Diagnostic Trouble Codes - 1990
Hyundai
| 11 | Oxygen Sensor |
| 12 | Air Flow Sensor |
| 13 | Air Temperature Sensor |
| 14 | Throttle Position Sensor |
| 15 | Motor Position Sensor |
| 21 | Engine Coolant Temperature Sensor |
| 22 | Crank Angle Sensor |
| 23 | No. 1 Cylinder TDC Sensor |
| 24 | Vehicle Speed Sensor |
| 25 | Barometric Pressure Sensor |
| 41 | Injector |
| 42 | Fuel Pump |
| 43 | EGR (California Only) |
Extracting fault codes:
- Turn the ignition key "OFF".
- Connect the voltmeter to the self diagnosis connector.
- Turn the ignition key on and note the indication of the voltmeter. If the voltmeter indicates a steady 12 vdc the ECU has failed. If the voltmeter fluctuates, note the position and width of pulses and compare the pattern to the ECU codes chart to determine the error code.
- After the cause of a failure code has been detected and corrected the diagnostic code memory of the ECU should be cleared by disconnecting the vehicle battery for 15 seconds or more.
NOTE: Do not disconnect the vehicle battery while the engine is running or while the ignition is on.
NOTE: In the event of a recurring check engine light accompanied by an oxygen sensor fault code, the probable cause is a poor alternator to engine ground, and excessive resistance in the battery ground circuit.
NOTE: There may be more than one error code stored in the ECU memory. If so they will be displayed in ascending order with a two second pause between each code. Also, the oxygen sensor code is erased when the ignition is turned off. To test for oxygen sensor codes drive the vehicle a significant distance and check for diagnostic codes before turning the ignition off.
