the sti gets intake air temp but the wrx dosn't (blue).

Should I go through all the trouble of running this with the wrx ecu or should I just get a piggyback and keep the forester ecu? Seems that keeping it would be easier but which way would be better?

If you can chime in with what should go where and what I can leave out I would appreciate it.

99 Forester

Pin Description
1 Fuel Tank Pressure Control Solenoid
2 Purge Control Solenoid
3 Radiator Fan
4 Injector #1
5 Idle Air Control Solenoid
6 Idle Air Control Solenoid
7 Engine Ground
8 Engine Ground
9 Combination Meter CPU
10 Drain Valve Fuel Tank
11 Malfunction Light Combination Meter
12 Radiator Fan
13 Injector #2
14 Injector #3
15 Injector #4
16 Fuel Pump Relay Coil
17 Coil of Air Conditioning Relay
19 Idle Air Control Solenoid
20 Idle Air Control Solenoid
21 Rear Oxygen Sensor
22 Front Oxygen Sensor (A/F)
23 Front Oxygen Sensor (A/F)
24 Air Assist Solenoid
25 Ignition Coil/ Ignitor
26 Ignition Coil/ Ignitor
27 Engine Ground
30 AT/ Combination Meter
31 AT
34 Engine Ground
35 Engine Ground

Pin Description
1 Left Crankshaft Position Sensor
2 Right Crankshaft Position Sensor
3 Data Link Connector/ Check Connector
4 AT
6 Engine Ground
7 Fuel Pump Relay Coil Power/ FB11-No.11 D
8 Left Crankshaft Position Sensor
9 Right Crankshaft Position Sensor
10 Crankshaft Position Sensor Shield
11 Check Connector/ Test Mode/ Data Link Connector
12 Check Connector/ Data Link Connector
13 Power Steering Oil Pressure Switch
14 Check Connector/ Diagnosis Connector/ Test Mode Connector
16 AT
17 AT
19 Main Relay Coil
20 Test Mode Connector
21 Reference to Rear Defogger
24 TCM/ Combination Meter
25 Engine Ground
26 Neutral Position Switch
27 Evaporator Thermoswitch
28 Reference to Starting System/ Inhibitor AT

Pin Description
1 Main Relay Contact 2 F
2 Main Relay Contact 2 F
3 Reference to Light System ( Tail & Illum)
4 Knock Sensor
5 Pressure Sensor/ Intake Temperature
6 Front Oxygen Sensor (A/F)
7 Front Oxygen Sensor (A/F)
9 Power MB-2 SBF-5
11 AT
12 Fuel Tank Pressure Sensor
13 Pressure Sensor/ Intake Temperature
14 Engine Coolant Temperature Sensor
15 TPS 5V
16 TPS 0V/ Sensor Ground Joint Connection
17 TPS Signal
18 Rear Oxygen Sensor
19 Front Oxygen Sensor (A/F)
20 Front Oxygen Sensor (A/F)
21 Engine Ground
22 Engine Ground
23 Front Oxygen Sensor (A/F)
24 Rear Oxygen Sensor
25 Shield Joint Connector
26 Fuel Temperature Sensor
27 Fuel Level Signal
29 Atmospheric Pressure Sensor
30 Coil Blower Motor/ AC Button/ Fan Switch
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Last edited by KOJAK-02-WRX; 12-15-2010 at 12:16 PM.
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Old 12-15-2010, 11:28 AM   #2
Scooby Specialist
Member#: 208052
Join Date: Apr 2009
Chapter/Region: MWSOC
Location: Southern Indiana
2004 SGM FXT-6speed


97 WRX (V3 EJ20K)

Pin Description
33 Left Crank Sensor
34 Shield Connection Bar
35 Right Crank Sensor
36 Air Flow Meter
37 Air Flow Meter Signal
38 O2 Sensor
39 Knock Sensor
40 Water Temp Sensor Signal
41 Test Mode Connector
42 Read Memory Connector
43 EGT Sensor
44 Engine Ground
45 Absolute Pressure Sensor
46 TPS Sensor Signal
48 TPS Sensor

111 Power/ Fuel Pump Relay Coil/ Ignition Coil
112 Ignition Relay Coil
113 Power from Ignition Relay Contact
114 Power from Ignition Relay Contact
115 Water Temp Sensor/ TPS Sensor Common
116 Engine Ground

Pin Description
1 Ignitor
2 Ignitor
3 Check Engine Light Combination Meter
4 Fuel Pump Relay Coil Control
5 Atmospheric Pressure Solenoid
8 Wastegate Solenoid
11 AC
12 EGT Warning Light Combination Meter
16 Intercooler Water Sprayer (Sti)

101 Injector #2
102 Injector #3
103 Injector #4
104 Injector #1
105 Engine Ground
106 Engine Ground
107 Idle Speed Control Valve
108 Idle Speed Control Valve
109 Constant Power
110 Engine Ground

Pin Description
17 Radiator Fan Circuit
18 AT Control Unit
20 AUTO AC Control Unit
21 AUTO AC Control Unit
22 Read Switch Combination Meter
23 Starter Motor
24 Intake Air Temperature Sensor (Sti)
25 Radiator Fan Circuit
26 CPC Solenoid
27 Tachometer Combination Meter
28 Intercooler Water Sprayer (Sti)
30 AT Control Unit
31 AC
32 Neutral Position Switch
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Old 12-15-2010, 11:08 PM   #3
NASIOC Supporter
Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Boise,Idaho,USA
The 93 W/EJ20K
Series 10 FRS


merge the harness

have you read this thread?

of if its too scary ship it off and have them merged ...
Jaxx is offline   Reply With Quote

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