Content .. 2266 2267 2268 2269 ..
Opel Frontera UBS. Manual - part 2268
6E–108
6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS
Circuit Description
D
The powertrain control module (PCM) controls
engine speed by adjusting the position of the throttle
control valve (DC motor). The throttle motor is a DC
motor driven by one coil. The PCM applies current to
the DC motor coil in PWM (%) to adjust the throttle
valve into a passage in the throttle body to allow air
flow. This method allows highly accurate control of
engine speed and quick response to changes in
engine load.
D
The acceleration position (AP) sensor circuit provides
a voltage signal relative to acceleration pedal angle.
The acceleration pedal angle will vary about 13% at
idle position to about 87% at wide open
throttle(WOT).
APS signal is used to determine which DC motor will
adjust throttle position.
After the APS signal has been processed by the
PCM, it will command DC motor to allow movement of
throttle position.
Diagnostic Aids
D
An intermittent may be caused by a poor connection,
rubbed-through wire insulation or a wire broken inside
the insulation. Check for poor connections or a
damaged harness. Inspect the PCM harness and
connector for improper mating, broken locks,
improperly formed or damaged terminals, poor
terminal-to-wire connection, and damaged harness.
D
Throttle body – Check for objects blocking the DC
motor or throttle bore, excessive deposits in the ETC
passage and on the valve spring, and excessive
deposits in the throttle bore and on the throttle valve
plate.
D
Acceleration pedal – Check for objects blocking the
AP sensor or pedal arm with spring, excessive
deposits in the acceleration pedal arm and on the
acceleration pedal and lacking the pedal stopper
rabber.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
2. Visually/physically inspect for the following throttle
valve conditions.
3. Visually/physically inspect for the following
acceleration pedal conditions.
5. Check the following circuits for throttle valve and DC
moter. Check the following TP sensor resistance
and DC motor.
6. Check the following circuits for acceleration pedal.
Check the following AP sensor resistance.
7. Following DTC: Error for ETC system.
Electric Throttle Control (ETC) System Check
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
Visually/physically inspect for the following conditions:
D
Throttle body tampering.
D
Restricted intake throttle system. Check for a
possible collapsed air intake duct, restricted air
filter element, or foreign objects blocking the air
intake system.
D
Throttle body: Check for objects blocking the
throttle passage or throttle bore, excessive
deposits in the throttle passage and on the throttle
valve, and excessive deposits in the throttle bore
and on the throttle plate.
D
Throttle body with lever: When check for objects
to send round the throttle spring lever that lever is
smooth movement by less than 9 l·bm{1.0 N·m},
and spring lever has not excessive play.
D
Throttle function: Check for the throttle function.
When ignition switch “ON” that throttle lever is
smooth operated by step on the acceleration
pedal.
Did any of the above require a repair?
—
Refer to
appropriate
section for
on-vehicle
service
Go to
Step 3