Diagnostic trouble code (DTC) information ECM-911A
Condition
The control modules communicate with each other in a network via standardized serial communication - CAN (controller area network). If the electronic throttle module (ETM) registers a serious disruption (CAN communication blocked) on the CAN network, this information is saved in the electronic throttle module (ETM).
If the CAN network starts working during the same operating cycle in which the fault occurred, information on the fault is transmitted to the engine control module (ECM), which stores diagnostic trouble code ECM-911A, faulty communication. If the CAN network is not operable until the next operating cycle, the information may not be transmitted to the engine control module (ECM).
For upgraded software, released during year 2006 or later, this diagnostic trouble code is no longer necessary and therefore has been removed.
See Identifying upgraded software ECM/ETM
For more information about the electronic throttle system and related components such as the electronic throttle module, accelerator pedal position sensor, brake light switch, clutch pedal position sensor, and brake pedal position sensor:
Substitute Value
Fuel cut-off that follows accelerator pedal position.
Engine speed is regulated via fuel cut-off by deactivating the injectors one at a time. Engine speed is determined by gas pedal position sensor position and engine speed is maximized to about 5000 RPM. This reconfiguration can cause the engine to idle very unevenly since the engine control module (ECM) regulates engine speed by cutting of the fuel to the cylinders individually. Do not confuse this reconfiguration (engine behavior) with an actual driveability problem that was present before reconfiguration.
Closing of throttle during braking.
The accelerator pedal position is ignored when the brake pedal is depressed.
Throttle follows accelerator pedal position.
The throttle and accelerator pedal are used as if they were mechanically connected. This reconfiguration is always followed by fuel cut-off.
Cruise control off.
Cruise control off during entire operating cycle in which fault was detected. If the fault is no longer present, the function is available the next time the car is started.
The following only applies in combination with diagnostic trouble code ECM-9180 or ECM-918F:
- Throttle closed.
- The electronic throttle module (ETC) deactivates the throttle motor control, which means that the throttle is not actuated and assumes its mechanical stop position. This means about 20% throttle opening. This reconfiguration is always followed by fuel cut-off.
Possible Source
- loose connections or contact resistance in the terminals for the CAN
- open-circuit in one or both CAN signal cables
- short-circuit to ground, voltage or each other in one or both of the CAN signal cables
- interference on the CAN signal wiring
- defective node in the Control area network (CAN).
- This diagnostic trouble code is generated in combination with other trouble codes. Information on the possible root cause is described.
For turbo engines and 6-cylinder aspirated engines:Information about combined diagnostic trouble codes (DTCs)
For 5-cyl. normally aspirated engines. Information about combined diagnostic trouble codes (DTCs)
Fault symptom[s]
- the accelerator pedal (AP) is ignored when braking
- the cruise control cannot be activated
- uneven idle
- jerks during engine braking
- the ETS warning lamp lights (C70 and S/V70 -2000 only).
The following only applies in combination with diagnostic trouble codes (DTCs) ECM-9180 or ECM-918F:
- very poor accelerator response
- maximum speed approximately 50 km/h.