ENGINE CONTROLS 1F–283
DAEWOO M-150 BL2
HARD START
Definition: 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
bulletins for updates.
Step Action Value(s) Yes No
1
Were the Important Preliminary Checks performed?
–
Go to Step 2
Go to
“Important
Preliminary
Checks”
2
1. Connect the scan tool to the Data Link Connector
(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
ambient temperature by more than the value
specified? 3_C (5_F) Go to Step 3 Go to Step 4
3
1. Measure the resistance of the ECT sensor and
the IAT sensor.
2. Compare the resistance value to specifications
using the Temperature Vs. Resistance tables for
DTCs P0118 and P0113.
3. If the resistance is not the same, replace the
faulty sensor.
Is the repair complete?
–
System OK
–
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
specified? 0.4–0.8 V Go to Step 5 Go to Step 26
5
1. Check the Manifold Absolute Pressure (MAP)
sensor response and accuracy.
2. Replace the MAP sensor as needed.
Is the repair complete?
–
System OK Go to Step 6
6
Check the fuel pump operation.
Does the fuel pump operate for the specified time
when the ignition switch is turned ON? 2 sec Go to Step 7
Go to “Fuel
Pump Relay
Circuit Check”
7
Check the fuel system pressure.
Is the fuel pressure within the specifications?
380 kPa
(55 psi) Go to Step 8 Go to Step 27
8
Check for water contamination in the fuel.
Is fuel contaminated?
–
Go to Step 9 Go to Step 10
9
Replace the contaminated fuel.
Is the repair complete?
–
System OK
–
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