172
Model Code Page
37. Autocontrol 5.2 (K41107---)
1. 8. 2000
371 14
6250--8950
1. 9. 2002
C. Front clutch pe dal limit switch S9 and
rear pedal switch S2W, reconditioning
Note! The limit switches’ activating point has been
changed into zero point of the clutch pedal posiiton in AC
5.2. That is why the switch activating point is not necessary
to adjust accurately. The limit switch must be adjusted so
that it functions near the pedal lower position, but the func-
tioning is never the less surely (e.g. 1cm pedal movement).
1. If the limit switches have malfunctions, the self diagnosis
shows the following fault codes:
--- d133: The front and rear pedal limit switches active si-
multaneouly. Switches possible damaged or short circuit in
wires.
--- d215: The front pedal position greater than 50 % and
kimit switch S9 active simultaneously. Switch damaged or
short circ uit in wires.
--- d254: Rear pedal position greater than 50 % and limit
switch S2W active simultaneously. Switch damaged or
short circuit in wires (this fault code appears only when the
seat is turned rearwards).
2. Then check the limit switch position and wires. The limit
switch function can be checked in the test mode, see table
B on page 371/8.
3. If You doubt poor contacts, check the wire connections
on t he switch S9. Also check the contro l unit connector
A1A7 and earth point GR5.
4. Check the rear pedal switch S2W wires on it. Check earth
point GR1 and connector A1A2 of the control unit.
Note! If the wires seem to be OK, and the switch functions
when testing it with finger, but still malfunctions occur, the
switch can be defective or control unit of AC 5.2 can be
damaged. Then change the co mponents in quest ion.
D. Gas ped al (fuel injection pump) posi-
tion sensor B15, reconditioning
Note! In AC 5.2 system the gas pedal position sensor is
fastened so that its position cannot be adjusted.
Note! If the gas pedal position sensor has malfunctions, it
affects the automatic or manual functions of DPS (auto1,
auto2, Speed Matching, AutoTraction et c). Defective engine
rotation speed sensor can also cause these malfunctions in
DPS.
Note! The rear gas pedal ( TwinTrac ) has been connected
with a cable to the front gas pedal. When necessary, the
cable must be adjusted.
The self diagnosis shows the following fault codes, when
the gas pedal position sensor has malfunctions:
--- A128: Reference voltage of the gas pedal (and clutch
pedal) position sensor is not within given limits (4,5---5,5
VDC)). Eventually wires in short circuit.
--- A313: Signal from the gas pedal sensor under 0,4 or
over 4,4 VDC. Sensor wrongly fastened or wire damages.
Battery voltage can be too low.
1. Check in the test mode (table C on page 371/9), whether
the sensor values are within the given limits (point A4 in the
table). If the functi on is defective, c heck the sens or fitting
and wires. Also check the sens or pin bearings (no clear-
ance) and pin wear (and fuel injection pump pin wear).
If the signal voltage is missing or it is not in limits, check the
supply voltage (4,75---5,25 V) and signal voltage by means
of measuring cable ETV 894510.
1=4,75---5,25 V
2= ground
4=signal
Direction A
Theendoftheloc-
king screw is pus-
hed a little inside
the spindle hole.
Lock the screw with
Loctite 222.
A
1 Pun, supply volt age +4,75...+5,25V
4 Sin, Signal voltage
2Mus,GND
ETV 894 510
Accelerator pe-
dal
Up In bottom
Signal voltage 2,0---4,7 V 0,3---3,0 V
2. If You think poor contacts, check the sensor connector and
wires. Check connecto r X1A pins 1, 2 and 3 and connector
X19 pins 28, 29 and 37. Also check the contro l unit connector
A1A5.
3. If the sensor fitting and its wires seem to be OK, but still mal-
functions appear, the sensor itself can be damaged or the
control unit A1. Change a damaged part.
4. After the fault has been repaired, carry out gas pedal ca-
libration according to instr. B on page 370/15. If the rear
clutch pedal has malfunctions, adjust the pedal cable.
Note! The gas pedal position sensor must be calibrated after
the first 500 running hours and later at intervals of 1000 run-
ning hour s.
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