OBD0 ECU A (18 Pin) C451 |
Pin |
Wire Color |
Terminal Name |
Description |
Test |
1 |
BRN |
INJ1 |
Injector 1 + |
1.5V - 2.5 Ohms |
2 |
BLK |
PG1 |
Power Ground (Main Relay), A4 |
|
3 |
RED |
INJ2 |
Injector 2 + |
1.5V - 2.5 Ohms |
4 |
BLK |
PG2 |
Power Ground (Main Relay), A2 |
|
5 |
LT BLU |
INJ3 |
Injector 3 + |
1.5V - 2.5 Ohms |
6 |
BLU |
PCS |
Purge Control Solenoid |
Coolant Temp > 154F: 12V when activated |
7 |
YEL |
INJ4 |
Injector 4 + |
1.5V - 2.5 Ohms |
8 |
RED |
EGR |
Exhaust Gas Recycling Control Solenoid Valve |
'88-91 Civic, '90-91 Integra Automatic |
8 |
GRN/WHT |
VTS |
(VTEC) Spool Control Solenoid |
|
10 |
GRN |
|
Pressure Regulator Cut-off Solenoid |
|
11 |
BLU/YEL |
IACV (EACV)) |
Idle Air Control Valve |
12V to A2, Unplugged 8-15 Ohms |
12 |
GRN/BLK |
FLR1 |
Main Relay 8 |
|
13 |
YEL/BLK |
IGP1 |
Injector resistor pack and Main Relay Power |
Main Relay 3 |
14 |
GRN/BLK |
FLR2 |
Main Relay 8 |
redundant |
15 |
YEL/BLK |
IGP2 |
Injector resistor pack and Main Relay Power |
redundant |
16 |
BRN/BLK |
LG2 |
Logic Ground |
Less than 1V at all times |
17 |
BLK/YEL |
EACV (IACV) |
Idle Air Control Valve |
Dash fuse #14 |
18 |
BLK/RED |
LG1 |
Logic Ground |
Less than 1V at all times |
OBD0 ECU B (20 Pin) C452 |
Pin |
Wire Color |
Terminal Name |
Description |
Test |
1 |
WHT/GRN |
VBU |
Voltage Backup |
Hazard Fuse under hood |
2 |
BLU/YEL (Integra) |
TCS |
Tandem Control Solenoid (Fast Idle) |
|
2 |
BLU (Civic) |
DSCV |
Dashpot Control Solenoid Valve |
|
3 |
YEL |
ACC |
AC Clutch Relay |
Connect to A18, clutch should click |
4 |
YEL/GRN (Integra) |
FANC |
Radiator Fan Control |
Fan Running: 0V |
4 |
GRN (Civic) |
PCS |
Purge Cut-off Solenoid Valve |
|
4 |
BLU/WHT |
A/T Control Unit |
Automatic |
Integra |
5 |
WHT/YEL |
ALT C |
Alternator Control |
12 - 0V |
5 |
BLU/BLK |
VTM |
VTEC Pressure Switch (B16) |
|
6 |
GRN/ORN |
MIL |
Malfunction Indicator Light |
CEL On when grounded |
7 |
BLU/WHT |
ATSP |
A/T Shift Position Signal |
5V to A18 |
8 |
BLU/RED |
ACS + |
AC Switch |
5V to A18 |
10 |
ORN |
CKP P |
Crank Position + (Distributor) |
Resistance to C12 350-700 Ohms |
11 |
BLK/GRN |
|
Rear Defogger Switch (B16) |
|
12 |
WHT |
CKP M |
Crank Position - (Distributor) |
|
13 |
BLU/WHT |
STS |
Starter Switch Signal to Main Relay 4 |
Engine cranking: 12V |
14 |
BLU |
ALT FR |
Alternator Charging Signal |
5V to A18 |
15 |
WHT |
ICM1 |
Ignition Control Module |
10V to A18 |
16 |
YEL/RED |
VSS |
Vehicle Speed Sensor (Gauge cluster) |
Ignition on, Front wheels rotating: 0 - 5V cycles |
17 |
WHT |
ICM2 |
Ignition Control Module |
redundant |
19 |
RED/BLU |
KS |
Knock Sensor |
|
19 |
RED |
PSP SW |
Power Steering Pressure Switch |
Turn steering wheel, 12V to A18 |
19 |
GRN/RED |
ELD |
Electric Load Detector |
|
20 |
BRN |
Service Check Signal (SCS) |
Enables Diagnostic mode |
Jumpered for Ignition Timing Adjustment |
OBD0 ECU C (16 Pin) C453 |
Pin |
Wire Color |
Terminal Name |
Description |
Test |
1 |
BLU/GRN |
CYP P |
Cylinder Position + (Distributor) |
Resistance to C2 350-700 Ohms |
2 |
BLU/YEL |
CYP M |
Cylinder Position - (Distributor) |
|
3 |
ORN/BLU |
TDC P |
Top Dead Center + (Distributor) |
Resistance to C4 350-700 Ohms |
4 |
WHT/BLU |
TDC M |
Top Dead Center - (Distributor) |
|
5 |
RED/YEL |
IAT (TA) |
Intake Air Temperature |
5V, Sensor resistance (unplugged) 1-4k Ohms |
6 |
RED/WHT |
ECT (TW) |
Engine Coolant Temperature |
5V, Sensor resistance (unplugged) 200-400 Ohm |
7 |
RED/BLU |
TPS |
Throttle Position Sensor |
Fully Open: 4.5V,
Closed: .3V |
8 |
RED/BLU |
SO2S |
2nd Oxygen Sensor (B16) |
|
9 |
RED/WHT |
PA Sensor |
Atmospheric Pressure (Barometric) Signal |
5V |
10 |
GRN/WHT |
BKSW |
Brake Switch signal + |
Brake pressed: 12V |
11 |
WHT |
MAP + |
Manifold Absolute Pressure |
3V |
12 |
GRN/WHT |
SG2 |
Sensor Ground (TPS, IAT) |
5V - |
13 |
YEL/WHT |
VCC2 |
Sensor Voltage (TPS / PA Sensor) |
5V + |
14 |
GRN/WHT |
SG1 |
Sensor Ground (MAP) |
5V - |
15 |
YEL/RED |
VCC1 |
Sensor Voltage (MAP) |
5V + |
16 |
WHT |
PO2S |
Primary Oxygen Sensor |
|