Diagnostic Test Mode II
In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL. The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test mode I, all displayed items are 1st trip DTCs. If only one flash code is displayed when the MIL illuminates in diagnostic test mode II, it is a DTC; if two or more flash codes are displayed, they may be either DTCs or 1st trip DTCs. DTC number is same as that of 1st trip DTC. These unidentified codes can be identified by using a scan tool. A DTC will be used as an example for how to read a code. See Fig 1.
A particular flash code can be identified by the number of four-digit numeral flashes. Zero is indicated by ten flashes. The length of time the 1000th-digit numeral flashes on and off is 1.2 seconds, consisting of a 0.6-second on and 0.6-second off cycle. The 100th-digit numeral and lower digit numerals consist of a 0.3-second on and 0.3-second off cycle. A change from one digit numeral to another occurs at an interval of 1.0-second off. In other words, the later numeral appears on the display 1.3 seconds after the former numeral has disappeared. A change from one trouble code to another occurs at an interval of 1.8-seconds off. In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no malfunction.