Without Scan Tool

PRECAUTIONS FOR OPERATION
(1) When battery voltage is low, no detection of failure is possible. Be sure to check the battery for voltage and other conditions before starting the test.
(2) Diagnosis item is erased if the battery or the ECU connector is disconnected. Do not disconnect the battery before the diagnosis result is completely read.
(3) To diagnose the oxygen sensor, warm up engine and drive a good distance. Do not turn off the ignition switch after driving. If ignition switch is turned off, the result in memory is erased.
(4) After check and correction are over, disconnect ground cable for 10 seconds or more from negative terminal of battery and connect it again to make sure that failure code is erased.




INSPECTION PROCEDURE (Using Voltmeter)
(1) Connect an analogue voltmeter to the self-diagnosis connector.
(2) Turn ignition switch to ON, and indication of engine control unit memory contents will immediately start. If the system is in normal condition, pointer of the voltmeter constantly indicates 12V. If any abnormality is in memory, the pointer of the voltmeter will deflect, indicating abnormal item as described in "Diagnosis Chart". After recording the abnormal item, check and repair each part according to the check items in "Diagnosis Chart".
(3) After the defective parts have been repaired, disconnect the negative terminal of battery cable for 10 seconds or more and connect it again to make sure that the abnormal code has been erased.




DIAGNOSIS CHART