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
RLY1-R-OUT Relay contact output (switched +12 V to load)
RLY2-R-OUT Relay contact output (switched +12 V to load)
OEM-5
Stock ECU being replaced
F5Front VTEC solenoid valve
F7Rear VTEC solenoid valve
ME221-C1-63 INJECTOR 1
ME221-C1-3 INJECTOR 4
ME221-C1-4 INJECTOR 2
ME221-C1-63 INJECTOR 1
ME221-C1-33 INJECTOR 3
ME221-C1-4 INJECTOR 2
ME221-C1-43 LOW SIDE RELAY 14
ME221-C1-37 LOW SIDE RELAY 11
ME221-C1-16 LSU HEATER -VE
ME221-C1-44 LOW SIDE 4
ME221-C1-74 LOW SIDE 3
ME221-C1-69 LOW SIDE 5
ME221-C1-39 LOW SIDE 6
ME221-C1-42 LOW SIDE RELAY 12
ME221-C1-72 LOW SIDE RELAY 13
ME221-C1-32 COIL 1
ME221-C1-31 COIL 2
GND
GND
ECU power (IGP1)
0V sensor
OEM-A
Stock ECU being replaced
1Injector 1
2Injector 4
3Injector 2
4Injector 5
5Injector 3
6Injector 6
7Main relay
8Fuel pump relay 2 (FLR2)
10Front O2 sensor heater (HTCNTF)
11EGR control solenoid
12Rear O2 sensor heater (HTCNTR)
13Check engine light (WARN)
14Chamber volume control solenoid (BPS)
15A/C clutch relay (ACC)
18Radiator fan control (FANCNTR)
21Ignition coil 1
22Ignition coil 2
23Power ground (PG1)
24Power ground (PG2)
25ECU power (IGP1)
26Sensor ground (LG1)
GND
ME221-C1-1 COIL 4
ME221-C1-2 COIL 3
ME221-C1-23 CAM A VR-
0V sensor
ME221-C1-22 CAM A VR+
0V sensor
ME221-C1-81 CRANK VR-
0V sensor
ME221-C1-80 CRANK VR+
0V sensor
OEM-B
Stock ECU being replaced
2Chassis ground (LG2)
6Ignition coil 4
8Ignition coil 3
9CYL 2P — CYP sensor 2 signal
10CYL 2M — CYP sensor 2 return
11CYL 1P — CYP sensor 1 signal
12CYL 1M — CYP sensor 1 return
13CRNK 2P — TDC sensor signal
14CRNK 2M — TDC sensor return
15CRNK 1P — crank sensor signal
16CRNK 1M — crank sensor return
ECU power (IGP2)
ME221-C1-6 DIG_IN 1
ME221-C1-79 TACHOMETER
OEM-C
Stock ECU being replaced
1ECU power (IGP2)
2Vehicle speed sensor (VSS)
4Tachometer output (NEP)
ME221-C1-53 KNOCK 1 SIGNAL
ME221-C1-7 DIG_IN 2
ME221-C1-56 ANA VOLT 2
ME221-C1-86 ANA TEMP 1
ME221-C1-17 ANA VOLT 3
ME221-C1-57 ANA TEMP 2
ME221-C1-18 ANA VOLT 4
ME221-C1-26 ANA VOLT 1
5V ref
5V ref
5V ref
0V sensor
0V sensor
OEM-D
Stock ECU being replaced
4Knock sensor — front
9Alternator FR signal
11Throttle position sensor (TPS)
13Engine coolant temperature (ECT)
14Primary O2 sensor
15Intake air temperature (IAT)
16Secondary O2 sensor
17MAP sensor
18+5V sensor supply (VCC)
19+5V sensor supply (VCC)
20+5V sensor supply (VCC)
21Sensor ground (SG)
22Sensor ground (SG)
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
22CAM A VR+
23CAM 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
52SENSORS GROUND
53KNOCK 1 SIGNAL
56ANA VOLT 2
57ANA TEMP 2
61GROUND
63INJECTOR 1
64VBAT
69LOW SIDE 5
72LOW SIDE RELAY 13
73LOW SIDE 1
74LOW SIDE 3
79TACHOMETER
80CRANK VR+
81CRANK VR-
84Sensor Ground
86ANA TEMP 1
89GROUND
90GROUND
OEM-B-6 Ignition coil 4
OEM-B-8 Ignition coil 3
OEM-A-2 Injector 4
INJECTOR 2 · 2 pins
OEM-C-2 Vehicle speed sensor (VSS)
OEM-D-9 Alternator FR signal
GND
RLY2-R-COIL- Relay coil negative (ECU low-side driver)
IGN +12V
OEM-A-10 Front O2 sensor heater (HTCNTF)
OEM-D-14 Primary O2 sensor
OEM-D-16 Secondary O2 sensor
OEM-B-11 CYL 1P — CYP sensor 1 signal
OEM-B-9 CYL 2P — CYP sensor 2 signal
OEM-D-17 MAP sensor
OEM-A-22 Ignition coil 2
OEM-A-21 Ignition coil 1
OEM-A-5 Injector 3
OEM-A-8 Fuel pump relay 2 (FLR2)
OEM-A-14 Chamber volume control solenoid (BPS)
OEM-A-15 A/C clutch relay (ACC)
OEM-A-7 Main relay
OEM-A-11 EGR control solenoid
5V ref
0V sensor
OEM-D-4 Knock sensor — front
OEM-D-11 Throttle position sensor (TPS)
OEM-D-15 Intake air temperature (IAT)
GND
Injector 1 · 2 pins
VBAT
OEM-A-13 Check engine light (WARN)
OEM-A-18 Radiator fan control (FANCNTR)
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
OEM-A-12 Rear O2 sensor heater (HTCNTR)
OEM-C-4 Tachometer output (NEP)
OEM-B-15 CRNK 1P — crank sensor signal
OEM-B-13 CRNK 2P — TDC sensor signal
0V sensor
OEM-D-13 Engine coolant temperature (ECT)
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 · 6 pins
OEM-5-F5 Front VTEC solenoid valve
Relay coil positive (switched +12 V)
ME221-C1-73 LOW SIDE 1
RLY2
RLY2-R
RLY2
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 · 6 pins
OEM-5-F7 Rear VTEC solenoid valve
Relay coil positive (switched +12 V)
ME221-C1-12 LOW SIDE 2
SP-GND · 8 pins
SP-0V · 10 pins
SP-14V · 9 pins
SP-5V1 · 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.
65 / 65 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
| Wire | From | To | Signal | Gauge | Colour | Stripe | Ident | Flags | |
|---|---|---|---|---|---|---|---|---|---|
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — | |||||||||
| — |