|
No.
|
TECH 1 Display
|
Conditions for
Checking
|
Nominal Value
|
Trouble Codes
|
Terminal
|
|
|
05
|
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).
Check 1 (check of tank vent
valve):
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.
The check is completed after a
maximum of 30 s.
Note:
Tank vent valve = controlled canister purge valve (TECH 1
display will be changed at a later date).
|
Noise check Hold tank vent valve
in hand:
clicking noise
|
61,
62
|
5,
19
|
|
|
05
|
SELECT
ACTUAT OR
FUEL
TANK VENT
|
Check 2 (check of tank vent
system):
Ignition OFF
Disconnect rear hose (to
activated carbon canister) from tank vent valve (installed near direct
ignition module).
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
Throttle valve CLOSED
(accelerator pedal in idle position)
Vehicle stationary
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.
|
TECH 1 display shows
alternating:
0 %
50 %
Intake noise ON / OFF from tank
vent valve
|
61,
62
|
5,
19
|
|
|
Notes on Trouble - shooting:
|
Nominal Value:
|
Cause of Fault:
|
|
|
As the hose at the tank vent
valve is only accessible with some difficulty in the X 20 SE
engine, the check can also be performed as follows:
Do not disconnect hose. Carry
out check as described above.
When the tank vent valve is
opened by TECH 1, 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 the engine speed does not
decrease during this actuator test, this may be because not enough fuel
vapour has collected in the activated carbon canister. If, however, there is
too much fuel in the activated carbon canister, the engine speed may sink so
low that the engine stalls.
|
|
· 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 fuel pump 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 (brownlred) 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
Nominal values are attained
|
No leaks
No kinks
Passage
|
· Vacuum hoses blocked or defective
· Activated carbon canister blocked or
defective
· Tank vent valve Y 34 defective
· Control unit K 61 defective
|
|
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|
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