Jul 11 2008

OBD1 Honda/Acura ECU Pinouts

Published by Benjamin Jones at 10:22 am under Tech Info

KOEO = Key on; Engine OFF
KOER = Key on; Engine Running

Pin
Function
Color
Voltage
A1
INJ1
Brown
Battery Voltage with KOEO
A2
INJ4
Yellow
Battery Voltage with KOEO
A3
INJ2
Red
Battery Voltage with KOEO
A4
VTS – VTEC Solenoid
Green/Yellow
N/A
A5
INJ3
Blue
Battery Voltage with KOEO
A6
PO2SHTC – O2 Sensor Heating Element
Orange/White
Battery Voltage with KOEO
A7
FLR1- Fuel Pump
Green/Black
Battery Voltage with KOEO
A8
Empty
-
-
A9
IACV
Black/Blue
10V KOEO with warm engine
A10
Empty
-
-
A11
EGR
Red
N/A
A12
FANC – Engine Coolant Temp. Switch
Blue/Red
N/A
A13
CEL
Blue/White
N/A
A14
Empty
-
-
A15
ACC – A/C Clutch
Red/Blue
N/A
A16
ALT C – Alternator
White/Green
N/A
A17
IAB – IAB Solenoid
Pink
N/A
A18
Auto Lock Up Solenoid
Orange/Red
N/A
A19
Intake Control Solenoid
White
Battery Voltage with KOEO
A20
PCS EVAP Purge Control Solenoid
Red/Green
N/A
A21
ICM – Ignition Control Module
Yellow/Green
10V KOEO
A22
Ignitor “
A23
PG1 – Ground
Black
< 1V
A24
PG2 – Ground
A25
IGP2 – Battery Positive to Main Relay
Yellow/Black
Battery Voltage with KOEO
A26
LG1 – Ground
Black/Red
<1V
B1
IGP2 – To A25
Yellow/Black
Battery Voltage with KOEO
B2
LG2 – Ground/Shields for CYP/TDC
Brown/Black
<1V
B3
Upshift/Downshift
Orange
N/A
B4
Pink
N/A
B5
ACS – A/C Switch
Blue/Black
5V = KOEO/A/C Off; <1V KOER/A/C On
B6
Empty
-
-
B7
Park/Neutral Switch
Light Green
<1V KOEO; 5V KOER
B8
PSPSW – Power Steering Pressure Switch
Red/Green
0V KOEO; Battery Voltage KOER while turning
B9
Starter Signal
Blue/Red
Battery Voltage when in Start Position
B10
VSS – Vehicle Speed Sensor
Orange
Pulses 0-12V while spinning front-left wheel
B11
CYP P
Orange
CYP Sensor Input
B12
CYP M
White
CYP Sensor Signal
B13
TDC P
Orange/Blue
TDC Sensor Input
B14
TDC M
White/Green
TDC Sensor Signal
B15
CKP P
Blue/Green
CKP Sensor Input
B16
CKP M
Blue/Yellow
CKP Sensor Signal
D1
VBU – Back Up Power
White/Yellow
Battery Voltage at All Times
D2
BKSW – Brake Switch
Green/White
Battery Voltage at All Times
D3
KS – Knock Sensor
Red/Blue
N/A
D4
SCS – Service Check Connector
Brown/White
Manual 5V; Auto 11V
D5
Empty
-
-
D6
VTM – VTEC Pressure Switch
Light Blue
N/A
D7
TXD/RXD – Data Link Connector
Light Green/Red
N/A
D8
Empty
-
-
D9
ALT F – Alternator
White/Red
4.5V KOEO; Decreases Under Electrical Load
D10
ELD – Electrical Load Detector
Green/Black
N/A
D11
TPS
Red/Black
0.5V Closed; 4.5V Wide Open
D12
EGR Valve Lift Sensor
White/Black
1.2V KOEO
D13
ECT – ECT Sensor Input
Yellow/Blue
5V KOEO
D14
PHO2S – O2 Sensor Heater
White
0.4-0.5V Cold; 0.1V Warm
D15
IAT
Red/Yellow
0.05-4.5V Depending on Temperature
D16
VREF
-
-
D17
MAP
White/Blue
3V KOEO
D18
Transmission Control Module (Auto)
Light Green/Black
N/A
D19
Reference Voltage
Red/White
5V KOEO
D20
Reference Voltage
Yellow/White
5V KOEO
D21
Sensor Ground
Blue/White
<1V
D22
Sensor Ground
Green/White
<1V

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