Opel Frontera UBS. Manual - part 2374

 

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Opel Frontera UBS. Manual - part 2374

 

 

6E–532

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Linear EGR Valve

The main element of the system is the linear EGR valve.
The EGR valve feeds small amounts of exhaust gas back
into the combustion chamber.  The fuel/air mixture will be
diluted and combustion temperatures reduced.

Linear EGR Control

The PCM monitors the EGR actual positron and adjusts
the pintle position accordingly.  The uses information from
the following sensors to control the pintle position:

D

Engine coolant temperature (ECT) sensor.

D

Throttle position (TP) sensor.

D

Mass air flow (MAF) sensor.

Linear EGR Valve Operation and Results
of Incorrect Operation

The linear EGR valve is designed to accurately supply
EGR to the engine independent of intake manifold
vacuum.  The valve controls EGR flow from the exhaust
to the intake manifold through an orifice with a PCM
controlled pintle.  During operation, the PCM controls
pintle position by monitoring the pintle position feedback
signal.   The feedback signal can be monitored with a Tech
2 as “Actual EGR Pos.” “Actual EGR Pos.” should always
be near the commanded EGR position (”Desired EGR
Pos.”).  If a problem with the EGR system will not allow the
PCM to control the pintle position properly, DTC P1406
will set.  The PCM also tests for EGR flow.  If incorrect flow
is detected, DTC P0401 will set.  If DTCs P0401 and/or
P1406 are set, refer to the DTC charts.
The linear EGR valve is usually activated under the
following conditions:

D

Warm engine operation.

D

Above-idle speed.

Too much EGR flow at idle, cruise or cold operation may
cause any of the following conditions to occur:

D

Engine stalls after a cold start.

D

Engine stalls at idle after deceleration.

D

Vehicle surges during cruise.

D

Rough idle.

D

DTC P0300 (misfire detected).

Too little or no EGR flow may allow combustion
temperatures to get too high.  This could cause:

D

Spark knock (detonation).

D

Engine overheating.

D

Emission test failure.

D

DTC P0401 (EGR flow test).

D

Poor fuel economy.

0017

EGR Pintle Position Sensor

The PCM monitors the EGR valve pintle position input to
endure that the valve responds properly to  commands
from the PCM and to detect a fault if the pintle position
sensor and control circuits are open or shorted.  If the
PCM detects a pintle position signal voltage outside the
normal range of the pintle position sensor, or a signal
voltage that is not within a tolerance considered
acceptable for proper EGR system operation, the PCM
will set DTC P1406.

General Description (Positive
Crankcase Ventilation (PCV) System)

Crankcase Ventilation System Purpose

The crankcase ventilation system is use to consume
crankcase vapors in the combustion process instead of
venting them to the atmosphere.  Fresh air from the
throttle body is supplied to the crankcase and mixed with
blow-by gases.  This mixture is then passed through the
positive crankcase ventilation (PCV) valve into the
common chamber.

Crankcase Ventilation System Operation

The primary control is through the positive crankcase
ventilation (PCV) valve.  The PCV valve meters the flow at
a rate that depends on the intake vacuum.  The PCV valve
restricts the flow when the inlet vacuum is highest.  In
addition, the PCV valve can seal the common chamber
off in case of sudden high pressure in the crankcase.

6E–533

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

060R200198

While the engine is running, exhaust fuses and small
amounts of the fuel/air mixture escape past the piston
rings and enter the crankcase.  These gases are mixed
with clean air entering through a tube from the air intake
duct.

060R200063

During normal, part-throttle operation, the system is
designed to allow crankcase gases to flow through the
PCV valve into the throttle body to be consumed by
normal combustion.
A plugged valve or PCV hose may cause the following
conditions:

D

Rough idle.

D

Stalling of slow idle speed.

D

Oil leaks.

D

Sludge in the engine.

A leaking PCV hose would cause:

D

Rough idle.

D

Stalling.

D

High idle speed.

6E–534

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Special Tools

ILLUSTRATION

TOOL NO.

TOOL NAME

5-8840-0285-0

(J 39200)

High Impedance

Multimeter (Digital

Voltmeter – DVM)

(1) PCMCIA Card

(2) RS232 Loop Back

Connector

(3) SAE 16/19 Adapter

(4) DLC Cable

(5) TECH–2

5-8840-0607-0

(J 34142-B)

Unpowered Test Light

5-8840-0385-0

(J 35616-A/BT-8637)

Connector Test Adapter

Kit

5-8840-0383-0

(J 26792/BT-7220-1)

Spark Tester

5-8840-0279-0

(J 23738-A)

Vacuum Pump with

Gauge or common tool

ILLUSTRATION

TOOL NO.

TOOL NAME

BT-8515

Exhaust Back Pressure

Tester or common tool

5-8840-2640-0

(J 39194-B)

Heated Oxygen Sensor

Wrench

5-8840-0632-0

(J 35689-A)

Terminal Remover

5-8840-0388-0

(J 28742-A)

Weather Pack II

Terminal Remover

5-8840-2635-0

(J 39021-90)

Injector Switch Box

5-8840-2636-0

(J 39021-65)

Injector Test Light

6F–1

ENGINE EXHAUST

ENGINE

ENGINE EXHAUST

CONTENTS

General Description

6F–2

. . . . . . . . . . . . . . . . . . . . . 

Front Exhaust Pipe

6F–3

. . . . . . . . . . . . . . . . . . . . . . 

Front Exhaust Pipe and Associated Parts

6F–3

Removal

6F–3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6F–3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Three Way Catalytic Converter LH

6F–4

. . . . . . . . . 

Removal

6F–4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6F–4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Three Way Catalytic Converter RH

6F–5

. . . . . . . . 

Removal

6F–5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6F–5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Exhaust Silencer

6F–6

. . . . . . . . . . . . . . . . . . . . . . . . 

Exhaust Silencer and Associated Parts

6F–6

. . . 

Removal

6F–6

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6F–7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Rear Exhaust pipe

6F–8

. . . . . . . . . . . . . . . . . . . . . . . 

Rear Exhaust pipe and Associated Parts

6F–8

Removal

6F–8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6F–8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Main Data and Specifications

6F–9

. . . . . . . . . . . . . 

SECTION

 

 

 

 

 

 

 

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