Mazda 2006 MX-5 Service Highlights page 36

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.
P0500 VSS circuit problem
With ABS/DSC
• If an error in the wheel speed signal from the ABS/DSC HU/CM is detected by CAN when the following
conditions are met:
— Neutral switch and clutch pedal position switch are OFF
— Load is above 40 %
— Engine speed is 2,000 rpm or above
— Brake switch is OFF
— Shift lever position (P, N, R position) (AT)
MT without ABS/DSC
• Vehicle speed signal from vehicle speed sensor is below 3.7 km/h {2.3 mph} when the following conditions
are met:
— Neutral switch and clutch pedal position switch are OFF
— Load is above 40 %
— Engine speed is 2,000 rpm or above
— Brake switch is OFF
P0505 Idle speed control system problem
• The PCM cannot control idle speed toward target idle speed while KOER self test.
01–02–16
ON-BOARD DIAGNOSTIC