Koeo/Koer Self-Test[Lf]; Koeo (Key On, Engine Off) Self-Test; Koer (Key On, Engine Running) Self-Test - Mazda 3 2007 Service Highlights

P2402 EVAP system leak detection pump motor circuit high
• The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. If the
pump load current is higher than specified, the PCM determines EVAP system leak detection pump motor
circuit has a malfunction.
P2404 EVAP system leak detection pump sense circuit problem
• The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. After
obtaining the reference current value, if the time in which the pump load current reaches the reference current
value is less than the specification, the PCM determines air filter has a malfunction.
P2405 EVAP system leak detection pump sense circuit low input
• The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. If the
current is lower than the specification while the PCM obtains the reference current value, the PCM determines
EVAP system leak detection pump orifice has a malfunction.
P2407 EVAP system leak detection pump sense circuit intermittent
• The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. When
either of the following is detected 6 times or more successively, the PCM determines EVAP system leak
detection pump heater has a malfunction:
— While obtaining the reference current value, the change in pump load current exceeds the specification.
— After obtaining the reference current value, the pump load current is kept lower than the maximum pump
load current for more than the specified time.
P2502 Charging system voltage problem
• PCM judges generator output voltage is above 17 V or battery voltage is below 11 V during engine running.
P2503 Charging system voltage low
• PCM needs more than 20 A from generator, and judges generator output voltage to be below 8.5 V during
engine running.
P2504 Charging system voltage high
• PCM judges generator output voltage is above 18.5 V or battery voltage is above 16.0 V during engine
running.
P2507 PCM B+ voltage low
• The PCM monitors the voltage of back-up battery positive terminal. If the PCM detects battery positive terminal
voltage below 2.5 V for 2 s, the PCM determines that the backup voltage circuit has a malfunction.
P2610 PCM internal engine off timer performance
• PCM internal engine off timer is damaged.
End Of Sie

KOEO/KOER SELF-TEST[LF]

• 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).
ON-BOARD DIAGNOSTIC [LF]
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