Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-901E

Condition




The engine control module (ECM) performs a number of internal tests to check that the processor, software and memory are operating properly. If any of these tests register a fault, the diagnostic trouble code is generated.

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.
For upgraded software, released in 2006 or later, adjustments have been made to substitute values. Cruise control will not be operable and the throttle will follow the accelerator pedal position during the operating cycles in which the fault is active.

Possible source
- defective engine control module (ECM)
- This diagnostic trouble code is generated in combination with other trouble codes. Information on the possible root cause is described.

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