Faulty Signal

ECM-9818 BRAKE VACUUM LEAKAGE
FAULTY SIGNAL

Checking the air mass
- Start the engine and run it to normal operating temperature.
- Switch of all large power consuming components, for example the air conditioning (A/C) compressor, defroster and seat heaters. These influence the load on the engine and therefore the measurement value
- Read off the air mass. Check that the mass air flow and engine speed (RPM) follow each other according to Mass Air Flow (MAF) Sensor

Are these values within their permitted ranges?
Yes - Testing Complete
No - Continue below.


Checking for air leakage
Check for air leakage in the intake system, in particular the hose between the mass air flow (MAF) sensor and the throttle body (TB). Check for leakage and damage according to Check For Air Leaks In the Intake System

Remedy as necessary.


Verification
- Start the engine and run it to normal operating temperature
- Switch of all large power consuming components, for example the air conditioning (A/C) compressor, defroster and seat heaters.
- Read off and check that the mass air flow and engine speed (RPM) follow each other according to Mass Air Flow (MAF) Sensor

Are these values within their permitted ranges?
Yes - Testing Complete
No - Continue below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed. Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.