Documented entry points
MS4X describes both throttle and idle-valve participation in MS43 air control. Locate these names in the matching definition:
| Function | Examples |
|---|---|
| Actuator requests | ip_tps_sp_pvs; ip_isapwm_pvs |
| Pedal-release processing | ip_pvs_dif_neg_fac; ip_pvs_dif_cr_neg |
| Pedal input shaping | ip_pvs_cor_max_rpl_[gear] family |
| Throttle closing shaping | ip_tps_req_ltc_lgrd_[gear] family |
| Torque ceiling | ip_tq_max__n__pvs_cor_rpl |
Bracketed names are abbreviated groups. MS4X reference.
Trace the request before editing the response
Frame the investigation as a chain: driver input, processed request, actuator command, actual actuator position and resulting engine behaviour. Collect the available signals at each step. Annotate gear, clutch, temperature and fault state alongside the time series.
For example, if pedal position changes quickly but the processed request changes slowly, the next question concerns the input-processing path. If the request changes but the actuator does not follow, compare command, actual position and diagnostic state. These are ways to localise a question; they do not identify a parameter value that is suitable for every car.
Review torque interventions with the model
Keep the original torque model, relevant load values and intervention evidence with any modified-engine comparison. An intervention can be useful evidence that the requested operating region and the model no longer agree. A ceiling change alone does not demonstrate that airflow, fuel delivery or monitoring remain consistent.
Evaluate driveability as well as the steady result
Use repeatable tip-in, lift-off and shift events, including both low and higher electrical/accessory loads where relevant. Preserve the original trace, state the intended effect of each edit, and evaluate the same event afterwards. Keep this MS43 processing reference separate from the fuel-mass and torque relationships documented under MS45.
Sources and scope
Original reference notes by Tuning Wiki, informed by the linked MS4X Wiki pages. MS4X Wiki contributors and the authors credited by each linked project remain the source authors. Sources checked 10 November 2026. Suggested validation steps and worked arithmetic are editorial guidance; they are not a tested calibration or a claim of hardware verification.
- Siemens MS43 (revision 23749).