Faulty Signal

ECM-130A MASS AIR FLOW (MAF) SENSOR
FAULTY SIGNAL

Checking connector



- Ignition off.
- Check Mass Air Flow (MAF) sensor connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Permanent Fault


Checking Mass Air Flow (MAF) sensor signal



- Start engine and run to normal operating temperature.
- Switch of all large power consuming components, for example the air conditioning (A/C) compressor, defroster and seat heaters.
- Read the air mass. Check that the air mass is within its various ranges at different engine speeds (RPM) according to Mass Air Flow (MAF) Sensor

Are these values OK?
Yes - Testing Complete
No - Continue below.


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

Remedy as necessary.

Other information:
- To access/replace the mass air flow (MAF) sensor, Mass Air Flow (MAF) Sensor, Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Verification



- Start engine and run to normal operating temperature.
- Switch of all large power consuming components, for example the air conditioning (A/C) compressor, defroster and seat heaters.
- Read the air mass Check that the air mass is within its various ranges at different engine speeds (RPM) according to Mass Air Flow (MAF) Sensor

Are these values OK?
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.