Dtc P0140 [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR
PROCEDURE".
8
(See AFTER REPAIR PROCEDURE
• Are any DTCs present?
DTC P0140
DETECTION
CONDITION
POSSIBLE CAUSE
Downloaded from
Yes
[Z6].)
No DTC troubleshooting completed.

DTC P0140 [Z6]

Rear HO2S circuit no activity detected
• The PCM monitors the input voltage from the rear HO2S when the following
conditions are met. If the input voltage from the sensor never exceeds 0.55
V for 30.4 s, the PCM determines that the sensor circuit is not activated.
MONITORING CONDITIONS
- HO2S, HO2S heater and TWC repair verification drive mode
- Following conditions are met:
• Engine speed is 1,500 rpm or more.
• Engine coolant temperature is 70 °C {158 °F} or more.
• Within feed-back range
Diagnostic support note
• This is a continuous 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.
• 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.
• Rear HO2S deterioration
• Rear HO2S heater malfunction
• Leakage exhaust system
• Open circuit in wiring harness between rear HO2S terminal A and PCM
terminal 2K
• Short to GND in wiring harness between rear HO2S terminal A and PCM
terminal 2K
• Insufficient compression
• Engine malfunction
https://carmanualshub.com/
Go to the applicable DTC inspection.
(See DTC TABLE [Z6].)
- automotive repair manuals website
B3E010200100W16