P1549
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Engine lacks power.
Charge Air. Malfunction
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: Charge air control governing air mass per combustion.
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Test 2: Throttle control governing air mass per combustion.
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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: Actual air mass per combustion is 100 mg/c higher than requested. Charge air control valve PWM reduced as much as possible.
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Test 2: Charge air pressure exceeding 200 kPa. Throttle position reduced more than allowed.
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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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P0100, P0102, P0103, P0112, P0113, P1105, P1106, P1107 and P1108.
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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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Air mass per combustion is limited to 600 mg/c.
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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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Engine running for more than 60s. Charge air control valve PWM has exceeded 10% on one occasion. Engine speed above 2500 rpm. Charge air control governing air mass per combustion. Actual air mass per combustion deviates less than 50 mg/c from the requested.
Or
Engine running for more than 60s. Charge air control valve PWM has exceeded 10% on one occasion. Engine speed 1000-2000 rpm. Requested air mass per combustion exceeding 650 mg/c. Throttle control governing air mass per combustion. Charge air pressure below 160 kPa. Actual air mass per combustion deviates less than 50 mg/c from the requested.
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Fault handling:
(Refer to section “Fault diagnosis, general” for more information.)
Diagnostic help
Start fault diagnosis by checking the three control hoses on the charge air control valve. Then check the basic engine and turbo. If no faults are found, change the charge air control valve.
Diagnostic tool functions related to this fault:
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Diagnostic status for the diagnosis.
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Activation of output for the charge air control valve.
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Refer also to the description of readings under ”Fault diagnosis, general” for more information
