When the check-engine light comes on, locate the two-pin connector (service check connector) underneath the dash, making sure not to grab the three-pin connector (data link connector), which can be easily distinguished by its, well, three pins. The connectors are located behind the passenger-side kick panel. Jump the two terminals with a scrap piece of wire or paper clip and turn the ignition switch to the on position. As with the '88-'91 ECU, the MIL indicates codes by blink length and quantity, however, the MIL light on the gauge cluster blinks since OBD-I ECUs don't feature built-in ECU LEDs. Similar to the '88-'91 chassis, codes one through nine are indicated by individual short blinks while codes 10 through 48 are indicated by a series of long and short blinks. The number of long blinks equals the first digit while the number of short blinks equals the second.

THESE ARE THE OBD-1 CHECK ENGINE CODES


MIL


0
Engine Control Module (ECM/ECU)
1
Heated 02 sensor
3
Manifold Absolutre Pressure (MAP Sensor)
4
Crank Shaft Position Sensor (CKP Sensor)
6
Engine Coolant Temperature (ECT Sensor)
7
Throttle Position (TP sensor)
8
Top Dead Center Position (TDC sensor)
9
#1 Cylinder Position (CYP sensor)
10
Intake Air Temperature (IAT sensor)
13
Barometric Sensor (BARO sensor)
14
Idle Air Control Valve (IACV sensor)
15
Ignition Output Signal
16
Fuel Injector
17
Vehicle Speed Sensor (VSS sensor)
19
Lock Solenoid Valve (A/T trans)
20
Electrical Load Sensor (ELD sensor)
21
VTEC Solenoid (VTS)
22
VTEC Pressure Switch (VTPS sensor)
23
Knock Sensor (KS)
30
A/T FI Signal A

31
A/T FI Signal B

41
Heated 02 Sensor
43
Fuel Supply