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-C1-68 Stepper 2 / A2
5 no data
7–8 no data
ME221-C1-6 DIG_IN 1
11 no data
ME221-C1-70 Stepper 3 / B1
14 no data
ME221-C1-73 LOW SIDE 1
ME221-C1-12 LOW SIDE 2
ME221-C1-74 LOW SIDE 3
ME221-C1-71 Stepper 4 / B2
ME221-C1-79 TACHOMETER
ME221-C1-44 LOW SIDE 4
22 no data
ME221-C1-17 ANA VOLT 3
ME221-C1-69 LOW SIDE 5
31 no data
OEM-A
Stock ECU being replaced
1Coolant temp gauge drive
5 no data
7–8 no data
9Vehicle speed sensor
11 no data
12Immobilizer indicator light
14 no data
15Fuel pump relay (USDM)
16Fuel pump relay (JDM)
17A/C clutch relay
18Check engine light (MIL)
19Tacho output
20Radiator fan relay
22 no data
23Secondary O2 sensor
28Air pump relay
31 no data
Power source 1 (main relay)
GND
ME221-C1-4 INJECTOR 2
ME221-C1-33 INJECTOR 3
ME221-C1-3 INJECTOR 4
6–8 no data
Power source 2 (main relay)
GND
ME221-C1-63 INJECTOR 1
RLY1-R-OUT Relay contact output (switched +12 V to load)
13–19 no data
GND
GND
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
22Ground
24–25 no data
ME221-C1-16 LSU HEATER -VE
ME221-C1-32 COIL 1
ME221-C1-7 DIG_IN 2
6 no data
0V sensor
ME221-C1-81 CRANK VR+
SP-0V · 2 pins
ME221-C1-67 Stepper 1 / A1
ME221-C1-31 COIL 2
ME221-C1-2 COIL 3
ME221-C1-1 COIL 4
ME221-C1-18 ANA VOLT 4
ME221-C1-26 ANA VOLT 1
0V sensor
5V ref
ME221-C1-22 CAM A VR+
SP-0V · 2 pins
23 no data
ME221-C1-57 ANA TEMP 2
ME221-C1-86 ANA TEMP 1
ME221-C1-56 ANA VOLT 2
5V ref
ME221-C1-23 CAM A VR-
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
17MAP sensor
18Sensor ground 2
19Sensor 5V supply 1 (MAP)
20Cam (TDC1) sensor +
21Cam (TDC1) sensor −
23 no data
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
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
39LOW SIDE 6
44LOW SIDE 4
455V REF
465V REF
52SENSORS GROUND
56ANA VOLT 2
57ANA TEMP 2
61GROUND
63INJECTOR 1
64VBAT
67Stepper 1 / A1
68Stepper 2 / A2
69LOW SIDE 5
70Stepper 3 / B1
71Stepper 4 / B2
73LOW SIDE 1
74LOW SIDE 3
79TACHOMETER
81CRANK VR+
84Sensor Ground
86ANA TEMP 1
89GROUND
90GROUND
OEM-C-14 Ignition coil 4
OEM-C-13 Ignition coil 3
OEM-B-5 Injector 4
OEM-B-3 Injector 2
OEM-A-9 Vehicle speed sensor
OEM-C-5 Alternator FR signal
GND
OEM-A-16 Fuel pump relay (JDM)
IGN +12V
OEM-C-1 Primary O2 heater
OEM-A-23 Secondary O2 sensor
OEM-C-15 Secondary O2 sensor
OEM-C-20 Cam (TDC1) sensor +
OEM-C-29 Cam (TDC2) sensor +
OEM-C-17 MAP sensor
OEM-C-12 Ignition coil 2
OEM-C-4 Ignition coil 1
OEM-B-4 Injector 3
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
OEM-A-20 Radiator fan relay
5V ref
5V ref
0V sensor
OEM-C-27 Throttle position sensor
OEM-C-25 Intake air temp sensor
GND
OEM-B-11 Injector 1
VBAT
OEM-C-11 Secondary O2 heater control
OEM-A-1 Coolant temp gauge drive
OEM-A-28 Air pump relay
OEM-A-12 Immobilizer indicator light
OEM-A-18 Check engine light (MIL)
OEM-A-15 Fuel pump relay (USDM)
OEM-A-17 A/C clutch relay
OEM-A-19 Tacho output
OEM-C-8 Crank sensor + (CKP+)
0V sensor
OEM-C-26 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-12 VTEC solenoid
Relay coil positive (switched +12 V)
ME221-C1-39 LOW SIDE 6
SP-GND · 9 pins
SP-14V · 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.
56 / 56 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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