1F – 48IENGINE CONTROLS
DAEWOO V–121 BL4
Malfunction Indicator Lamp On Steady
Step Action Value(s) Yes No
1 Perform an On–Board Diagnostic (OBD II) System
Check.
Is the system check complete?
Go to Step 2 Go to ”On–
Board Diagnos-
tic System
Check”
2 Turn the ignition switch ON, with the engine OFF.
Is the Malfunction Indicator Lamp (MIL) on?
Go to Step 3 Go to ”No Mal-
function Indica-
tor Lamp”
3
1. Install the scan tool.
2. Command the MIL on and off.
Does the MIL turn on and off when commanded?
Go to Step 8 Go to Step 4
4
1. Turn the ignition switch OFF.
2. Disconnect the powertrain control module
(PCM)/engine control module (ECM) connec-
tors.
3. Turn the ignition switch ON.
Is the MIL off?
Go to Step 7 Go to Step 5
5 Check the MIL control circuit for a short to ground
and repair if necessary.
Is the repair necessary?
Go to Step 8 Go to Step 6
6 Replace the instrument panel cluster. Refer to Sec-
tion 9E, Instrumentation/Driver Information.
Is the repair complete?
Go to Step 8
7 Replace the PCM/ECM.
Is the repair complete?
Go to Step 8
8
1. Using the scan tool, clear the Diagnostic
Trouble Codes (DTCs).
2. Attempt to start the engine.
Does the engine start and continue to run?
Go to Step 9 Go to Step 1
9
1. Allow the engine to idle until normal operating
temperature is reached.
2. Check if any DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?
Go to the appli-
cable DTC
table
System OK
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