Mazda 3 Workshop Manual page 102

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
DTC P0133
• The PCM monitors the inversion cycle period, lean-to-rich response time and rich-to-
lean response time of the sensor. The PCM calculates the average of the inversion
cycle period-specified inversion cycles, average response time from lean-to-rich, and
from rich-to-lean when the following conditions are met. If any exceeds the threshold,
the PCM determines that circuit has a malfunction.
MONITORING CONDITIONS
DETECTION
CONDITION
Diagnostic support note
• This is a intermittent monitor (HO2S).
• The MIL illuminates if the PCM detects the above malfunction condition in two
consecutive drive cycles or in one drive cycle while the DTC for the same malfunction
has been stored in the PCM.
• DIAGNOSTIC MONITORING TEST RESULTS is available.
• PENDING CODE is available if the PCM detects the above malfunction condition
during the first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
• Front HO2S deterioration
• Looseness front HO2S
• Pressure regulator (built-in fuel pump unit) malfunction
• Fuel pump malfunction
• Clogged or restricted fuel filter (built-in fuel pump unit)
• Fuel leakage on fuel line from fuel distribution pipe and fuel pump
POSSIBLE
CAUSE
• Leakage exhaust system
• Purge solenoid valve malfunction
• Purge solenoid hoses improper connection
• Insufficient compression
• Engine malfunction (leakage engine coolant)
Diagnostic procedure
Downloaded from
Front HO2S circuit slow response
- HO2S heater, HO2S, and TWC repair verification drive mode
- Following conditions are met:
• Calculation load is 18.0-59.4 % (at 2,000 rpm).
• Engine speed is 1,410- 4,000 rpm.
• Vehicle speed is more than 3.76 km/h {2.33 mph}.
• Engine coolant temperature is more than -10 °C {14 °F}.
• Front HO2S signal inversion cycle is more than 10 cycles.
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