Hard Start - Daewoo Nubira Owner's Manual

The engine cranks OK, but does not start for a long
time. The engine eventually runs or may start and
immediately die.
Important : Ensure that the driver is using the correct
starting procedure. Before diagnosing, check service bul-
letins for updates.
Step
1 Were the Important Preliminary Checks performed?
2
1. Connect the scan tool to the Data Link Con-
nector (DLC).
2. Check the Engine Coolant Temperature (ECT)
sensor and the Intake Air Temperature (IAT)
sensor using the scan tool.
3. Compare the coolant temperature and the IAT
with the ambient temperature when the engine
is cold.
Do the ECT and the IAT readings differ from the am-
bient temperature by more than the value specified?
3
1. Measure the resistance of the ECT and the IAT
sensor.
2. Compare the resistance value to specifications
using the Temperature Vs. Resistance tables
for diagnostic trouble codes (DTCs) P0118 and
P0113.
3. If the resistance is not the same, replace the
faulty sensor.
Is the repair complete?
4
1. Check for a sticking throttle shaft or a binding
linkage that may cause a high Throttle Position
(TP) sensor voltage. Repair or replace as
needed.
2. Check the TP sensor voltage reading with the
throttle closed.
Does the voltage measure within the value speci-
fied?
5
1. Check the Manifold Absolute Pressure (MAP)
sensor response and accuracy.
2. Replace the MAP sensor as needed.
Is the repair complete?
6 Check the fuel pump operation.
Does the fuel pump operate for the specified time
when the ignition switch is turned ON?
7 Check the fuel system pressure.
Is the fuel pressure within the specifications?
8 Check for water contamination in the fuel.
Is fuel contaminated?
9 Replace the contaminated fuel.
Is the repair complete?
DAEWOO V–121 BL4

HARD START

Action
ENGINE CONTROLS 1F – 359
Value(s) Yes
Go toStep 2
5³F (3³C) Go toStep 3
System OK
0.4–0.8 v Go toStep 5
System OK
2 sec Go toStep 7
(284–325 kPa) Go toStep 29
41–47 psi
Go toStep 9
System OK
No
Go to"Impor-
tant Preliminary
Checks"
Go toStep 4
Go toStep 26
Go toStep 6
Go to"Fuel
Pump Relay
Circuit Check"
Go toStep 8
Go toStep 10