DTC ECM-981A

Condition







The engine control module (ECM) has registered an internal or external fault. Diagnostic trouble code (DTC) ECM-981A is stored in the engine control module (ECM).

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 throttle unit follows the pulse width modulation (PWM) accelerator pedal signal directly, the control signal via CAN is ignored.

Possible source
- something is blocking the throttle position sensor (an oil film, dust etc.)
- the software in the engine control module (ECM) is not up to date
- defective mass air flow (MAF) sensor
- defective accelerator pedal (AP) position sensor
- defective engine control module (ECM)
- defective throttle unit.

Fault symptom[s]
- the accelerator pedal (AP) is ignored when braking
- the cruise control cannot be activated
- uneven idle
- jerks during engine braking.