Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




Diagnostic trouble code (DTC) ECM-13 is stored if the control module detects that the signal from the mass air flow (MAF) sensor is too high or too low.

Substitute value
- Initial boost pressure
- No idle air trim adaptation
- No long-term fuel trim
- No three-way catalytic converter (TWC) diagnostic
- Limited EVAP control
- The boost pressure sensor and the intake air temperature (IAT) sensor are used to calculate the mass air flow.

Possible source

Signal too high:
- Short-circuit to supply voltage in the signal cable
- Open-circuit in the ground lead
- Faulty mass air flow (MAF) sensor.

Signal too low:
- Short-circuit to ground in signal cable
- Open-circuit in the signal cable or the power supply
- Air leakage in the intake system
- Faulty mass air flow (MAF) sensor
- Faulty idle air control (IAC) system.

Fault symptom[s]
- High idling speed
- Low idling speed
- Malfunction indicator lamp (MIL) lit.