|
No.
|
TECH 1-Display
|
Conditions
for Checking
|
Nominal
Value
|
Trouble
Codes
|
Terminal
|
|
06
|
SELECT
ACTUATOR FUEL TANK VENT
|
Notes on checking:
Carry out check 1 if engine
does not start; otherwise proceed directly with check 2 (check of tank vent
system).
|
|
61,
62
|
5,
19
|
|
|
|
Check 1 (check of tank vent
valve system):
Ignition ON
Engine OFF
Press key F5 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:
The tank vent valve is actuated
at a frequency of 0.5 Hz (actuation duration 1 s).
The check is completed after a
maximum of 30 s.
|
Noise check:
Hold tank vent valve in hand:
quiet clicking noise
|
|
|
|
|
|
Check 2 (check of tank vent
valve system):
Disconnect rear hose (to
activated carbon canister) from tank vent valve (installed near right spring
strut dome beside the fuel hose). The disconnected hose must be closed off to
prevent fuel vapour from escaping from the activated carbon canister.
Engine running at idle speed,
operating temperature
|
TECH 1 display shows
alternating:
0 %
50 %
Intake noise ON / OFF from
tank vent valve
|
|
|
|
|
|
Throttle valve CLOSED
(accelerator pedal in idle position)
Vehicle stationary
Press key FS 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.
|
Intake noise ON / OFF from tank vent valve
|
|
|
|
|
|
Note:
As the hose at the tank vent
valve is only accessible with some difficulty, the check can also be
performed as follows:
Do not disconnect hose. Carry
out check as described above.
When the tank vent valve opens,
the engine is supplied with additional fuel (precondition: enough fuel vapour
in the activated carbon canister). This can lead to a brief drop in engine
speed.
If, however, there is too much
fuel in the activated carbon canister, the engine speed may sink so low that
the engine stalls.
|
|
|
|
|
|
|
|
|
|
|
|
Notes on Trouble - shooting:
|
Nominal Value:
|
Cause of Fault:
|
|
· Ignition
ON
|
|
|
|
· Using
multimeter, measure voltage at tank vent valve plug Y 34 / RTBL
(red / blue) to ground
|
11.5 to 13.5 V
|
· Lead
interruptions from control unit K 61 / Ter. 37 or from
injectors relay K 43 / Ter. 8 to tank vent valve
Y 34 / RTBL (red / blue)
|
|
Ignition OFF
· Disconnect
control unit K 61 from wiring harness
· Using
multimeter, check from tank vent valve plug Y 34 / BRRT
(brown / red) to control unit K 61 / Ter. 5 for passage
and short circuit to ground
|
0 W
|
· Short
circuit or lead interruption from tank vent valve Y 34 / BRRT
(brown / red) to control unit K 61 / Ter. 5
|
|
· Check
vacuum hoses between tank vent valve Y 34 and
- activated
carbon canister
- tank
for leaks, kinks and passage
|
No leaks
No kinks
Passage
|
· Vacuum
hoses blocked or defective
|
|
· Activated
carbon canister blocked
|
|
· Nominal
values are attained or defective
· Tank
vent valve defective
· Control
unit K 61 defective
|
|
|
|
|
|
|
|
|
|
|
|
