Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
100%
Stock ECU being replaced
GND
GND
MAIN-R-COIL+ Relay coil positive (ignition-switched +12V)
PROTEUS-Black35-21 Lowside 12
ECM power (J271 relay feed)
PROTEUS-Black35-7 Injector 7
PROTEUS-Black35-11 Lowside 14
PROTEUS-Black23-10 Digital 1
0V sensor
PROTEUS-White35-14 Analog Volt 3
0V sensor
PROTEUS-White35-15 Analog Volt 5
0V sensor
PROTEUS-Black23-3 Digital 4
PROTEUS-Black23-9 Digital 5
PROTEUS-Black23-11 Digital 6
PROTEUS-White35-17 Analog Volt 9
PROTEUS-Black35-19 Injector 8
PROTEUS-Black35-8 Injector 9
PROTEUS-White35-28 Analog Volt 10
PROTEUS-White35-13 Analog Volt 1
PROTEUS-Black23-2 Digital 3
PROTEUS-White35-18 Analog Volt 11
PROTEUS-Black23-16 CAN 1 Low
PROTEUS-Black23-17 CAN 1 High
PROTEUS-Black35-10 Lowside 13
PROTEUS-Black35-20 Lowside 10
PROTEUS-Black35-9 Lowside 11
PROTEUS-White35-16 Analog Volt 7
PROTEUS-White35-27 Analog Volt 8
5V ref
5V ref
PROTEUS-Black35-12 Lowside 15
PROTEUS-Black23-5 VR 1 positive
5V ref
PROTEUS-White35-25 Analog Volt 4
PROTEUS-White35-30 Intake air temp (IAT)
PROTEUS-Black23-1 Digital 2
PROTEUS-Black35-16 Injector 4
PROTEUS-Black35-15 Injector 2
0V sensor
0V sensor
PROTEUS-White35-26 Analog Volt 6
PROTEUS-White35-20 Coolant temp (CLT)
PROTEUS-Black35-33 Ignition 4
PROTEUS-Black35-34 Ignition 2
PROTEUS-Black35-3 Injector 1
PROTEUS-Black35-4 Injector 3
5V ref
5V ref
PROTEUS-White35-24 Analog Volt 2
PROTEUS-Black35-35 Ignition 1
PROTEUS-Black35-22 Ignition 3
PROTEUS-Black35-23 Lowside 16
PROTEUS-Black35-5 Injector 5
PROTEUS-White35-34 Knock 1
PROTEUS-White35-35 Knock 2
0V sensor
PROTEUS-Black35-6 Injector 6
PROTEUS-Black23-6 ETB 1 negative
PROTEUS-Black23-7 ETB 1 positive
ECM + coil power (J271 relay feed)
OEM-T121
Stock ECU being replaced
1ECU ground
2ECU ground
3Ignition switch +12V (term 15)
5Wideband lambda heater (Z19)
21ECM power (J271 relay feed)
22Brake vacuum pump (V192)
25V144 Evaporative diagnostic pump (Pin 2)
28Alternator DF terminal (charge warning)
29MAF sensor ground (G70)
33Accelerator pedal position 1 (G79)
34Accelerator pedal position 1 ground (G79)
35Accelerator pedal position 2 (G185)
36Accelerator pedal position 2 ground (G185)
38Cruise control switch (E45)
39Clutch pedal switch (F36)
40A/C signal
41A/C signal
47Check engine light (MIL)
48EPC warning light
49Power steering pressure switch (F88)
53MAF sensor signal (G70)
54Road speed signal (VSS)
55Brake pedal switch (F)
58CAN bus low
60CAN bus high
63Post-cat lambda heater (Z29)
65Fuel pump relay control
66Secondary-air pump relay (J299)
68Post-cat lambda signal (G130)
69Post-cat lambda signal (G130)
72Accelerator pedal position 1 5V supply (G79)
73Accelerator pedal position 2 5V supply (G185)
80V144 Evap Diagnostic Pump (Pin 1)
82Crank position sensor (G28)
83Throttle position sensor 5V supply (G187/G188)
84Throttle position sensor 1 (G187)
85Intake air temperature (G42)
86Camshaft position sensor (G40)
88Injector 4 (N33)
89Injector 2 (N31)
90Crank position sensor ground (G28)
91Throttle position sensor ground (G187/G188)
92Throttle position sensor 2 (G188)
93Engine coolant temperature (G62)
94Ignition coil 4 (N163)
95Ignition coil 2 (N128)
96Injector 1 (N30)
97Injector 3 (N32)
98Cam + boost sensor 5V supply (G40/G31)
99Knock sensor 5V supply (G61/G66)
101Boost pressure sensor (G31)
102Ignition coil 1 (N127)
103Ignition coil 3 (N158)
104Boost control solenoid (N75)
105Diverter valve (N249)
106Knock sensor 1 (G61)
107Knock sensor 2 (G66)
108Sensor ground
115VVT camshaft adjustment valve (N205)
117Throttle motor G186 (+)
118Throttle motor G186 (−)
121ECM + coil power (J271 relay feed)
MAIN
MAIN-R
MAIN
INRelay contact input (battery + via main fuse)
OUTRelay contact output (switched +12V bus)
COIL+Relay coil positive (ignition-switched +12V)
COIL-Relay coil negative (ECU low-side driver)
NEW-BATT
PROTEUS-Black23-23 Main relay feed
Relay coil positive (ignition-switched +12V)
SP-GND · 8 pins
PROTEUS
PROTEUS-Black23
PROTEUS
1Digital 2
2Digital 3
3Digital 4
5VR 1 positive
6ETB 1 negative
7ETB 1 positive
9Digital 5
10Digital 1
11Digital 6
13VR 1 negative
14Power ground
16CAN 1 Low
17CAN 1 High
18Ignition switch in
19Power ground
20Power ground
23Main relay feed
OEM-T121-86 Camshaft position sensor (G40)
OEM-T121-54 Road speed signal (VSS)
OEM-T121-38 Cruise control switch (E45)
OEM-T121-82 Crank position sensor (G28)
OEM-T121-117 Throttle motor G186 (+)
OEM-T121-118 Throttle motor G186 (−)
OEM-T121-39 Clutch pedal switch (F36)
OEM-T121-28 Alternator DF terminal (charge warning)
OEM-T121-40 A/C signal
SP-0V · 6 pins
GND
OEM-T121-58 CAN bus low
OEM-T121-60 CAN bus high
NEW-KEYON
GND
GND
Main relay feed
PROTEUS-Black35
PROTEUS
3Injector 1
4Injector 3
5Injector 5
6Injector 6
7Injector 7
8Injector 9
9Lowside 11
10Lowside 13
11Lowside 14
12Lowside 15
15Injector 2
16Injector 4
17Power ground
18Power ground
19Injector 8
20Lowside 10
21Lowside 12
22Ignition 3
23Lowside 16
24Power ground
33Ignition 4
34Ignition 2
35Ignition 1
OEM-T121-96 Injector 1 (N30)
OEM-T121-97 Injector 3 (N32)
OEM-T121-105 Diverter valve (N249)
OEM-T121-115 VVT camshaft adjustment valve (N205)
OEM-T121-22 Brake vacuum pump (V192)
OEM-T121-48 EPC warning light
OEM-T121-66 Secondary-air pump relay (J299)
OEM-T121-63 Post-cat lambda heater (Z29)
OEM-T121-25 V144 Evaporative diagnostic pump (Pin 2)
OEM-T121-80 V144 Evap Diagnostic Pump (Pin 1)
OEM-T121-89 Injector 2 (N31)
OEM-T121-88 Injector 4 (N33)
GND
GND
OEM-T121-47 Check engine light (MIL)
OEM-T121-65 Fuel pump relay control
OEM-T121-5 Wideband lambda heater (Z19)
OEM-T121-103 Ignition coil 3 (N158)
OEM-T121-104 Boost control solenoid (N75)
GND
OEM-T121-94 Ignition coil 4 (N163)
OEM-T121-95 Ignition coil 2 (N128)
OEM-T121-102 Ignition coil 1 (N127)
PROTEUS-White35
PROTEUS
1Sensor ground
2Sensor ground
3Sensor ground
4Sensor ground
5Sensor ground
6Sensor ground
7Sensor ground
8Sensor ground
105V supply #2
13Analog Volt 1
14Analog Volt 3
15Analog Volt 5
16Analog Volt 7
17Analog Volt 9
18Analog Volt 11
20Coolant temp (CLT)
215V supply #1
225V supply #2
23Sensor ground
24Analog Volt 2
25Analog Volt 4
26Analog Volt 6
27Analog Volt 8
28Analog Volt 10
29Sensor ground
30Intake air temp (IAT)
325V supply #1
335V supply #2
34Knock 1
35Knock 2
0V sensor
0V sensor
0V sensor
0V sensor
0V sensor
0V sensor
0V sensor
0V sensor
5V ref
OEM-T121-53 MAF sensor signal (G70)
OEM-T121-33 Accelerator pedal position 1 (G79)
OEM-T121-35 Accelerator pedal position 2 (G185)
OEM-T121-68 Post-cat lambda signal (G130)
OEM-T121-41 A/C signal
OEM-T121-55 Brake pedal switch (F)
OEM-T121-93 Engine coolant temperature (G62)
5V ref
5V ref
0V sensor
OEM-T121-101 Boost pressure sensor (G31)
OEM-T121-84 Throttle position sensor 1 (G187)
OEM-T121-92 Throttle position sensor 2 (G188)
OEM-T121-69 Post-cat lambda signal (G130)
OEM-T121-49 Power steering pressure switch (F88)
0V sensor
OEM-T121-85 Intake air temperature (G42)
5V ref
5V ref
OEM-T121-106 Knock sensor 1 (G61)
OEM-T121-107 Knock sensor 2 (G66)
◯New feed: NEW-BATT
SP-GND · 10 pins
◯New feed: NEW-KEYON
SP-14V · 3 pins
SP-0V · 18 pins
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.
83 / 83 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
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