P1634

107A80 - P1634

Information saved in
DME

Fault code
107A80 - P1634

Fault text
Throttle-valve actuator, closing spring check: abort check,
spring does not close

Fault description
During the spring test the diagnostic function monitors the
throttle valve to determine whether it returns to the
emergency air position within the specified period when no
voltage is being applied.

Condition for fault identification
Test condition:
The fault is recognized when the throttle valve does not
return to an aperture of less than roughly 19% within 560 ms
when voltage is not being applied to the unit.
Potential problem source(s):
- Stiction in valve
- Return spring defective
- Defect in wiring harness between throttle-valve actuator
motor and DME
- Defective throttle-valve actuator motor
Terminal condition: Terminal 15
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- None
Time condition:
- None
Other conditions:
- Engine on
- Vehicle velocity = 0 km/h

Condition for fault memory entry
This fault is logged in the control module's fault memory
immediately.

Action in service
- Check wiring harness between DME and throttle valve
- Use tester to activate throttle valve and observe its reaction
- Check throttle valve for contamination and foreign objects
- Move throttle valve by hand, checking for resistance to
motion and noting how quickly it closes when released
- Replace throttle-valve actuator motor

Fault effect and breakdown warning
Breakdown notice:
- It is possible to continue driving the vehicle, but passing
maneuvers should not be attempted owing to the reduction
in engine output.
Possible apparent symptoms:
- Reduced power

Driver information
Warning light:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: on
- CC message: on
- US emissions warning lamp: on
- US electronic engine power reduction: on
- CC message: on

Service instruction
none