Diagnostic Trouble Code (DTC) Information ECM-1300
Condition
The diagnostic trouble code (DTC) is stored (Signal too high/Signal too low) if the engine control module (ECM) detects that the value for measured mass air flow deviates from a calculated value for the air mass.
The diagnostic trouble code (DTC) is stored (faulty signal) if the engine control module (ECM) detects that the correction factor for the air mass (measured air mass/desired air mass value) is too high or too low, while the long-term fuel trim is above/below a set value.
The diagnostic trouble code (DTC) can be diagnosed when the engine is running.
Substitute Value
- Calculated boost pressure
- Calculated air mass
- Rear heated oxygen sensor (HO2S) control shut off
- Misfire diagnostic shut off.
Possible Source
Flow too high
- Short-circuit to supply voltage in the signal cable
- Open-circuit in the ground lead
- Damaged sensor.
Flow too low
- Air leakage
- Contact resistance in the mass air flow (MAF) sensor connector
- Short-circuit to ground in the signal cable
- Open-circuit in the signal cable
- Open-circuit in the voltage supply cable
- Damaged sensor.
Faulty signal
- Contact resistance in the mass air flow (MAF) sensor connector
- Air leakage in the intake system
- Blocked intake system
- Damaged sensor.
Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- Poor performance.