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These are the pinouts for the US Spec 2002 WRX Turbo ECU, as provided to me by a fellow NASIOC member, Jon Schmidt. An explantion of the wiring color schemes is given at the bottom of the page. The "Notes" section commentary on the "SA" and "SB" in the chart is by another fine individual, Steve Carter. Any questions or comments I would be happy to try and answer.

ECU Connector Diagram



ECU Pinout Chart
2002 WRX Engine Control Module (ECM) I/O Signals
Content Pin Wire
Color
Signal (V) Note
Ignition SW ON
(Engine OFF)
Engine ON (Idling)
Crankshaft
position
sensor
Signal (+) B2 W 0 –7 — +7 Sensor output waveform
Signal (–) B11 G 0 0
Shield B21 SB 0 0
Camshaft
position
sensor
Signal (+) B1 R 0 –7 — +7 Sensor output waveform
Signal (–) B10 B 0 0
Shield B21 SB 0 0
Throttle
position
sensor
Signal B7 Lg Fully closed: 0.2 — 1.0
Fully opened: 4.2 — 4.7
Power
supply
B9 Sb1 5 5
Ground
(sensor)
B19 RG 0 0
Rear
oxygen
sensor
Signal B17 W 0 0 — 0.9
Shield B26 SB 0 0
Ground
(sensor)
B19 RG 0 0
Heater C13 RW 0 — 1.0 0 — 1.0
Front oxygen
(A/F)
sensor
Sensor (+) D19 W 2.8 — 3.2 2.8 — 3.2 Positive voltage to
sensor's (+) terminal
Sensor (–) D29 B 2.4 — 2.7 2.4 — 2.7 Positive voltage to
sensor's (–) terminal
Shield D18 SB 0 0
Heater 1 D4 W 0 — 1.0 0 — 1.0
Heater 2 D5 W 0 — 1.0 0 — 1.0
Engine
Coolant
temp.
sensor
Signal B18 BY 1.0 — 1.4 1.0 — 1.4 After engine warmup
Ground
(sensor)
B19 RG 0 0
Vehicle speed signal A1 GY 0 or 5 0 or 5 Four 5V pulses for each front
differential revolution. 2,548
pulses per minute is 60 km/h.
Mass air
flow (MAF)
sensor
Signal E13 PL 0.3 — 4.5
Shield E8 SB 0 0
Ground E7 BG 0 0
Intake air temperature
sensor signal
B27 Br
Exhaust
gas tem-
perature
sensor
Signal B16 WB
Ground
(sensor)
B19 RG 0 0
Tumble
generator
valve
position
sensor
RH
Signal B23 BrR Fully closed: 0.2 — 1.0
Fully opened: 4.2 — 4.7
Power
supply
B9 Sb1 5 5
Ground
(sensor)
B19 RG 0 0
Tumble
generator
valve
position
sensor
LH
Signal B13 BrY Fully closed: 0.2 — 1.0
Fully opened: 4.2 — 4.7
Power
supply
B9 Sb1 5 5
Ground
(sensor)
B19 RG 0 0
Tumble generator valve
RH (open)
E4 LG 0 or 5 0 or 5
Tumble generator valve
RH (close)
E5 YG 0 or 5 0 or 5
Tumble generator valve
LH (open)
E11 L 0 or 5 0 or 5
Tumble generator valve
LH (close)
E10 LY 0 or 5 0 or 5
Wastegate control
solenoid valve
D24 BW 10 — 13 13 — 14
Starter switch A16 Y 0 0 Cranking: 8 — 14
A/C switch A2 LY ON: 10 — 13
OFF: 0
ON: 13 — 14
OFF: 0
Ignition switch A5 GR 10 — 13 13 — 14
Neutral position switch A8 WB ON: 12±0.5
OFF: 0
Switch is ON when gear is in
neutral position.
Test mode connector A14 Or 5 5 When connected: 0
Knock
sensor
Signal B4 W 2.8 2.8
Shield B22 SB 0 0
Back-up power supply D10 BR 10 — 13 13 — 14 Ignition switch OFF: 10 — 13
Control unit
power supply
D2 YL 10 — 13 13 — 14
D3 YL 10 — 13 13 — 14
Sensor power supply B9 Sb1 5 5
Line end check 1 A10 RW 0 0
Ignition
control
Coil #1 C24 Y 0 13 — 14 Waveform
Coil #2 C23 YB 0 13 — 14 Waveform
Coil #3 C22 YR 0 13 — 14 Waveform
Coil #4 C21 YG 0 13 — 14 Waveform
Fuel
injector
control
#1 D1 P 10 — 13 1 — 14 Waveform
#2 C6 PL 10 — 13 1 — 14 Waveform
#3 C5 PB 10 — 13 1 — 14 Waveform
#4 C4 PG 10 — 13 1 — 14 Waveform
Idle air
control
solenoid
valve
Signal C10 R 0 or 13 — 14 0 or 13 — 14 Waveform
Fuel pump
controller
Signal 1 A13 LgR
Signal 2 C15 VW
A/C relay control D27 Br ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
Radiator fan relay 1
control
D17 RL ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
Radiator fan relay 2
control
D28 GR ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
Malfunction indicator
lamp (Check Engine)
D15 RW Light "ON": 1, or less
Light "OFF": 10 — 14
Engine speed (RPM) C9 G Waveform
Purge control solenoid
valve
D16 WL ON: 1, or less
OFF: 10 — 13
ON: 1, or less
OFF: 13 — 14
Torque control 1 signal A19 RY 5 5
Torque control 2 signal A18 PG 5 5
Torque control cut
signal
C14 YR 8 8
Fuel temperature
sensor
B6 LB 2.5 — 3.8 2.5 — 3.8 Ambient temperature: 25C
(75F)
Fuel tank
pressure
sensor
Signal B15 GOr 2.3 — 2.7 2.3 — 2.7 The value obtained after the
fuel filler cap was removed
once and recapped.
Ground
(sensor)
A19 RY 0 0
Fuel tank pressure
control solenoid valve
D22 LgB ON: 1, or less
OFF: 10 — 13
ON: 1, or less
OFF: 13 — 14
Drain valve D11 BrY ON: 1, or less
OFF: 10 — 13
ON: 1, or less
OFF: 13 — 14
AT diagnosis input
signal
B20 BrR Less than 1 or
More than 4
Less than 1 or
More than 4
Waveform
AT load signal B28 GW 4.3 — 4.4 0.9 — 1.4
Intake
manifold
air pressure
(MAP)
sensor
Signal B8 YB 1.7 — 2.4 1.1 — 1.6
Power
supply
B9 Sb1 5 5
Ground
(sensor)
B19 RG 0 0
Fuel level sensor B25 BrW 0.12 — 4.75 0.12 — 4.75
Small light switch A17 BW ON: 0
OFF: 10 — 13
ON: 0
OFF: 13 — 14
Blower fan switch A9 GR ON: 0
OFF: 10 — 13
ON: 0
OFF: 13 — 14
Rear defogger switch A3 L ON: 0
OFF: 10 — 13
ON: 0
OFF: 13 — 14
Power steering oil
pressure switch
B24 OrB 10 — 13 ON: 0
OFF: 13 — 14
SSM/GST
communications line
A21 LgB Less than 1 or
More than 4
Less than 1 or
More than 4
Ground (sensors) B19 RB 0 0
Ground (injectors) C8 BY 0 0
Ground (coils) C18 B 0 0
Ground (power supply) C17 BW 0 0
A22 BW 0 0
Ground (control systems) A7 BR 0 0
A15 BR 0 0
Wire Insulation Color Guide

Code Color
L Blue
B Black
Y Yellow
G Green
R Red
W White
Br Brown
Lg Light green
Gr Gray
P Pink
Or Orange
Lb Light blue
V Violet
SA Shielded
conductor
SB Shielding
braid

If two colors are given, then the first is the base color
and the second is the color of a stripe. Color codes are
case sensitive. For example, the color code "Lg"
indicates a light green wire, but the color code "LG"
means a blue wire with a green stripe.

Note:

1 Pin B9 supplies 5V power to several sensors. The
Wiring System manual gives its wire color code as "Sb"
which isn't a defined wire color code.

Connector Pin Guide

Connector Pin Diagrams


Standard Disclaimer: Modification of your car involves risks and may void your warranty. I can not be held responsible for the modifications you consciously decide to undertake nor for the results of doing so.



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