Diagnostic trouble code (DTC) information
Condition
If Electronic throttle module (ETM) registers that the measured current through the throttle's drive motor does not match the voltage to the drive motor for 0.13 seconds, this information is sent to Engine control module (ECM) which then stores diagnostic trouble code ECM-91F0, Faulty current.
For upgraded software, released during 2006 or later, the above detection time is increased from 0.13 to 10 seconds.
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:DesignFunction
Substitute Value
Closing of throttle during braking.
The accelerator pedal position is ignored when the brake pedal is depressed.
For turbo engines: 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. In driving cycles when the fault is active, no replacement values will be generated.
See Identifying upgraded software ECM/ETM
Possible Source
- the power supply to the throttle unit
- poorly charged battery or corroded in the connecting cables
- defective throttle unit.
- This diagnostic trouble code is generated in combination with other trouble codes. Information on the possible root cause is described.
- For turbo engines: Information about combined diagnostic trouble codes (DTCs)
- For 5-cylnder 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
- the ETS warning lamp lights (C70 and S/V70 -2000 only).