Mazda RX-8 2004 - Page 25

ON-BOARD DIAGNOSTIC
01–02–10
2004 Mazda RX-8 Service Highlights (3378–1U–03C)
Revised 11/2004 (Ref. No. R077/04)
P0410 AIR system problem
• The PCM monitors the front HO2S output current when the AIR control is operating. If the output current is less
than the specification, the PCM determines that there is an AIR system problem.
P0420 Catalyst system efficiency below threshold
• The PCM monitors the input voltage from the rear HO2S and the front HO2S output current when the following
conditions are met. If the input voltage change is extremely large compared to the output current change, the
PCM determines that the catalyst system has deteriorated.
MONITORING CONDITION
— ECT: more than 70 °C {158 °F}
— Catalyst converter temperature: more than 400 °C {752 °F}
— Engine speed: 1,500—3,500 rpm
— LOAD: 20—50% (maximum calculated load value varies depending on engine speed.)
— Time with purge control system does not operate: more than 20 s
P0441 EVAP system incorrect purge flow
• The PCM monitors the purge line vacuum, when the following conditions are met. If the vacuum between the
charcoal canister and the intake manifold does not reach the specification, the PCM determines that the EVAP
system purge flow is incorrect.
MONITORING CONDITION
— Vehicle speed: 25—49 km/h {16—30 mph}
— Engine speed: 1,200—3,000 rpm
— Throttle valve opening angle: 0—31.7 % (changes by engine speed)
P0442 EVAP system leak detected (small leak)
• The PCM monitors the pump load current (EVAP line pressure) when the specified period has passed after
EVAP system is sealed when the following conditions are met. If the pump load current does not reach the
reference current value within the specified period, the PCM determines that the EVAP system has small leak.
MONITORING CONDITION
— BARO: more than 72 kPa {542 mmHg, 21.33 inHg}
— IAT: 5—40 °C {41—104 °F}
— Fuel tank level: 15—85 %
— Battery voltage: 11.0—14.6 V
— Ignition switch: OFF
P0443 Purge solenoid valve circuit problem
• The PCM monitors the purge solenoid valve control voltage when the PCM turns the purge solenoid valve off. If
the control voltage is less than 5.8 V, the PCM determines that the purge solenoid valve control circuit voltage
is low.
• The PCM monitors the purge solenoid valve control voltage when the PCM turns the purge solenoid valve on. If
the control voltage is more than 11.5 V, the PCM determines that the purge solenoid valve control circuit
voltage is high.
P0446 EVAP system vent control circuit problem
• The PCM monitors pump load current (EVAP line pressure) when the evaporative leak monitor is operating. If
the decrease in pump load current is less than the specification after the reference current value has been
obtained, the PCM determines change over valve in EVAP system leak detection pump has a malfunction.
P0455 EVAP system leak detected (large leak)
• The PCM monitors the pump load current (EVAP line pressure) when the specified period has passed after
EVAP system is sealed when the following conditions are met. If the pump load current does not reach the
reference current value within the specified period, the PCM determines that the EVAP system has large leak.
MONITORING CONDITION
— BARO: more than 72 kPa {542 mmHg, 21.33 inHg}
— IAT: 5—40 °C {41—104 °F}
— Fuel tank level: 15—85 %
— Battery voltage: 11.0—14.6 V
— Ignition switch: OFF
P0456 EVAP system leak detected (very small leak)
• The PCM monitors the pump load current (EVAP line pressure) when a specified period has passed after EVAP
system is sealed after ignition switch is turned OFF. If the pump load current does not reach the reference load
value or rate of the load increase lower than specified within a specified period, the PCM determines that the
EVAP system has a very small leak.
MONITORING CONDITION
— BARO: more than 72 kPa {542 mmHg, 21.33 inHg}
— IAT: 5—40 °C {41—104 °F}
— Fuel tank level: 15—85 %
— Battery voltage: 11.0—14.6 V
— Ignition switch: OFF