Diagnostic trouble code (DTC) information

Condition

Fig 1: Identifying Mass Air Flow (MAF) Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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.