KOEO/KOER SELF-TEST [L8, LF]

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• The self test function consists of the KOEO (Key On Engine Off) self test, performed when the ignition switch is turned to the ON position and the engine is stopped; and the KOER (Key On Engine Running) self test, performed when idling. If a malfunction is detected when either self test is executed, a DTC is displayed on the Mazda Modular Diagnostic System (M-MDS). Using the self test function, the present malfunction or a successful repair is readily confirmed. Refer to the self test function table for the corresponding DTCs.

KOEO (Key ON, Engine Off) Self test

• The KOEO self test is a powertrain control system self-diagnosis, performed when the ignition switch is turned to the ON position and the engine is stopped. A KOEO self test begins when the connected Mazda Modular Diagnostic System (M-MDS) sends an execute command to the PCM.
• As the KOEO self test is performed, the PCM performs the inspection for set DTCs and if a malfunction is detected the DTC is displayed on the Mazda Modular Diagnostic System (M-MDS).

KOER (Key ON, Engine Running) Self test

• The KOER self test is a powertrain control system self-diagnosis, performed when the ignition switch is turned to the ON position and the engine is idling. A KOER self test begins when the connected Mazda Modular Diagnostic System (M-MDS) sends an execute command to the PCM.
• As the KOER self test is performed, the PCM performs the inspection for set DTCs and if a malfunction is detected the DTC is displayed on the Mazda Modular Diagnostic System (M-MDS).