Opel Frontera UBS. Service manual — part 345
6E–286
ENGINE DRIVEABILITY AND EMISSIONS
Hesitation, Sag, Stumble Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
10
1. Check for proper ignition voltage output with spark
tester J 26792 (ST-125). Refer to
Electronic Ignition
System for the procedure.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 11
11
1. Check for a loose ignition coil ground.
Refer to
Electronic Ignition System.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 12
12
1. Check the 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 13
13
1. Remove spark plugs and check for wet plugs,
cracks, wear, improper gap, burned electrodes, or
heavy deposits. Refer to
Electronic Ignition
System.
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 14
14
1. Check the PCM grounds for clearness, tightness
and proper routing. Refer to the PCM wiring
diagrams in Electrical Diagnosis.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 15
15
1. Check the MAF sensor connections.
2. If a problem is found, replace the faulty terminals as
necessary. Refer to
Electrical Diagnosis for wiring
repair procedures.
Was a problem found?
—
Verify repair
Go to
Step 16
16
1. Visually/physically check vacuum hoses for splits,
kinks, and proper 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 17
6E–287
ENGINE DRIVEABILITY AND EMISSIONS
Hesitation, Sag, Stumble Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
17
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 butter
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
18
Replace the TP sensor.
Is the action complete?
—
Verify repair
—
6E–288
ENGINE DRIVEABILITY AND EMISSIONS
Default Matrix Table
Service Procedure Default Strategy
A referral strategy has been established to assist the
technician with additional information when the cause of
the failure cannot be determined. If no problem is found
after performing diagnostics, then refer to the default
matrix table for further diagnostic information.
Default Matrix Table
Strategy Based Diagnostic Charts
Initial Diagnosis
Default Section(s)
On-Board Diagnostic (OBD) System
Check
Vehicle does not enter diagnostics.
Chassis Electrical
On-Board Diagnostic (OBD) System
Check
Vehicle enters diagnostics and
communicates with Tech 2. MIL is
“ON” in diagnostics. Engine does not
start and run.
Ignition System Check
On-Board Diagnostic (OBD) System
Check
Engine starts and runs, no PCM
codes set. Customer complains of
vibration.
—
On-Board Diagnostic (OBD) System
Check
Engine starts and runs, no PCM
codes set. Customer complains of
harsh or soft shift, poor performance,
delayed or no engagement into drive
or reverse, transmission fluid leak,
transmission noise or vibration, or
improper TCC operation.
Automatic Transmission
PCM Power and Ground Check
On-Board Diagnostic (OBD) System
Check.
Chassis Electrical
PCM Power and Ground Check
On-Board Diagnostic (OBD) System
Check. PCM power and ground
circuits OK. Data link voltage
incorrect.
Chassis Electrical
On-Board Diagnostic (OBD) System
Check
Engine starts and runs, no PCM
codes set. Customer complains of
harsh or soft shift, poor performance,
delayed or no engagement into drive
or reverse, transmission fluid leak,
transmission noise or vibration, or
improper TCC operation.
Automatic Transmission
Symptoms
Initial Diagnosis
Default Section(s)
Intermittents
1. On-board Diagnostic (OBD)
system check.
2. Careful visual/physical
inspections.
Chassis Electrical
Hard Starts
1. OBD system check.
2. Sensors (ECT, MAP, MAF, TP) ;
MAP output chart.
3. Fuel system electrical test, fuel
system diagnosis.
4. Ignition system.
5. IAC system check.
Engine Mechanical, Ignition
System Check, Exhaust System
Diagnosis
Surges and/or Chuggles
1. OBD system check.
2. Heated oxygen sensors.
3. Fuel system diagnosis.
4. Ignition system.
Calibration ID “Broadcast
Code”/Service Bulletins, Ignition
System Check, Generator
Output, Exhaust System
Diagnosis, 4L30-E System Test
6E–289
ENGINE DRIVEABILITY AND EMISSIONS
Symptoms
Default Section(s)
Initial Diagnosis
Lack of Power, Sluggish or Spongy
1. OBD system check.
2. Fuel system diagnosis.
3. Ignition system.
4. Knock sensor.
5. EGR operation.
6. EGR system check.
Refer to
Exhaust System in
Engine Exhaust, TCC Operation,
Calibration ID/Service Bulletins
Detonation/Spark Knock
1. OBD system check.
2. Transmission range switch.
3. EGR operation.
4. EGR system check.
5. TCC operation.
6. Fuel system diagnosis.
7. Ignition system.
8. Knock sensor.
TCC operation, Cooling System,
Ignition System Check,
Calibration ID/Service Bulletins
Hesitation, Sag, Stumble
1. OBD system check.
2. TP.
3. MAP output check.
4. Fuel system diagnosis.
5. Fuel injector and fuel injector
balance test.
6. Ignition system.
EGR Operation, EGR System
Check, Generator Output
Voltage (refer to
Chassis
Electrical), Calibration ID/Service
Bulletins, Ignition System Check
Cuts Out, Misses
1. OBD system check.
2. Cylinder balance test.
Ignition System Check
Rough, Unstable, or Incorrect Idle,
Stalling
1. OBD system check.
2. Fuel injector and fuel injector
balance test.
3. Ignition system.
4. IAC operation.
5. EGR operation.
MAP Output Check, Throttle
Linkage, IAC System Check,
EGR System Check, A/C Clutch
Control Circuit Diagnosis,
Crankcase Ventilation System,
Calibration ID/Service Bulletins,
Generator Output Voltage (refer
to
Chassis Electrical), Exhaust
Diagnosis
Poor Fuel Economy
1. OBD system check.
2. Careful visual/physical inspection.
3. Ignition system.
4. Cooling system.
TCC Operation, Exhaust System
(refer to
Engine Exhaust)
Engine Cranks But Will Not Run
1. OBD system check.
Fuel System Electrical
Diagnosis, Fuel System
Diagnosis, Fuel Injector and Fuel
Injector Balance Test.
Excessive Exhaust Emissions or
Odors
1. OBD system check.
2. Emission test.
3. Cooling system.
4. Fuel system diagnosis.
5. Fuel injector and fuel injector
balance test.
6. Crankcase ventilation system.
7. Ignition system.
8. MAP output check.
EGR System Check, Exhaust
Diagnosis, Calibration ID/Service
Bulletins
Dieseling, Run-On
1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.
—
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