Mitsubishi Eclipse II technical information manual page 53

text version of content this owner's manual page from owners manual to the vehicle Mitsubishi Eclipse, year of production 1995 - 1999:

1-32 ENGINE - Control System In addition to illuminating the MIL lamp, a diagnosticthe PCM’s software to determine not only if these trouble code (DTC) is stored in the Powertrain Con- specific systems are operating, but if they are operat- trol Module (PCM) and can be retrieved by a service technician using a diagnostic scan tool. ing within pre-established limits. While OBD I testsL) measure a component’s electrical operation, OBD II monitors check a system’s performance. To meet OBD-II requirements the following systems must be monitored: The California Air Resources Board (CARB) moni- 0 Catalyst tors emission system repairs from several California l Fuel System dealers. If a specific component or system fails on l Misfire more than 4% of the vehicles sampled, the manufac- l Oxygen Sensor and Oxygen Sensor Heater turer is required to research and evaluate the rea- l Secondary Air sons. If the failure is not attributable to owner negli- l Evaporative System (Purge) gence or misuse, a component failure rate of 4% l Exhaust Gas Recirculation could lead to vehicle recalls. The federal government is considering a similar program. The manufacturer l Any other input or output component that can affect emissions is relying on its technicians throughout the country to appropriately diagnose emissions concerns and The operating conditions of the components can replace only those parts that have failed. The sloppy be monitored using MUT-II scan tool, as well as practice of “hanging” parts on a car under emissions general purpose scan tools. The OBD II system warranty could lead to an unnecessary (and expen- monitors are different. They are checks made by sive) fleet-wide recall. DIAGNOSTIC SYSTEM OPERATION Trip Indicator N71AK33AA “Trip” is a difficult concept to define because the requirements for a trip vary depending on the test allow the system to double check itself and help prevent unnecessary MIL illumination. being run. These conditions can include seemingly If the conditions to run the test are not met on consec- unrelated items such as driving style, length of trip, utive key cycles, the information from the first test’ and ambient temperature. The minimum require- L) is not lost. The diagnostic system waits until the ment for a trip is that it includes one key cycle with the vehicle having to meet certain enabling condi- next time the appropriate test conditions occur and continues the count. tions before a test is performed. Vehicle tests vary If this is a “two trip fault” and the test failed the in length and may be performed only once per trip first time, a malfunction the second consecutive or may be performed continuously. If the pertinent time the test is run (even if there were ten key enabling conditions are not met during that key cycle, the tests may not run at all. cycles between these tests) will illuminate the MIL. NOTE If the malfunction does not occur the second time the test is run, the MIL lamp does not illuminate In California and other states requiring the PCM to indicate that all monitors have passed before and no DTC is recorded. The diagnostic system can turn the MIL off if it re- issuing license plates, removing the vehicle’s battery or using the MUT-II scan tool to erase DTC’s before cords three consecutive trips where the system passes the test. However, with the misfire and fuel testing erases any record of passing a monitor. If monitors, the system must past the test under the the monitor does not complete a trip on subsequent same circumstances (within 375 rpm) under which key cycles, the vehicle will fail a licensing test. What constitutes a trip for a particular OBD test it failed the test. In summary, it is the diagnostic system’s job to deter- is important because in many instances, the vehicle must fail a test on more than once before the MIL mine if the conditions are appropriate for a test to be run, know the definition of a trip for each is illuminated and a DTC is recorded. Tests that test, and record the results of each test when it illuminate the MIL when a single failure is recorded are known as “one trip” monitors. “Two trip” monitorsis run.

owners manual Mitsubishi Eclipse

owners manual Mitsubishi Eclipse - year of production: 1995, 1996, 1997, 1998, 1999 - Mitsubishi Eclipse II technical information manual EN