Diagnostic trouble code (DTC) information

Condition

Fig 1: Identifying PWM Signals From Accelerator Pedal Position Sensor To ETM

Courtesy of VOLVO CARS OF NORTH AMERICA.

If the electronic throttle module (ETM) registers that the engine control module (ECM) requests an infeasible throttle angle (less than 0 or greater than 100 degrees), it sends this information to the engine control module (ECM), which then stores diagnostic trouble code ECM-913F, infeasible request.

The diagnostic trouble code also includes a check that software in the engine control module (ECM) has time to carry out the instructions and calculations it is expected to do in each work cycle. After each work cycle, the engine control module (ECM) sends a code to the electronic throttle module (ETM) via the CAN network. After a correctly completed work cycle, the code should be AAAA. If the electronic throttle module (ETM) detects that the engine control module (ECM) transmits something other than AAAA, it sends this information to the engine control module (ECM), which then stores diagnostic trouble code ECM-913F, infeasible request.

For upgraded software, released during 2006 or later, the Engine control module (ECM), for a 5 cylinder non-turbocharged engine, sends B3B3 after each correctly completed operating cycle. For other engines, BCBC is sent after each correctly completed operating cycle.

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:

See Design
See Function

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.

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 turbo engines and 6-cylinder aspirated engines:

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.

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. Identifying upgraded software ECM/ETM

Possible Source

defective engine control module (ECM)
the power supply to the engine control module (ECM).

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).