Diagnostic trouble code (DTC) information ECM-9150

Condition 

Electronic throttle module (ETM) monitors continuously that the two internal throttle position sensors' signals are within permitted limits and that they show the same values.

• If Electronic throttle module (ETM) registers that the signal from any of the throttle position sensors at any time is outside the upper or lower limit for longer time than 0.1 seconds, then this information is sent to Engine control module (ECM), which then stores diagnostic trouble code ECM-9150/9160, Faulty signal.
• Every time the ignition is turned on the Electronic throttle module (ETM) controls the throttle disc to its lower mechanical stop position (closed throttle). The Electronic throttle module (ETM) checks that the throttle position sensors' signal is within a certain range. If Electronic throttle module (ETM) registers that any of the throttle position sensors' signals are outside this range, then this information is sent to Engine control module (ECM), which then stores diagnostic trouble code ECM-9150/9160, Faulty signal.
• Electronic throttle module (ETM) checks continuously that the two internal throttle sensors show the same throttle position. If the difference between the sensors' signal is greater than 5 % for longer time than 0.2 seconds, then this information is sent to Engine control module (ECM), which then stores diagnostic trouble code ECM-9150/9160, Faulty signal.

For upgraded software, released during year 2006 or later, the following is changed: 

• The test that Electronic throttle module (ETM) performs every time the ignition is turned on, now requires that both throttle position sensors' signals are outside the expected range, two test in a row, in order to store the diagnostic trouble code.
• Electronic throttle module (ETM) checks continuously that the two internal throttle sensors show the same throttle position. A choice of signal will take place when the difference between signals is greater than 2 %. The signal choice makes it possible to continue driving until the difference between the throttle position sensors' signals is clearly greater than for earlier software. The diagnostic trouble code is stored when the deviation between the two signals is 15 % for 5 seconds at low throttle angles.

  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:

• See Design
• See Function

Substitute Value 

Closing of throttle during braking. 

The accelerator pedal position is ignored when the brake pedal is depressed.

In case diagnostic trouble code ECM-9150 and ECM-9160 are stored together:

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.

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.

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.

For upgraded software, released in 2006 or later, adjustments have been made to substitute values. In the driving cycles when the problem is active the fuel shut-off will follow the accelerator pedal position.

See Identifying upgraded software ECM/ETM

Possible Source 

• Low voltage feed to throttle module (loose connections).
• Poor ground connection to electronic throttle module.
• defective electronic throttle module (ETM).

This diagnostic trouble code is generated in combination with other trouble codes. Information on the possible root cause is described.

See Information about combined diagnostic trouble codes (DTCs)

Fault symptom[s] 

• the accelerator pedal (AP) is ignored when braking
• the cruise control is not functioning at all
• uneven idle
• jerks during engine braking.