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
ECU power +14V (main relay)
ME221-C1-7 DIG_IN 2
ME221-C1-39 LOW SIDE 6
ME221-C1-32 COIL 1
ME221-C1-31 COIL 2
ME221-C1-73 LOW SIDE 1
ME221-C1-37 LOW SIDE RELAY 11
ME221-C1-6 DIG_IN 1
ME221-C1-18 ANA VOLT 4
ME221-C1-12 LOW SIDE 2
OEM-1
Stock ECU being replaced
BECU power +14V (main relay)
CStart signal
EMalfunction indicator lamp (MIL)
GIgnition 1 (coils 1+4, wasted spark)
HIgnition 2 (coils 2+3, wasted spark)
JA/C relay
LCoolant fan relay
MVehicle speed
OStop light switch
RCooling fan relay
GND
GND
0V sensor
0V sensor
ME221-C1-80 CRANK VR+
0V sensor
ME221-C1-22 CAM A VR+
ME221-C1-79 TACHOMETER
5V ref
ME221-C1-42 LOW SIDE RELAY 12
ME221-C1-56 ANA VOLT 2
ME221-C1-17 ANA VOLT 3
ME221-C1-26 ANA VOLT 1
ME221-C1-57 ANA TEMP 2
ME221-C1-86 ANA TEMP 1
ME221-C1-72 LOW SIDE RELAY 13
ME221-C1-74 LOW SIDE 3
ME221-C1-44 LOW SIDE 4
ME221-C1-63 INJECTOR 1
ME221-C1-4 INJECTOR 2
ME221-C1-69 LOW SIDE 5
ME221-C1-43 LOW SIDE RELAY 14
ME221-C1-33 INJECTOR 3
ME221-C1-3 INJECTOR 4
OEM-2
Stock ECU being replaced
APower ground
BPower ground
CSensor ground (E2)
DSensor ground (E2)
ECrank position (CAS NE)
FMAF ground
GCam position (CAS G)
ITachometer output
K+5V sensor supply
LRear defroster relay
MThrottle position (TPS)
NO2 sensor
OMass air flow (MAF)
PIntake air temperature (IAT)
QCoolant temperature (ECT)
RPRC solenoid (fuel pressure regulator)
SCondenser fan relay
TFuel pump relay
UInjector 1
VInjector 2
WISC solenoid
XEvap purge solenoid
YInjector 3
ZInjector 4
ME221
ME221-C1
ME221
3INJECTOR 4
4INJECTOR 2
6DIG_IN 1
7DIG_IN 2
10GROUND CHASSIS
12LOW SIDE 2
15IGN +12V
17ANA VOLT 3
18ANA VOLT 4
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
52SENSORS GROUND
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+
84Sensor Ground
86ANA TEMP 1
89GROUND
90GROUND
OEM-2-Z Injector 4
OEM-2-V Injector 2
OEM-1-M Vehicle speed
OEM-1-C Start signal
GND
OEM-1-R Cooling fan relay
IGN +12V
OEM-2-N O2 sensor
OEM-1-O Stop light switch
OEM-2-G Cam position (CAS G)
OEM-2-O Mass air flow (MAF)
OEM-1-H Ignition 2 (coils 2+3, wasted spark)
OEM-1-G Ignition 1 (coils 1+4, wasted spark)
OEM-2-Y Injector 3
OEM-1-L Coolant fan relay
OEM-1-E Malfunction indicator lamp (MIL)
OEM-2-L Rear defroster relay
OEM-2-X Evap purge solenoid
OEM-2-T Fuel pump relay
5V ref
0V sensor
OEM-2-M Throttle position (TPS)
OEM-2-P Intake air temperature (IAT)
GND
OEM-2-U Injector 1
VBAT
OEM-2-W ISC solenoid
OEM-2-R PRC solenoid (fuel pressure regulator)
OEM-1-J A/C relay
OEM-2-S Condenser fan relay
OEM-2-I Tachometer output
OEM-2-E Crank position (CAS NE)
0V sensor
OEM-2-Q Coolant temperature (ECT)
GND
GND
SP-14V · 4 pins
SP-0V · 6 pins
SP-GND · 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.
42 / 42 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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