Opel Frontera UE. Manual - part 263

6A–16

ENGINE MECHANICAL (6VD1 3.2L)

Condition

Correction

Possible cause

Others

Improper oil viscosity

Use oil of recommended S.A.E.
viscosity

Continuous high speed driving
and/or severe usage such as trailer
towing

Continuous high speed operation
and/or severe usage will normally
cause increased oil consumption

Fuel Consumption Excessive

Condition

Possible cause

Correction

Trouble in fuel system

Mixture too rich or too lean due to
trouble in fuel injection system

Refer to “Abnormal Combustion”

Fuel cut function does not work

Refer to “Abnormal Combustion”

Trouble in ignition system

Misfiring or abnormal combustion
due to trouble in ignition system

Refer to “Hard Start” or “Abnormal
Combustion”

Others

Engine idle speed too high

Reset Idle Air Control Valve

Returning of accelerator control
sluggish

Correct

Fuel system leakage

Correct or replace

Clutch slipping

Correct

Brake drag

Correct

Selection of transmission gear
incorrect

Caution operator of incorrect gear
selection

Excessive Exhaust Gas
Recirculation (EGR) flow due to
trouble in EGR system

Refer to “Abnormal Combustion”

Lubrication Problems

Condition

Possible cause

Correction

Oil pressure too low

Wrong oil in use

Replace with correct engine oil

Relief valve sticking

Replace

Oil pump not operating properly

Correct or replace

Oil pump strainer clogged

Clean or replace strainer

Oil pump worn

Replace

Oil pressure gauge defective

Correct or replace

Crankshaft bearing or connecting
rod bearing worn

Replace

Oil contamination

Wrong oil in use

Replace with correct engine oil

Oil filter clogged

Replace oil filter

Cylinder head gasket damage

Replace gasket

Burned gases leaking

Replace piston and piston rings or
cylinder body assembly

Oil not reaching valve system

Oil passage in cylinder head or
cylinder body clogged

Clean or correct

6A–17

ENGINE MECHANICAL (6VD1 3.2L)

Engine Oil Pressure Check

1. Check for dirt, gasoline or water in the engine oil.

a. Check the viscosity of the oil.
b. Change the oil if the viscosity is outside the

specified standard.

c. Refer to the “Maintenance and Lubrication” section

of this manual.

2. Check the engine oil level.

The level should fall somewhere between the “ADD”
and the “FULL” marks on the oil level dipstick.
If the oil level does not reach the “ADD” mark on the
oil level dipstick, engine oil must be added.

3. Remove the oil pressure unit.
4. Install an oil pressure gauge.
5. Start the engine and allow the engine to reach normal

operating temperature (About 80

°

C).

6. Measure the oil pressure.

Oil pressure should be:

392–550 kPa (56.9–80.4  psi) at 3000 rpm.

7. Stop the engine.
8. Remove the oil pressure gauge.
9. Install the oil pressure unit.

10. Start the engine and check for leaks.

Malfunction Indicator Lamp

The instrument panel “CHECK ENGINE” Malfunction In-
dicator Lamp (MIL) illuminates by self diagnostic system

when the system checks the starting of engine, or senses
malfunctions.

Condition

Possible cause

Correction

“CHECK ENGINE” MIL does not
illuminate at the starting of engine

Bulb defective

Replace

illuminate at the starting of engine

MIL circuit open

Correct or replace

Command signal circuit to operate
self diagnostic system shorted

Correct or replace

Powertrain Control Module (PCM)
cable loosely connected,
disconnected or defective

Correct or replace

PCM defective

Replace

6A–18

ENGINE MECHANICAL (6VD1 3.2L)

Condition

Correction

Possible cause

“CHECK ENGINE” MIL illuminates,
and stays on

Deterioration of heated oxygen
sensor internal element

Replace

Heated oxygen (O

2

) sensor

connector terminal improper contact

Reconnect properly

O

2

 sensor lead wire shorted

Correct

O

2

 sensor circuit open

Correct or replace

Deterioration of Engine Coolant
Temperature (ECT) sensor internal
element

Replace

ECT sensor connector terminal
improper contact

Reconnect properly

ECT sensor lead wire shorted

Correct

ECT sensor circuit open

Correct or replace

Throttle position sensor open or
shorted circuits

Correct or replace

Deterioration of crankshaft position
sensor

Replace

Crankshaft position sensor circuit
open or shorted

Correct or replace

Vehicle speed sensor circuit open

Correct or replace

Manifold absolute pressure sensor
circuit open or shorted

Correct or replace

Intake air temperature sensor circuit
open or shorted

Correct or replace

Fuel injector circuit open or shorted

Correct or replace

PCM driver transistor defective

Replace PCM

Malfunctioning of PCM RAM
(Random Access Memory) or ROM
(Read Only Memory)

Replace PCM

6A–19

ENGINE MECHANICAL (6VD1 3.2L)

Cylinder Head Cover LH

Removal

1. Disconnect battery ground cable.
2. Drain engine coolant from faucet bottom of radiator.
3. Remove engine cover from the dowels on the

common chamber.

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4. Remove air cleaner duct assembly (3) and air cleaner

element (4).

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Legend

(1) Positive Crankcase Ventilation Hose Connector
(2) Intake Air Temperature Sensor
(3) Air Cleaner Duct Assembly
(4) Air Cleaner Element
(5) Mass Air Flow Sensor

NOTE: Disconnect the mass air flow (MAF) sensor
connector, intake air temperature (IAT) sensor connector,
and positive crankcase ventilation (PCV) hose before
hand the air cleaner duct assembly is removed.

5. Disconnect following wiring connectors and bonding

cable:

D

Manifold Absolute Pressure (MAP) sensor

D

Vacuum Switching Valve (VSV) for Induction Air
Control Valve (IACV) actuator

D

Ignition coils for left bank

D

Fuel injectors for left bank

D

Idle air control (IAC) valve

D

Throttle position sensor (TPS)

D

Bonding cable

D

Others as necessitated

6. Disconnect following vacuum hoses:

D

Brake master VAC

D

Canister

D

VSV for IACV actuator

D

Duty solenoid valve

D

PCV

7. Disconnect radiator upper and lower hoses
8. Remove engine harness from the cylinder head

cover.

9. Remove the upper fan guide.

10. Remove cooling fan and clutch assembly.

11. Remove drive belt by pushing down the auto

tensioner using spanner as illustrated.

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