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Affected Terminals: 23, 19, 50
Possible Trouble Codes: 33, 34,
132
Engine running at idle speed,
operating temperature
Engine throttle valve CLOSED
(accelerator pedal in idle position)
Vehicles with AT:
Selector lever in
"P" / "N" position
Press key F8 in the system
main menu, select the desired test using the arrow keys and confirm with YES.
Follow the instructions in the
TECH 1 display.
Note:
In this control test, it is
possible to open the exhaust gas recirculation valve within certain limits.
Depending on the size of the opening, more or less exhaust gas is returned to
before the cylinders and is then forced back into the cylinders and
recombusted the next time the intake valves are opened. If a large amount of
exhaust gas is recirculated, the engine does not have enough oxygen for
combustion (the O2 sensors tend towards lean, the injection period
increases). This leads to jerking. At a exhaust gas recirculation rate of
approx. 40 % and above, this jerking becomes noticeable, and becomes
more marked as the recirculation rate increases. At a recirculation rate of
approx. 50 % and above, the engine jerks considerably and, if further
increased, the engine may stall.
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