Opel Frontera UBS. Manual - part 502

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

D

The ECM will illuminate the malfunction indicator lamp
(MIL) as soon as failure detected. 

D

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

Conditions for Clearing the MIL/DTC

D

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:

D

Poor connection or damaged harness – Inspect the
wiring harness for damage.

DTC P0406 – EGR Pressure Sensor High Voltage

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

Put the engine into an idling status.

Is the EGR pressure sensor voltage value displayed on
the Tech 2 above the specified value?

4 V

Go to 

Step 3

Go to 

Step 4

3

1. 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 V

Go to 

Step 5

Go to 

Step 6

6E–139

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

DTC P0406 – EGR Pressure Sensor High Voltage

  (Cont'd)

Step

No

Yes

Value(s)

Action

4

Is the EGR pressure sensor voltage value displayed on
the Tech 2 below the specified value?

1 V

Refer to

Chart P0107

Refer to

Diagnostic

AidsandSymp

tom

Diagnosis

5

Connect the relay and solenoid checker
(5-8840-0386-0) to the battery voltage, then check the
sensor grounding circuit.

Does the checker lamp come on?

—

Go to 

Step 7

Go to 

Step 8

6

A voltage short circuit occurs in the MAP signal circuit
or this circuit is shorted with the 5V power circuit.
Repair the harness or Replace the ECM (Refer to the
Data Programming in Case of ECM change).

Is the action complete?

—

Verify repair

—

7

Replace the EGR pressure sensor hose or the EGR
pressure sensor.

Is the action complete?

—

Verify repair

—

8

Repair the harness for open ground circuit.

Is the action complete?

—

Verify repair

—

6E–140

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0475 (Flash DTC 71) 

EXH #1 VSV Circuit

060RW135

Circuit Description

EXH. #1, #2 VSV Circuit receives current through Engine
15A fuse, #1 and #2 being connected in parallel.

Action Taken When the DTC Sets

D

The ECM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.

D

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

D

DTC P0475 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:

D

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.

D

Damaged harness – Inspect the wiring harness for
damage.

6E–141

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

DTC P0475 – EXH #1 VSV Circuit Open/Short

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

1. 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

3

1. 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 repair

Go to 

Step 4

4

Replace the EXH #1 VSV.

Is the action complete?

—

Verify repair

Go to 

Step 5

5

1. 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

—

6

Replace the ECM (Refer to the Data Programming in
Case of ECM change).

Is the action complete?

—

Verify repair

—