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.
Complete harness
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
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
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
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)
|