Opel Frontera UBS. Manual - part 331

 

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Opel Frontera UBS. Manual - part 331

 

 

6E–230

ENGINE DRIVEABILITY AND EMISSIONS

DTC P0405 – EGR Low Volt

  (Cont'd)

Step

No

Yes

Value(s)

Action

12

1. Ignition “ON”.
2. Backprobe with a DVM to measure voltage at PCM

sensor ground pin and pintle position pin.

Was voltage in range?

Less than

0.1 V

Go to 

Step 13

Go to 

Step 18

13

1. Ignition “OFF”.
2. Disconnect the EGR harness.
3. Check short circuit between EGR pintle position

circuit and EGR ground circuit.

Was any short circuit?

Go to 

Step 14

Go to 

Step 18

14

Locate and repair the short to ground in the pintle
position circuit

Is the action complete?

Verify repair

15

1. Ignition “OFF”.
2. Disconnect the PCM.
3. Ignition “ON”.
4. Measure the voltage between the EGR pintle

position circuit and ground.

Is the measured voltage near the specified value?

Less than

0.1 V

Go to 

Step 17

Go to 

Step 16

16

Check for a short circuit between other wires and the
pintle position circuit

Was any short circuit?

Repair short

circuit

Verify repair

Go to 

Step 17

17

Replace the EGR valve.

Does DTC P1404 still fail “specific DTC test on Tech 2?

Go to 

Step 18

Verify repair

18

Examine the PCM pin and terminal connection.

Was there a damaged terminal?

Go to 

Step 4

Go to 

Step 19

19

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed.  Refer to 

UBS 98model year Immobilizer

Workshop Manual.

Is the action complete?

Verify repair

6E–231

ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0406  EGR High Voltage

D06RW106

Circuit Description

The powertrain control module (PCM) monitors the EGR
valve pintle position input to ensure that the valve
responds properly to command from the PCM. If current
pintle  position voltage indicates more than 4.8 V and last
more than 10 seconds, then the PCM will set DTC P0406.

Conditions for Setting the DTC

D

Ignition voltage is between 11 and 16 volts.

D

EGR pintle position output voltage is more than 4.8 volt
and last more than 10 sec.

Action Taken When the DTC Sets

D

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

D

The PCM 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 Tech 2 “Clear Info”
function or by disconnecting the PCM battery feed.

Diagnostic Aids

Check for the following conditions:

D

Poor connection or damaged harness – Inspect the
wiring harness for damage. If the harness appears to
be OK, observe the EGR actual position display on
Tech 2 while moving connectors and wiring harnesses
related to EGR valve. A change in the display will
indicate the location of the fault.

6E–232

ENGINE DRIVEABILITY AND EMISSIONS

DTC P0406 – EGR 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

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 Tech 2, monitor “DTC” info for DTC P0406

until the DTC P0406 test runs. Note the result.

Does Tech 2 indicates DTC P0406 failed this ignition?

Go to 

Step 3

Refer to

Diagnostic

Aids

3

1. Disconnect the EGR valve harness connector.
2. Inspect the EGR valve and connectors for damaged

pin or terminals.

Were there any damaged pins or terminals?

Go to 

Step 4

Go to 

Step 5

4

Repair the damaged pin or terminal.

Is the action complete?

Verify repair

Is the action

complete?

5

1. Disconnect the EGR harness connector.
2. Ignition “ON”.
3. At the EGR valve, use a DVM to check the voltage

at the 5 volt reference wire (RED).

Did the DVM indicate the specified value?

4–6 V

Go to 

Step 8

Go to 

Step 6

6

1. Ignition “ON”.
2. At the PCM connector, backprobe with a DVM at the

5 volt reference for the EGR valve.

Did the DVM indicate the specified value?

4–6 V

Go to 

Step 7

Go to 

Step 16

7

Repair the open 5 volt reference circuit

Is the action complete?

Verify repair

8

1. Ignition “OFF”
2. Disconnect the EGR  harness.
3. Use a DVM to check for an resistance between D (5

V reference) and B (Sensor Ground) at EGR sensor
terminals.

NOTE: J-35616 Connector Test Adapter Kit may be
useful for gaining access to the recessed pins on the
valve.

Was there measured resistance in range?

5 to 5 K

W

Go to 

Step 9

Go to 

Step 15

9

1. Ignition “OFF”.
2. Disconnect the EGR harness.
3. Use a DVM to check for an resistance between B

and C at EGR sensor terminal.

Was there open circuit?

Go to 

Step 15

Go to 

Step 10

10

1. Ignition “OFF”.
2. Disconnect the EGR harness at PCM connector.
3. Use a DVM to check for shorted wire between A1

and B7.

Was there shorted wire?

Go to 

Step 14

Go to 

Step 11

6E–233

ENGINE DRIVEABILITY AND EMISSIONS

DTC P0406 – EGR High Voltage

  (Cont'd)

Step

No

Yes

Value(s)

Action

11

1. Ignition “ON”.
2. Use a DVM to backprobe at  terminal C of EGR

valve for voltage.

Was measured voltage more than 4.8 V?

more than

4.8 V

Go to 

Step 12

Go to 

Step 12

12

1. Ignition “ON”.
2. Stay the EGR harness connected.
3. Check voltage by backproving at PCM B7 terminal.

Was voltage more than 4.8 V?

4.8 V

Go to 

Step 16

Go to 

Step 13

13

1. Locate short circuit at EGR harness between RED

to RED or GREEN, RED to YEL.

2. Replace EGR harness.

Is the action complete?

Verify repair

14

Replace EGR harness.

Is the action complete?

Verify repair

15

Replace the EGR valve.

Does DTC P1404 still fail “specific DTC test on Tech 2?

Go to 

Step 16

Verify repair

16

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed.  Refer to 

UBS 98model year Immobilizer

Workshop Manual.

Is the action complete?

Verify repair

 

 

 

 

 

 

 

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