P0140
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Possible misfiring before diagnostic trouble code is generated.
O2S Circuit. No Activity Detected. Sensor 2.
Fault symptoms
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Possible misfiring before diagnostic trouble code is generated.
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On-Board Diagnostics
Type of diagnosis:
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Once per driving cycle. It is interrupted once fault criteria have been fulfilled or OK has been reported. Restarts next driving cycle.
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Enable criteria:
(Conditions that must be fulfilled for diagnostics to be performed.)
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Global conditions for this diagnostic trouble code: When starting the engine, the atmospheric pressure must exceed 78 kPa and the temperature of the coolant and the intake air must exceed -7°C.
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Engine has started. Closed loop active. Coolant temperature above 70°C. Sensor preheating active. Vehicle speed above 0. A counter accumulates the length of time during which all the criteria have been fulfilled. Another counter accumulates the changes in the sensor voltage.
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Fault criteria:
(When enable criteria have been fulfilled, diagnostics will check if the fault criteria have been fulfilled.)
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The accumulated voltage changes are below 500 mV when the time counter has reached 500s.
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Dependents:
(Once fault criteria have been fulfilled, a number of other diagnostics must report OK before the diagnostic trouble code can finally be generated.)
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P0116, P0117, P0118, P0501, P0502, P1141 and P1142.
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System reaction to a fault:
(Once the fault criteria have been fulfilled, certain measures will sometimes be taken.)
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Transition adaptation of closed loop is blocked.
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OK report:
(This diagnosis may be included as a dependent to another diagnosis and must therefore report OK even if it is continuous. The OK report is also used in fault handling to count down the fault counter.)
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P0140 diagnosis performed once and fault criteria not fulfilled. Fault criteria for P0138 not fulfilled.
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Fault handling:
(Refer to section “Fault diagnosis, general” for more information.)
Diagnostic help
Fault diagnosis concerns an electrical fault in the connecting leads or in the sensor.
Diagnostic tool functions related to this fault:
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Diagnostic status for the diagnosis.
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Oxygen sensor reading, unit V.
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Refer also to the description of readings under ”Fault diagnosis, general” for more information
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Note
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The oxygen sensor receives reference oxygen from the surroundings via the connecting cables. For this reason, contact spray or grease must
not
be used on the oxygen sensor connector.
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Check the wiring
Jiggle the wiring harness at several points and in different directions to check if there are intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic instrument during the test.
See
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