Isuzu KB P190. Manual — part 603
6E–242
ENGINE DRIVEABILITY AND EMISSIONS
SURGES AND/OR CHUGS SYMPTOM
DEFINITIONS: See the illustration below. Feels like the
vehicle speeds up and slows down with no charge in the
accelerator pedal.
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
Be sure that the driver understands A/C compressor
operation as explained in the owner’s manual. Inform
the customer how the A/C clutch operate.
Is the customer experiencing a normal condition?
—
System OK
Go to Step 5
5
1. Using a Tech 2, display the MAP sensor value in
comparison with atmosphere temperature.
2. Check for a faulty, plugged, or incorrectly installed
MAP sensor.
Was the problem found?
—
Verify repair
Go to Step 6
6
Observe the throttle position display on the Tech 2
while slowly increasing throttle pedal.
Is the throttle position at the specified value and
steady in any position?
—
Go to Step 7
Refer to
Diagnostic
Trouble Code
P0123 for
further
diagnosis
7
Check the knock sensor wire, shield wire, or
installation condition.
Was a problem found?
—
Verify repair
Go to Step 8
8
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 an excessively lean air/fuel mixture.
Was a problem found?
—
Verify repair
Go to Step 9
ENGINE DRIVEABILITY AND EMISSIONS
6E–243
9
Check the fuel pressure. Refer to 6E-108 page“Fuel
System Diagnosis
”
.
Was a problem found?
—
Verify repair
Go to Step 10
10
Monitor “B1S1 (Bank 1 Sensor 1) Status” on the Tech
2.
Is the “B1S1 (Bank 1 Sensor 1) Status” in the rich
condition?
—
Verify repair
Go to Step 11
11
Check items that can cause the engine to run rich.
Refer to DTC P1167 “Fuel Supply System Rich During
Deceleration Fuel Cut Off”.
Was a problem found?
—
Verify repair
Go to Step 12
12
Check items that can cause the engine to run lean.
Refer to DTC P1171 “Fuel Supply System Lean
During Power Enrichment”.
Was a problem found?
—
Verify repair
Go to Step 13
13
Check for proper ignition voltage output with the spark
tester.
Was a problem found?
—
Verify repair
Go to Step 14
14
Check for a loose ignition control module ground.
Was a problem found?
—
Verify repair
Go to Step 15
15
Visually/physically inspect all spark plug high-tension
cables. Check for the following conditions:
• Verify that the resistance of all spark plug high-
tension cables are less than the specified value.
• Verify that the all spark plug high-tension cables are
correctly fitted to eliminate cross-fitting.
• Verify that the all spark plug high-tension cables are
not arcing to ground.
Spraying the spark plug high-tension cables with a
light mist of water may help locate an intermittent
problem.
Was a problem found?
#1 cyl. 4.4k
Ω
#2 cyl. 3.6k
Ω
#3 cyl. 3.1k
Ω
#4 cyl. 2.8k
Ω
Verify repair
Go to Step 16
16
1. Check the ignition coil secondary resistance.
2. Replace the coil if it is greater than the specified
resistance.
Did the coil require replacement?
2.5k
Ω
Verify repair
Go to Step 17
17
1. Remove the spark plugs and check for gas or oil
fouling cracks, wear, improper gap, burned
electrodes, heavy deposits, or improper heat
range.
2. If spark plugs are fouled, the cause of fouling must
be determined before replacing the spark plugs.
Was a problem found?
—
Verify repair
Go to Step 18
18
1. Check the injector connectors.
2. If any of the connectors are connected at an
improper cylinder, connect as necessary.
Was a problem found?
—
Verify repair
Go to Step 19
19
Check the ECM grounds to verify that they are clean
and tight. Refer to the ECM wiring diagrams.
Was a problem found?
—
Verify repair
Go to Step 20
20
Visually/physically check the vacuum hose for splits,
kinks and proper connections and routing.
Was a problem found?
—
Verify repair
Go to Step 21
Step
Action
Value(s)
Yes
No
6E–244
ENGINE DRIVEABILITY AND EMISSIONS
21
Check the exhaust system for a possible restriction:
• Damaged or collapsed pipes
• Internal muffler failure
Was a problem found?
—
Verify repair
Go to Step 22
22
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 23
23
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 24
24
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–245
HESITATION, SAG, STUMBLE SYMPTOM
DEFINITIONS: Momentary lack of response as the
accelerator is pushed down. Can occur at any vehicle
speed. Usually most pronounced when first trying to
make the vehicle move, as from a stop sign. May cause
the engine to stall if severe enough.
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 the fuel quality.
Is the customer using improper fuel or degraded fuel?
—
Replace fuel
Go to Step 5
5
1. Using a Tech 2, display the MAP sensor value in
comparison with atmosphere temperature.
2. Check for a faulty, plugged, or incorrectly installed
MAP sensor.
Was the problem found?
—
Verify repair
Go to Step 6
6
Observe the throttle position display on the Tech 2
while slowly increasing throttle pedal.
Does the throttle position increase steady with
increasing smoothly?
—
Go to Step 7
Refer to
Diagnostic
Trouble Code
P0123 for
further
diagnosis
7
Check the knock sensor wire, shield wire, or
installation condition.
Was a problem found?
—
Verify repair
Go to Step 8
8
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 9
9
Check the fuel pressure. Refer to 6E-108 “Fuel
System Diagnosis
”
.
Was a problem found?
—
Verify repair
Go to Step 10
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст