Dtc P0402 Exhaust Gas Recirculation (Egr) Excessive Flow - Daewoo CIELO EURO III Manual

1F – 302 ENGINE CONTROLS
9. If the EGR valve 5 volt reference is shorted to volt-
age, the Digital Voltmeter (DVM) will read battery
voltage, and additional DTCs may be set and the
engine performance will be poor.
12. The replacement ECM must be repro-
grammed. Refer to the latest Techline procedure for
ECM reprogramming.
13. Although the circuitry acted correctly when checked,
a problem may still lie within the terminals which
would not show up in probe-type testing. Be sure to
check the terminals for being backed out, improperly
formed or damaged, and for poor tension.
17. All circuits to the EGR valve are OK at this point.
The fault lies internally in the EGR valve and, there-
fore, must be replaced. Be sure all gasket material is
removed from the EGR mounting surface. Even a

DTC P0402 Exhaust Gas Recirculation (EGR) Excessive Flow

Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the system check complete?
1. Turn the ignition switch ON with the engine OFF.
2. Install a scan tool.
3. Command the Exhaust Gas Recirculation (EGR)
2
valve to the specified values.
Does the Actual EGR Position follow the Desired
EGR Position?
1. Disconnect the EGR valve electrical connector.
2. With a test light connected to B+, probe the
3
ground circuit at terminal B to the EGR valve.
Does the test light illuminate?
1. Connect the EGR valve electrical connector.
2. With a Digital Voltmeter (DVM) connected to
ground, probe the EGR control circuit at terminal
A to the EGR valve.
4
3. Command the EGR valve to the specified values
using a scan tool.
After the command is raised, is the voltage chan-
ged?
Repair the open or poor connection in the EGR
ground circuit.
5
Is the action complete?
With a test light connected to ground, probe the sig-
nal circuit at terminal C.
6
Does the test light illuminate?
With the test light connected to ground, again
probe the control circuit at terminal A without
commanding the
7
EGR valve with the scan tool.
Does the test light illuminate?
Action
small amount of material may cause a DTC
P0401 to set.
18. Check the terminals for being backed out, improper-
ly formed or damaged, and for poor tension.
19. Clearing DTCs is a very important step for this diag-
nostic. The clearing function allows the EGR valve
to relearn a new pintle position as the old pintle posi-
tion was inaccurate due to the failure that caused
the DTC. The DTC must be cleared with the ignition
ON, engine OFF or when the engine is idling. If the
ECM sees a EGR command, the new pintle
will not be learned.
20. If no malfunctions have been found at this point and
no additional DTCs were set, refer to "Diagnostic
Aids" in this section for additional checks and infor-
mation.
Value
–
Go to Step 2
25%, 50%,
Go to Step 19
75%, 100%
–
Go to Step 4
–
Go to Step 6
–
Go to Step 19
–
Go to Step 8
–
Go to Step 10
Yes No
Go to
"On-Board
Diagnostic
System Check"
Go to Step 3
Go to Step 5
Go to Step 7
–
Go to Step 9
Go to Step 11
DAEWOO T-154 BL2,3