Opel Frontera UE. Manual - part 1471

6E–99

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Circuit Description

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.

The accelerator position (AP1) sensor circuit
provides a voltage signal relative to accelerator pedal
angle.
The accelerator 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

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.

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.

Accelerator pedal – Check for objects blocking the AP
sensor or pedal arm with spring, and excessive
deposits in the accelerator pedal arm and on the
accelerator pedal.

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

accelerator pedal conditions.

5. Check the following circuits for throttle valve and DC

motor. Check the following TP sensor resistance
and DC motor.

7. Check the following circuits for accelerator pedal.

Check the following AP sensor resistance.

10. Following DTC: Software detect Error for ETC

system.

11. Following DTC: Software detect Error for ETC

system.

SECTION

6E–100

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Electric Throttle Control (ETC) System Check

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to

Step 2

Go to

OBD

System

Check

Visually/physically inspect for the following conditions:

Throttle body tampering.

Restricted intake throttle system. Check for a
possible collapsed air intake duct, restricted air
filter element, or foreign objects blocking the air
intake system.

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.

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.

Throttle function: Check for the throttle function.
When ignition switch “ON” that throttle lever is
smooth operated by step on the accelerator
pedal.

Did any of the above require a repair?

—

Refer to

appropriate

section for

on-vehicle

service

Go to

Step 3

Visually/physically inspect for the following conditions:

Accelerator pedal tampering.

Accelerator pedal : Check for objects blocking the
spring or pedal arm.

Accelerator pedal : For check for objects to move
the accelerator pedal that pedal is smooth
movement, and accelerator pedal arm has not
excessive play.

Did any of the above require a repair?

—

Refer to

appropriate

section for

on-vehicle

service

Go to

Step 4

1. Check for a poor connection at the throttle body

harness connector.

2. Check for a poor connection at the accelerator

position sensor harness connector.

3. If a problem is found, replace faulty terminals as

necessary.

Was a problem found?

—

Verify repair

Go to

Step 5

Check the following circuits for an open, short to
voltage, short to ground, or poor connection at the
PCM:

Throttle position sensor 1 circuit.

Throttle position sensor 2 circuit.

Throttle DC motor circuit.

Throttle position sensor resistance.

Throttle DC motor resistance.

If a problem is found, repair as necessary.

Was a problem found?

Vcc–GND

1–7k

SIG–GND

change

resistance

0.3–100

Verify repair

Go to

Step 6

SECTION

6E–101

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Electric Throttle Control (ETC) System Check

(Cont'd)

Step

Yes

Value(s)

Action

1. Install the Tech 2
2. Ignition “ON” but not engine run.
3. Chech the valve for APS and TPS.

Was the problem found?

Idle AP1 =

11–13% AP2

= 87–88%

AP3 =

87–88% TP1

= 1–6% TP2

= 1–6% WOT

AP1 =

85–89% AP2

= 11–15%

AP3 =

32–36% TP1

= 98–100%

TP2 =

98–100%

Go to

Step 10

Go to

Step 7

Replace the throttle valve.

Is the action complete?

—

Go to

Step 8

—

Check the following circuits for an open, short to
voltage, short to ground, or poor connection at the
PCM:

Accelerator position sensor 1 circuit.

Accelerator position sensor 2 circuit.

Accelerator position sensor 3 circuit.

Accelerator position sensor resistance.

If a problem is found, repair as necessary.

Was a problem found?

Vcc–GND

4–6k

SIG–GND

change

resistance

Verify repair

Go to

Step 9

Replace the accelerator position sensor.

Is the action complete?

—

Go to

Step 10

–

Following below the DTCs stored:
P1125, P1290, P1295, P1299

—

Go to

applicable

DTC chart

Go to

Step 11

Following below the DTCs stored:
P1514, P1515, P1516, P1523, P1271, P1272, P1273

—

Go to

applicable

DTC chart

Go to

Step 12

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed. Refer to

On-Vehicle Service in

Powertrain Control Module and Sensors for
procedures.

And also refer to latest Service Bulletin.

Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.

Is the action complete?

—

Verify repair

—

SECTION

6E–102

6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Fuel System Diagnosis

060R100121

SECTION

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