Flow Too Low - Intermittent Fault

ECM-1300 MASS AIR FLOW (MAF) SENSOR
FLOW TOO LOW - INTERMITTENT FAULT

Checking the component, wiring and connector






Check mass air flow (MAF) sensor connector for intermittent contact resistance, oxidation according to [1][2]Checking Wiring and Terminals. Intermittent Faults and intermittent loose connections according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check that there is no air leakage in the intake system or damage to hoses etc. according to Check For Air Leaks In the Intake System

Check signal cable between engine control module (ECM) #A22 (#22) and mass air flow (MAF) sensor #5 for an intermittent short-circuit to ground according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check signal cable between engine control module (ECM) #A22 (#A22) and mass air flow (MAF) sensor #5 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check power supply cable between engine control module (ECM) #39 (#A39) and mass air flow (MAF) sensor #4 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check power supply cable between engine control module (ECM) #A70 (#A70) and mass air flow (MAF) sensor #2 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Remedy as necessary

Other information
- Connecting the breakout box/accessing the control module, Connecting the Breakout Box (ECM)
- To access/replace the Mass Air Flow (MAF) sensor, Mass Air Flow (MAF) Sensor, Replacing
- With the ignition on and mass air flow (MAF) sensor connector connected the voltage at mass air flow (MAF) sensor #2 should be approximately U(bat), mass air flow (MAF) sensor #3 should be ground and mass air flow (MAF) sensor #5 should be approximately 1 volt.
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.