Daewoo Nubira Owner's Manual page 180

1F – 358IENGINE CONTROLS
Step
4 Road test the vehicle with a voltmeter connected to
a suspected circuit or a scan tool connected to the
Data Link Connector (DLC).
Did the voltmeter or the scan tool indicate an abnor-
mal voltage or scan reading?
5 Replace the sensor in the affected circuit, if a Diag-
nostic Trouble Code (DTC) was stored for this circuit
(except for the DTCs P0171 and P0172.
Is the repair complete?
6 Does an intermittent Malfunction Indicator Lamp
(MIL) or DTC occur?
7
1. Check for a faulty relay, electronic control mod-
ule (ECM) driven solenoid, or switch.
2. Check for improper installation of electrical de-
vices, such as lights, two–way radios, electric
motors, etc.
3. Inspect the ignition control wires for proper
routing (away from ignition wires, ignition sys-
tem components, and the generator).
4. Check for a short–to–ground in the MIL circuit
or the DLC "test" terminal.
5. Inspect the PCM/ECM ground connections.
6. Correct or repair the affected circuits as need-
ed.
Is the repair complete?
8
1. Check for a loss of DTC memory.
2. Disconnect the Throttle Position Sensor.
3. Run the engine at idle until the MIL comes on.
4. Turn the ignition OFF.
Is DTC P0122 stored in memory?
9 Replace the PCM/ECM.
Is the repair complete?
10 Does the vehicle stall while driving?
11 Monitor the oxygen sensor (O2S) and the injector
base pulse width with the scan tool.
Does the scan tool display a steady low voltage
(about 0 mv) for the O2S sensor with the control
module commanding an injector base pulse width of
the value specified?
12
1. Check for an open diode across the A/C clutch
and for other open diodes.
2. Repair or replace any components as needed.
Is the repair complete?
Action Value(s) Yes
Go toStep 5
System OK
Go toStep 7
System OK
Go toStep 10
System OK
Go toStep 11
8 ms Go toStep 9
System OK
No
Go toStep 6
Go toStep 8
Go toStep 9
Go toStep 12
Go toStep 12
DAEWOO V–121 BL4