Opel Frontera UBS. Service manual — part 1227
6E–274
ENGINE DRIVEABILITY AND EMISSIONS
Rough, Unstable, or Incorrect Idle, Stalling Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
17
1. Check ignition coils for cracks or carbon tracking.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 18
18
Using Tech 2, monitor the throttle position (TP) angle
with the engine idling.
Is the TP angle at the specified value and steady?
0%
Go to
Step 19
Refer to
DTC
P0123 for
further
diagnosis
19
1. Check the positive crankcase ventilation (PCV)
valve for proper operation. Refer to
Crankcase
Ventilation System.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 20
20
1. Check the transmission range switch circuit. Use
Tech 2 and be sure Tech 2 indicates that the vehicle
is in drive with the gear selector in drive or overdrive.
2. If a problem is found, diagnose and repair the
transmission range switch as necessary (refer to
4L30-E Automatic Transmission Diagnosis).
Was a problem found?
—
Verify repair
Go to
Step 21
21
1. Check for the following engine mechanical items.
Refer to
Engine Mechanical for diagnosis
procedures:
D
EGR valve mounted backward. Compare with
a known-good vehicle.
D
Low compression
D
Sticking or leaking valves
D
Worn camshaft lobe(s)
D
Camshaft drive belt slipped or stripped
D
Incorrect valve timing
D
Worn rocker arms
D
Broken valve springs
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 22
22
1. Check for faulty motor mounts. Refer to
Engine
Mechanical for inspection of mounts.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 23
23
1. Review all diagnostic procedures within this table.
2. If all procedures have been completed and no
malfunctions have been found, review/inspect the
following:
D
Visual/physical inspection
D
Tech 2 data
D
Freeze Frame data/Failure Records buffer
D
All electrical connections within a suspected
circuit and/or system.
3. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Contact
Technical
Assistance
6E–275
ENGINE DRIVEABILITY AND EMISSIONS
Poor Fuel Economy Symptom
Step
Action
Value(s)
Yes
No
1
DEFINITION:
Fuel economy, as measured by an actual road test, is
noticeably lower than expected. Also, economy is
noticeably lower than it was on this vehicle at one time,
as previously shown by an actual road test.
(Non-standard tires will cause odometer readings to be
incorrect, and that may cause fuel economy to appear
poor when it is actually normal.)
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
—
Verify repair
Go to
Step 3
3
Was a visual/physical check performed?
—
Go to
Step 4
Go to
Visual/Physic
al Check
4
Check owner’s driving habits.
D
Is the A/C “ON” full time (defroster mode “ON”)?
D
Are tires at the correct pressure?
D
Are excessively heavy loads being carried?
D
Is acceleration too much, too often?
Was a problem found?
—
Go to
Step 5
Go to
Step 6
5
Review the items in Step 4 with the customer and
advise as necessary.
Is the action complete?
—
System OK
—
6
1. Visually/physically check: Vacuum hoses for splits,
kinks, and improper connections and routing as
shown on the “Vehicle Emission Control
Information” label.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 7
7
1. Remove and check the air filter element for dirt or for
restrictions. Refer to
Air Intake System.
2. Replace the air filter element if necessary.
Was a repair required?
—
Verify repair
Go to
Step 8
8
1. Remove spark plugs and check for wet plugs,
cracks, wear, improper gap, burned electrodes, or
heavy deposits. Refer to
Spark Plug Replacement.
NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 9
9
1. Check for low engine coolant level. Refer to
Engine
Cooling.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 10
6E–276
ENGINE DRIVEABILITY AND EMISSIONS
Poor Fuel Economy Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
10
1. Check for an incorrect or faulty engine thermostat.
Refer to
Engine Cooling.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 11
11
1. Check for low engine compression. Refer to
Engine
Mechanical.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 12
12
1. Check the TCC operation. Refer to
4L30-E
Transmission Diagnosis.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 13
13
1. Check the exhaust system for possible restriction:
D
Inspect the exhaust system for damaged or
collapsed pipes.
D
Inspect the muffler for heat distress or possible
internal failure.
D
Check for a possible plugged three-way
catalytic converter by checking the exhaust
system back pressure. Refer to
Restricted
Exhaust System Check.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 14
14
Check for proper calibration of the speedometer.
Does the speed indicated on the speedometer closely
match the vehicle speed displayed on Tech 2?
—
Go to
Step 16
Go to
Step 15
15
Diagnose and repair an inaccurate speedometer
condition as necessary. Refer to
Vehicle Speed
Sensor in Electrical Diagnosis.
Was a problem found?
—
Verify repair
—
16
1. Check the air intake system and the crankcase for
air leaks. Refer to
Air Intake System and
Crankcase Ventilation System.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 17
17
1. Review all diagnostic procedures within this table.
2. When all procedures have been completed and no
malfunctions have been found, review/inspect the
following:
D
Visual/physical inspection
D
Tech 2 data
D
Freeze Frame data/Failure Records buffer
D
All connections within a suspected circuit
and/or system.
3. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 18
18
Perform the procedure in
Fuel System Pressure Test.
Was the fuel pressure normal?
—
Contact
Technical
Assistance
Verify repair
6E–277
ENGINE DRIVEABILITY AND EMISSIONS
Excessive Exhaust Emissions or Odors Symptom
Step
Action
Value(s)
Yes
No
1
DEFINITION:
Vehicle fails an emission test. Vehicle has excessive
“rotten egg” smell. (Excessive odors do not necessarily
indicate excessive emissions.)
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
—
Go to
Step 12
Go to
Step 3
3
Was a thorough visual/physical check performed?
—
Go to
Step 4
Go to
Visual/Physic
al Check
4
1. Check for vacuum leaks. Check vacuum lines,
intake manifold, throttle body, etc.
2. If a problem is found, repair as necessary.
Were any vacuum leaks located?
—
Go to
Step 12
Go to
Step 5
5
1. Check the fuel cap for proper installation.
2. Secure the fuel cap if necessary.
Was the fuel cap installed properly?
—
Go to
Step 6
Go to
Step 12
6
1. Check the fuel pressure. Perform the procedure in
Fuel System Pressure Test.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Go to
Step 12
Go to
Step 7
7
1. Check for a faulty, plugged, or incorrectly installed
crankcase ventilation valve; also check the
crankcase ventilation system for plugging.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Go to
Step 12
Go to
Step 8
8
1. Check the injector connections.
2. If any of the injectors are connected to an incorrect
cylinder, correct as necessary.
Was a problem found?
—
Go to
Step 12
Go to
Step 9
9
1. Perform the “Injector Coil/Balance Test” in
Fuel
Metering System.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Go to
Step 12
Go to
Step 10
10
1. Refer to
Engine Cooling for cooling system
diagnosis.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Go to
Step 12
Go to
Step 11
11
1. Remove excessive carbon buildup with a top engine
cleaner. Refer to the instructions on the top engine
cleaner can.
2. Perform the exhaust emission test.
Does the vehicle pass the test?
—
System OK
Go to
Step 13
12
Perform the exhaust emission test.
Does the vehicle pass the test?
—
System OK
Go to
Step 13
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