EGR CLEANING
Proceed as follows:
1.
Turn off the vehicle and pull out the key.
2.
Electrically disconnect the EGR from the vehicle.
3.
Connect the clamps to the vehicle battery.
4.
Connect the terminals +BATT and DRIVE of the signal generator to the
EGR.
5.
Set the frequency at 1Hz and duty cycle at 50%, then enable the generation
PWM CURRENT DRIVE and leave it for at least 10 seconds, then stop the
generation.
6.
Set the frequency at 10Hz and duty cycle at 50%, then enable the generation
PWM CURRENT DRIVE and leave it for at least 10 seconds, then stop the
generation.
7.
Repeat steps 4 and 5 at least 3 times.
8.
If possible, remove the remains with an air jet, taking care not to damage the
EGR.
9.
Disonnect the signal generator and restore the original connections of the
vehicle.
10.
Start the engine and accelerate slightly for 10s.
VARIABLE-GEOMETRY TURBOCHARGER: DIAGNOSIS OF
BLOCKED BLADES WHEN ENGINE IS OFF
If the control dipstick of the geometry is visually accessible and the turbine
has an electric actuator, it may be sufficient to check visually the control
dipstick itself.
The check has to be operated when the engine is off and while the signal
generator is controlling the blades.
Proceed as follows:
1.
Contact the vehicle's builder to obtain the frequency, together with the valid
interval of duty cycle to pilot the actuator of the turbocharger geometry.
2.
Turn off the vehicle and pull out the key.
3.
Electrically disconnect the control of the variable geometry from the vehicle.
4.
Connect the clamps to the vehicle battery.
5.
Connect terminals +BATT and DRIVE of the signal generator to the control
of variable geometry.
6.
Set a suitable frequency to the turbine under test, and a duty value in the
validity interval indicated at step 1, then activate the generation PWM
CURRENT DRIVE.
7.
Make sure that, by changing the duty cycle in the validity interval indicated
at step 1, the turbine geometry will move the blades correctly.
8.
Disonnect the signal generator and restore the connections of the vehicle.
43
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Summary of Contents for TwinProbe
Page 1: ...TwinProbe User Manual www elektropartner com...
Page 2: ...ENGLISH 5 en...
Page 3: ...2...
