P1142
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
O2S Heater Circuit. Current too High, Sensor 2.
Fault symptoms
On-Board Diagnostics
Type of diagnosis:
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Continuous. However, it is interrupted once the fault criteria have been fulfilled and does not restart until the 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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Test 1 Engine running. Main relay voltage exceeding 10V. Preheating active.
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Test 2 Engine running. Main relay voltage exceeding 10V. Preheating active for more than 60s.
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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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Test 1: Output voltage exceeding 2V for more than 5s.
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Test 2: Current exceeding 2300 mA for more than 5s.
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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.)
System reaction to a fault:
(Once the fault criteria have been fulfilled, certain measures will sometimes be taken.)
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Effect of the oxygen sensor on the closed loop system is zeroed.
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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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Enable criteria fulfilled. Fault criteria for P1141 or P1142 not fulfilled within 60s.
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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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Activation of the output for preheating.
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Oxygen sensor preheating current, unit mA.
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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.
Refer also to the description of activations under ”Fault diagnosis, general” for more information.
See
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