Malfunction Indicator Lamp On Steady - Daewoo CIELO EURO III Manual

MALFUNCTION INDICATOR LAMP ON STEADY

Circuit Description
When the ignition is turned ON, the Malfunction Indica-
tor Lamp (MIL) will be turned on and remain on until the
engine is running, if no Diagnostic Trouble Codes
(DTCs) are stored. Battery voltage is supplied through
the ignition switch directly to the MIL telltale. The
engine control module
by providing a ground path through the MIL control
circuit to turn ON the MIL.
Test Description
Number(s) below refer to the step number(s) on the
diagnostic table.
1. The On-Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the system check complete?
Turn the ignition switch ON, with the engine OFF.
2
Is the Malfunction Indicator Lamp (MIL) ON?
1. Install the scan tool.
3 2. Command the MIL on and off.
Does the MIL turn on and off when commanded?
1. Turn the ignition switch OFF.
2. Disconnect the engine control module
(ECM) connectors.
4
3. Turn the ignition switch ON.
Is the MIL off?
Check the MIL control circuit for a short to ground
and repair as necessary.
5
Is the repair necessary?
Replace the instrument panel cluster. Refer to Sec-
tion 9E, Instrumentation and Driver Information.
6
Is the repair complete?
1. Turn the ignition switch OFF.
7 2. Replace the ECM.
Is the repair complete?
1. Using the scan tool, clear the Diagnostic Trouble
Codes (DTCs).
8
2. Attempt to start the engine.
Does the engine start and continue to run?
1. Allow the engine to idle until normal operating
temperature is reached.
9 2. Check if any DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?
DAEWOO T-154 BL2,3
(ECM) controls the MIL
Malfunction Indicator Lamp On Steady
Action
ENGINE CONTROLS 1F – 51
cords data on then scan tool, if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is stored
in the scan tool for later reference.
2. When the ignition is turned ON, the MIL should be
turned on and remain on until the engine is running
or until an emission related DTC is stored.
3. This step checks the ability of the ECM to con-
trol the MIL. The scan tool has the ability to com-
mand the MIL on and off.
5. A shorted MIL circuit can be diagnosed with a scan
tool.
7. The replacement ECM must be repro-
grammed. Refer to the latest Techline information for
reprogramming procedures.
Value
–
Go to Step 2
–
Go to Step 3
–
Go to Step 8
–
Go to Step 7
–
Go to Step 8
–
Go to Step 8
–
Go to Step 8
–
Go to Step 9
–
Go to the appli-
cable DTC table
Yes No
Go to "On-
Board Diag-
nostic System
Check"
Go to "No Mal-
function Indica-
tor Lamp"
Go to Step 4
Go to Step 5
Go to Step 6
–
–
Go to Step 1
System OK