USDM VIII ECU Pinout

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The USDM Evo VIII ECU uses a four-plug harness, with two rows of pins for each plug. The factory service manual refers to these plugs as C-121, C-119, C-117, and C-115.

For a picture of the ECU-side of the harness, see Road Race Engineering's EVO VIII pinout page.

Complete harness

Pins 1, 2, 3, 12, 13, 14, 15, 16, 25, 26, 71, 80, 81, 82, 91, and 92 (16 total) are "large"; the remaining (60) pins are "small". Large pins have been marked in the diagrams below with a yellow background color.

C-121 C-119 C-117 C-115
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26
31 32 33 34 35 36 37 38
39 40 41 42 43 44 45 46
51 52 53 54 55 56
57 58 59 60 61 62
71 72 73 74 75 76 77 78 79 80 81
82 83 84 85 86 87 88 89 90 91 92

C-121

1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26


Pin Description
1 Injector #1
2 Injector #3
3 Fuel pressure solenoid
4 Idle air control motor, coil A1
5 Idle air control motor, coil B1
6 Exhaust gas recirculation solenoid relay control, ground
7
8 A/C compressor clutch control, ground
9 Evaporative emission purge solenoid
10 Ignition coil, cylinder #1 and #4
11 Turbocharger wastegate solenoid
12 12V power (through MFI relay)
13 Chassis ground
14 Injector #2
15 Injector #4
16
17 Idle air control motor, coil A2
18 Idle air control motor, coil B2
19 Volume airflow sensor reset (MAF filter?)
20
21 A/C condenser fan control
22 Fuel pump relay
23 Ignition coil, cylinder #2 and #3
24 A/C control (?)
25 12V power (through MFI relay)
26 Chassis ground


C-119

31 32 33 34 35 36 37 38
39 40 41 42 43 44 45 46


Pin Description
31
32 A/C condenser fan relay (high)
33 Alternator voltage regulator, ground
34 A/C condenser fan relay (low)
35 Charge air cooler water spray fluid meter
36 Check-engine light
37 Power steering pressure sensor signal
38 MFI relay control, ground
39 Fuel pump relay control, ground
40 Sensor ground (IAT, cam position, fuel tank pressure, MDP, TPS)
41 Alternator voltage regulator signal
42 Aftermarket use: ADC 0F, typically used for map switching in TephraMod
43 Clutch pedal position switch
44 Charge air cooler water spray switch (auto control)
45 A/C control (?)
46 Fuel level sender signal (gauge)


C-117

51 52 53 54 55 56
57 58 59 60 61 62


Pin Description
51 Engine immobilizer system
52
53
54 Rear O2 sensor heater control
55 Evaporative emission ventilation solenoid
56
57 Charge air cooler water spray relay control
58 Engine speed (RPM)
59
60 Front O2 sensor heater control
61 Fuel tank differential pressure sensor signal
62 Data link (OBD-II/MUT-III comms, K-line, pin 7 on OBD-II port, C-14)

C-115

71 72 73 74 75 76 77 78 79 80 81
82 83 84 85 86 87 88 89 90 91 92


Pin Description
71 Starter relay signal
72 Intake air temperature sensor signal
73 MAP sensor signal
74 Fuel level sender signal (low-fuel light)
75 Rear O2 sensor signal
76 Front O2 sensor signal
77 Fuel temperature sensor signal
78 Knock sensor signal
79 Data link (flash signal, pin 26 on diagnostic port, C-15)
80 12V power (backup ECU power, wired directly from battery)
81 Throttle position sensor power (+5V)
82 Ignition switch IG1 (power when ignition in postion "ON" and "START")
83 Coolant temperature sensor signal
84 Throttle position sensor signal
85 MAF barometric pressure sensor signal
86 Vehicle speed sensor signal
87
88 Intake cam position sensor signal
89 Crankshaft position sensor signal
90 MAF sensor signal
91 Charge air cooler water spray switch (manual control)
92 Sensor ground (O2 heaters, coolant temp, tps signal, MAP, fuel tank pressure signal)