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1F – 378 ENGINE CONTROLS
Step
Repair or replace any components as needed.
25
Is the repair complete?
1. Check the Exhaust Gas Recirculation (EGR)
valve for proper operation.
2. Inspect the battery cables and the ground straps
for proper connections.
26
3. Check the generator voltage output. Repair or
replace the generator if the voltage output is not
within the value specified.
Is the problem found?
Repair or replace any components as needed.
27
Is the repair complete?
1. Inspect for broken engine mounts.
2. Check for proper valve timing.
3. Perform a cylinder compression test.
28
4. Inspect for bent pushrods, worn rocker arms, broken
or weak valve springs, and a worn camshaft.
5. Perform repairs as needed.
Are all of the checks and needed repairs complete?
EXCESSIVE EXHAUST EMISSIONS OR ODORS
Definition: A vehicle fails an emission test. The vehicle has an excessive rotten egg smell. Excessive odors do not
necessarily indicate excessive emissions.
Step
Were the Important Preliminary Checks performed?
1
1. Run the engine until it reaches operating
temperature.
2
2. Perform an emission test.
Did the vehicle pass the emission test?
1. Connect the scan tool to the Data Link Connector
(DLC).
2. Road test the vehicle.
3
3. Monitor the long term fuel trim memory.
Is the long term fuel trim memory within the value
specified?
Is the long term fuel trim memory below the value
specified?
4
Is the long term fuel trim memory above the value
specified?
5
1. Check for a properly installed fuel cap.
2. Check the fuel system pressure.
6
3. Perform an injector balance test.
Is the problem found?
Rough, Unstable, or Incorrect Idle, Stalling (Cont'd)
Action
Action
Value(s)
Yes
–
System OK
12-16 v
Go to Step 27
–
System OK
–
System OK
Value(s)
Yes
–
Go to Step 2
–
System OK
–20%~25%
Go to Step 6
Go to
"Diagnostic Aids
–20%
for DTC P0172"
Go to
"Diagnostic Aids
25%
for DTC P0171"
–
Go to Step 7
No
–
Go to Step 28
–
–
No
Go to
"Important
Preliminary
Checks"
Go to Step 3
Go to Step 4
Go to Step 5
–
Go to Step 8
DAEWOO T-154 BL2,3
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