Mazda 2006 MX-5 Service Highlights page 39

P2188 Fuel system too rich at idle
• PCM monitors short term fuel trim (SHRTFT), long term fuel trim (LONGFT) during closed loop fuel control at
idle. If the LONGFT and the sum total of these fuel trims exceed preprogrammed criteria. PCM determines that
fuel system is too rich at idle.
P2195 Front HO2S signal stuck lean
• The PCM monitors the front HO2S output current when the following conditions are met. If the average output
current is more than 1.2 A for 25 s, the PCM determines that the front HO2S signal remains lean.
MONITORING CONDITION
— ECT: more than 70 °C {158 °F}
— Engine speed: 1,000—3,200 rpm
— MAF amount: 6—80 g/s {0.80—10.58 lb/min}
— Target A/F feedback system status: feedback control
— Output voltage from the middle HO2S: more than 0.2 V
P2196 Front HO2S signal stuck rich
• The PCM monitors the front HO2S output current when the following conditions are met. If the average output
current is less than 0.85 A for 25 s, the PCM determines that the front HO2S signal remains rich.
MONITORING CONDITION
— ECT: more than 70 °C {158 °F}
— Engine speed: 1,000—3,200 rpm
— MAF amount: 6—80 g/s {0.80—10.58 lb/min}
— Target A/F feedback system status: feedback control
— Output voltage from the middle HO2S: less than 0.7 V
P2228 BARO sensor circuit low input
• PCM monitors input voltage from BARO sensor. If input voltage is below 2.1 V, PCM determines that BARO
sensor circuit has malfunction.
P2229 BARO sensor circuit high input
• PCM monitors input voltage from BARO sensor. If input voltage is above 4.0 V, PCM determines that BARO
sensor circuit has malfunction.
P2401 EVAP system leak detection pump motor circuit low
• The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. If the
pump load current is lower than specified, the PCM determines EVAP system leak detection pump motor circuit
has a malfunction.
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
ON-BOARD DIAGNOSTIC
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