P1127, P1128
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Check Engine on. Poor performance.
P1127
Boost Pressure To Low Mechanical Fault
P1128
Boost Pressure To High. Mechanical Fault
Fault symptom
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Check Engine on. Poor performance.
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Conditions
The following conditions apply for the DTC in question:
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P1127:
Engine temperature 40-100°C (104-212°F), intake air temperature -5&°C to +45°C (23-113°F), air pressure 88-110 kPa. This DTC will be generated if these conditions are fulfilled and the boost pressure is more than 30 kPa below the desired value for more than 6 seconds.
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P1128:
Engine temperature 40-100°C (104-212°F), intake air temperature -5°C to +45°C (23-113°F), air pressure 88-110 kPa. This DTC will be generated if these conditions are fulfilled and the boost pressure is more than 15 kPa above the desired value for more than 6 seconds.
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Diagnostic help
P1127:
The DTC indicates a mechanical malfunction. The EGR function is turned off.
P1128:
The EGR function is turned off. The DTC indicates a mechanical malfunction. If DTC P0120 is present in the EDC control module at the same time as P1128 then P0120 can be neglected.