P1140

P1140
Load Calculation - Signal implausible

Function
The engine load signal is calculated using the intake air mass (signal from the Mass Air Flow Sensor) and the engine speed. The secondary engine load signal is calculated using the engine load signal, the engine speed and the throttle valve position.

The engine load signal is corrected by the intake air temperature and an altitude adaptation factor. The altitude adaptation results from the integration of the difference between engine load signal and the corrected secondary engine load signal. From the altitude adaptation factor the altitude can be deducted.

Diagnostic conditions
- Engine must run
- Throttle valve angle between 10° and 60°
- No fault in MAF Sensor
- No fault in Throttle Position Sensor
- Not in boost phase
- No fault in Idle Air Control Valve.





Diagnostic procedure.





Readjust operating cable for cruise control.
Pre-requisite: Throttle in stop position and operating cable for throttle load-free.

Basic adjustment:
1. Slacken lock nut on operating cable for cruise control (wrench size 5.5).
2. Adjust operating cable to obtain a 1 mm distance between the operating cable support and the hexagon-head nut in rest position.
3. Retighten lock nut.

Read specified values for Throttle Position Sensor.
1. Connect system tester.
2. Switch to menu point "Specified values".
3. Select Throttle Position Sensor.
4. Read specified value for closed Throttle Position Sensor. Specified value: approximately 0 %
5. Fully depress accelerator pedal
6. Read specified value for wide open Throttle Position Sensor. Specified value: approximately 75 %.

NOTE: It is important, that the value changes and not stay with one value.








Check intake air system for leaks.
1. Remove intercooler and air cleaner unit.
2. Remove MAF Sensor.
3. Remove protective grille on right side.
4. Install sealing cover 9264/1 with bolts M 4 x 40 to MAF Sensor.

NOTE: Before tightening bolts fully, check positioning of sealing cover at MAF Sensor. There must be no light gap visible.





5. At right rear wheel well, remove front wheel well liner. Close modulated hose of oil reservoir with suitable plug.
6. Apply pressure of approximately 0.5 bar. With sufficient pressure you should hear major leaks. Small leaks can be detected using a leak spray.

NOTE: The leak check involves the entire air intake system, including the intercooler and the oil reservoir.