Opel Frontera UBS. Service manual — part 1397
6E–182
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Lack of Power, Sluggish or Spongy Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
11
1. Check for an engine mechanical problem. Check
for low compression, incorrect or worn camshaft,
loose timing belt, etc. 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. 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–183
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Rough, Unstable, or Incorrect Idle, Stalling Symptom
Step
Action
Value(s)
Yes
No
1
DEFINITION:
Engine runs unevenly at idle. If severe, the engine or
vehicle may shake. Engine idle speed may vary in
RPM. Either condition may be severe enough to stall
the engine.
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 6
Go to
Step 3
3
Was a visual/physical check performed?
—
Go to
Step 4
Go to
Visual/
Physical
Check
4
1. Check the ECM grounds for cleanliness, tightness
and proper routing. Refer to the ECM wiring
diagrams in
Electrical Diagnosis.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 5
5
1. Check for incorrect idle speed. Ensure that the
following conditions are present:
D
The engine is fully warm.
D
The accessories are “OFF.”
2. Using a Tech 2, monitor the AP position.
Is the AP position within the specified values?
0%
Go to
Step 10
Go to
Step 9
6
1. Visually/physically inspect for the following
conditions:
D
Restricted air intake system. Check for a
possible collapsed air intake duct, restricted
air filter element, or foreign objects blocking
the air intake system.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 7
7
1. Injector Test
Operate the each injector by Tech 2 with the
ignition “ON” and check if the working noise
confirm.
2. If a problem is found, check the harness or replace
the injector.
Is the action complete?
—
Verify repair
Go to
Step 8
8
1. Check the transmission range switch circuit. Use a
Tech 2 and be sure the 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
Automatic Transmission Diagnosis).
Was a problem found?
—
Verify repair
Go to
Step 9
6E–184
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Rough, Unstable, or Incorrect Idle, Stalling Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
9
1. Check for the following engine mechanical items.
Refer to
Engine Mechanical for diagnosis
procedures:
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
Valves clearance
D
Broken valve springs
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 10
10
1. Check for faulty engine 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 11
11
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–185
4JX1–TC 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. (Larger than
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/
Physical
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?
D
Is engine oil correct?
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 repair required?
—
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. 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 9
9
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 10
10
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 11
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