Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 248
ENGINE DRIVEABILITY AND EMISSIONS
6E–233
17
Perform the procedure in Fuel System Pressure Test
to determine if there is a problem with fuel delivery.
Was a problem found?
—
Verify repair
Go to Step 18
18
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
• Camshaft drive belt slipped or stripped
Was a problem found?
—
Verify repair
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:
• 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 20
20
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 21
21
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 immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.
—
Verify Repair
—
Step
Action
Value(s)
Yes
No
6E–234
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–235
9
Check the fuel pressure. Refer to 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–236
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 immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.
—
Verify Repair
—
Step
Action
Value(s)
Yes
No
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