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Opel Frontera UBS. Manual - part 2303

6E–248

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

DTC P0300 – Engine Misfire Detected

(Cont'd)

Step

Yes

Value(s)

Action

1. Install a spark tester at the spark plug end of the

ignition coil for a cylinder that indicated a misfire.

2. Crank the engine while observing the spark tester.

A crisp, blue spark should be observed.

Is adequate spark present?

—

Go to

Step 14

Go to

Step 9

1. Remove and visually/physically inspect the ignition

coil(s) associated with the cylinders that were
indicated as misfiring. Ensure that the coil(s) are
free of cracks.

2. If a problem is found, replace the damaged ignition

coil(s) as necessary.

Did any ignition coils require replacement?

—

Verify repair

Go to

Step 10

1. Remove the spark plugs from the cylinders that

were indicated as misfiring.

2. Visually inspect the spark plug electrodes.

Does your inspection reveal any spark plugs exhibiting
excessive fouling?

—

Go to

Engine

Mechanical

Diagnosis

Go to

Step 11

1. Visually inspect the spark plug insulators for cracks,

carbon tracking, or other damage.

2. If a problem is found, replace the faulty spark

plug(s) as necessary.

Did your inspection reveal a problem?

—

Verify repair

Go to

Step 12

1. Disconnect the MAF sensor electrical connector.
2. Operate the vehicle in “closed loop” while

monitoring the “BANK 1 L.T. FUEL TRIM” and
“BANK 1 S.T. FUEL TRIM” display on the Tech 2.

Do both values decrease below the specified values?

”BANK 1 L.T.

FUEL TRIM”

below +20%;

“BANK 1 S.T.

FUEL TRIM”

below +50%

Go to

Step 13

Replace the

ignition coil of

the affected

cylinder

Replace the ignition coil control module.

Is the action complete?

—

Verify repair

—

1. Visually and physically inspect the PCM injector

grounds, power grounds and sensor grounds to
ensure that they are clean, tight and in their proper
locations.

2. If a problem is found, correct the faulty ground

condition as necessary.

Did your inspection reveal a poor ground?

—

Verify repair

Go to

Step 15

1. Perform the “Fuel System Pressure Test”

procedure.

2. If a problem is found, repair as necessary (refer to

Engine Fuel or Fuel Metering System).

Was a fuel system problem found?

—

Verify repair

Go to

Step 16

1. Check the fuel for excessive water, alcohol, or other

contaminants (refer to

Diagnosis in Engine Fuel for

procedure).

2. If a problem is found, correct the contaminated fuel

condition as necessary.

Was the fuel contaminated?

—

Verify repair

Go to

Step 17

6E–249

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

DTC P0300 – Engine Misfire Detected

(Cont'd)

Step

Yes

Value(s)

Action

1. Perform the “Injector Coil/Balance Test”.
2. If a problem is found, replace faulty injector(s) as

necessary.

Did any of the injectors require replacement?

—

Verify repair

Go to

Step 18

1. Check for an engine mechanical problem. Refer to

Engine Mechanical Diagnosis to diagnose the
following conditions:

A faulty or incorrect camshaft

Leaking or sticky valves or rings

Excessive valve deposits

Weak valve springs

Incorrect valve timing

A leaking head gasket

A loose or broken motor mount

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

Was a basic engine mechanical problem found and
repaired?

—

Verify repair

Go to

Step 19

1. Check for a transmission TCC problem. Refer to

4L30-E Automatic Transmission Diagnosis.

2. If a problem is found, repair the transmission as

necessary. Refer to

4L30-E Automatic

Transmission Unit Repair.

Was a transmission problem found and repaired?

—

Verify repair

Go to

Step 20

Replace the MAF sensor.

Is the action complete?

—

Verify repair

—

6E–250

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC)

P0325 ION Sensing Module/ION Sensing Knock Intensity Circuit Fault

D06R200098

Circuit Description

The Power Control Module (PCM) checks the validity of
the signals used in the ION Sensing module at the
following engine operating conditions.

The test is performed to evacuate the Knock Intensity
(KI) signal pulse width if it is within a predetermined
range. If the KI signal pulse width is out of the
predetermined range, the fail counter will be
incremented. If the failure counter exceeds the
calibration, then test is complete and a failure will be
reported. If the sample counter threshold is reached
before the failure threshold, then the test is complete
and a pass will be reported. This test will detect an
open/short in the KI line circuit, ION module faults and
analog input faults in the PCM.

Conditions for setting the DTC

Ignition voltage is between 10volt and 16 volts.

No Crank DTCs set.

No EST DTCs set.

No Misfire DTCs set.

Action Taken When the DTC Sets

The PCM will ON the MIL after second trip with
detected the fault.

The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.

The PCM will store condition which were present when
the DTC was set as Freeze Frame and in the Failure
Records data.

Conditions for Clearing the MIL/DTC

The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

A history DTC P0325 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P0325 can be cleared using the Tech2 “Clear
Info” function or by disconnecting the PCM battery
feed.

Diagnostic Aids

An intermittent may be caused by the following:

Poor connections.

Misrouted harness.

Rubbed through wire insulation.

Broken wire inside the insulation.

Check for the following conditions:

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

Damaged harness-Inspect the wiring harness for
damage.

6E–251

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

If the harness appears to be OK, observe the Knock
Present, Knock Sensor Noise Channel display on
the Tech 2 while moving connectors and wiring
harnesses related to the sensor.

A change in the display will indicate the location of
the fault.

If DTC P0325 cannot be duplicated, the information
included in the Failure Records data can be useful in
determined vehicle mileage since the DTC was last
set.

If it is determined that the DTC occurs intermittently,
performing the DTC P0325 Diagnostic Chart may
isolate the cause of the fault.

DTC P0325 - ION Sensing Module Knock Intensity Circuit Fault

Step

Action

Value(s)

Yes

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

—

Go to

Step 2

Go to

OBD

System

Check

1. Ignition “ON”, engine “OFF”.
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records

conditions as noted.

4. Using a Tech 2, monitor “DTC” info for DTC P0325.

Does the Tech 2 indicate DTC P0325 failed this
ignition?

—

Go to

Step 3

Check the

Procedure

Refer to

Diagnostic

Aids

1. Ignition “OFF”.
2. Disconnect the ION sensing module.
3. Disconnect the PCM.

Is the action complete?

—

Go to

Step 4

—

Check the ION sensing harness between the PCM
(F68) and ION sensing module circuit (RED Wire) at
the KI line harness connector.

Was a problem found?

—

Verify repair

Go to

Step 5

1. Disconnect the ignition coil.

Is the action complete?

—

Go to

Step 6

—

Check the ION sensing harness for open or short circuit
between the ignition coil and ION sensing module
circuit at the harness connector.

Was a problem found?

—

Verify repair

Go to

Step 7

Check the following items;

1. Ignition coil and ignition coil circuit.
2. Ignition coil ground circuit for a poor connection.
3. If a problem is found, repair wiring harness as

necessary.

Was a problem found?

—

Verify repair

Go to

Step 8

Replace the Ignition coil.

Is the action complete?

—

Verify repair

Go to

Step 9

Check the following items;

1. ION sensing module ground circuit for a poor

connection.

2. If a problem is found, repair wiring harness as

necessary.

Was a problem found?

—

Go to

Step 10

Go to

Step 11

Repair wiring harness.

Is the action complete?

—

Verify repair

Go to

Step 11

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