DTC ECM-982A

Condition







The diagnostic trouble code (DTC) indicates an internal fault in the engine control module (ECM). The diagnostic trouble code (DTC) is stored if the engine control module (ECM) has registered that the calculated load (desired air mass) does not correspond to the measured load (signal from the mass air flow (MAF) sensor). The desired value for the mass air flow is calculated from the engine speed (RPM) and throttle angle.

The diagnostic is active when the engine is running.

Substitute value
- the accelerator pedal (AP) is ignored when braking
- the cruise control cannot be activated
- the engine speed (RPM) is limited using fuel shut off. The maximum permitted engine speed depends on the accelerator pedal (AP) position
- the electronic throttle module (ETM) follows the pulse width modulation (PWM) signal from the accelerator pedal directly. The control signal via the CAN is ignored.

Possible source
- something is blocking the throttle position sensor (an oil film, dust etc.)
- defective mass air flow (MAF) sensor
- defective engine control module (ECM).

Fault symptom[s]
- Poor accelerator pedal (AP) response
- Cruise control does not work at all
- Uneven idle.