Opel Frontera UBS. Manual - part 1179

6E–82

ENGINE DRIVEABILITY AND EMISSIONS

Engine Cranks But Will Not Run

  (Cont'd)

Step

No

Yes

Value(s)

Action

13

1. Remove any ignition coil and install a spark tester at

the spark plug end of the coil.

2. Observe the tester while the engine is cranking.

Was a crisp, blue spark observed?  Only one or two
sparks followed by no result is considered the same as
“No Spark.”

—

Go to 

Step 15

Go to 

Step 14

14

Replace the ignition coil, and return to Step 13 to test
the remaining coils.

Is the action complete?

—

Verify repair

—

15

Repeat Step 13 for each coil.  Remove only one coil at a
time, and reinstall each coil on its spark plug after
testing, but do not refasten coils with screws at this
time.

After all coils have passed the spark test, does the
engine start?

—

Refasten all

coils with

their screws

Go to 

Step 16

16

1. Remove the spark plugs from all cylinders.
2. Visually inspect the spark plug electrodes.
3. Replace any spark plugs with loose or missing

electrodes or cracked insulators.

Did your inspection reveal any spark plugs exhibiting
excessive fouling?

—

Correct the

fouling

condition

Go to 

Step 17

17

Refer to 

Engine Mechanical Diagnosis to diagnose the

following conditions:

D

Faulty or incorrect camshaft drive belts

D

Leaking or sticky valves or rings

D

Excessive valve deposits

D

Loose or worn rocker arms

D

Weak valve springs

D

Incorrect valve timing

D

Leaking head gasket

Is the action complete?

—

Verify repair

Go to 

Step 19

18

Observe the “Engine Speed” data display on the scan
tool while cranking the engine.

Is the engine RPM indicated?  (If the scan tool is
normally powered from the cigarette lighter socket, and
if the scan tool display goes blank while cranking the
engine, it will be necessary to power the scan tool
directly from the vehicle battery.)

—

Go to 

Step 19

Go to 

Step 28

19

1. Disconnect the 7-pin gray connector at the rear of

the air filter beneath the point where the air duct
attaches to the MAF sensor.

2. Ignition “ON.”
3. Using a test light connected to ground, probe the

ignition terminal at the PCM (female) side of the
7-pin connector.

Is the test light “ON?”

—

Go to 

Step 20

Go to 

Step 26

6E–83

ENGINE DRIVEABILITY AND EMISSIONS

Engine Cranks But Will Not Run

  (Cont'd)

Step

No

Yes

Value(s)

Action

20

1. At the PCM (female) side of the connector, connect

a test light between the ignition + terminal and one
of the injector driver circuits at the same connector.

2. Ignition “ON.”
3. Observe the test light, and repeat the test for each

injector driver circuit.

Did the test light stay on when checking any of the 6
injector driver circuits?

—

Go to 

Step 21

Go to 

Step 23

21

1. Ignition “OFF,” disconnect the PCM.
2. Ignition “ON,” observe the test light.

Is the test light “ON?”

—

Go to 

Step 22

Go to 

Step 27

22

Locate and repair the short to ground in the injector
driver circuit.

Is the action complete?

—

Verify repair

—

23

1. Using the same test location as in step 20, connect

a test light between the ignition terminal and one of
the driver circuits.

2. Crank the engine and observe the test light.
3. Repeat for each injector driver circuit.

Did the light blink during the test for each circuit?

—

Go to 

Step 25

Go to 

Step 24

24

Check for an open injector driver circuit.

Was a problem found?

—

Verify repair

Go to 

Step 27

25

1. At the injector (male) side of the gray connector,

connect an ohmmeter between the ignition pin and
one of the driver circuit pins.

2. Check for continuity in the circuit.
3. Repeat for each injector circuit.  The readings

should be approximately equal to the  specified
value for injector resistance.

Was a problem found?

12.5 ohms

Verify repair

Go to 

Step 8

26

Repair the ignition feed circuit.

Is the action complete?

—

Verify repair

—

27

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed. Refer to 

UBS 98model year Immobilizer

Workshop Manual.

Is the action complete?

—

Verify repair

—

28

1. Raise the vehicle and disconnect the CKP sensor

harness.

2. Ignition “ON.”
3. With a test light to ground, probe the harness

ignition feed terminal.

Did the light illuminate?

—

Go to 

Step 30

Go to 

Step 29

29

Check the ignition feed wire between the sensor and
the PCM for a short to ground or open circuit.

Is the action complete?

—

Verify repair

—

6E–84

ENGINE DRIVEABILITY AND EMISSIONS

Engine Cranks But Will Not Run

  (Cont'd)

Step

No

Yes

Value(s)

Action

30

1. Ignition “ON.”
2. At the CKP harness connector, connect a test light

between the ignition and ground terminals.

Did the light illuminate?

—

Go to 

Step 32

Go to 

Step 31

31

Check the sensor ground circuit for an open or short to
voltage.

Is the action complete?

—

Verify repair

—

32

Check the signal circuit between the sensor and the
PCM for a short to ground, short to voltage, or an open.

Was a problem found?

—

Verify repair

Go to 

Step 33

33

Replace the CKP sensor.

Is the action complete?

—

Verify repair

Go to 

Step 27

6E–85

ENGINE DRIVEABILITY AND EMISSIONS

Fuel System Electrical Test

D06RW101

Circuit Description

When the ignition switch is first turned “ON,” the
powertrain control module (PCM) energizes the fuel
pump relay which applies power to the in-tank fuel pump.
The fuel pump relay will remain “ON” as long as the
engine is running or cranking and the PCM is receiving
58X crankshaft position pulses.  If no 58X crankshaft
position pulses are present, the PCM de-energizes the
fuel pump relay within 2 seconds after the ignition is
turned “ON” or the engine is stopped.
The fuel pump delivers fuel to the fuel rail and injectors,
then to the fuel pressure regulator.  The fuel pressure
regulator controls fuel pressure by allowing excess fuel to
be returned to the fuel tank.  With the engine stopped and
ignition “ON,” the fuel pump can be turned “ON” by using a
command by Tech 2.

Diagnostic Aids

An intermittent may be caused by a poor connection,
rubbed-through wire insulation, or a wire broken inside
the insulation.  Check for the following items:

D

Poor connection or damaged harness – Inspect the
PCM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal-to-wire connection, and
damaged harness.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. If the fuel pump is operating but incorrect pressure is

noted, the fuel pump wiring is OK and the “Fuel
System Pressure Test” chart should be used for
diagnosis.