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Conditions for Checking
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Nominal Value
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Affected Terminals:
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Possible Trouble Codes:
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Note:
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Before adjusting the idle speed
and thus reprogramming the fixed values, it is useful if the amount that the
engine speed is going to be increased or decreased is known, as once
adjustment is completed, communication is broken off and has to be re -
established from scratch. If the newly programmed idle speed does not then
suit the requirements, the whole procedure has to be repeated.
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It is simpler to first establish
the desired idle speed increase or decrease using the "engine
speed" test described in "F8: ECU control", and then program
this fixed value using the adjustment procedure described below.
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Ignition ON
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Engine OFF
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Press key F 6 in the
main menu, select the desired test using the arrow keys and confirm with YES.
Follow the instructions in the TECH 1 display.
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If programming is commenced
while the engine is running, the two TECH 1 displays on the right will
appear immediately after one another, requesting that the mechanic perform
the same actions twice.
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STOP
ENGINE
TURN
OFF
IGNITION
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The two displays appear for the
first time before programming, to ensure that the programming is performed
with the engine OFF. The displays appear for the second time after
programming, which only lasts for a few milliseconds, to reinitialize the
system. If communication between TECH 1 and the control unit is
interrupted between the two displays, the ignition should be switched on
again immediately.
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TURN
ON
IGNITION
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Note:
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It is possible to change the
idle speed in the range from 704 to 1008 rpm using the arrow keys:
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· Arrow
key up: engine speed increases in steps of 16 rpm
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· Arrow
key down: engine speed decreases in steps of 16 rpm
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The set idle speed is confirmed
with "ENTER".
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When the ignition is switched
off and on again after programming, the new idle speed is stored in the
EEPROM.
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If the display on the right
appears after programming is completed, the programming was successful. The
engine should then be started and the relevant data list parameter (engine
speed) selected at idle speed. The displayed idle speed must correspond to
the adjusted value.
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MIN.
DESIRED IDLE
UPDATE
SUCCESSFUL!
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If, however, the display on the
right appears after programming, a fault has occurred during programming.
The following measures should be
carried out consecutively:
· Read
out trouble codes
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MIN.
DESIRED IDLE
UPDATE
FAILED!
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· Repeat
programming
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· Perform
TECH 1 self - test
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· Check
TECH 1 cable for damaged insulation and shielding
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· Repeat
programming with new control unit
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