M31f4 Engine Controls 280-324.pdf
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1F – 280 ENGINE CONTROLS
SYMPTOM DIAGNOSIS
IMPORTANT PRELIMINARY CHECKS
Important:
Several symptom procedures call for a care-
ful visual/physical inspection. Always perform the visual/
physical test first. Visual inspections may lead to
correcting a problem without further checks and can
save valuable time.
Step
Action
Value(s)
Yes
No
1
Perform the On-Board Diagnostic (EOBD) System
Check.
Are any Diagnostic Trouble Code(s) (DTCs) stored
in the Engine Control Module (ECM) memory?
–
Go to
Appropriate
DTC Table
Go to
Step 2
2
1. Inspect all of the ECM ground connections.
2. Inspect all of the vacuum hoses for splits, kinks,
and proper connections.
3. Check for air leaks at all of the mounting areas of
the intake manifold sealing surfaces.
4. Inspect the ignition wires for cracking, hardness,
proper routing, and carbon tracking.
5. Inspect the wiring for proper connections,
pinches, and cuts.
Are all checks complete?
–
–
Go to
Appropriate
Symptom Table
DAEWOO M-150 BL2
ENGINE CONTROLS 1F – 281
INTERMITTENT
Definition: The problem may or may not illuminate the
Malfunction Indicator Lamp (MIL) or store a Diagnostic
Trouble Code (DTC).
present in order to locate the problem. If a fault is inter-
mittent, use of Diagnostic Trouble Code tables may re-
sult in the replacement of good parts.
Important:
Do not use the Diagnostic Trouble Code
(DTC) tables for intermittent problems. A fault must be
Step
Action
Value(s)
Yes
No
Were the Important Preliminary Checks performed?
Go to
“Important
Preliminary
Checks”
1
–
Go to
Step 2
2
1. Perform a careful inspection of any suspect
circuits.
2. Inspect for poor mating of the connector halves,
or terminals not fully seated into the connector
body.
3. Inspect for improperly formed or damaged
terminals.
4. Inspect for poor terminal-to-wire connections.
This requires removing the terminal from the
connector body to inspect it.
Are any problems present?
–
Go to
Step 3
Go to
Step 4
3
Repair the electrical connections as needed.
Is the repair complete?
–
System OK
–
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
abnormal voltage or scan reading?
–
Go to
Step 5
Go to
Step 6
5
Replace the sensor in the affected circuit, if a
Diagnostic Trouble Code (DTC) was stored for this
circuit (except for the DTCs P0171 and P0172).
Is the repair complete?
–
–
System OK
6
Does an intermittent Malfunction Indicator Lamp
(MIL) or DTC occur?
–
Go to
Step 7
Go to
Step 8
7
1. Check for a faulty relay, Engine Control Module
(ECM) driven solenoid, or switch.
2. Check for improper installation of electrical
devices, such as lights, two-way radios, electric
motors, etc.
3. Inspect the ignition control wires for proper
routing (away from ignition wires, ignition system
components, and the generator).
4. Check for a short-to-ground in the MIL circuit or
the DLC “test” terminal.
5. Inspect the ECM ground connections.
6. Correct or repair the affected circuits as needed.
Is the repair complete?
–
–
System OK
8
1. Check for a loss of DTC memory.
2. Disconnect the throttle position (TP) sensor.
3. Run the engine at idle until the MIL comes on.
4. Turn the ignition OFF.
Is DTC P0122 stored in memory?
–
Go to
Step 10
Go to
Step 9
DAEWOO M-150 BL2
1F – 282 ENGINE CONTROLS
Intermittent (Cont’d)
Step
Action
Value(s)
Yes
No
9
1. Turn the ignition OFF.
2. Replace the ECM.
Is the repair complete?
–
–
System OK
10
Does the vehicle stall while driving?
–
Go to
Step 11
Go to
Step 12
11
Monitor the oxygen sensor and the injector base
pulse width with the scan tool.
Does the scan tool display a steady low voltage
(about 0 millivolts) for the oxygen sensor with the
control module commanding an injector base pulse
width of the value specified?
8 ms
Go to
Step 9
Go to
Step 12
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?
–
–
System OK
DAEWOO M-150 BL2
ENGINE CONTROLS 1F – 283
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
Were the Important Preliminary Checks performed?
Go to
“Important
Preliminary
Checks”
1
–
Go to
Step 2
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?
Go to “Fuel
Pump Relay
Circuit Check”
2 sec
Go to
Step 7
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
–
DAEWOO M-150 BL2
1F – 284 ENGINE CONTROLS
Hard Start (Cont’d)
Step
Action
Value(s)
Yes
No
10
1. Check the fuel injector driver circuit.
2. Disconnect all of the fuel injector harness
connectors at the fuel injectors.
3. Connect an injector test light between the
harness terminals of each fuel injector connector.
4. Note the test light while cranking the engine.
Does the test light blink at all connectors?
–
Go to
Step 13
Go to
Step 11
11
Check the fuel injector driver wiring harness, the
connectors, and the connector terminals for the
proper connections.
Is the problem found?
–
Go to
Step 12
Go to
Step 28
12
Repair the wiring harness, the connector, or the
connector terminal as needed.
Is the repair complete?
–
–
System OK
13
F)
Note:
The resistance will increase slightly at higher
temperatures)?
11.6–12.4
Go to
Step 15
Go to
Step 14
14
Replace any fuel injector with a resistance that is out
of specifications.
Is the repair complete?
–
–
System OK
15
Perform an injector diagnosis.
Is the problem found?
–
Go to
Step 16
Go to
Step 17
16
Replace any restricted or leaking fuel injectors as
needed.
Is the repair complete?
–
–
System OK
17
1. Check for the proper ignition voltage output for
each cylinder with a spark tester.
2. Inspect the spark plugs for cracks, wear, improper
gap, burned electrodes, or heavy deposits.
3. Inspect the ignition wires for short conditions.
4. Inspect all of the ignition grounds for loose
connections.
5. Inspect the Engine Control Module (ECM) for the
proper operation.
Is the problem found?
–
Go to
Step 18
Go to
Step 19
18
Correct or replace any faulty ignition components.
Is the repair complete?
–
System OK
–
19
Does the engine misfire or cut out under load or at
idle?
–
Go to “Ignition
System Check” Go to
Step 20
20
Does the engine start, but then immediately stall?
–
Go to
Step 21
Go to
Step 23
21
1. Remove the Crankshaft Position (CKP) sensor.
2. Inspect for faulty connections and repair as
needed.
Is the problem found?
–
Go to
Step 22
Go to
Step 25
22
Repair the faulty connections as needed.
Is the repair complete?
–
System OK
–
DAEWOO M-150 BL2
Measure the resistance of each fuel injector.
Is the fuel injector resistance within the value
specified at 20
C (68
Plik z chomika:
sumo1962
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