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
T12-C3-31 Knock 1
Ignition power 2
Ignition power 1
GND
GND
T12-C2-22 Cam 1
T12-C2-12 Crank
GND
GND
T12-C3-3 Lambda 2 Heater Negative
11–12 no data
T12-C1-26 Coil 4
T12-C1-1 Coil 3
T12-C1-18 Coil 2
T12-C1-10 Coil 1
17 no data
T12-C2-2 Wheel 1
19 no data
5V ref
22 no data
0V sensor
27 no data
29 no data
T12-C2-10 Analogue 1
OEM-A
Stock ECU being replaced
1Knock sensor
2Ignition power 2
3Ignition power 1
4Power ground 2
5Power ground 1
6Cam position sensor (T2)
7Crank position sensor (T1)
8Logic ground 2
9Logic ground 1
10A/F sensor heater
11–12 no data
13Ignition coil 4
14Ignition coil 3
15Ignition coil 2
16Ignition coil 1
17 no data
18Vehicle speed sensor
19 no data
21Sensor voltage 1
22 no data
24Sensor ground 1
27 no data
29 no data
30MAP sensor
1 no data
T12-C1-25 Injector 4
T12-C1-34 Injector 3
T12-C1-17 Injector 2
T12-C1-9 Injector 1
RLY1-R-OUT Relay contact output (switched +12 V to load)
7 no data
T12-C2-7 Thermistor 1
9 no data
T12-C2-4 Digital 1
12 no data
T12-C2-18 Analogue 5
14 no data
T12-C3-10 PWM 8
16 no data
T12-C2-17 Thermistor 3
T12-C3-4 PWM 9
T12-C3-28 PWM 10
22–24 no data
OEM-B
Stock ECU being replaced
1 no data
2Injector 4
3Injector 3
4Injector 2
5Injector 1
6VTEC solenoid
7 no data
8Coolant temp sensor
9 no data
11VTEC oil pressure switch
12 no data
13Alternator FR signal
14 no data
15Engine mount control solenoid
16 no data
17Intake air temp sensor
18Alternator control
21Evap canister purge valve
22–24 no data
T12-C2-8 Digital 2
2–3 no data
T12-C2-11 Digital 3
5–6 no data
T12-C2-14 Digital 4
T12-C2-15 Digital 5
T12-C2-27 Digital 6
10–14 no data
16–17 no data
OEM-D
Stock ECU being replaced
1Cruise set switch
2–3 no data
4Cruise main switch
5–6 no data
7Cruise resume switch
8Brake pedal position switch
9Cruise clutch signal
10–14 no data
16–17 no data
T12-C2-25 Thermistor 2
2 no data
GND
6 no data
T12-C1-4 PWM 2
T12-C3-25 PWM 7
10 no data
T12-C3-33 CAN 2 High
T12-C3-23 PWM 5
T12-C2-19 Analogue 6
T12-C3-17 Analogue 7
T12-C3-18 Analogue 8
T12-C1-5 PWM 1
T12-C3-24 PWM 6
T12-C3-29 PWM 11
T12-C2-6 Analogue 4
T12-C3-9 Lambda 1 Heater Negative
T12-C3-19 Digital 7
23 no data
T12-C3-34 CAN 2 Low
T12-C3-30 PWM 12
T12-C3-20 Digital 8
31 no data
OEM-E
Stock ECU being replaced
1Coolant temp sensor 2
2 no data
3Logic ground 3
6 no data
7Main relay control
8A/F sensor heater relay
10 no data
11CAN H
12Radiator fan control
14Fuel tank pressure sensor
15Electrical load detector
16Power steering load detector
17Fuel pump relay
18A/C clutch relay
19Evap canister vent shut valve
20Secondary O2 sensor
21Secondary O2 heater
22Brake pedal switch
23 no data
24CAN L
25Engine speed pulse (tacho)
28A/C switch signal
31 no data
RLY1
RLY1-R
RLY1
INRelay contact input (switched +12 V)
OUTRelay contact output (switched +12 V to load)
COIL+Relay coil positive (switched +12 V)
COIL-Relay coil negative (ECU low-side driver)
SP-14V · 3 pins
OEM-B-6 VTEC solenoid
Relay coil positive (switched +12 V)
T12-C1-3 PWM 3
T12
T12-C1
T12
1Coil 3
3PWM 3
4PWM 2
5PWM 1
9Injector 1
10Coil 1
13Power Ground 1
14Power Ground 2
17Injector 2
18Coil 2
25Injector 4
26Coil 4
31Ignition 12v In
34Injector 3
OEM-A-14 Ignition coil 3
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
OEM-E-7 Main relay control
OEM-E-17 Fuel pump relay
OEM-B-5 Injector 1
OEM-A-16 Ignition coil 1
GND
GND
OEM-B-4 Injector 2
OEM-A-15 Ignition coil 2
OEM-B-2 Injector 4
OEM-A-13 Ignition coil 4
Ignition 12v In
OEM-B-3 Injector 3
T12-C2
T12
2Wheel 1
4Digital 1
5Analogue 3
6Analogue 4
7Thermistor 1
8Digital 2
95v Output
10Analogue 1
11Digital 3
12Crank
14Digital 4
15Digital 5
17Thermistor 3
18Analogue 5
19Analogue 6
21Sensor Ground
22Cam 1
25Thermistor 2
27Digital 6
33Sensor Ground
OEM-A-18 Vehicle speed sensor
OEM-B-11 VTEC oil pressure switch
TPS-J-SIG Throttle position signal
OEM-E-20 Secondary O2 sensor
OEM-B-8 Coolant temp sensor
OEM-D-1 Cruise set switch
5V ref
OEM-A-30 MAP sensor
OEM-D-4 Cruise main switch
OEM-A-7 Crank position sensor (T1)
OEM-D-7 Cruise resume switch
OEM-D-8 Brake pedal position switch
OEM-B-17 Intake air temp sensor
OEM-B-13 Alternator FR signal
OEM-E-14 Fuel tank pressure sensor
0V sensor
OEM-A-6 Cam position sensor (T2)
OEM-E-1 Coolant temp sensor 2
OEM-D-9 Cruise clutch signal
0V sensor
T12-C3
T12
3Lambda 2 Heater Negative
4PWM 9
9Lambda 1 Heater Negative
10PWM 8
17Analogue 7
18Analogue 8
19Digital 7
20Digital 8
23PWM 5
24PWM 6
25PWM 7
28PWM 10
29PWM 11
30PWM 12
31Knock 1
33CAN 2 High
34CAN 2 Low
OEM-A-10 A/F sensor heater
OEM-B-18 Alternator control
OEM-E-21 Secondary O2 heater
OEM-B-15 Engine mount control solenoid
OEM-E-15 Electrical load detector
OEM-E-16 Power steering load detector
OEM-E-22 Brake pedal switch
OEM-E-28 A/C switch signal
OEM-E-12 Radiator fan control
OEM-E-18 A/C clutch relay
OEM-E-8 A/F sensor heater relay
OEM-B-21 Evap canister purge valve
OEM-E-19 Evap canister vent shut valve
OEM-E-25 Engine speed pulse (tacho)
OEM-A-1 Knock sensor
OEM-E-11 CAN H
OEM-E-24 CAN L
TPS
TPS-J
TPS
GNDSensor ground
SIGThrottle position signal
VCC5V supply in
0V sensor
T12-C2-5 Analogue 3
5V supply in
SP-14V · 6 pins
SP-GND · 8 pins
SP-5V1 · 5 pins
SP-0V · 5 pins
SP-5V · 5 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.