Opel Frontera UBS. Manual - part 2204

 

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Opel Frontera UBS. Manual - part 2204

 

 

6A–6

ENGINE MECHANICAL (6VE1 3.5L)

Rough Engine Idling or Engine Stalling

Condition

Possible cause

Correction

Trouble in fuel injection system

Throttle valve defective

Correct or replace

Throttle position sensor circuit open
or shorted

Correct or replace

Fuel injector circuits open or shorted

Correct or replace

Fuel injectors damaged

Replace

Fuel pump relay defective

Replace

Mass Airflow Sensor circuit open or
poor connections

Correct or replace

Mass Airflow Sensor defective

Replace

Manifold Absolute Pressure Sensor
circuit open or poor connections

Correct or replace

Manifold Absolute Pressure Sensor
defective

Replace

Engine Coolant Temperature Sensor
circuit open or poor connections

Correct or replace

Engine Coolant Temperature Sensor
defective

Replace

Intake Air Temperature sensor circuit
open or poor connections

Correct or replace

Intake Air Temperature sensor
defective

Replace

Ion Sensing Module cable broken or
poor connections

Correct or replace

Ion Sensing Module defective

Replace

Vehicle Speed Sensor circuit open or
shorted

Correct or replace

Vehicle Speed Sensor defective

Replace

Trouble in emission control system

Powertrain Control Module defective

Replace

Exhaust Gas Recirculation Valve
circuit open or poor connections

Correct or replace

Exhaust Gas Recirculation Valve
faulty

Replace

Canister purge valve circuit open or
poor connections

Correct or replace

Canister purge valve defective

Replace

Trouble in ignition system

Refer to “Hard Start”

Others

Engine lacks compression

Refer to “Hard Start”

Valve incorrectly seated

Lap valve

Air Cleaner Filter clogged

Replace filter element

Valve timing incorrect

Readjust

Positive Crankcase Ventilation valve
defective or clogged

Replace

6A–7

ENGINE MECHANICAL (6VE1 3.5L)

Rough Engine Running

Condition

Possible cause

Correction

Engine misfires periodically

Ignition coil layer shorted

Replace

Spark plugs fouling

Clean or install hotter type plug

Spark plug(s) insulator nose leaking

Replace

Ion sensing module or ION sensing
module circuits defective

Correct or replace

Fuel injector(s) defective

Replace

Powertrain control module faulty

Replace

Engine knocks periodically

Spark plugs running too hot

Install colder type spark plugs

Powertrain control module faulty

Replace

Ion Sensing module or ION sensing
module circuits defective

Correct or replace

Engine lacks power

Spark plugs fouled

Clean

Fuel injectors defective

Replace

Mass Airflow Sensor or Intake
Airflow Sensor circuit defective

Correct or replace

Manifold Absolute Pressure (MAP)
Sensor or Manifold Absolute
Pressure Sensor circuit defective

Correct or replace

Engine Coolant Temperature Sensor
or Engine Coolant Temperature
Sensor circuit defective

Correct or replace

Powertrain Control Module faulty

Replace

Intake Air Temperature Sensor or
Intake Air Temperature Sensor
circuit defective

Correct or replace

Throttle Position Sensor or Throttle
Position Sensor circuit defective

Correct circuit or replace throttle
valve ASM

ION Sensing Module or ION Sensing
Module circuits defective

Correct or replace

6A–8

ENGINE MECHANICAL (6VE1 3.5L)

Hesitation

Condition

Possible cause

Correction

Hesitation on acceleration

Throttle Position Sensor adjustment
incorrect

Replace throttle valve assembly

Throttle Position Sensor circuit open
or shorted

Correct or replace

Mass Airflow Sensor circuit open or
poor connections

Correct or replace

Mass Airflow Sensor defective

Replace

Manifold Absolute Pressure (MAP)
Sensor circuit open or shorted

Correct or replace

MAP Sensor defective

Replace

Intake Air Temperature (IAT) Sensor
circuit open or poor connections

Correct or replace

Ion Sensing Module circuit open or
poor connections

Correct or replace

Ion Sensing Module defective

Replace

IAT Sensor defective

Replace

Hesitation at high speeds

Fuel tank strainer clogged

Clean or replace

(Fuel pressure too low)

Fuel pipe clogged

Clean or replace

Fuel filter clogged

Replace

Defective fuel pump system

Check and replace

Fuel Pressure Control Valve leaking

Replace

Hesitation at high speeds
(Fuel injector not working normally)

Power supply or ground circuit for
Multiport Fuel Injection System
shorted or open

Check and correct or replace

Fuel Injector defective

Replace

Cable of Multiport Fuel Injection
System circuit open or poor
connections

Correct or replace

6A–9

ENGINE MECHANICAL (6VE1 3.5L)

Condition

Correction

Possible cause

Hesitation at high speeds

Powertrain Control Module defective

Replace

Throttle Position Sensor cable
broken or poor connections

Correct cable or replace throttle
valve ASM

Throttle Position Sensor defective

Replace throttle valve ASM

Engine Coolant Temperature Sensor
circuit open or shorted

Correct or replace

Engine Coolant Temperature Sensor
defective

Replace

Mass Airflow Sensor circuit open or
poor connections

Correct or replace

Mass Airflow Sensor defective

Replace

MAP Sensor cable broken or poor
connections

Correct or replace

MAP Sensor defective

Replace

IAT Sensor circuit open or poor
connections

Correct or replace

IAT Sensor defective

Replace

Ion Sensing Module circuit open or
poor connections

Correct or replace

Ion Sensing Module defective

Replace

Throttle valve not fully opened

Check and correct or replace

Air Cleaner Filter clogged

Replace filter element

Power supply voltage too low

Check and correct or replace

 

 

 

 

 

 

 

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