Mazda 3 - Dtc P0140 [Lf]

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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320
VERIFY TROUBLESHOOTING OF DTC
P0138 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn the ignition switch to the ON position
(Engine off).
• Clear the DTC from the memory using the
WDS or equivalent.
• Perform the HO2S heater, HO2S, and TWC
Repair Verification Drive Mode.
(See OBD DRIVE MODE [LF].)
• Is the PENDING CODE for this DTC
present?
(See PCM REMOVAL/INSTALLATION
[LF].)
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
(See AFTER REPAIR PROCEDURE [LF].)
• Are any DTC present?
Yes
Go to the applicable DTC troubleshooting.
(See DTC TABLE [LF].)
No
Troubleshooting completed.
DTC P0140 [LF]
B3E010201084W23
DTC P0140
Rear HO2S no activity detected
DETECTION
CONDITION
• 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 above 1,500 rpm.
• Engine coolant temperature is above 70 °C {158 °F}.
Diagnostic support note
• This is a continuous monitor (HO2S).
• 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 first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.