P1549
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Engine weak.
Charge Air. Malfunction
Fault symptoms
On-Board Diagnostics
Type of diagnosis:
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Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.
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Enable criteria:
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General conditions for this trouble code: Atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperatures must exceed -7°C.
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Test 1: Charge air control regulating air mass per combustion.
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Test 2: Throttle control regulating air mass per combustion.
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Fault criteria:
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Test 1: Current air mass per combustion is 100 mg/c higher than requested. Charge air control valve PWM has dropped to lowest possible.
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Test 2: Charge air pressure exceeding 200 kPa. Throttle position reduced more than permitted.
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Dependents:
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P0100, P0102, P0103, P0112, P0113, P1105, P1106, P1107 and P1108.
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System reaction to a fault:
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Air mass per combustion limited to 600 mg/c.
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OK report:
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Engine running for more than 60 s. Charge air control valve PWM has exceeded 10% on one occasion. Engine speed higher than 2500 rpm. Charge air control governing air mass per combustion. Current air mass per combustion differs with more than 50 mg/c from the requested. Or, Engine running for more than 60 s. Charge air control valve PWM has exceeded 10% on one occasion. Engine speed 2000-3500 rpm. Requested air mass per combustion exceeding 650 mg/c. Throttle control governing air mass per combustion. Charge air pressure below 160 kPa. Current air mass per combustion differs with less than 50 mg/c from the requested.
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Fault handling:
(See section
Fault handling III, other emission-related components and functions
for more information.)
Diagnostic help
Fault diagnosis starts by inspecting the three charge air control valve hoses. Then, the basic engine and turbo are checked. If no defects are found then the charge air control valve is changed.
Functions in the diagnostic tool related to the fault:
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Diagnostic status for the diagnosis.
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Activate output for charge air control valve.
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See also the description of readings under
Menu "Read Values"
for more information.
