Checking The Throttle Position Sensor

Check whether the engine control module (ECM) has stored any diagnostic trouble codes that indicate a fault in the throttle position sensor of the throttle unit. If diagnostic trouble code ECM-9150 and/or ECM-9160 are stored, they are to be fault traced first. Otherwise, continue as follows.

Use the diagnostic trouble codes' frozen values as well as the counters, to determine the driving conditions when the problem was detected the first time and how often the problem has occurred. The values show the problem's current status and how intermittent the problem is. If the diagnostic trouble code (DTC) was stored under operating conditions that means external factors, such as low battery voltage during engine start-up, are suspected to be the cause fault-trace and remedy as necessary.

If the trouble code was stored when battery voltage was low and engine speed was close to 0 RPM when the fault occurred, it could indicate that the fault arose when the vehicle was stationary with the ignition on for a long period, thereby draining the battery, or that the fault arose due to battery voltage becoming low when the customer started the engine. This, in turn, indicates that the battery's charging status is not OK. Check the battery charge status, connections to the battery and chassis and the battery cables for contact resistance and oxidation. Remedy as necessary. Otherwise, continue as follows.

Download the upgraded software. This software contains several improvements geared toward the throttle unit's throttle position sensor, including improvement of the tolerances for short-term, intermittent disruptions to the throttle position sensor signals. The greatest improvement is that the software can handle a substantially greater difference between throttle position sensors' signals than the previous software.

• Perform test of throttle module's damper position sensor. Click on the VCT2000 symbol to start the test.
  NOTE:

  Certain types of malfunctions of the electronic throttle module (ETM), related to the two internal throttle position sensors, may be temperature-dependent. To be sure of the result, the test should be repeated a number of times in the temperature range between cold engine (ambient temperature) and warm engine (warm engine compartment, engine and induction system).

If the test indicates that the throttle position sensors are not OK, try a new throttle unit (ETM).

Other information 

• See Throttle body (electronic throttle module (ETM)), replacing
• See Identifying upgraded software ECM/ETM
• See Checking wiring and terminals

• Ignition off, wait three minutes so that the main relay / system relay releases the voltage feed to, among other, Electronic throttle module (ETM).
• Then turn on the ignition and turn it off again.
• Wait another three minutes. If the electric cooling fan is running, you have to wait another two minutes after the electric cooling fan has stopped, to make sure that Electronic throttle module (ETM) has been shut off correctly.

  If this is not done correctly, diagnostic trouble codes may remain even after deleting diagnostic trouble codes and any reconfiguration may remain, despite the problem being fixed.

• Continue 

  Refer to Information