Service Manual — page 137 of 715

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FUEL SYSTEM (DFI) 3-47
Self-Diagnosis

Service    Parts or       Output Signal Usable
                                                                     Backups by ECU
Codes      Function          Range or Criteria
                        Crankshaft sensor must
           Crankshaft                                If the crankshaft sensor fails, the engine stops
  21                    send 22 signals to the ECU
             Sensor                                  by itself.
                        at the 1 cranking.
                        Rear wheel rotation sensor If the rear wheel rotation sensor system fails
          Rear Wheel
                        must send 45 signals to      (the signal is missing, wiring open), the ECU
  24        Rotation
                        the ECU at the 1 rotation of set the internal gear position value for the top
             Sensor
                        the wheel.                   (6th) and stops the KTRC.
                        Front wheel rotation sensor
          Front Wheel                                If the front wheel rotation sensor system fails
                        must send 48 signals to
  27        Rotation                                 (the signal is missing, wiring open), the ECU
                        the ECU at the 1 rotation of
             Sensor                                  stops the KTRC.
                        the wheel.
                                                     If the vehicle-down sensor system has failures
            Vehicle                                  (the output voltage is out of the usable range,
                        Output Voltage
  31         -down                                   wiring short or open), the ECU shuts off the
                        0.65 ∼ 4.45 V
             Sensor                                  fuel pump relay, the fuel injectors and the
                                                     ignition system.
                                                     If the subthrottle sensor system fails (the
                                                     output voltage is out of the usable range, wiring
           Subthrottle Output Voltage                short or open), the ECU drive the subthrottle
  32
             Sensor     0.15 ∼ 4.85 V                valve to the full closed position, and it stops
                                                     the current to the subthrottle valve actuator.
                                                     Then the ECU stops the KTRC.
                        The oxygen sensor is
                        active and sensor must       If the oxygen sensor is not activated, the ECU
            Oxygen
  33                    send signals (output         stops the feedback control with the oxygen
             Sensor
                        voltage) continuously to     sensor.
                        the ECU.
          Immobilizer
                                                     If the immobilizer system fails (no signal, wiring
            Amplifier
  35                                  –              short or open), the vehicle does not start, and
           (Equipped
                                                     does not run.
            Models)
                        The ignition key must use If the blank key or broken key is used, the
  36      Ignition Key
                        register key.                vehicle does not start the engine.
                        The communication error
  39          ECU       between the ECU and                                    –
                        meter unit
                                                     If the injector #1 fails (no signal, wiring short
                        The injector must send
          Fuel Injector                              or open), the ECU shuts off the signal to the
  41                    signals continuously to the
               #1*                                   injector. Fuel is not supplied to the cylinder #1,
                        ECU.
                                                     though the engine keeps running.
                                                     If the injector #2 fails (no signal, wiring short
                        The injector must send
          Fuel Injector                              or open), the ECU shuts off the signal to the
  42                    signals continuously to the
               #2*                                   injector. Fuel is not supplied to the cylinder #2,
                        ECU.
                                                     though the engine keeps running.
                                                     If the injector #3 fails (no signal, wiring short
                        The injector must send
          Fuel Injector                              or open), the ECU shuts off the signal to the
  43                    signals continuously to the
               #3*                                   injector. Fuel is not supplied to the cylinder #3,
                        ECU.
                                                     though the engine keeps running.