Diagnostic Overview

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW M5, 2009 BMW M6, 2009 BMW M5, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.

Each time the ECH is powered on, a pre-drive check of the throttle valve system is performed.

Positioning of the throttle valve:

The first test is a rationality check of the control loop: A target position is set and the reaction of the position sensor is checked.

If the position is not within the target position tolerance, a fault code "Gest ngetest" (P1628, P161F) is generated.

Adaptation:

The next step is the adaptation of the Zero-Position. After the adaptation is done, the value is checked by the following tests:

Actuator detected an error: generate false code P0123, P0223
Signal range is too high: generate false code P0121, P0221
Value out of range, if not false code P0122, P0222

Safety Switch Off:

The third test is a verification of the safety switch of by the supervisor processor: Before activation of the main processor, the supervisor processor switches off the actuator. If the throttle valve is opening, the error code "Enable-Leitung fehlerhaft" (P1628, P161F) is generated.

Additional the Safety Switch Off is electrically checked all the time. The following errors could detected by the hardware: "Short to GND" (P156D, P157D), "Short to UB" (P156E, P157E) and "Openload" (P156F, P157F).