ignition OPEL FRONTERA 1998 Workshop Manual

6E–135 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0405 – EGR Pressure Sensor Low Voltage
StepNo Ye s Va l u e ( s ) Action
31. Turn off the ignition switch.
2. Remove the sensor connector connection.
3. Jumper between harness pins “red” and “blue”
wires.
4. Turn on the ignition switch “ON”.
Is the EGR pressure sensor voltage reading above the
specified value?
4 VGo to Step 5Go to Step 4
41. Turn off the ignition switch.
2. Remove the jumper wire.
3. Connect the relay & solenoid checker
(5-8840-0386-0) to the battery voltage, then check
the EGR pressure sensor signal circuit (blue wire).
4. Turn on the ignition switch.
Is the value displayed on the Tech 2 above the specified
value?
4 VGo to Step 6Go to Step 7
5Check the terminal connection at the EGR pressure
sensor and repair or replace terminal if necessary.
Is the action complete?
—Verify repair—
6Repair the 5V power circuit (red) harness or Replace
the ECM (Refer to the Data Programming in Case of
ECM change).
Is the action complete?
—Verify repair—
7Repair the signal circuit (blue) harness or Replace the
ECM (Refer to the Data Programming in Case of ECM
change).
Is the action complete?
—Verify repair—

6E–137 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1405 – EGR EVRV Circuit Open/Short
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. Review and record Failure Records information.
2. Clear DTC P1405.
3. Start the engine and idle for 1 minute.
4. Observe DTCs.
Is DTC P1405 set?
—Go to Step 3
Refer to
Diagnostic
Aid
31. Ignition “OFF.”
2. Disconnect the EVRV.
3. Check for an open or a short to ground in the EVRV
circuit between the EVRV connector and the ECM
harness connector.
4. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 4
4Check the connections at the EVRV and replace the
terminals if necessary.
Did any terminals require replacement?
—Verify repairGo to Step 5
5Check the connections at the ECM and replace the
terminals if necessary.
Did any terminals require replacement?
—Verify repair Go to Step 6
6Replace the EVRV.
Is the action complete?
—Verify repairGo to Step 7
7Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—Verify repair—

6E–138
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0406 (Flash DTC 26)
EGR Pressure Sensor High Voltage
060RW134
Action Taken When the DTC Sets
The ECM will illuminate the malfunction indicator lamp
(MIL) as soon as failure detected.
The ECM will store conditions which were present
w h e n t h e D T C w a s s e t a s F r e e z e F r a m e a n d i n F a i l u r e
Records data.
Conditions for Clearing the MIL/DTC
DTC P0404 can be cleared by using the scan tool
“Clear Info” function or by disconnecting the ECM
battery feed.
Diagnostic Aids
Check for the following conditions:
Poor connection or damaged harness – Inspect the
wiring harness for damage.
DTC P0406 – EGR Pressure Sensor High Voltage
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
2Put the engine into an idling status.
Is the EGR pressure sensor voltage value displayed on
the Tech 2 above the specified value?
4 VGo to Step 3Go to Step 4
31. Turn off the ignition switch.
2. Remove the sensor connector connection.
3. Turn on the ignition switch “ON”.
Is the EGR pressure sensor voltage value displayed on
the Tech 2 below the specified value?
1 VGo to Step 5Go to Step 6

6E–141 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P0475 – EXH #1 VSV Circuit Open/Short
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.” Review and record
Tech 2 Failure Records data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor the “ DTC” info for DTC
P0475.
Does the Tech 2 indicate DTC P0475 failed this
ignition?
—Go to Step 3
Refer to
Diagnostic
Aids
31. Ignition “OFF.”
2. Disconnect the EXH #1 VSV connectors.
3. Check the EXH #1 VSV circuit for a short to ground.
Is the EXH #1 VSV circuit shorted to ground?
—Verify repairGo to Step 4
4Replace the EXH #1 VSV.
Is the action complete?
—Verify repairGo to Step 5
51. Ignition “ON,” engine “OFF.” Review and record
Tech 2 Failure Records data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor the “ DTC” info for DTC
P0475.
Does the Tech 2 indicate DTC P0475 failed this
ignition?
—Go to Step 6—
6Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—Verify repair—

6E–143 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1475 – EXH #2 VSV Circuit Open/Short
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.” Review and record
Tech 2 Failure Records data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor the “ DTC” info for DTC
P1475.
Does the Tech 2 indicate DTC P1475 failed this
ignition?
—Go to Step 3
Refer to
Diagnostic
Aids
31. Ignition “OFF.”
2. Disconnect the EXH #2 connectors.
3. Check the EXH #2 circuit for a short to ground.
Is the EXH #2 circuit shorted to ground?
—Verify repairGo to Step 4
4Replace the EXH #2 VSV.
Is the action complete?
—Verify repairGo to Step 5
51. Ignition “ON,” engine “OFF.” Review and record
Tech 2 Failure Records data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor the “ DTC” info for DTC
P1475.
Does the Tech 2 indicate DTC P1475 failed this
ignition?
—Go to Step 6—
6Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—Verify repair—

6E–144
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1485 (Flash DTC 74)
ITP (Intake Thorottle Position) Sensor Low Voltage
060RW134
Circuit Description
The intake throttle position (ITP) sensor circuit provides a
voltage signal that changes relative to throttle blade
angle.
Action Taken When the DTC Sets
The ECM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
DTC P1485 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.
Diagnostic Aids
Check for the following conditions:
Poor connection at ECM – 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.
If the harness appears to be OK, observe the
throttle position display on the Tech 2 while
moving connectors and wiring harnesses related
to the ITP sensor. A change in the display will
indicate the location of the fault.
If DTC P1485 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.
DTC P1485 –ITP Sensor Low Voltage
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. With the throttle closed by the hand, observe the
“ITP Sensor” display on the Tech 2.
Is the “ITP Sensor” below the specified value?
0.22 VGo to Step 4Go to Step 3

6E–145 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1485 –ITP Sensor Low Voltage
StepNo Ye s Va l u e ( s ) Action
31. 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 the “DTC” info for DTC
P1485.
Does the Tech 2 indicate DTC P1485 failed?
—Go to Step 4
Refer to
Diagnostic
Aids
4Check the ITP sensor signal circuit for a poor
connection at the ECM and replace the terminal if
necessary.
Did the terminal require replacement?
—Verify repairGo to Step 5
51. 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 the “Specific DTC” info for
DTC P1485.
Dose the Tech 2 indicate DTC P1485 failed?
—Go to Step 6
Refer to
Diagnostic
Aids
6Replace the intake throttle.
Is the action complete?
—Verify repairGo to Step 7
7Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—Verify repair—

6E–146
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1486 (Flash DTC 74)
ITP (Intake Throttle Position) Sensor High Voltage
060RW134
Circuit Description
The intake throttle position (ITP) sensor circuit provides a
voltage signal that changes relative to throttle blade
angle.
Action Taken When the DTC Sets
The ECM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
DTC P1486 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.
Diagnostic Aids
Check for the following conditions:
Poor connection at ECM – 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. If the harness appears to be OK, observe the
ITP sensor display on the Tech 2 while moving
connectors and wiring harnesses related to the TP
sensor. A change in the display will indicate the
location of the fault.
Faulty TP sensor – With the ignition key “ON,” engine
“OFF,” observe the TP sensor display on the Tech 2
while slowly depressing the accelerator to wide open
throttle.
If DTC P1486 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.

6E–147 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1486 – ITP Sensor High Voltage
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. With the throttle closed by the hand, observe the
“ITP Sensor” display on the Tech 2.
Is the “ITP Sensor” above the specified value?
4.88 VGo 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 as noted.
4. Using a Tech 2, monitor “DTC” info for DTC P1486.
Does the Tech 2 indicate DTC P1486 failed.
—Go to Step 4
Refer to
Diagnostic
Aids
4Check for poor electrical connections at the ITP sensor
and replace terminals if necessary.
Did any terminals require replacement?
—Verify repairGo to Step 5
51. 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 the “DTC” info for DTC
P1486.
Dose the Tech 2 indicate DTC P1486 failed.
—Go to Step 6
Refer to
Diagnostic
Aids
6Replace the intake throttle.
Is the action complete?
—Verify repairGo to Step 7
7Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—Verify repair—

6E–149 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1487 – Intake Throttle System Circuit Open/Short
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 Records
conditions as noted.
4. Using a Tech 2, monitor the “DTC” info for DTC
P1487.
Does the Tech 2 indicate DTC P1487 failed?
—Go to Step 3
Refer to
Diagnostic
Aids
3Check the ITP circuit for a poor connection at the ECM
and ITP and replace the terminal if necessary.
Did the terminal require replacement?
—Verify repairGo to Step 4
41. Ignition “ON,” engine “OFF.”
2. Operate the throttle by the hand.
Is the action complete?
—Verify repairGo to Step 5
5Replace the ITP Assembly.
Is the action complete?
—Verify repairGo to Step 6
6Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—Verify repair—