Mitsubishi Eclipse II technical information manual page 99

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

1-78 ENGINE - Control System DIAGNOSTIC SYSTEM DESCRIPTION OF OBD-II SYSTEM N716K7OAA ii The engine control module (ECM) monitors its input/ is memorized. In this case, send the diagnostic output signals. Some signals are monitored all the trouble code erase signal from the scan tool to the time, and others only under specified conditions. When an irregularity has continued for a specified engine control module and the diagnostic memory will be erased. time from when the irregular signal is initially moni- The 35 diagnostic items are provided as follows, tored, the engine control module judges that a fault has occurred. and if plural items are activated, they are all indicated sequentially from the smallest code number. After detecting a fault, the engine control module NOTE stores its diagnostic trouble code in memory when it re-detects the same fault in an operation following The diagnostic trouble code of ignition timing adjust- the next engine startup. ment signal is outputted when terminal for ignition timing adjustment is grounded. Therefore, it is not In regard to the items marked*, however, the engine abnormal that the code is outputted even when ter- control module stores the diagnostic trouble code of any of them the first time the module detectsminal for ignition timing adjustment is grounded for it. ignition timing adjustment. There are 35 diagnostic items, and the diagnostic The engine control module stores in memory not only the diagnostic trouble code of a fault but also results can be read out with a scan tool. Moreover, since memorization of the diagnostic the intra-module RAM data on the engine operating trouble codes is backed up directly by the battery, conditions that existed when it detected the fault. (The data is called freeze frame data.) the diagnostic results are memorized even if the ignition key is turned off. The diagnostic trouble The data shows the engine operating conditions that existed when the engine control module de- codes will, however, be erased when the battery tected the fault as well as those that existed when terminal or the engine control module connector is disconnected. the module did not detect any fault. However, when the engine control module detects In addition, the diagnostic trouble code can be also a misfiring or fuel trim malfunction, it clears the be erased by turning the ignition switch to ON and d existing data and stores the new data. sending the diagnostic trouble code erase signal The data can be read by a scan tool and can be from the scan tool to the engine control module. conveniently used in performing fault repetition tests NOTE for troubleshooting. The data items to be stored in memory are shown If the sensor connector is disconnected with the ignition switch turned on, the diagnostic trouble codebelow. Data item Unit Engine coolant temperature “C Engine speed r/min. Vehicle speed km/h Long term fuel trim % Short term fuel trim % Fuel control state 0 Open loop l Closed loop l Open loop - drive condition l Open loop - DTC set l Closed loop - 02 (rear) trouble Calculated load value % - Diagnostic trouble code associated with the data in memory

owners manual Mitsubishi Eclipse

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