Opel Frontera UBS. Manual - part 2355

6E–456

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Hard Start Symptom

 

Step

Action

Value(s)

Yes

No

1

DEFINITION:
Engine cranks, but does not start for a long time.  Does
eventually run, or may start but immediately stall.

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

Was the “Electric Throttle Control (ETC) System
Check” performed?

—

Go to 

Step 3

Go to 

ETC

System

Check

3

1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,

correct the condition as instructed in the bulletin.

Was a bulletin found that addresses the symptom?

—

Verify repair

Go to 

Step 4

4

Was a visual/physical check performed?

—

Go to 

Step 5

Go to 

Visual/

Physical

Check

5

Check engine coolant temperature (ECT) sensor for
shift in value.  After 8 hours with the hood up and the
engine not running, connect the Tech 2.  With the
ignition “ON” and the engine not running, compare
engine coolant temperature to intake air temperature.

Are ECT and IAT within the specified value of each
other?

±

 5

°

C (

±

 9

°

F)

Go to 

Step 9

Go to 

Step 6

6

1. Using a Tech 2, display the engine coolant

temperature and note the value.

2. Check the resistance of the engine coolant

temperature sensor.

3. Refer to 

Engine Coolant Temperature Sensor

Temperature vs. Resistance chart on DTC P0118
Diagnostic Support for resistance specifications.

Is the resistance value near the resistance for the
temperature noted?

—

Go to 

Step 8

Go to 

Step 7

7

Replace the ECT sensor.

Is the action complete?

—

Verify repair

—

8

Locate and repair high resistance or poor connection in
the ECT signal circuit or the ECT sensor ground.

Is the action complete?

—

Verify repair

—

9

1. Check for a faulty, plugged, or incorrectly installed

PCV valve.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 10

10

1. Check for water- or alcohol-contaminated fuel.
2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 11

11

1. Perform the procedure in 

Fuel System Pressure

Test.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 12

6E–457

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Hard Start Symptom

  (Cont'd)

Step

No

Yes

Value(s)

Action

12

1. Check for proper ignition voltage output with spark

tester J 26792 (ST-125).  Refer to 

Electric Ignition

System for procedure.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 13

13

1. Remove spark plugs.  Check for wet plugs, cracks,

wear, improper gap, burned electrodes, or heavy
deposits.  Refer to 

Electronic Ignition System.

NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 14

14

1. Check for a loose ignition coil ground and ION

Sensing module circuit.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 15

15

1. Remove the ignition coils and check the ignition

coils for cracks or carbon tracking.

2. If a problem is found, replace affected coil(s) as

necessary.

Was a problem found?

—

Verify repair

Go to 

Step 16

16

1. Check for the following engine mechanical

problems (refer to 

Engine Mechanical):

D

Low compression

D

Leaking cylinder head gaskets

D

Worn or incorrect camshaft

D

Camshaft drive belt slipped or stripped

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 17

17

1. Review all diagnostic procedures within this table.
2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

D

Visual/physical inspection

D

Tech 2 data

D

Freeze Frame data/Failure Records buffer

D

All electrical connections within a suspected
circuit and/or system.

3. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Contact

Technical

Assistance

6E–458

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Surges and/or Chuggles Symptom

 

Step

Action

Value(s)

Yes

No

1

DEFINITION:
Engine power variation under steady throttle or cruise.
Feels like the vehicle speeds up and slows down with
no change in the accelerator pedal.

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

Was the “Electric Throttle Control (ETC) System
Check” performed?

—

Go to 

Step 3

Go to 

ETC

System

Check

3

1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,

correct the condition as instructed in the bulletin.

Was a bulletin found that addresses the symptom?

—

Verify repair

Go to 

Step 4

4

Was a visual/physical check performed?

—

Go to 

Step 5

Go to 

Visual/

Physical

Check

5

Be sure that the driver understands transmission
torque converter clutch and A/C compressor operation
as explained in the owner’s manual.
Inform the customer how the TCC and the A/C clutch
operate.

Is the customer experiencing a normal condition?

—

System OK

Go to 

Step 6

6

1. Check the fuel control heated oxygen sensors

(HO2S, B1S1 and B2S1).  The fuel control heated
oxygen sensors (HO2S) should respond quickly to
different throttle positions.  If they don’t, check them
for silicone or other contaminants from fuel or use of
improper RTV sealant.  The sensors may have a
white powdery coating.

Silicon contamination causes a high but false
HO2S signal voltage (rich exhaust indication).
The PCM will then reduce the amount of fuel
delivered to the engine, causing a severe
driveability problem.  For more information, refer
to 

Powertrain Control Module (PCM) and Sensors.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 7

7

1. Check the fuel pressure.  Refer to 

Fuel System

Pressure Test.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 8

8

Monitor the long term fuel trim on the Tech 2.

Is the long term fuel trim significantly in the negative
range (rich condition)?

—

Go to 

Step 9

Go to 

Step 10

9

1. Check items that can cause the engine to run rich.

Refer to 

Diagnostic Aids in DTC P0172 Diagnostic

Support.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Go to 

Step 11

Verify repair

6E–459

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Surges and/or Chuggles Symptom

  (Cont'd)

Step

No

Yes

Value(s)

Action

10

1. Check items that can cause the engine to run lean.

Refer to 

Diagnostic Aids in DTC P0171.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Go to 

Step 11

Verify repair

11

1. Check for proper ignition voltage output with spark

tester J 26792 (ST-125).  Refer to 

Electric Ignition

System for procedure.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 12

12

1. Check for a loose ignition coil ground and ION

Sensing module circuit.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 13

13

1. Check the ignition coils for cracks or carbon

tracking.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 15

14

1. Remove the spark plugs and check for wet plugs,

cracks, wear, improper gap, burned electrodes, or
heavy deposits.  Refer to 

Electronic Ignition

System.

NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 15

15

1. Check the injector connections.
2. If any of the injector connectors are connected to an

incorrect cylinder, correct as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 16

16

1. Check PCM grounds for the cleanliness, tightness

and proper locations.  Refer to the PCM wiring
diagrams in 

Electrical Diagnosis.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 17

17

1. Check MAF sensor connections.
2. If a problem is found, replace the faulty terminals as

necessary.  Refer to 

Electrical Diagnosis for wiring

repair procedures.

Was a problem found?

—

Verify repair

Go to 

Step 18

18

1. Visually/physically check vacuum hoses for splits,

kinks, and proper connections and routing as
shown on the “Vehicle Emission Control
Information” label.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 19