air condition OPEL FRONTERA 1998 Workshop Manual

6E–168
ENGINE DRIVEABILITY AND EMISSIONS
DTC P0175 – Fuel Trim System Rich Bank 2
StepActionVa l u e ( s )Ye sNo
1Was the ”On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
2Are any DTCs set other than P0172 and P0175?
—
Go to the
applicable
DTC charts
and repair the
other DTCs
before
proceeding
with this
chart.
Go to Step 3
31. Start the engine and operate the vehicle in “closed
loop.”
2. Observe the “BANK 2 L.T. FUEL TRIM” display on
the Tech 2.
Is the displayed value more negative than the specified
value?
L.T. Fuel
Trim: –15%
(auto. trans.)
OR –12%
(man. trans.)
Go to Step 5Go to Step 4
41. Review and record the Tech 2 Failure Records data.
2. Clear the DTC P0172/P0175 and operate the
vehicle to duplicate the Failure Records conditions.
3. Monitor the Tech 2 “DTC” info for DTC P0175 while
operating the vehicle to duplicate the Failure
Records conditions.
4. Continue operating the vehicle until the DTC P0175
test runs.
5. Note the test result.
Does the Tech 2 indicate DTC P0175 failed this
ignition?
—Go to Step 5
The rich
condition is
not present.
If a
driveability
symptom still
exists, refer
to
Symptoms.
5Was DTC P0172 also set?—Go to Step 6Go to Step 15
6V i s u a l l y a n d p h y s i c a l l y i n s p e c t t h e a i r f i l t e r e l e m e n t a n d
replace it if necessary.
Did the air filter require replacement?
—Verify repairGo to Step 7
7Visually and physically inspect the air intake duct for
collapse or restriction and repair if necessary.
Did your inspection reveal a problem requiring repair?
—Verify repairGo to Step 8
8Inspect the MAF sensor inlet screen for damage or for
the presence of foreign objects which may partially
block air flow through the screen and correct any
problem found.
Did your inspection of the MAF sensor reveal a
condition requiring repair or replacement?
—Verify repairGo to Step 9
9Start the engine and note the idle quality.
Is a low or unsteady idle being experienced?
—Go to Step 10Go to Step 11
101. Turn the ignition off and physically inspect the
throttle body bore, throttle plate, and IAC passages
for coking and foreign objects.
2. If a problem was found, repair as necessary.
Did your inspection reveal a condition requiring repair?
—Verify repairGo to Step 11

6E–169 ENGINE DRIVEABILITY AND EMISSIONS
DTC P0175 – Fuel Trim System Rich Bank 2
StepNo Ye s Va l u e ( s ) Action
111. Disconnect the vacuum hose from the fuel pressure
regulator and inspect the hose for the presence of
fuel.
2. If fuel is present in the vacuum hose, replace the
fuel pressure regulator (refer to
Fuel Metering
System
).
Did the fuel pressure regulator require replacement?
—Verify repairGo to Step 12
121. Ignition “ON,” engine “OFF.”
2. Monitor the TP Angle display on the Tech 2 while
slowly depressing the accelerator pedal.
Does the TP Angle display increase steadily and
evenly from minimum value at closed throttle to
maximum value at wide-open throttle?
Minimum 0%
Maximum
100%
Go to Step 13Go to Step 18
131. 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.
Did both values change to near the specified value?
0%Go to Step 19Go to Step 14
141. Perform the “Fuel System Pressure Test.”
2. If Fuel System Pressure Test isolates a problem,
repair as necessary (refer to
Engine Fuel or Fuel
Metering System
).
Did the Fuel System Pressure Test isolate a condition
requiring repair?
—Verify repairGo to Step 16
15Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
UBS 98model year Immobilizer
Workshop Manual.
Is the action complete?—Verify repair—
161. Perform the “Injector Balance Test.”
2. If the Injector Balance Test isolates a problem,
repair as necessary (refer to
Fuel Metering
System
).
Did the Injector Balance Test isolate a problem
requiring repair?
—Verify repairGo to Step 17
171. Remove and visually/physically inspect the Bank 2
HO2S 1 for silicon contamination. This will be
indicated by a powdery white deposit on the portion
of the HO2S that is exposed to the exhaust stream.
2. If contamination is evident on the Bank 2 HO2S 1,
replace the contaminated sensor.
Did the sensor require replacement?
—Verify repair
Refer to
Diagnostic
Aids
181. Check the TP sensor mounting screws and tighten
or replace them as necessary if they are loose or
missing.
2. If the screws are OK, replace the TP sensor.
Is the action complete?
—Verify repair—
19Replace the MAF sensor.
Is the action complete?
—Verify repair—

6E–189 ENGINE DRIVEABILITY AND EMISSIONS
DTC P0325 – KS Module Circuit
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
2IMPORTANT:If an engine knock can be heard, repair
the engine mechanical problem before proceeding with
this diagnostic.
1. Operate the vehicle within parameters specified
under criteria included in “Conditions for Setting the
DTC.”
2. Using Tech 2, monitor “Specific DTC” info for DTC
P0325 until the DTC P0325 test runs.
3. Note the test result.
Does Tech 2 indicate DTC P0325 failed this ignition?
—Go to Step 4Go to Step 3
31. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data for
DTC P0325.
3. Operate the vehicle within Failure Records
conditions.
4. Using Tech 2, monitor “Specific DTC” info for DTC
P0325 until the DTC P0325 test runs.
Does Tech 2 indicate DTC P0325 test failed this
ignition?
—Go to Step 4
Refer to
Diagnostic
Aids
4Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
UBS 98model year Immobilizer
Workshop Manual.
Is the action complete?—Verify repair—

6E–191 ENGINE DRIVEABILITY AND EMISSIONS
DTC P0327 – KS Sensor Circuit
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
2IMPORTANT:If an engine knock can be heard, repair
the engine mechanical problem before proceeding with
this diagnostic.
1. Operate the engine within the conditions specified
in diagnostic support “Conditions for Setting the
DTC.”
2. Using Tech 2, monitor “Specific DTC” info for DTC
P0327 until the DTC P0327 test runs.
3. Note the test result.
Does Tech 2 indicate DTC P0327 failed this ignition?
—Go to Step 4Go to Step 3
31. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions.
4. Using Tech 2, monitor “Specific DTC” info for DTC
P0327 until the DTC P0327 test runs.
5. Note the test result.
Does Tech 2 indicate DTC P0327 failed this ignition?
—Go to Step 4
Refer to
Diagnostic
Aids
41. Check for a damaged terminal at the knock sensor
connector.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 5
5Using a test light to battery +, check the black/blue wire
(PCM side) to verify that the shield connection is good.
Did the test light illuminate?
—Go to Step 7Go to Step 6
6Repair the open shield ground.
Is the action complete?
—Verify repair—
71. Ignition “OFF,” disconnect the PCM.
2. Check the KS signal circuit for a poor terminal
connection at the PCM.
3. If a problem is found, replace the faulty terminal.
Was a problem found?
—Verify repairGo to Step 8
81. Ignition “OFF,” PCM disconnected.
2. Check the KS signal circuit between the PCM and
the knock sensor connector for an open, a short to
voltage, or a short to ground.
3. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 9
91. Ignition “OFF,” PCM disconnected.
2. Knock sensor connected.
3. Measure the resistance of the knock sensor by
connecting the DVM between the PCM connector
and the engine block.
Is the resistance of each knock sensor near the
specified value?
100K ohmsGo to Step 10Go to Step 11

6E–194
ENGINE DRIVEABILITY AND EMISSIONS
Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, disconnect
the PCM, turn the ignition on and observe a voltmeter
connected to the 58X reference circuit at the PCM
harness connector while moving connectors and
wiring harnesses related to the ICM. A change in
voltage will indicate the location of the fault.Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0336 – 58X Reference Signal Circuit
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
2Attempt to start the engine.
Does the engine start?
—Go to Step 3
Go to “Engine
Cranks But
Will Not Run”
chart
31. Review and record Failure Records information.
2. Clear DTC P0336.
3. Start the engine and idle for 1 minute.
4. Observe DTCs.
Is DTC P0336 set?
—Go to Step 4
Refer to
Diagnostic
Aids
41. Disconnect the PCM and CKP sensor.
2. Check for an open or a short to ground in the 58X
reference circuit between the CKP sensor
connector and the PCM harness connector.
3. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 5
51. Reconnect the PCM and CKP sensor.
2. Connect a DVM to measure voltage on the 58X
reference circuit at the PCM connector.
3. Observe the voltage while cranking the engine.
Is the voltage near the specified value?
2.5 VGo to Step 8Go to Step 6
6Check the connections at the CKP sensor and replace
the terminals if necessary.
Did any terminals require replacement?
—Verify repairGo to Step 7
7Replace the CKP sensor. Use caution to avoid any hot
oil that may drip out.
Is the action complete?
—Verify repair—
8Check connections at the PCM and replace the
terminals if necessary.
Did any terminals require replacement?
—Verify repairGo to Step 9
9Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
UBS 98model year Immobilizer
Workshop Manual.
Is the action complete?—Verify repair—

6E–196
ENGINE DRIVEABILITY AND EMISSIONS
Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, disconnect
the PCM, turn the ignition on and observe a voltmeter
connected to the 58X reference circuit at the PCM
harness connector while moving connectors and
wiring harnesses related to the ICM. A change in
voltage will indicate the location of the fault.Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0337 – CKP Sensor Circuit Low Frequency
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
2Attempt to start the engine.
Does the engine start?
—Go to Step 3Go to Chart 3
31. Review and record Failure Records information.
2. Clear DTC P0337.
3. Start the engine and idle for 1 minute.
4. Observe DTCs.
Is DTC P0337 set?
—Go to Step 4
Refer to
Diagnostic
Aid
41. Disconnect the CKP sensor.
2. Ignition “ON.”
3. Using a DVM, verify that 5 V reference and ground
are being supplied at the sensor connector (PCM
side).
Are 4-6 volts and ground available at the sensor?
—Go to Step 7Go to Step 5
51. Ignition “ON.”
2. With a DVM, backprobe the PCM connector 5 V
reference and ground connections.
Are 5 V reference and ground available at the PCM?
—Go to Step 6Go to Step 11
6Check 5 V reference or ground between the CKP
sensor and PCM and repair the open circuit, short to
ground or short to voltage.
Is the action complete?
—Verify repair—
71. Ignition “OFF.”
2. Disconnect the PCM and CKP sensor.
3. Check for an open or a short to ground in the 58X
reference circuit between the CKP sensor
connector and the PCM harness connector.
4. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 8
81. Reconnect the PCM and CKP sensor.
2. Connect a DVM to measure voltage on the 58X
reference circuit at the PCM connector.
3. Observe the voltage while cranking the engine.
Is the voltage near the specified value?
2.5 VGo to Step 11Go to Step 9
9Check the connections at the CKP sensor and replace
the terminals if necessary.
Did any terminals require replacement?
—Verify repairGo to Step 10
10Replace the CKP sensor. Use caution and avoid hot oil
that may drip out.
Is the action complete?
—Verify repair—

6E–200
ENGINE DRIVEABILITY AND EMISSIONS
DTC P0341 – CMP Sensor Circuit Performance
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
21. Ignition “ON.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using Tech 2, monitor “Specific DTC” info for DTC
P0341 until the DTC P0341 test runs.
5. Note the test result.
Does Tech 2 indicate DTC P0341 failed this ignition?
—Go to Step 3
Refer to
Diagnostic
Aids
31. Disconnect the CMP sensor.
2. Measure the voltage between the sensor feed
circuit and the sensor ground circuit at the CMP
sensor harness connector.
Does the voltage measure near the specified value?
4-6 VGo to Step 4Go to Step 5
4Measure the voltage between the CMP sensor signal
circuit and the sensor ground circuit at the CMP sensor
harness connector.
Does the voltage measure near the specified value?
4-6 VGo to Step 11Go to Step 8
5If the voltage measured in step 3 was less than 4-6
volts, proceed directly to step 6 without completing this
step.
If the voltage in step 3 was greater than 4-6 V, repair the
short to voltage in the CMP feed circuit.
Is the action complete?
—Verify repair—
61. Check for poor connections at the camshaft
position sensor.
2. If a problem is found, repair it as necessary.
Was a problem found?
—Verify repairGo to Step 7
71. Ignition “OFF,” disconnect the PCM and the CMP
sensor.
2. Check the following circuits for an open between the
ignition coil and the CMP sensor:
The sensor feed circuit.
3. If a problem is found, repair as necessary.
Was a problem found?
—Verify repair Go to Step 9
81. Ignition “OFF,” disconnect the PCM (leave the CMP
sensor disconnected).
2. Ignition “ON,” check the following circuits:
The CMP sensor signal circuit for an open or a
short to voltage.
The CMP sensor input signal circuit for a short
to ground.
3. If a problem is found, repair it as necessary.
Was a problem found?
—Verify repairGo to Step 9
9Check for a short or open in the sensor ground circuit.
Was a problem found?
—Verify repairGo to Step 10

6E–203 ENGINE DRIVEABILITY AND EMISSIONS
Conditions for Clearing the MIL/DTC
DTC P0342 can be cleared by using Tech 2 “Clear Info”
function or by disconnecting the PCM battery feed.
Diagnostic Aids
An intermittent may be caused by a poor connection,
rubbed-through wire insulation or a wire broken inside the
insulation. Check for:
Poor connection – Inspect the PCM harness and
connectors for improper mating, broken locks,
improperly formed or damaged terminals, and poor
terminal to wire connection.
Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, disconnect
the PCM, turn the ignition on and observe a voltmeterconnected to the CMP signal circuit at the PCM
harness connector while moving connectors and
wiring harnesses related to the ICM and the CMP
sensor. A change in voltage will indicate the location
of the fault.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. Ensures that the fault is present.
14.Determines whether the fault is being caused by a
missing camshaft magnet or a faulty PCM. The
voltage measured in this step should read around 4
volts, toggling to near 0 volts when the CMP sensor
interfaces with the camshaft magnet.
DTC P0342 – CMP Sensor Circuit Low
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
21. Ignition “ON.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using Tech 2, monitor “Specific DTC” information
for DTC P0342 until the DTC P0342 test runs.
5. Note test result.
Does Tech 2 indicate DTC P0342 failed this ignition?
—Go to Step 3
Refer to
Diagnostic
Aids
31. Ignition “ON.”
2. Disconnect the CMP sensor.
3. Measure the voltage between the sensor feed
circuit and the sensor ground circuit at the CMP
sensor harness connector.
Does the voltage measure near the specified value?
4-6 VGo to Step 7Go to Step 4
41. Ignition “OFF,” disconnect the PCM and the CMP
sensor.
2. Check for poor connections at the camshaft
position sensor.
3. If a problem is found, repair it as necessary.
Was a problem found?
—Verify repairGo to Step 5
51. Check for poor connections at the PCM.
2. If a problem is found, repair it as necessary.
Was a problem found?
—Verify repair Go to Step 6
61. Check the following circuits between the PCM and
the CMP sensor:
The sensor feed circuit. Open or short to
ground?
The sensor ground circuit. Open or short to
voltage?
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repair—

6E–207 ENGINE DRIVEABILITY AND EMISSIONS
Poor connection at PCM – Inspect the harness
connectors for backed-out terminals, improper mating,
broken locks, improperly formed or damaged
terminals, and poor terminal-to-wire connections.
Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe
Tech 2 display related to DTC P0351 while moving theconnector and wiring related to the ignition system. A
change in the display will indicate the location of the
fault.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0351 – Ignition 1 Control Circuit
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
21. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Record
conditions as noted.
4. Use Tech 2 to monitor the “Specific DTC”
information for DTC P0351 until the DTC P0351 test
runs.
5. Note the test result.
Does Tech 2 indicate DTC P0351 failed this ignition
cycle?
—Go to Step 3
Go to
Diagnostic
Aids
3Check for faulty connection at ignition coil.
Was a problem found?
—Verify repair Go to Step 4
4Check for faulty connection at PCM connector.
Was a problem found?
—Verify repair Go to Step 5
51. Ignition “ON,” engine “OFF.”
2. Back probe the ignition control circuit 1 at the PCM
with a DVM.
Is the voltage near the specified value?
25-55 mVGo to Step 6Go to Step 9
61. Ignition “ON,” engine running.
2. Back probe the ignition control circuit at the PCM for
the cylinder being tested.
Is the voltage in the specified range, rapidly toggling
back and forth to a reading 20-50 mV higher?
100-180 mVGo to Step 7Go to Step 13
71. Ignition “OFF.”
2. Disconnect the 3-pin and 5-pin connectors at the
ignition coil.
3. Check ignition control circuit 1 voltage at the ignition
coil connector while cranking the engine.
Does the voltage measure between the specified
values?
200-1200 mVGo to Step 8Go to Step 11
8Replace the ignition coil.
Is the action complete?
—Verify repair—
91. Ignition “OFF.”
2. Disconnect the PCM and the ignition coil.
3. Check ignition control circuit 1 for short to ground.
Was a problem found?
—Verify repair Go to Step 10
10Check ignition control circuit 1 for short to voltage.
Was a problem found?
—Verify repairGo to Step 13

6E–210
ENGINE DRIVEABILITY AND EMISSIONS
Poor connection at PCM – Inspect the harness
connectors for backed-out terminals, improper mating,
broken locks, improperly formed or damaged
terminals, and poor terminal-to-wire connections.
Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Tech 2 display related to DTC P0352 while moving theconnector and wiring related to the ignition system. A
change in the display will indicate the location of the
fault.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P0352 – Ignition 2 Control Circuit
StepActionVa l u e ( s )Ye sNo
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
21. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Record
conditions as noted.
4. Use a Tech 2 to monitor the “Specific DTC”
information for DTC P0352 until the DTC P0352 test
runs.
5. Note the test result.
Does the Tech 2 indicate DTC P0352 failed this ignition
cycle?
—Go to Step 3
Go to
Diagnostic
Aids
3Check for faulty connection at ignition coil.
Was a problem found?
—Verify repairGo to Step 4
4Check for faulty connection at PCM connector.
Was a problem found?
—Verify repairGo to Step 5
51. Ignition “ON,” engine “OFF.”
2. Back probe the ignition control circuit 2 at the PCM
with a DVM .
Is the voltage near the specified value?
25-55 mVGo to Step 6Go to Step 9
61. Ignition “ON,” engine running.
2. Back probe the ignition control circuit at the PCM for
the cylinder being tested.
Is the voltage in the specified range, rapidly toggling
back and forth to a reading 20-50 mV higher?
100-180 mVGo to Step 7Go to Step 13
71. Ignition “OFF.”
2. Disconnect the 3-pin and 5-pin connectors at the
ignition coil.
3. Check ignition control circuit 2 voltage at the ignition
coil connector while cranking the engine connector.
Does the voltage measure between the specified
values?
200-1200 mVGo to Step 8Go to Step 11
8Replace the ignition coil.
Is the action complete?
—Verify repair—
91. Ignition “OFF.”
2. Disconnect the PCM and the ignition coil.
3. Check ignition control circuit 2 for short to ground.
Was a problem found?
—Verify repairGo to Step 10
10Check ignition control circuit 2 for short to voltage.
Was a problem found?
—Verify repairGo to Step 13