| Service Codes | Parts | Output Signal Usable Range or Criteria | Backups by ECU |
| 11 | Main Throttle Sensor | Main Throttle Sensor Output Voltage 0.2-4.8 V | If the main throttle sensor system fails (the signal is out of the usable range, wiring short or open), the ECU locks ignition timing into the ignition timing at closed throttle position and sets the DFI in the D-J method. Also, the main throttle sensor system and inlet air pressure fails, the ECU locks ignition timing into the ignition timing at closed throttle position and sets the DFI in the a-N method. |
| 12 | Inlet Air Pressure Sensor | Inlet Air Pressure (absolute) Pv = 150-800 mmHg | If the inlet air pressure sensor system fails (the signal Pv is out of the usable range, wiring short or open), the ECU sets the DFI in the a - N·method. |
| 13 | Inlet Air Temperature Sensor | Inlet Air Temperature Ta = -30°C-+120°C | If the inlet air temperature sensor fails (the signal is out of the usable range, wiring short or open), the ECU sets Ta at 40°C. |
| 14 | Water Temperature Sensor | Water Temperature Tw = -30°C-+120°C | If the water temperature sensor system fails (the signal is out of the usable range, wiring short or open), the ECU sets Tw at 80°C. |
| 21 | Crankshaft Sensor | Crankshaft sensor must send 22 signals (output signal) to the ECU at the one cranking. | If crankshaft sensor generates other than 22 signals, the engine stops by itself. |
| 24 and 25 | Speed Sensor | Speed sensor must send 4 signals (output signal) to the ECU at the one rotation of the engine sprocket. The gear position is decided by the signal of the speed sensor. | If the speed sensor system fails (no signal, wiring short or open), the speedometer shows 0, and the ECU sets the top (6) gear position. |
| 31 | Vehicle-down Sensor | Vehicle-down Sensor Output Voltage (signal) Vd = 0.65-4.45 V | If the vehicle-down sensor system has failures (the output voltage Vd is more than usable range, wiring open), the ECU shuts off the fuel pump, the fuel injectors and the ignition system. |
| 32 | Subthrottle Sensor | Subthrottle Sensor Output Voltage 0.15-4.85 V | If the subthrottle sensor system fails (the signal is out of the usable range, wiring short or open), the ECU drive the subthrottle valve to the full closed position, and it stops the current to the actuator. |
| 33 | Oxygen Sensor (Europe Models) | The oxygen sensor is active and sensor must send signals (output voltage) continuously to the ECU. | If the oxygen sensor is not activated, the ECU stops oxygen sensor feedback mode. |
| 51 | Stick Coil #1 (Ignition Coil)* | The stick coil primary winding must send signals (output voltage) continuously to the ECU. | If the ignition primary winding #1 has failures (no signal, wiring short or open), the ECU shuts off the injector #1 to stop fuel to the cylinder #1, though the engine keeps running. |
| 52 | Stick Coil #2 (Ignition Coil)* | The stick coil primary winding must send signals (output voltage) continuously to the ECU. | If the ignition primary winding #2 has failures (no signal, wiring short or open), the ECU shuts off the injector #2 to stop fuel to the cylinder #2, though the engine keeps running. |
| 62 | Subthrottle Valve Actuator | The actuator operates open and close of the subthrottle valve by the pulse signal from the ECU. | If the subthrottle valve actuator fails (the signal is out of the usable range, wiring short or open), the ECU stops the current to the actuator. |
| 67 | Oxygen Sensor (Europe Models) | The oxygen sensor heater raise temperature of the sensor for its earlier activation. 12V-6.6W, 0.55A | If the oxygen sensor heater fails (wiring short or open), the ECU stops the current to the heater. |
| 94 | Oxygen Sensor (Europe Models) | The oxygen sensor must send signals (output voltage) continuously to the ECU | If the oxygen sensor output voltage is incorrect, the ECU stops oxygen sensor feed back mode. |
Note: (1) D-J Method and a - N Method: When the engine load is light like at idling or low speed, the ECU determines the injection quantity by calculating from the throttle vacuum (inlet air pressure sensor output voltage) and engine speed (crankshaft sensor output voltage). This method is called D-J method (low-speed mode). As the engine speed increases, and the engine load turns middle to heavy, the ECU determines the injection quantity by calculating from the throttle opening (throttle sensor output voltage) and the engine speed. This method is called a - N·method (high-speed mode). (*) This depends on the number of stopped cylinders.