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
ME442-C1-42 LOW SIDE RELAY 12
ME442-C1-13 LOW SIDE RELAY 15
ME442-C1-75 LOW SIDE RELAY 16
ME442-C1-40 LOW SIDE RELAY 17
5 no data
ME442-C1-9 LOW SIDE RELAY 18
7–8 no data
ME442-C1-6 DIG_IN 1
11 no data
ME442-C1-72 LOW SIDE RELAY 13
14 no data
ME442-C1-73 LOW SIDE 1
ME442-C1-74 LOW SIDE 3
ME442-C1-44 LOW SIDE 4
ME442-C1-43 LOW SIDE RELAY 14
ME442-C1-79 TACHOMETER
ME442-C1-69 LOW SIDE 5
22 no data
ME442-C1-17 ANA VOLT 3
ME442-C1-8 DIG_IN 3
ME442-C1-5 DIG_IN 4
ME442-C1-62 DIG_IN 5
ME442-C1-39 LOW SIDE 6
ME442-C1-78 ANA VOLT 6
ME442-C1-48 ANA VOLT 7
31 no data
ME442-C1-34 DIG_IN 6
OEM-A
Stock ECU being replaced
1Coolant temp gauge drive
2Air control valve solenoid
3Evap bypass solenoid
4Evap canister vent shut valve
5 no data
6Evap canister purge valve
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
24Starter switch signal
26Power steering load detect
27A/C switch (request)
28Air pump relay
29Fuel tank pressure sensor
30Electrical load detector
31 no data
32Brake switch
Power source 1 (main relay)
GND
ME442-C1-4 INJECTOR 2
ME442-C1-33 INJECTOR 3
ME442-C1-3 INJECTOR 4
6–8 no data
Power source 2 (main relay)
GND
ME442-C1-63 INJECTOR 1
RLY1-R-OUT Relay contact output (switched +12 V to load)
13–19 no data
GND
GND
ME442-C1-28 INJECTOR 5
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
23Idle air control valve
24–25 no data
ME442-C1-16 LSU HEATER -VE
ME442-C1-58 INJECTOR 6
ME442-C1-32 COIL 1
ME442-C1-7 DIG_IN 2
6 no data
0V sensor
ME442-C1-80 CRANK VR+
SP-0V · 2 pins
ME442-C1-37 LOW SIDE RELAY 11
ME442-C1-31 COIL 2
ME442-C1-2 COIL 3
ME442-C1-1 COIL 4
ME442-C1-18 ANA VOLT 4
ME442-C1-87 ANA VOLT 5
ME442-C1-26 ANA VOLT 1
0V sensor
5V ref
ME442-C1-22 CAM A VR+
SP-0V · 2 pins
23 no data
ME442-C1-57 ANA TEMP 2
ME442-C1-86 ANA TEMP 1
ME442-C1-56 ANA VOLT 2
5V ref
ME442-C1-23 CAM A VR-
0V sensor
0V sensor
OEM-C
Stock ECU being replaced
1Primary O2 heater
2Alternator control
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
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
ME442
ME442-C1
ME442
1COIL 4
2COIL 3
3INJECTOR 4
4INJECTOR 2
5DIG_IN 4
6DIG_IN 1
7DIG_IN 2
8DIG_IN 3
9LOW SIDE RELAY 18
10GROUND CHASSIS
12LOW SIDE 2
13LOW SIDE RELAY 15
15IGN +12V
16LSU HEATER -VE
17ANA VOLT 3
18ANA VOLT 4
22CAM A VR+
23CAM A VR-
26ANA VOLT 1
28INJECTOR 5
31COIL 2
32COIL 1
33INJECTOR 3
34DIG_IN 6
37LOW SIDE RELAY 11
39LOW SIDE 6
40LOW SIDE RELAY 17
42LOW SIDE RELAY 12
43LOW SIDE RELAY 14
44LOW SIDE 4
455V REF
465V REF
48ANA VOLT 7
52SENSORS GROUND
56ANA VOLT 2
57ANA TEMP 2
58INJECTOR 6
61GROUND
62DIG_IN 5
63INJECTOR 1
64VBAT
69LOW SIDE 5
72LOW SIDE RELAY 13
73LOW SIDE 1
74LOW SIDE 3
75LOW SIDE RELAY 16
78ANA VOLT 6
79TACHOMETER
80CRANK VR+
84Sensor Ground
86ANA TEMP 1
87ANA VOLT 5
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-26 Power steering load detect
OEM-A-9 Vehicle speed sensor
OEM-C-5 Alternator FR signal
OEM-A-24 Starter switch signal
OEM-A-6 Evap canister purge valve
GND
RLY1-R-COIL- Relay coil negative (ECU low-side driver)
OEM-A-2 Air control valve solenoid
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-B-23 Idle air control valve
OEM-C-12 Ignition coil 2
OEM-C-4 Ignition coil 1
OEM-B-4 Injector 3
OEM-A-32 Brake switch
OEM-C-11 Secondary O2 heater control
OEM-A-28 Air pump relay
OEM-A-4 Evap canister vent shut valve
OEM-A-1 Coolant temp gauge drive
OEM-A-18 Check engine light (MIL)
OEM-A-17 A/C clutch relay
5V ref
5V ref
OEM-A-30 Electrical load detector
0V sensor
OEM-C-27 Throttle position sensor
OEM-C-25 Intake air temp sensor
OEM-C-2 Alternator control
GND
OEM-A-27 A/C switch (request)
OEM-B-11 Injector 1
VBAT
OEM-A-20 Radiator fan relay
OEM-A-12 Immobilizer indicator light
OEM-A-15 Fuel pump relay (USDM)
OEM-A-16 Fuel pump relay (JDM)
OEM-A-3 Evap bypass solenoid
OEM-A-29 Fuel tank pressure sensor
OEM-A-19 Tacho output
OEM-C-8 Crank sensor + (CKP+)
0V sensor
OEM-C-26 Coolant temp sensor
OEM-C-16 Primary O2 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)
ME442-C1-12 LOW SIDE 2
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.