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 (+B2, main relay)
GND
ME221-C1-57 ANA TEMP 2
ME221-C1-6 DIG_IN 1
ME221-C1-7 DIG_IN 2
ME221-C1-51 CAN 1 LOW
ME221-C1-21 CAN 1 HIGH
ME221-C1-44 LOW SIDE 4
0V sensor
OEM-A33
Stock ECU being replaced
1ECU power (+B2, main relay)
4Power ground (EC)
12Intake air temperature (THA, in MAF)
14Starter signal (STSW2)
15Clutch switch (CLSW)
18CAN low (CANL)
19CAN high (CANH)
20Blower relay (HB)
29MAF sensor ground (E2G)
GND
GND
GND
ME221-C1-37 LOW SIDE RELAY 11
ECU power (+B, main relay)
ME221-C1-22 CAM A VR+
ME221-C1-80 CRANK VR+
ME221-C1-23 CAM A VR-
0V sensor
ME221-C1-53 KNOCK 1 SIGNAL
5V ref
OEM-A34
Stock ECU being replaced
1Power ground (E03)
2Power ground (E04)
3Power ground (E05)
5A/F ratio sensor heater (HA1A)
6ECU power (+B, main relay)
14VVT cam sensor exhaust bank 1 (EV1+)
16Crank position (NE+)
26VVT cam sensor intake bank 1 (VV1+)
27Crank position return (NE-)
28Knock sensor 1 (KNK1)
34OCV power source (VCV, 5V)
ME221-C1-16 LSU HEATER -VE
ME221-C1-74 LOW SIDE 3
ME221-C1-12 LOW SIDE 2
ME221-C1-73 LOW SIDE 1
ME221-C1-79 TACHOMETER
ME221-C1-69 LOW SIDE 5
5V ref
5V ref
ME221-C1-17 ANA VOLT 3
0V sensor
0V sensor
ME221-C1-26 ANA VOLT 1
ME221-C1-39 LOW SIDE 6
OEM-A35
Stock ECU being replaced
5Injector relay (IREL)
11Cooling fan relay 3 (FAN1)
12Cooling fan relay 2 (FAN2)
13EFI main relay 1 (SSHUT)
15Tachometer output (TACH)
17ETCS relay (MCR)
21Accelerator pedal 5V supply (VCPA)
22Accelerator pedal 5V supply (VCP2)
23Accelerator pedal position (VPA)
29Accelerator pedal ground (EPA)
30Accelerator pedal ground (EPA2)
31Accelerator pedal position 2 (VPA2)
35A/C clutch relay (AC)
GND
GND
ME221-C1-42 LOW SIDE RELAY 12
ME221-C1-43 LOW SIDE RELAY 14
ME221-C1-1 COIL 4
ME221-C1-31 COIL 2
ME221-C1-63 INJECTOR 1
ME221-C1-33 INJECTOR 3
ME221-C1-4 INJECTOR 2
ME221-C1-72 LOW SIDE RELAY 13
ME221-C1-18 ANA VOLT 4
5V ref
ME221-C1-32 COIL 1
ME221-C1-33 INJECTOR 3
ME221-C1-3 INJECTOR 4
ME221-C1-63 INJECTOR 1
ME221-C1-3 INJECTOR 4
ME221-C1-56 ANA VOLT 2
0V sensor
ME221-C1-86 ANA TEMP 1
ME221-C1-2 COIL 3
ME221-C1-4 INJECTOR 2
OEM-A36
Stock ECU being replaced
3Power ground (E02)
4Power ground (E01)
6Heated oxygen sensor heater (HT1B)
7OCV exhaust bank 1 (OE1)
8Ignition coil 4 (IGT4)
10Ignition coil 2 (IGT2)
12Injector 1 port (#10)
13Injector 4 port (#40)
14Injector 1 direct (#1)
17OCV intake bank 1 (OC1)
18Throttle position (VTA1)
19Sensor 5V supply (VC)
21Ignition coil 1 (IGT1)
22Injector 2 port (#20)
23Injector 4 direct (#4)
24Injector 3 direct (#3)
25Injector 2 direct (#2)
28Throttle position 2 (VTA2)
29Sensor ground (E1)
30Engine coolant temperature (THW)
31Ignition coil 3 (IGT3)
32Injector 3 port (#30)
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+
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
51CAN 1 LOW
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+
84Sensor Ground
86ANA TEMP 1
89GROUND
90GROUND
OEM-A36-8 Ignition coil 4 (IGT4)
OEM-A36-31 Ignition coil 3 (IGT3)
Injector 4 direct (#4) · 2 pins
Injector 3 port (#30) · 2 pins
OEM-A33-14 Starter signal (STSW2)
OEM-A33-15 Clutch switch (CLSW)
GND
OEM-A35-12 Cooling fan relay 2 (FAN2)
IGN +12V
OEM-A35-5 Injector relay (IREL)
OEM-A35-23 Accelerator pedal position (VPA)
OEM-A36-18 Throttle position (VTA1)
OEM-A33-19 CAN high (CANH)
OEM-A34-14 VVT cam sensor exhaust bank 1 (EV1+)
OEM-A34-26 VVT cam sensor intake bank 1 (VV1+)
OEM-A35-31 Accelerator pedal position 2 (VPA2)
OEM-A36-10 Ignition coil 2 (IGT2)
OEM-A36-21 Ignition coil 1 (IGT1)
Injector 2 port (#20) · 2 pins
OEM-A34-5 A/F ratio sensor heater (HA1A)
OEM-A35-35 A/C clutch relay (AC)
OEM-A36-6 Heated oxygen sensor heater (HT1B)
OEM-A36-7 OCV exhaust bank 1 (OE1)
OEM-A33-20 Blower relay (HB)
5V ref
OEM-A33-18 CAN low (CANL)
0V sensor
OEM-A34-28 Knock sensor 1 (KNK1)
OEM-A36-28 Throttle position 2 (VTA2)
OEM-A33-12 Intake air temperature (THA, in MAF)
GND
INJECTOR 1 · 2 pins
VBAT
OEM-A35-17 ETCS relay (MCR)
OEM-A36-17 OCV intake bank 1 (OC1)
OEM-A35-13 EFI main relay 1 (SSHUT)
OEM-A35-11 Cooling fan relay 3 (FAN1)
OEM-A35-15 Tachometer output (TACH)
OEM-A34-16 Crank position (NE+)
0V sensor
OEM-A36-30 Engine coolant temperature (THW)
GND
GND
SP-14V · 5 pins
SP-GND · 11 pins
SP-0V · 8 pins
SP-5V1 · 6 pins
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