| Circuit Diagram |

Signal Waveform
Inspection 1. Turn the ignition switch OFF. 2. Disconnect the HO2S connector. 3. Measure resistance between the HO2S terminals 1 and 2. 4.
Replacement 1. Discharge refrigerant from refrigeration system. 2. Replace any faulty tubes or hoses. Cap the open fittings immediately to keep moisture or dirt out of the system. 3. Tighten the bolt or nut joint to the specified torque.
Inspection 1. Press the MODE switch more than 4 times within 2 seconds while pressing the OFF switch. DisplayFail description00Normal51Cluster ion generator fault * For diagnostic procedure, refer to DTC guide. Replacement 1. Disconnect the negative (-) battery terminal.