Mazda RX-8 2004 Service Highlights page 24

MONITORING CONDITION
— Front HO2S heater monitor: Completed
— Fuel system loop status: Closed loop fuel control
— Engine speed: 2,000—3,500 rpm
— LOAD: 30.0—50.0 %
P0138 Rear HO2S circuit high voltage
• The PCM monitors the input voltage from the rear HO2S when the engine is running. If the input voltage is
more than 1.2 V, the PCM determines that the rear HO2S circuit voltage is high.
P0139 Rear HO2S circuit slow response
• The PCM monitors the rear HO2S inversion cycle period, lean-to-rich response time and rich-to-lean response
time when under the open loop fuel control (fuel cut off control). If the average response time is more than the
specification, the PCM determines that the rear HO2S circuit response is slow.
P0171 System too lean
• The PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) when under closed
loop fuel control. If the fuel trim is more than the specification, the PCM determines that the system is too lean.
P0172 System too rich
• The PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) when under closed
loop fuel control. If the fuel trim is less than the specification, the PCM determines that the system is too rich.
P0222 TP sensor No.2 circuit low input
• The PCM monitors the input voltage from the TP sensor No.2 when the engine is running. If the input voltage is
less than 0.7 V, the PCM determines that the TP sensor No.2 circuit input voltage is low.
P0223 TP sensor No.2 circuit high input
• The PCM monitors the input voltage from the TP sensor No.2 when the engine is running. If the input voltage is
more than 4.8 V, the PCM determines that the TP sensor No.2 circuit input voltage is high.
P0300 Random misfire detected
• The PCM monitors eccentric shaft position sensor input signal interval time. The PCM calculates the change of
the interval time for each rotor. If the change of interval time exceeds the preprogrammed criteria, the PCM
detects a misfire in the corresponding rotor. While the engine is running, the PCM counts the number of
misfires that occurred at 200 eccentric shaft revolutions and 1,000 eccentric shaft revolutions and calculates
misfire ratio for each eccentric shaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM
determines that a misfire, which can damage the catalytic converter or affect emission performance, has
occurred.
P0301 Front rotor misfire detected
• The PCM monitors eccentric shaft position sensor input signal interval time. The PCM calculates the change of
the interval time for each rotor. If the change of interval time exceeds the preprogrammed criteria, the PCM
detects a misfire in the corresponding rotor. While the engine is running, the PCM counts the number of
misfires that occurred at 200 eccentric shaft revolutions and 1,000 eccentric shaft revolutions and calculates
misfire ratio for each eccentric shaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM
determines that a misfire, which can damage the catalytic converter or affect emission performance, has
occurred.
P0302 Rear rotor misfire detected
• The PCM monitors eccentric shaft position sensor input signal interval time. The PCM calculates the change of
the interval time for each rotor. If the change of interval time exceeds the preprogrammed criteria, the PCM
detects a misfire in the corresponding rotor. While the engine is running, the PCM counts the number of
misfires that occurred at 200 eccentric shaft revolutions and 1,000 eccentric shaft revolutions and calculates
misfire ratio for each eccentric shaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM
determines that a misfire, which can damage the catalytic converter or affect emission performance, has
occurred.
P0327 KS circuit low input
• The PCM monitors the input voltage from the KS when the engine is running. If the input voltage is less than
1.2 V, the PCM determines that the KS circuit input voltage is low.
P0328 KS circuit high input
• The PCM monitors the input voltage from the KS when the engine is running. If the input voltage is more than
4.0 V, the PCM determines that the KS circuit input voltage is high.
P0335 Eccentric shaft position sensor circuit problem
• The PCM monitors the input signal from the eccentric shaft position sensor when the mass intake airflow
amount is more than 2 g/s {0.26 lb/min}. If the input signal is not input, the PCM determines that there is a
eccentric shaft position sensor circuit malfunction.
P0336 Eccentric shaft position sensor circuit range/performance problem
• The PCM monitors the input signal from the eccentric shaft position sensor when the engine is running. If the
input signal is not the proper pulse number, the PCM determines that there is a eccentric shaft position sensor
circuit range/performance problem.
2004 Mazda RX-8 Service Highlights (3378–1U–03C)
ON-BOARD DIAGNOSTIC
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