USDM IX ECU Pinout

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

PCB Pictures

Front, Back

Complete harness - 93-pin interface

Pins 1, 2, 9, 10, 24, 25, 46, 47, 58, 59, 67, 68, 76, 77, 89, 90, 99, and 100 are the "large" variety (so, 6 per plug, or 18 total pins are large), and the remainder (29, 22, and 24 pins for each plug, or 75 total) are the "small" type. The large pins have been colored in yellow in the diagrams below.

C-121 C-119 C-117
1 2 3 4 JAE 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 31 32 33 34 35
41 42 43 44 45 46 47
48 49 50 51 52 53 54 55 56 57 58 59
60 61 62 63 64 65 66 67 68
71 72 73 74 JAE 75 76 77
78 79 80 81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100


C-121 - 35-pin connector

1 2 3 4 JAE 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 31 32 33 34 35


Pin Description
1 Injector #1
2 Injector #4
3 Front O2 heater control
4
5
6 Exhaust gas recirculation solenoid relay control, ground
7
8 Alternator voltage regulator, ground
9 Injector #2
10
11 Ignition coil, cylinder #1 and #4
12 Ignition coil, cylinder #2 and #3
13
14 Idle stepping motor (A)
15 Idle stepping motor (B)
16 Evaporative purge solenoid relay control, ground
17
18 Cooling fan relay control, ground
19 AFS active filter (MAF signal filter?)
20 A/C compressor clutch relay control, ground
21 Fuel pump relay control, ground
22 Check-engine light control, ground
23
24 Injector #3
25
26 Rear O2 heater control
27
28 Idle stepping motor (C)
29 Idle stepping motor (C)
30 A/C condenser fan relay control, high
31 A/C condenser fan relay control, low
32 MIVEC valve control
33
34 General sensor ground
35 Evaporative ventilation solenoid relay control, ground


C-119 - 28-pin connector

41 42 43 44 45 46 47
48 49 50 51 52 53 54 55 56 57 58 59
60 61 62 63 64 65 66 67 68


Pin Description
41 Wastegate solenoid relay control, ground
42 Throttle position sensor power (+5V)
43 Crankshaft position sensor signal
44 Coolant temperature sensor signal
45 Engine speed (RPM)
46 Chassis ground
47 12V power (through MFI relay)
48 Fuel pressure solenoid control, ground
49 Sensor ground (O2, MAP, air temp, coolant, TPS)
50 Exhaust camshaft position sensor signal
51 MAF barometric pressure sensor signal
52 Alternator voltage regulator signal
53 Intake camshaft position sensor signal
54 Power steering pressure sensor signal
55 Fuel pump relay control, ground
56
57 MFI relay control, ground
58 Chassis ground
59 12V power (through MFI relay)
60 12V power (backup ECU power, wired directly from battery)
61 MAF sensor signal
62 Intake air temperature sensor signal
63
64 Aftermarket use: ADC 0F, typically used for map switching in TephraMod
65 Air conditioning control
66
67
68 Starter relay signal


C-117 - 30-pin connector

71 72 73 74 JAE 75 76 77
78 79 80 81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100


Pin Description
71 Front O2 sensor signal
72
73 Rear O2 sensor signal
74
75
76
77
78 Throttle position sensor signal
79
80 Vehicle speed sensor signal
81
82
83 Air conditioning control
84
85 Data link (OBD-II/MUT-III comms, pin 7 on OBD-II port, C-122)
86
87
88 Clutch pedal switch
89
90
91 Knock sensor signal
92 MAP sensor signal
93 Fuel tank pressure differential sensor signal
94
95 Fuel level sender sensor signal (gauge)
96 Fuel temperature sensor signal
97 Fuel level sender sensor signal (low-fuel light)
98 Engine immobilizer system
99 Ignition switch IG1 (power when ignition in position "ON" and "START")
100 Data link (flash signal, pin 26 on diagnostic port, C-121)