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
KV12-B-1 Injection Channel 1
KV12-D-9 EFI Relay Output (Low Side 200mA)
KV12-B-14 Auxiliary Output 5
KV12-B-2 Injection Channel 2
KV12-B-12 Auxiliary Output 3
KV12-B-13 Auxiliary Output 4
KV12-B-3 Injection Channel 3
KV12-B-5 Injection Channel 5
KV12-B-6 Injection Channel 6
KV12-B-4 Injection Channel 4
KV12-B-15 Auxiliary Output 6
L no data
KV12-B-16 Auxiliary Output 7
KV12-B-7 Injection Channel 7
KV12-B-10 Auxiliary Output 1
ISC valve +14V feed
KV12-B-11 Auxiliary Output 2
KV12-B-8 Injection Channel 8
OEM-2
Stock ECU being replaced
AInjector 1
BCooling fan relay
CCondenser fan relay
DInjector 2
EEGR valve
FEGR valve
GInjector 3
HEGR valve
IEGR valve
JInjector 4
KA/C clutch relay
L no data
MFuel pump relay
NVTCS solenoid (intake butterflies)
OFuel pump relay (non-immobiliser)
PISC valve +14V feed
QISC valve low side
RMalfunction indicator lamp (MIL)
GND
GND
KV12-A-1 Injection Channel 9
E no data
KV12-B-26 Ignition Channel 1
G no data
KV12-B-17 Auxiliary Output 8
KV12-B-27 Ignition Channel 2
KV12-A-10 Lambda 1 Heater -
KV12-A-2 Injection Channel 10
L no data
KV12-A-3 Injection Channel 11
N no data
KV12-A-11 Lambda 2 Heater -
R no data
KV12-C-28 Digital Input 2
KV12-C-27 Digital Input 1
KV12-A-4 Injection Channel 12
KV12-D-6 Sync Sensor +
W–X no data
KV12-D-4 Crank Index Sensor +
Z no data
OEM-3
Stock ECU being replaced
APower ground
BPower ground
CPurge solenoid valve
E no data
FIgnition 1 (coils 1+4, wasted spark)
G no data
HMain relay
IIgnition 2 (coils 2+3, wasted spark)
JFront O2 heater
KEVAP leak detection pump
L no data
MAlternator control
N no data
PRear O2 heater
R no data
SImmobiliser
TVehicle speed
UCharge lamp
VCam position (CMP)
W–X no data
YCrank position (CKP)
Z no data
GND
KV12-C-29 Digital Input 3
KV12-C-30 Digital Input 4
VVT oil-control solenoid +12V feed
KV12-C-31 Digital Input 5
G no data
KV12-C-32 Digital Input 6
KV12-C-33 Digital Input 7
KV12-C-34 Digital Input 8
K no data
5V ref
KV12-D-11 Knock 1 +
KV12-C-8 Analog Input Channel 7
0V sensor
KV12-C-7 Analog Input Channel 6
Q no data
KV12-B-19 Auxiliary Output 10
KV12-D-15 Ignition Switch Input
U no data
KV12-C-4 Analog Input Channel 3
KV12-C-6 Analog Input Channel 5
KV12-C-2 Analog Input Channel 1
Y no data
KV12-C-5 Analog Input Channel 4
AB no data
KV12-C-9 Analog Input Channel 8
KV12-C-3 Analog Input Channel 2
ECU power +14V (main relay)
KV12-B-18 Auxiliary Output 9
OEM-4
Stock ECU being replaced
APower ground
BBrake switch
CPower steering pressure switch
DVVT oil-control solenoid +12V feed
FA/C request
G no data
HNeutral switch
IClutch switch
JVTCS vacuum switch
K no data
L+5V sensor supply
MKnock sensor
NIntake air temperature (IAT)
OSignal ground
PCoolant temperature (ECT)
Q no data
RVVT oil-control solenoid (low-side control)
SIgnition switch (IG1) sense
U no data
VThrottle position (TPS)
WFront O2 signal
XMass air flow (MAF)
Y no data
AARear O2 signal
AB no data
ADFuel level
AEPressure sensor (Mazda: EGR boost sensor)
AFECU power +14V (main relay)
AHEVAP leak detection pump solenoid valve
KV12
KV12-A
KV12
1Injection Channel 9
2Injection Channel 10
3Injection Channel 11
4Injection Channel 12
10Lambda 1 Heater -
11Lambda 2 Heater -
19ECU Ground
OEM-3-C Purge solenoid valve
OEM-3-K EVAP leak detection pump
OEM-3-M Alternator control
OEM-3-U Charge lamp
OEM-3-J Front O2 heater
OEM-3-P Rear O2 heater
GND
KV12-B
KV12
1Injection Channel 1
2Injection Channel 2
3Injection Channel 3
4Injection Channel 4
5Injection Channel 5
6Injection Channel 6
7Injection Channel 7
8Injection Channel 8
9ECU Ground
10Auxiliary Output 1
11Auxiliary Output 2
12Auxiliary Output 3
13Auxiliary Output 4
14Auxiliary Output 5
15Auxiliary Output 6
16Auxiliary Output 7
17Auxiliary Output 8
18Auxiliary Output 9
19Auxiliary Output 10
26Ignition Channel 1
27Ignition Channel 2
34ECU Ground
OEM-2-A Injector 1
OEM-2-D Injector 2
OEM-2-G Injector 3
OEM-2-J Injector 4
OEM-2-H EGR valve
OEM-2-I EGR valve
OEM-2-N VTCS solenoid (intake butterflies)
OEM-2-R Malfunction indicator lamp (MIL)
GND
OEM-2-O Fuel pump relay (non-immobiliser)
OEM-2-Q ISC valve low side
OEM-2-E EGR valve
OEM-2-F EGR valve
OEM-2-C Condenser fan relay
OEM-2-K A/C clutch relay
OEM-2-M Fuel pump relay
OEM-3-H Main relay
OEM-4-AH EVAP leak detection pump solenoid valve
OEM-4-R VVT oil-control solenoid (low-side control)
OEM-3-F Ignition 1 (coils 1+4, wasted spark)
OEM-3-I Ignition 2 (coils 2+3, wasted spark)
GND
KV12-C
KV12
1ECU Ground
2Analog Input Channel 1
3Analog Input Channel 2
4Analog Input Channel 3
5Analog Input Channel 4
6Analog Input Channel 5
7Analog Input Channel 6
8Analog Input Channel 7
9Analog Input Channel 8
17Analog Sensor 0V Reference
25Analog Sensor 0V Reference
26ECU Ground
27Digital Input 1
28Digital Input 2
29Digital Input 3
30Digital Input 4
31Digital Input 5
32Digital Input 6
33Digital Input 7
34Digital Input 8
GND
OEM-4-X Mass air flow (MAF)
OEM-4-AE Pressure sensor (Mazda: EGR boost sensor)
OEM-4-V Throttle position (TPS)
OEM-4-AA Rear O2 signal
OEM-4-W Front O2 signal
OEM-4-P Coolant temperature (ECT)
OEM-4-N Intake air temperature (IAT)
OEM-4-AD Fuel level
0V sensor
0V sensor
GND
OEM-3-T Vehicle speed
OEM-3-S Immobiliser
OEM-4-B Brake switch
OEM-4-C Power steering pressure switch
OEM-4-F A/C request
OEM-4-H Neutral switch
OEM-4-I Clutch switch
OEM-4-J VTCS vacuum switch
KV12-D
KV12
1ECU 14V Supply
2Auxiliary Output 13-16 14V Supply
4Crank Index Sensor +
5Crank Index Sensor -
6Sync Sensor +
7Sync Sensor -
9EFI Relay Output (Low Side 200mA)
11Knock 1 +
15Ignition Switch Input
20Auxiliary Output 9-12 14V Supply
21Sensor Supply Vref1: 5.0V
ECU 14V Supply
Auxiliary Output 13-16 14V Supply
OEM-3-Y Crank position (CKP)
OEM-4-O Signal ground (via SP-0V)
OEM-3-V Cam position (CMP)
OEM-4-O Signal ground (via SP-0V)
OEM-2-B Cooling fan relay
OEM-4-M Knock sensor
OEM-4-S Ignition switch (IG1) sense
Auxiliary Output 9-12 14V Supply
5V ref
SP-GND · 9 pins
SP-14V · 7 pins
SP-0V · 6 pins
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