Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-929D

Condition




The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the internal governor for control of the throttle angle in the throttle unit is damaged or that the control signal for the governor is too low when controlling the throttle.
The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute value
The engine control module (ECM) shuts down the supply to the damper motor for the electronic throttle unit. Throttle will set itself in the return position, or reversible fuel shut-off will take place.

Possible source
- The throttle is sticking or is blocked (e.g. oil film, dust)
- Contact resistance or oxidation in the terminals between the engine control module (ECM) and the electronic throttle unit
- Open-circuit, short-circuit to ground or short-circuit to supply voltage in the wiring for the damper motor in the throttle unit
- Short-circuit to each other in the wiring for the damper motor in the throttle unit
- Damaged throttle unit
- Faulty software in the engine control module (ECM).

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- Poor performance.