Engine Controls System: 100001

100001 - P1638

Information saved in
DME

Fault code
100001 - P1638

Fault text
Throttle valve, function: jammed briefly

Fault description
The diagnostic function monitors the throttle valve control
signal for excessively high figures that would indicate that
the throttle valve is sticking or seizing.

Condition for fault identification
Test condition:
This fault is logged and the throttle valve is deactivated
when the PWM signal used to control the throttle valve
remains above 80% for longer than 5 sec.
Potential problem source(s):
- Throttle valve moves stiffly, sticking, contaminated
- 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:
- Active control signal to throttle valve

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

Action in service
- Use tester to activate throttle valve and observe
repositioning speed
- Check wiring harness between DME and throttle valve
- Visual inspection of throttle valve and air-induction system
for contamination
- Move the throttle valve manually to determine whether it
progresses throughout its entire travel range freely without
excess resistance
- Replace throttle valve

Fault effect and breakdown warning
Breakdown notice:
Ability to continue driving is restricted because engine
speed is limited to roughly 1300 rpm.
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