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
5 no data
7–8 no data
T4-C2-4 Digital 1
11 no data
14 no data
T4-C1-5 PWM 1
T4-C1-4 PWM 2
T4-C1-3 PWM 3
T4-C3-22 PWM 4
22 no data
T4-C2-5 Analogue 3
T4-C2-15 Digital 5
T4-C2-3 Analogue 10
T4-C2-16 Analogue 11
T4-C3-23 PWM 5
T4-C3-17 Analogue 7
T4-C3-18 Analogue 8
31 no data
OEM-A
Stock ECU being replaced
5 no data
7–8 no data
9Vehicle speed sensor
11 no data
14 no data
15Fuel pump relay (USDM)
16Fuel pump relay (JDM)
17A/C clutch relay
20Radiator fan relay
22 no data
23Secondary O2 sensor
24Starter switch signal
26Power steering load detect
27A/C switch (request)
28Air pump relay
29Fuel tank pressure sensor
30Electrical load detector
31 no data
Power source 1 (main relay)
GND
T4-C1-17 Injector 2
T4-C1-34 Injector 3
T4-C1-25 Injector 4
6–8 no data
Power source 2 (main relay)
GND
T4-C1-9 Injector 1
RLY1-R-OUT Relay contact output (switched +12 V to load)
13–19 no data
GND
Backup power (battery constant)
GND
T4-C3-10 PWM 8
24–25 no data
OEM-B
Stock ECU being replaced
1Power source 1 (main relay)
2Power ground 1
3Injector 2
4Injector 3
5Injector 4
6–8 no data
9Power source 2 (main relay)
10Power ground 2
11Injector 1
12VTEC solenoid
13–19 no data
20Ground
21Backup power (battery constant)
22Ground
23Idle air control valve
24–25 no data
T4-C3-9 Lambda 1 Heater Negative
T4-C1-10 Coil 1
T4-C2-14 Digital 4
6 no data
0V sensor
T4-C2-12 Crank
SP-0V · 2 pins
T4-C3-25 PWM 7
T4-C1-18 Coil 2
T4-C1-1 Coil 3
T4-C1-26 Coil 4
T4-C2-6 Analogue 4
T4-C2-19 Analogue 6
T4-C2-10 Analogue 1
0V sensor
5V ref
T4-C2-22 Cam 1
SP-0V · 2 pins
23 no data
T4-C2-34 Analogue 9
T4-C2-25 Thermistor 2
T4-C2-7 Thermistor 1
T4-C2-1 Analogue 2
5V ref
T4-C2-2 Wheel 1
0V sensor
0V sensor
OEM-C
Stock ECU being replaced
1Primary O2 heater
4Ignition coil 1
5Alternator FR signal
6 no data
7Sensor ground 1
8Crank sensor + (CKP+)
9Crank sensor − (CKP−)
11Secondary O2 heater control
12Ignition coil 2
13Ignition coil 3
14Ignition coil 4
15Secondary O2 sensor
16Primary O2 sensor
17MAP sensor
18Sensor ground 2
19Sensor 5V supply 1 (MAP)
20Cam (TDC1) sensor +
21Cam (TDC1) sensor −
23 no data
24Air pump electric current sensor
25Intake air temp sensor
26Coolant temp sensor
27Throttle position sensor
28Sensor 5V supply 2
29Cam (TDC2) sensor +
30Cam (TDC2) sensor −
31Timing ground
1–16 no data
OEM-D
Stock ECU being replaced
1–16 no data
RLY1
RLY1-R
RLY1
COIL-Relay coil negative (ECU low-side driver)
COIL+Relay coil positive (switched +12 V)
INRelay contact input (switched +12 V)
OUTRelay contact output (switched +12 V to load)
T4-C3-24 PWM 6
Relay coil positive (switched +12 V)
SP-14V · 3 pins
OEM-B-12 VTEC solenoid
T4
T4-C1
T4
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-C-13 Ignition coil 3
OEM-A-17 A/C clutch relay
OEM-A-16 Fuel pump relay (JDM)
OEM-A-15 Fuel pump relay (USDM)
OEM-B-11 Injector 1
OEM-C-4 Ignition coil 1
GND
GND
OEM-B-3 Injector 2
OEM-C-12 Ignition coil 2
OEM-B-5 Injector 4
OEM-C-14 Ignition coil 4
Ignition 12v In
OEM-B-4 Injector 3
T4-C2
T4
1Analogue 2
2Wheel 1
3Analogue 10
4Digital 1
5Analogue 3
6Analogue 4
7Thermistor 1
95v Output
10Analogue 1
12Crank
14Digital 4
15Digital 5
16Analogue 11
19Analogue 6
21Sensor Ground
22Cam 1
245v Output
25Thermistor 2
33Sensor Ground
34Analogue 9
OEM-C-27 Throttle position sensor
OEM-C-29 Cam (TDC2) sensor +
OEM-A-26 Power steering load detect
OEM-A-9 Vehicle speed sensor
OEM-A-23 Secondary O2 sensor
OEM-C-15 Secondary O2 sensor
OEM-C-26 Coolant temp sensor
5V ref
OEM-C-17 MAP sensor
OEM-C-8 Crank sensor + (CKP+)
OEM-C-5 Alternator FR signal
OEM-A-24 Starter switch signal
OEM-A-27 A/C switch (request)
OEM-C-16 Primary O2 sensor
0V sensor
OEM-C-20 Cam (TDC1) sensor +
5V ref
OEM-C-25 Intake air temp sensor
0V sensor
OEM-C-24 Air pump electric current sensor
T4-C3
T4
9Lambda 1 Heater Negative
10PWM 8
17Analogue 7
18Analogue 8
22PWM 4
23PWM 5
24PWM 6
25PWM 7
26Permanent 12v
OEM-C-1 Primary O2 heater
OEM-B-23 Idle air control valve
OEM-A-29 Fuel tank pressure sensor
OEM-A-30 Electrical load detector
OEM-A-20 Radiator fan relay
OEM-A-28 Air pump relay
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
OEM-C-11 Secondary O2 heater control
Permanent 12v
SP-14V · 6 pins
SP-GND · 7 pins
SP-0V · 9 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.