ON-BOARD DIAGNOSTIC [LF]
01-02–13
Mazda MX-5
P0455 Evaporative emission control system leak detected (gross leak)
• PCM measures the pump load current (EVAP line pressure) when the specified period has passed after EVAP
system is sealed when monitoring conditions are met. If the load does not reach the reference current value
within the specified period, PCM determines that the EVAP system has gross leak.
MONITORING CONDITION
— The ignition switch is turned off.
— IAT: 4.4—35 °C {40—95 °F}
— Battery voltage: 11 V or above
— Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above
— Fuel tank level: 15—85%
— Time from engine off: 5 h 10 min.
P0456 Evaporative emission control system leak detected (very small leak)
• PCM measure the pump load current (EVAP line pressure) when a specified period has passed after EVAP
system is sealed when monitoring conditions are met. If the load does not reach the reference load value or
rate of the load increase lower than the specified within a specified period, PCM determines that the EVAP
system has very small leak.
MONITORING CONDITION
— The ignition switch is turned off.
— IAT: 4.4—35 °C {40—95 °F}
— Battery voltage: 11 V or above
— Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above
— Fuel tank level: 15—85%
— Time from engine off: 5 h 10 min.
P0461 Fuel gauge sender unit range/performance problem
• The PCM monitors the fuel tank level difference before and after the PCM-calculated fuel consumption has
reached more than 25 L {26.4 US qt, 22 Imp qt}. If the difference is less than 5%, the PCM determines that
there is a fuel gauge sender unit range/performance problem.
P0462 Fuel gauge sender unit circuit low input
• The PCM monitors the fuel level signal and fuel gauge sender unit output voltage from the instrument cluster. If
the PCM detects a fuel level or fuel gauge sender unit output voltage is too low, the PCM determines that the
fuel gauge sender unit circuit has a malfunction.
P0463 Fuel gauge sender unit circuit high input
• The PCM monitors the fuel level signal and fuel gauge sender unit output voltage from the instrument cluster. If
the PCM detects a fuel level or fuel gauge sender unit output voltage is too high, the PCM determines that the
fuel gauge sender unit circuit has a malfunction.
P0480 Cooling fan relay No.1 control circuit malfunction
• The PCM monitors the cooling fan relay No.1 control signal voltage and current. If the following conditions are
met, the PCM determines that there is the cooling fan relay No.1 control circuit problem.
— The PCM turns the cooling fan relay No.1 off, but the voltage of the cooling fan relay No.1 control signal
remains low.
— The PCM turns the cooling fan relay No.1 on, but the current of the cooling fan relay No.1 control signal
remains high.
P0481 Cooling fan relay No.2 control circuit malfunction
• The PCM monitors the cooling fan relay No.2 control signal voltage and current. If the following conditions are
met, the PCM determines that there is the cooling fan relay No.2 control circuit problem.
— The PCM turns the cooling fan relay No.2 off, but the voltage of the cooling fan relay No.2 control signal
remains low.
— The PCM turns the cooling fan relay No.2 on, but the current of the cooling fan relay No.2 control signal
remains high.
P0482 Cooling fan relay No.3 control circuit malfunction
• The PCM monitors the cooling fan relay No.3 control signal voltage and current. If the following conditions are
met, the PCM determines that there is the cooling fan relay No.3 control circuit problem.
— The PCM turns the cooling fan relay No.3 off, but the voltage of the cooling fan relay No.3 control signal
remains low.
— The PCM turns the cooling fan relay No.3 on, but the current of the cooling fan relay No.3 control signal
remains high.
3404-1U-05F(01-02).fm 13 ページ ２００６年７月３日 月曜日 午前９時５０分
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