Isuzu KB P190. Manual — part 607
6E–258
ENGINE DRIVEABILITY AND EMISSIONS
EXCESSIVE EXHAUST EMISSIONS OR ODORS SYMPTOM
DEFINITIONS: Vehicle fails an emission test. There is excessive “rotten egg” smell. (Excessive odors do not
necessarily indicate excessive emissions.)
Step
Action
Value(s)
Yes
No
1
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
Does the customer continual accelerate On/Off during
cold condition?
—
System OK
Go to Step 5
5
Is the customer using the incorrect fuel type?
—
Replace with
unleaded fuel
Go to Step 6
6
Check for vacuum leaks (vacuum lines, intake
manifold, throttle body, etc.)
Were any vacuum leaks found?
—
Go to Step 17
Go to Step 7
7
1. Check fuel cap for proper installation.
2. Secure the fuel cap if necessary.
Was a problem found?
—
Go to Step 17
Go to Step 8
8
Check the fuel pressure. Refer to 6E-108 page “Fuel
System Diagnosis” .
Was a problem found?
—
Go to Step 17
Go to Step 9
9
1. Check for faulty, plugged or incorrectly installed
PCV valve.
2. Verify that the PCV system is not plugged.
Was a problem found?
—
Go to Step 17
Go to Step 10
10
Check the injector connectors, if any of the injectors
are connected to an incorrect cylinder, correct as
necessary.
Was a problem found?
—
Go to Step 17
Go to Step 11
11
Perform the “Injector Coil/Balance Test
”
(Refer to 6E-
98 page).
Was a problem found.
—
Go to Step 17
Go to Step 12
12
Check for a problem with the engine cooling system.
Was a problem found?
—
Go to Step 17
Go to Step 13
13
Check EVAP canister for fuel loading. Refer to
Evaporative Emission Control System.
Was a problem found?
—
Go to Step 17
Go to Step 14
14
Check the EVAP purge solenoid valve operation.
Is the valve operated normally?
—
Go to Step 17
Verify repair &
Go to Step 15
15
Check the exhaust system for a possible restriction:
• Damaged or collapsed pipes
• Internal catalytic converter failure
Was a problem found?
—
Verify repair &
Go to Step 16
Go to Step 17
ENGINE DRIVEABILITY AND EMISSIONS
6E–259
16
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 18
17
Perform the exhaust emission test.
Does the vehicle pass the test?
—
System OK
Go to Step 18
18
Run Engine.
Check the fuel control Heated Oxygen Sensor
(HO2S). When monitored on the Tech 2, the HO2S
should respond quickly to different throttle positions. If
it doesn’t check for silicon or other contaminates from
fuel or use of improper sealant. The sensors may
have a white powdery coating. Silicon contamination
sends a rich exhaust signal which causes the ECM to
command and excessively lean air/fuel mixture.
Was a problem found?
—
Verify repair
Go to Step 19
19
Monitor “B1S1 (Bank 1 Sensor 1) Status” on the Tech
2.
Is the “B1S1 (Bank 1 Sensor 1) Status” in the rich
condition?
—
Go to Step 20
Go to Step 21
20
1. Check items that can cause the engine to run rich.
Refer to Diagnostic Aids in DTC P1167 “Fuel
Supply System Rich During Deceleration Fuel Cut
Off”. Make any necessary repairs.
2. Perform the exhaust emission test.
Does the vehicle pass the test?
—
System OK
Go to Step 22
21
1. Check items that can cause the engine to run
lean. Refer to Diagnostic Aids in DTC P1171 “Fuel
Supply System Lean During Power Enrichment”.
Make any necessary repairs.
2. Perform the exhaust emission test.
Does the vehicle pass the test?
—
System OK
Go to Step 22
22
Check for the following engine mechanical problems
(refer to Engine Mechanical):
• Low compression
• Leaking cylinder head gaskets
• Worn camshaft
• Sticking or leaking valves
• Valve timing
• Broken valve springs
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:
• Visual/physical inspection
• Tech 2 data
• All electrical connections within a suspected
circuit and/or system
Was a problem found?
—
Verify repair
Go to Step 24
Step
Action
Value(s)
Yes
No
6E–260
ENGINE DRIVEABILITY AND EMISSIONS
24
Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?
—
Verify repair
Go to Step 25
25
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.
—
Verify Repair
—
Step
Action
Value(s)
Yes
No
ENGINE DRIVEABILITY AND EMISSIONS
6E–261
DIESELING, RUN-ON SYMPTOM
DEFINITIONS: Engine continues to run after key is turned OFF, but runs very rough. If engine runs smoothly, check
the ignition switch and adjustment.
Step
Action
Value(s)
Yes
No
1
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 for a short between battery voltage and the
ignition feed circuit.
Was a problem found?
—
Verify repair
Go to Step 5
5
Check the fuel leaking from injector. Refer to Fuel
System Diagnostic.
Was the problem found?
—
Verify repair
Go to Step 6
6
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:
• Visual/physical inspection
• Tech 2 data
• All electrical connections within a suspected
circuit and/or system
Was a problem found?
—
Verify repair
Go to Step 7
7
Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?
—
Verify repair
Go to Step 8
8
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.
—
Verify repair
—
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