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)
KV12-C-27 Digital Input 1
KV12-B-15 Auxiliary Output 6
KV12-B-26 Ignition Channel 1
KV12-B-27 Ignition Channel 2
KV12-D-9 EFI Relay Output (Low Side 200mA)
KV12-C-28 Digital Input 2
KV12-C-29 Digital Input 3
KV12-C-30 Digital Input 4
KV12-B-14 Auxiliary Output 5
KV12-C-31 Digital Input 5
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
NWide-open throttle switch
PPower steering pressure switch
QA/C request
RA/C extra cooling fan relay
VNeutral/clutch switch
GND
GND
0V sensor
0V sensor
KV12-D-4 Crank Index Sensor +
F no data
KV12-D-6 Sync Sensor +
KV12-B-10 Auxiliary Output 1
5V ref
KV12-C-32 Digital Input 6
KV12-C-4 Analog Input Channel 3
KV12-C-5 Analog Input Channel 4
KV12-C-3 Analog Input Channel 2
KV12-C-6 Analog Input Channel 5
KV12-C-2 Analog Input Channel 1
KV12-B-1 Injection Channel 1
KV12-B-2 Injection Channel 2
KV12-B-16 Auxiliary Output 7
KV12-B-17 Auxiliary Output 8
KV12-B-3 Injection Channel 3
KV12-B-4 Injection Channel 4
OEM-2
Stock ECU being replaced
APower ground
BPower ground
CSensor ground (E2)
DSensor ground (E2)
ECrank position (CAS NE)
F no data
GCam position (CAS G)
ITachometer output
K+5V sensor supply
LIdle switch (TPS)
MTPS signal (A/T)
NO2 sensor
OAir flow meter (AFM)
PIntake air temperature (IAT)
QCoolant temperature (ECT)
UInjector 1 & 3 (batch)
VInjector 2 & 4 (batch)
WIdle speed control (ISC) valve
XPurge solenoid valve
YInjector 3 (California sequential)
ZInjector 4 (California sequential)
KV12
KV12-A
KV12
19ECU Ground
GND
KV12-B
KV12
1Injection Channel 1
2Injection Channel 2
3Injection Channel 3
4Injection Channel 4
9ECU Ground
10Auxiliary Output 1
14Auxiliary Output 5
15Auxiliary Output 6
16Auxiliary Output 7
17Auxiliary Output 8
26Ignition Channel 1
27Ignition Channel 2
34ECU Ground
OEM-2-U Injector 1 & 3 (batch)
OEM-2-V Injector 2 & 4 (batch)
OEM-2-Y Injector 3 (California sequential)
OEM-2-Z Injector 4 (California sequential)
GND
OEM-2-I Tachometer output
OEM-1-R A/C extra cooling fan relay
OEM-1-E Malfunction indicator lamp (MIL)
OEM-2-W Idle speed control (ISC) valve
OEM-2-X Purge solenoid valve
OEM-1-G Ignition 1 (coils 1+4, wasted spark)
OEM-1-H 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
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
GND
OEM-2-Q Coolant temperature (ECT)
OEM-2-O Air flow meter (AFM)
OEM-2-M TPS signal (A/T)
OEM-2-N O2 sensor
OEM-2-P Intake air temperature (IAT)
0V sensor
0V sensor
GND
OEM-1-C Start signal
OEM-1-N Wide-open throttle switch
OEM-1-P Power steering pressure switch
OEM-1-Q A/C request
OEM-1-V Neutral/clutch switch
OEM-2-L Idle switch (TPS)
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)
20Auxiliary Output 9-12 14V Supply
21Sensor Supply Vref1: 5.0V
ECU 14V Supply
Auxiliary Output 13-16 14V Supply
OEM-2-E Crank position (CAS NE)
SP-0V · 2 pins
OEM-2-G Cam position (CAS G)
SP-0V · 2 pins
OEM-1-J A/C relay
Auxiliary Output 9-12 14V Supply
5V ref
SP-GND · 8 pins
SP-0V · 7 pins
SP-14V · 5 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.
43 / 43 connections
Columns ▾
Lengths need a layout. Add bundles in Layout.
Not set yet: signal, colour, stripe, ident.
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