Isuzu Trooper (1998-2002 year). Manual — part 525
6E–470
6VE1 3.5 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 the 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–471
6VE1 3.5L 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 13
Go to
Step 3
3
Was a thorough visual/physical check performed?
—
Go to
Step 4
Go to
Visual/
Physical
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 13
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 13
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 13
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 13
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 13
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 13
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 13
Go to
Step 11
11
1. Check EVAP canister for fuel loading. Refer to
Evaporative Emission Control System.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Go to
Step 13
Go to
Step 12
6E–472
6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS
Excessive Exhaust Emissions or Odors Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
12
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 14
13
Perform the exhaust emission test.
Does the vehicle pass the test?
—
System OK
Go to
Step 14
14
Does the exhaust emission test indicate excessive CO
and HC levels or is long term fuel trim significantly in the
negative range (rich condition)?
—
Go to
Step 15
Go to
Step 16
15
1. Check items that can cause the engine to run rich.
Refer to
Diagnostic Aids in DTC P0172 Diagnostic
Support. Make any necessary repairs.
2. Perform the exhaust emission test.
Does the vehicle pass the test?
—
System OK
Go to
Step 17
16
1. Check items that can cause the engine to run lean.
Refer to
Diagnostic Aids in DTC P0171 Diagnostic
Support. Make any necessary repairs.
2. Perform the exhaust emission test.
Does the vehicle pass the test?
—
System OK
Go to
Step 17
17
1. Check the EGR system (refer to
DTC P0401).
2. If a problem is found, repair as necessary.
Was a problem found?
—
Go to
Step 13
Go to
Step 18
18
1. Check for an engine mechanical problem.
Perform a cylinder compression check (refer to
Engine Mechanical).
2. If a problem is found, repair as necessary.
Was a problem found?
—
Go to
Step 13
Go to
Step 19
19
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
6E–473
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Dieseling, Run-On Symptom
Step
Action
Value(s)
Yes
No
1
DEFINITION:
Engine continues to run after key is turned “OFF,” but
runs very rough. If engine runs smooth, check ignition
switch and adjustment.
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
1. Check for a short between B+ and any of the ignition
feed circuits.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 5
5
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
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