Mazda RX-8 2004 Service Highlights page 26

P0461 Fuel gauge sender unit circuit range/performance problem
• The PCM monitors the fuel tank level difference before and after the PCM-calculated fuel consumption has
reached more than 21 L {22.2 US qt, 18.5 Imp qt}. If the difference is less than 5 %, the PCM determines that
there is a fuel gauge sender unit circuit range/performance problem.
P0462 Fuel gauge sender unit circuit low input
• The PCM monitors the fuel tank level and input voltage from the fuel gauge sender unit when the engine is
running. If the input voltage is less than 2.5 V and fuel tank level is full, the PCM determines that the fuel gauge
sender unit circuit input voltage is low.
P0463 Fuel gauge sender unit circuit high input
• The PCM monitors the fuel tank level and input voltage from the fuel gauge sender unit when the engine is
running. If the input voltage is more than 2.5 V and fuel tank level is empty, the PCM determines that the fuel
gauge sender unit circuit input voltage is high.
P0480 Cooling fan No.1 control circuit problem
• The PCM monitors the cooling fan relay No.1 control voltage when the PCM turns the cooling fan relay No.1
off. If the control voltage is low, the PCM determines that the cooling fan No.1 control circuit voltage is low.
• The PCM monitors the cooling fan relay No.1 control voltage when the PCM turns the cooling fan relay No.1
on. If the control voltage is high, the PCM determines that the cooling fan No.1 control circuit voltage is high.
P0481 Cooling fan No.2 control circuit problem
• The PCM monitors the cooling fan relay No.2 control voltage when the PCM turns the cooling fan relay No.2
off. If the control voltage is low, the PCM determines that the cooling fan No.2 control circuit voltage is low.
• The PCM monitors the cooling fan relay No.2 control voltage when the PCM turns the cooling fan relay No.2
on. If the control voltage is high, the PCM determines that the cooling fan No.2 control circuit voltage is high.
P0500 VSS circuit problem
• The PCM monitors the input signal from the vehicle speed sensor when the following conditions are met. If the
input signal is less than 3.7 km/h {2.3 mph}, the PCM determines that there is a VSS circuit malfunction.
MONITORING CONDITION
— Shift lever position: gear is not in neutral position
— Engine speed: more than 2,500 rpm
— LOAD: more than 40.0 %
P0505 Idle air control system problem
• The PCM cannot control idle speed at the target idle speed during the self-test.
P0506 Idle air control system RPM lower than expected
• The PCM compares the actual idle speed with the target idle speed when the engine is running. If the actual
idle speed is lower than targeted by 100 rpm, the PCM determines that the idle air control system RPM is lower
than expected.
P0507 Idle air control system RPM higher than expected
• The PCM compares the actual idle speed with the target idle speed when the engine is running. If the actual
idle speed is higher than targeted by 200 rpm, the PCM determines that the idle air control system RPM is
higher than expected.
P0562 System voltage low (KAM)
• The PCM monitors the battery voltage when the engine is running. If the voltage is less than 2.5 V, the PCM
determines that the system voltage is low.
P0564 Cruise control switch input circuit problem
• The PCM monitors the input voltage from the cruise control switch when the engine is running. If the input
voltage is less than 3.0 V for more than 2 min, the PCM determines that there is a cruise control switch input
circuit problem.
P0571 Brake switch input circuit problem
• The PCM monitors the input signal from brake switch No.1 and brake switch No.2 when the engine is running.
If the both input signals remain on or off, the PCM determines that there is a brake switch input circuit problem.
P0601 PCM memory check sum error
• PCM internal memory check sum error.
P0602 PCM programming error
• No configuration data in the PCM.
P0604 PCM random access memory error
• PCM internal random access memory error.
P0610 PCM vehicle options error
• PCM data configuration error.
P0638 Throttle actuator control circuit range/performance problem
• The PCM compares the actual TP with the target TP when the engine is running. If the difference is more than
the specification, the PCM determines that there is a throttle actuator control circuit range/performance
problem.
P0661 SSV solenoid valve control circuit low
• The PCM monitors the SSV solenoid valve control voltage when the PCM turns the SSV solenoid valve off. If
the control voltage is less than 5.8 V, the PCM determines that the SSV solenoid valve control circuit voltage is
low.
ON-BOARD DIAGNOSTIC
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