Daewoo Matiz (2003 year). Manual - part 71

 

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Daewoo Matiz (2003 year). Manual - part 71

 

 

1F – 194  ENGINE CONTROLS

DTC P0404 – Electric Exhaust Gas Recirculation Opened (Cont’d)

Step

Action

Value(s)

Yes

No

14

Check the 5V reference circuit for a shortage to
battery voltage and repair as necessary.
Is a repair necessary?

–

Go to Step 19

Go to Step 12

15

Check the control circuit for a shortage to ground
and repair as necessary.
Is a repair necessary?

–

Go to Step 19

Go to Step 12

16

Check the control circuit for an open or poor
connection at the EEGR valve electrical connector
and repair as necessary.
Is a repair necessary?

–

Go to Step 19

Go to Step 18

17

Replace the EEGR valve.
Is the replacement complete?

–

Go to Step 19

–

18

Check the ECM electrical connector for a poor
connection and repair as necessary.
Is a repair necessary?

–

Go to Step 19

Go to Step 12

19

1. Using the scan tool, clear the Diagnostic Trouble

Codes (DTCs).

2. Start the engine and idle at normal operating

temperature.

3. Operate the vehicle within the conditions for

setting the DTC as specifiec in the supporting
text.

Does the scan tool indicate that this diagnostic ran
and passed?

–

Go to Step 20

Go to Step 2

20

Check if any additional DTCs are set.
Are any DTCs displayed that have not been
diagnosed?

–

Go to

Applicable DTC

table

System OK

ENGINE CONTROLS  1F – 195

BLANK

1F – 196  ENGINE CONTROLS

MAA1F230

DIAGNOSTIC TROUBLE CODE (DTC) – P1404 ELECTRIC EXHAUST GAS

RECIRCULATION CLOSED

Circuit Description

An Electric Exhaust Gas Re-circulation (EEGR) system
is used to lower oxides of nitrogen (NOX) emission lev-
els caused by high combustion temperatures. It a ac-
complishes this by feeding small amounts of exhaust
gases back into the combustion chamber. When the air/
fuel mixture is diluted with the exhaust gases, combus-
tion temperatures are reduced.

A linear EEGR valve is used on this system. The linear
EEGR valve is designed to accurately supply exhaust
gases to the engine without the use of intake manifold
vacuum. The valve controls exhaust flow going into the
intake manifold from the exhaust manifold fhrough an
orifice with a engine control module(ECM) controlled
pintle. The ECM controls the pintle position using inputs
from the Throttle Position (TP) and the Manifold Abso-
lute Pressure (MAP) sensor. The ECM then commands
the EEGR valve to operate when necessary by control-
ling an ignition signal through the ECM. This can be
monitored on a scan tool as the Desired EEGR position.

The ECM monitors the results of its command through a
feedback signal. By sending a 5 volt reference and a
ground to the EEGR valve, a voltage signal representing
the EEGR valve pintle position is sent to the ECM. This
feedback signal can also be monitored on a scan tool
and is the actual position of the EEGR pintle. The actual
EEGR position should always be near the commanded
or Desired EEGR position.

ThisDiagnostic Trouble Code(DTC) will detect an open
or short circuit.

Conditions for Setting THE DTC

D

EEGR circuit high voltage.

Action Taken When The DTCs Sets

D

The Malfunction Indicator Lamp (MIL) will illuminate.

D

The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Failure Records buffers.

D

A history DTC is stored.

D

EEGR is disabled.

Conditions for Clearing the MIL/DTC

D

The MIL will turn off after four consecutive ignition
cycles in which the diagnostic runs without a fault.

D

A history DTC will clear after 40 consecutive warm-up
cycles without a fault.

D

DTC(s) can be cleared by using the scan tool.

D

Disconnecting the ECM battery feed for more than 10
seconds.

Diagnostic Aids

Due to moisture associated with exhaust systems, the
EEGR valve may freeze and stick in cold weather at
times. After the vehicle is brought into a warm shop for
repairs, the valve warms and the problem disappears.
By watching the Actual EEGR and desired EEGR posi-
tions on a cold vehicle with a scan tool, the fault can be
easily verified. Check the Freeze Frame data to deter-
mine if the DTC set when the vehicle was cold by view-
ing the Engine Coolant Temperature (ECT).

ENGINE CONTROLS  1F – 197

DTC P1404 – Electric Exhaust Gas Recirculation Opend

Step

Action

Value(s)

Yes

No

1

Perform an Euro On-Board Diagnostic (EOBD)
System Check.
Is the system check complete?

–

Go to Step 2

Go to

“On-Board
Diagnostic

System Check”

2

1. Turn the ignition switch to with the engine OFF.
2. Install the scan tool.
3. Command the electric exhaust gas recirculation

(EEGR) valve to the specified values.

Does the Actual EEGR Position follow the desired
EEGR position?

25%, 50%,

75%, 100%

Go to Step 19

Go to Step 3

3

1. Turn the ignition switch to ON with the engine

OFF.

2. Disconnect the EEGR valve electrical connector.
3. With a digital voltmeter (DVM) connected to

ground, probe the 5volt reference circuit at
terminal 2 to the EEGR valve.

Does the DVM read near the specified value?

5V

Go to Step 4

Go to Step 5

4

Jumper the 5 volt reference circuit to the signal
circuit at terminals 2 and 3.
Does the actual EEGR position display the specified
value ?

100%

Go to Step 6

Go to Step 7

5

1. Connect the test light to B+.
2. Probe the 5 volt reference circuit to the EEGR

valve.

Does the test light illuminate?

–

Go to Step 6

Go to Step 7

6

Check the 5 volt reference and signal circuit for a
poor connection or proper terminal tension and
repair as necessary.
Is a repair necessary?

–

Go to Step 12

Go to Step 7

7

1. Connect the test light to B+.
2. Probe the signal circuit at terminal 1 to the EEGR

valve.

Does the test light illuminate?

–

Go to Step 8

Go to Step 9

8

Check for a high voltage in the EEGR valve 5 volt
reference circuit and repair as necessary.
Is a repair necessary?

–

Go to Step 12

Go to Step 9

9

Replace the EEGR valve.
Is a replacement complete?

–

Go to Step 12

–

10

Check for a high voltage in the EEGR valve signal
circuit and repair as necessary
Is a repair necessary?

–

Go to Step 12

Go to Step 11

11

Replace the engine control module(ECM).
Is a replacement complete?

–

Go to Step 12

–

12

1. Using the scan tool, clear the Diagnostic Trouble

Codes (DTCs).

2. Start the engine and idle at normal operating

temperature.

3. Operate the vehicle within the conditions for

setting the DTC as specifiec in the supporting
text.

Does the scan tool indicate that this diagnostic ran
and passed?

–

Go to Step 13

Go to Step 2

 

 

 

 

 

 

 

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