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
ME221-C1-53 KNOCK 1 SIGNAL
Ignition power 2
Ignition power 1
GND
GND
ME221-C1-22 CAM A VR+
ME221-C1-80 CRANK VR+
GND
GND
ME221-C1-42 LOW SIDE RELAY 12
11–12 no data
ME221-C1-1 COIL 4
ME221-C1-2 COIL 3
ME221-C1-31 COIL 2
ME221-C1-32 COIL 1
17 no data
ME221-C1-6 DIG_IN 1
19 no data
5V ref
5V ref
22 no data
0V sensor
0V sensor
ME221-C1-56 ANA VOLT 2
ME221-C1-17 ANA VOLT 3
27 no data
29 no data
ME221-C1-26 ANA VOLT 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
20Sensor voltage 2
21Sensor voltage 1
22 no data
23Sensor ground 2
24Sensor ground 1
25Accelerator pedal position B
26Accelerator pedal position A
27 no data
29 no data
30MAP sensor
1 no data
ME221-C1-3 INJECTOR 4
ME221-C1-33 INJECTOR 3
ME221-C1-4 INJECTOR 2
ME221-C1-63 INJECTOR 1
RLY1-R-OUT Relay contact output (switched +12 V to load)
7 no data
ME221-C1-86 ANA TEMP 1
9 no data
ME221-C1-7 DIG_IN 2
12 no data
14 no data
ME221-C1-72 LOW SIDE RELAY 13
16 no data
ME221-C1-43 LOW SIDE RELAY 14
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
14 no data
15Engine mount control solenoid
16 no data
18Alternator control
22–24 no data
2–3 no data
5–6 no data
10–14 no data
ME221-C1-44 LOW SIDE 4
16–17 no data
OEM-D
Stock ECU being replaced
2–3 no data
5–6 no data
10–14 no data
15Throttle actuator relay
16–17 no data
ME221-C1-57 ANA TEMP 2
2 no data
GND
0V sensor
5V ref
6 no data
ME221-C1-12 LOW SIDE 2
ME221-C1-16 LSU HEATER -VE
10 no data
ME221-C1-21 CAN 1 HIGH
ME221-C1-69 LOW SIDE 5
ME221-C1-73 LOW SIDE 1
ME221-C1-39 LOW SIDE 6
ME221-C1-37 LOW SIDE RELAY 11
23 no data
ME221-C1-51 CAN 1 LOW
ME221-C1-79 TACHOMETER
31 no data
OEM-E
Stock ECU being replaced
1Coolant temp sensor 2
2 no data
3Logic ground 3
4Sensor ground 3
5Sensor voltage 3
6 no data
7Main relay control
8A/F sensor heater relay
10 no data
11CAN H
12Radiator fan control
17Fuel pump relay
18A/C clutch relay
21Secondary O2 heater
23 no data
24CAN L
25Engine speed pulse (tacho)
31 no data
ME221
ME221-C1
ME221
1COIL 4
2COIL 3
3INJECTOR 4
4INJECTOR 2
6DIG_IN 1
7DIG_IN 2
10GROUND CHASSIS
12LOW SIDE 2
15IGN +12V
16LSU HEATER -VE
17ANA VOLT 3
18ANA VOLT 4
21CAN 1 HIGH
22CAM A VR+
26ANA VOLT 1
31COIL 2
32COIL 1
33INJECTOR 3
37LOW SIDE RELAY 11
39LOW SIDE 6
42LOW SIDE RELAY 12
43LOW SIDE RELAY 14
44LOW SIDE 4
455V REF
465V REF
51CAN 1 LOW
52SENSORS GROUND
53KNOCK 1 SIGNAL
56ANA VOLT 2
57ANA TEMP 2
61GROUND
63INJECTOR 1
64VBAT
67Stepper 1 / A1
68Stepper 2 / A2
69LOW SIDE 5
72LOW SIDE RELAY 13
73LOW SIDE 1
74LOW SIDE 3
765V REF
79TACHOMETER
80CRANK VR+
84Sensor Ground
86ANA TEMP 1
89GROUND
90GROUND
OEM-A-13 Ignition coil 4
OEM-A-14 Ignition coil 3
OEM-B-2 Injector 4
OEM-B-4 Injector 2
OEM-A-18 Vehicle speed sensor
OEM-B-11 VTEC oil pressure switch
GND
OEM-E-7 Main relay control
IGN +12V
OEM-E-8 A/F sensor heater relay
OEM-A-26 Accelerator pedal position A
TB-J-TPS1 Throttle position 1
OEM-E-11 CAN H
OEM-A-6 Cam position sensor (T2)
OEM-A-30 MAP sensor
OEM-A-15 Ignition coil 2
OEM-A-16 Ignition coil 1
OEM-B-3 Injector 3
OEM-E-21 Secondary O2 heater
OEM-E-18 A/C clutch relay
OEM-A-10 A/F sensor heater
OEM-B-18 Alternator control
OEM-D-15 Throttle actuator relay
5V ref
5V ref
OEM-E-24 CAN L
0V sensor
OEM-A-1 Knock sensor
OEM-A-25 Accelerator pedal position B
OEM-E-1 Coolant temp sensor 2
GND
OEM-B-5 Injector 1
VBAT
TB-J-M+ Throttle motor +
TB-J-M- Throttle motor −
OEM-E-12 Radiator fan control
OEM-B-15 Engine mount control solenoid
OEM-E-17 Fuel pump relay
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
5V ref
OEM-E-25 Engine speed pulse (tacho)
OEM-A-7 Crank position sensor (T1)
0V sensor
OEM-B-8 Coolant temp sensor
GND
GND
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 · 4 pins
OEM-B-6 VTEC solenoid
Relay coil positive (switched +12 V)
ME221-C1-74 LOW SIDE 3
TB
TB-J
TB
M+Throttle motor +
M-Throttle motor −
GNDThrottle sensor ground
TPS1Throttle position 1
VCCThrottle sensor 5V supply
ME221-C1-67 Stepper 1 / A1
ME221-C1-68 Stepper 2 / A2
0V sensor
ME221-C1-18 ANA VOLT 4
Throttle sensor 5V supply
SP-GND · 10 pins
SP-14V · 7 pins
SP-5V1 · 4 pins
SP-0V · 7 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.