Daewoo CIELO EURO III Manual page 473

DTC P0402 Exhaust Gas Recirculation (EGR) Excessive Flow (Cont'd)
Step
Check the signal circuit for a short to voltage and
repair as necessary.
8
Is a repair necessary?
With a Digital Voltmeter (DVM) connected to ground,
probe the 5 v reference circuit at terminal D.
9
Is the voltage measured near the specified value?
Check the control circuit for a short to voltage and
repair as necessary.
10
Is a repair necessary.
Connect the test light to B+ and again probe the
control circuit at terminal 1.
11
Does the test light illuminate?
1. Turn the ignition switch OFF.
2. Replace the
12
engine control module (ECM).
Is the action complete?
Check the EGR ground circuit for a poor connection
or proper terminal tension at the ECM and re-
13
pair as necessary.
Is a repair necessary?
Check the 5 v reference circuit for a short to voltage
and repair as necessary.
14
Is a repair necessary?
Check the control circuit at terminal 1 for a short to
ground and repair as necessary.
15
Is a repair necessary?
Check the control circuit at terminal 1 for an open or
poor connection at the EGR valve electrical connec-
16
tor and repair as necessary.
Is a repair necessary?
1. Turn the ignition switch OFF.
17 2. Replace the EGR valve.
Is the action complete?
Check the ECM electrical connector for a poor
connection and repair as necessary.
18
Is a repair necessary?
1. Using the scan tool, clear the Diagnostic Trouble
Codes (DTCs).
2. Start the engine and idle at normal operating
temperature.
19
3. Operate the vehicle within the conditions for
setting this DTC as specified in the supporting
text.
Does the scan tool indicate that this diagnostic ran
and passed?
Check if any additional DTCs are set.
20
Are any DTCs displayed that have not been diag-
nosed?
DAEWOO T-154 BL2,3
Action
ENGINE CONTROLS 1F – 303
Value Yes
–
Go to Step 19
5 v Go to Step 13
–
Go to Step 19
–
Go to Step 15
–
Go to Step 19
–
Go to Step 19
–
Go to Step 19
–
Go to Step 19
–
Go to Step 19
–
Go to Step 19
–
Go to Step 19
–
Go to Step 20
– Go to applicable
DTC table
No
Go to Step 12
Go to Step 14
Go to Step 12
Go to Step 16
–
Go to Step 17
Go to Step 12
Go to Step 12
Go to Step 18
–
Go to Step 12
Go to Step 2
System OK