Obd1 pinout of honda, gm, ford

Obd1 pinout of honda, gm, ford - ECU OBD1 diagram

1. Honda OBD1 ECU pinout
This part shows you the OBD1 ECU pinout (locations and wire colors) for all M/T ’92-95
Civic / ’92-95 Integra / ’92-95 Prelude VTEC and NON-VTEC vehicles.

Connector A

Pin number Pin name Description Wire color
1 INJ1 Injector 1 Brown
2 INJ4 Injector 4 Yellow
3 INJ2 Injector 2 Red
4 VTS VTEC solenoid Orange/White

2. Pin number Pin name Description Wire color
5 INJ3 Injector 3 Light blue
6 PO2SHTC Primary O2 sensor heater control
Civic VX D15Z1: HTCNTL (5-wire O2)
Orange/black
7 FLR Fuel pump relay Civic: Green/Yellow
Integra: Green/Blue
8 Empty slot -- --
9 IACV Idle air control valve Green/White
10 Empty slot -- --
11 EGR Exhaust gas recirculation solenoid valve
Civic SOHC or ysed for H22/H23 EGR
Red or Orange/Blue
12 FANC Radiator fan control Yellow/Green
13 MIL Malfunction indicator light Green/Orange
14 Empty slot -- --
15 ACC A/C compressor clutch Black/Red
16 ALTC Alternator control White/Green
17 IAB Intake air bypass
(Integra GSR B18C)
Pink
18 TCM Transmission control module
Empty slot for 5SPD Civic and Integra

19 ICS Intake control solenoid (H22A)
Empty slot for Civic and Integra
White
20 PCS Evap purge control solenoid valve Red
21 ICM Ignition control module Red/Green
22 ICM Ignition control module
Note: Depin this when using an OBD1 AEM EMS
Red/Green
23 PG1 Power ground Black

3. Pin number Pin name Description Wire color
24 PG2 Power ground Black
25 IGP2 Power source Yellow/Black
26 LG1 Logic ground Black/Red
Connector B

Pin number Pin name Description Wire color
1 IGP1 Power ground Yellow/Black
2 LG2 Logic ground Brown/Black
3 TCM Transmission control module
Empty slot for 5SPD Civic and Integra

4 TCM Transmission control module
Empty slot for 5SPD Civic and Integra

5 ACS A/C Switch signal Blue/Red
6 Empty slot -- --
7 M/T Clutch switch (Civic VX only)
Also used for A/T function
Pink/Black or Green (A/T)
8 PSPSW P/S power switch signal
Empty slot for Civic CX/DX/LX/EX/Si
Empty slot for Integra
Red/Green
9 STS Starter signal switch STS

4. Pin number Pin name Description Wire color
TMA/FAS Transmission related - Civic: Blue/White
- Integra: Blue/Red
TMA/FAS
- Civic: Grey
- Integra: Yellow
10 VSS Vehicle speed sensor Yellow or Blue/Orange
11 CYP P Cylinder position sensor side P (detection) Orange
12 CYP M Cylinder position sensor side M (ground) White
13 TDC P Top dead center sensor side PP(detection) Orange/Blue
14 TDC M Top dead center sensor side M (ground) White/Blue
15 CKP P Crankshaft position sensor side P (detection) Blue/Yellow
16 CKP M Crankshaft position sensor side M (ground) Blue/Yellow
Connector D

Pin
number
Pin name Description Color
1 VBU Voltage back up White/Blue or
White/Yellow
2 BKSW Brake switch Green/White
3 KS Knock sensor
Empty slot for Civic CX/DX/EX/Si
Red/Blue

5. Pin
number
Pin name Description Color
Civic VX D15Z1: LAF sensor (5-wire
O2)
4 SCS Service check signal Civic: Brown
Integra: Brown/White
5 Empty slot -- --
6 VTPS/VTM VTEC pressure switch Orange/Blue or Light blue
7 TXD/RXD Diagnostic data link Light blue or Light
green/Red
8 LAF sensor (5-wire O2) VS+ Only Civic VX D15Z1, others are empty --
9 ALT FR Alternator FR charge signal Pink or White/Red
10 EL (ELD) Electrical load detector Green/Red or Green/Black
11 TPS Throttle position sensor Light green or Red/black
12 EGRL EGR valve lift sensor (only Civic VX) White/Black
13 ECT Engine coolant temp sensor Red/white or Yellow/Blue
14 PHO2 Primary heated O2
Civic CX D15B8: 1-wire O2
Civic VX D15Z1: LAF sensor (5-wire
O2) IP+
White or White/Red
15 IAT Intake air temp Red/Yellow
16 LAF sensor (5-wire O2) IP-,
VS-
Only Civic VX D15Z1
Empty slot for the others
Blue/Green
17 MAP Manifold absolute pressure sensor Civic: White
Integra: White/Blue
18 Inter lock control unit (A/T related)
Civic CX/VX optional up-shift LT
Empty slot for the others
White/Red
Pink/Green
19 VCC1 Sensor voltage for MAP Civic: Yellow/Green
Integra: Red/white

6. Pin
number
Pin name Description Color
20 VCC2 Sensor voltage for TPS Yellow/White
21 SG1 Sensor ground 1 Civic: Green/Blue
Integra: Blue/White
22 SG2 Sensor ground 2 Green/White
Edit
GM OBD1 pinout

7. Ford OBD1 pinout

Pin number Description
1 Fuel pump enable output
2 Not used
3 Malfunction indictor lamp (MIL) output
4 K diagnostic line
Data +
5 Data -
6 L diagnostic line
Sensor signal return