Retrieving Codes
Locate ECU and check for trouble codes. See ELECTRONIC CONTROL UNIT (ECU) LOCATION table. Pull down ECU inspection window located under passenger's front seat (on Legend Sedan). Turn ignition on and observe Red LED on top of ECU. LED indicates a system failure code by number of blinks.
The LED indicates component problems with a blinking series of codes. Trouble codes 1-9 are indicated by individual short blinks. Codes 10-43 are indicated by a series of long and short blinks. One long blink equals 10 short blinks. Add long and short blinks together to determine trouble code.
If codes other than those listed are indicated, substitute a known good ECU and recheck. If codes do not reappear, replace original ECU. It is possible for CHECK ENGINE light and Red LED to come on indicating a system problem, when in fact there is a poor or intermittent connection. Check all related connections and repair as necessary. Whenever CHECK ENGINE light comes on and Red LED stays on steady, replace ECU.
| Application | Location |
|---|---|
| Legend Coupe | Below Carpet Under Passenger's Side of Dash |
| Legend Sedan | Under Passenger's Front Seat |
| Code | System Affected | Probable Cause | ||
|---|---|---|---|---|
| 0 | ECU | No Signal To ECU | ||
| 1 | Oxygen Sensor (Front) | Open/Shorted Signal Circuit | ||
| 2 | Oxygen Sensor (Rear) | Open/Shorted Signal Circuit | ||
| 3 | MAP Sensor | MAP Sensor Electrical Problem | ||
| 4 | Crank Angle Sensor | Sensor Circuit Problem | ||
| 5 | MAP Sensor | MAP Sensor Mechanical Problem | ||
| 6 | Coolant Temp. Sensor (TW) | Open/Shorted Signal Circuit | ||
| 7 | Throttle Angle Sensor | Open/Shorted Signal Circuit | ||
| 8 | TDC Position Sensor | Problem in TDC Sensor Circuit | ||
| 9 | No. 1 Cyl. Position | Problem in CYL Sensor Circuit | ||
| 10 | Intake Air Temperature | Open/Shorted Signal Circuit | ||
| 12 | EGR System (Calif. A/T & Hi. Alt.) | No EGR Action | ||
| 13 | Atmospheric Pressure | Open/Shorted Signal Circuit | ||
| 14 | Elec. Air Control Valve (EACV) | EACV Circuit Problem | ||
| 15 | Ignition Output Signal | Open/Shorted Signal Circuit | ||
| 17 | Vehicle Speed Sensor (VSS) | No VSS Signal | ||
| 18 | Ign. Timing Adjustment | Open/Shorted Signal Circuit | ||
| 30 | A/T FI Signal A | Open/Shorted Signal Circuit | ||
| 31 | A/T FI Signal B | Open/Shorted Signal Circuit | ||
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