Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-1300

Condition




If the signal from the mass air flow sensor deviates in relation to the calculated air mass, the diagnostic trouble code is generated in the engine control module (ECM). Calculated air mass is based on throttle position and engine speed.

Substitute value
- initial boost pressure
- rear heated oxygen sensor (HO2S) control shut off
- misfire diagnosis shut off

Possible source

Flow too high:
- short-circuit to supply voltage in the signal cable
- open-circuit in the ground lead
- defective sensor

Flow too low:
- air leakage
- contact resistance
- Contaminated throttle body (TB).
- short-circuit to ground in the signal cable
- open-circuit in signal cable
- open-circuit in power supply cable
- defective sensor

Fault symptom[s]
- poor performance
- Uneven idle