![]() IMAP-delta = EGR-ON IMAP - EGR-OFF IMAP (inferred MAP).MAP-delta = EGR-ON MAP - EGR-OFF MAP (analog MAP).Next, the differences between the EGR-ON and EGR-OFF values are calculated: After all the samples have been taken, the average EGR-ON MAP, EGR-ON IMAP, EGR-OFF MAP and EGR-OFF IMAP values are stored. Typically, seven such ON/OFF samples are taken. The value of EGR-OFF IMAP is also recorded. Again, the value of MAP is recorded (EGR-OFF MAP). The value of inferred MAP EGR-ON IMAP is also recorded. At this time, the value of MAP is recorded (EGR-ON MAP). When the flow test entry conditions have been satisfied, EGR is commanded to flow at a calibrated test rate (about 10%). If the EGR system is working properly, there is a significant difference in both the observed and the calculated values of MAP, between the EGR-ON and the EGR-OFF states. During normal, steady-state operating conditions, EGR is intrusively commanded ON to a specified percentage. The EGR flow test is done by observing the behavior of two different values of MAP - the analog MAP sensor reading, and inferred MAP (MAP calculated from the Mass Air Flow Sensor, throttle position, rpm, etc.). If a malfunction is detected, the EGR system as well as the EGR monitor is disabled until the next engine startup. The flow test is performed once per drive-cycle when a minimum amount of EGR is requested and the remaining entry conditions required to initiate the test are satisfied. Additional monitoring will be suspended for the remainder of the driving cycle, or until the next engine startup.Īfter the vehicle has warmed up and normal EGR rates are being commanded by the PCM, the EGR flow check is performed. If a malfunction has been detected, the EGR system will be disabled, setting the KOER, and Cont. A malfunction is indicated if an open circuit, short to power, or short to ground has occurred in one or more of the stepper motor coils / circuits for a calibrated period of time. The stepper motor electrical test is a continuous check of the four electric stepper motor coils and circuits to the PCM. The PCM controls the EGR valve by commanding from 0 to 52 discreet increments or "steps" to get the valve from fully closed to fully open. The Stepper Motor EGR Monitor consists of an electrical and functional test that checks the stepper motor and the EGR system for proper flow. Some of the EGR System Monitor tests are also performed during on demand self-test Once activated, the EGR System Monitor will perform each of the tests described below during the engine modes and conditions indicated. Input from the ECT or CHT, IAT, TP, CPS, MAF, and MAP sensors is required to activate the EGR System Monitor. ![]() The monitor is activated during EGR system operation and after certain base engine conditions are satisfied. The Electric EGR System Monitor is an on-board strategy designed to test the integrity and flow characteristics of the EGR system. Vehicle » Powertrain Management » Computers and Control Systems » Testing and Inspection » Monitors, Trips, Drive Cycles and Readiness Codes » Electric Exhaust Gas Recirculation (EEGR) System MonitorĮlectric Exhaust Gas Recirculation (EEGR) System Monitor ![]()
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