2004 ISUZU TF SERIES Workshop Manual

wheel torque bonnet brake pads oil coolant temperature language

Page 2809 of 4264

ISUZU TF SERIES 2004 Workshop Manual ENGINE DRIVEABILITY AND EMISSIONS 6E–233
ENGINE CRANKS BUT WILL NOT RUN
DEFINITIONS: Engine cranks, but will not run. (The engine never start.)
NOTE: The replacement ECM must be programmed. Refer to

ENGINE DRIVEABILITY AND EMISSIONS 6E–233
ENGINE CRANKS BUT WILL NOT RUN
DEFINITIONS: Engine cranks, but will not run. (The engine never start.)
NOTE: 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.
NOTE: The vehicle with immobilizer system, this system may be activated. Check the immobilizer system diagosis.
Step Action Value(s) Yes No
1Was the “On-Board Diagnostic (OBD) System Check”
performed?—Go to Step 2Go 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 visually/physical check performed?
—Go to Step 4Go to Visual /
physical Check.
4 Check the “Ignition coil” fuse (15A) and “ECM” fuse
(15A).
Was a fuse blown?—Verify repair Go to Step 5
5 1. Ignition ON
2. Use a DVM to verify that battery voltage at the
ignition coil fuse, and the ECM fuse.
Was battery voltage presented at the fuses?—Go to Step 6Verify & repair
6 1. Visually/physically inspect for the following
conditions:
Restriction of air intake system. Check for a
restricted air filter element, or foreign objects
blocking the air intake system.
Check for objects blocking the IAC passage or
throttle bore, excessive deposits in the throttle
bore and on the throttle plate.
Check for a condition that causes a large
vacuum leak, such as an incorrectly installed or
faulty crankcase ventilation hose/brake booster
hose.
Was a problem found?—Verify repair Go to Step 7
7 1. Using a Tech 2, display the IAC value.
2. Check for a faulty, plugged, or sticking IAC
operation.
Was the problem found?—Verify repair Go to Step 8
8 1. Using a Tech 2, display the MAP sensor value.
2. Check for a faulty, plugged, or incorrectly installed
MAP sensor.
Was the problem found?—Verify repair Go to Step 9
9 If oscilloscope is available, check the wave form of the
CKP signal.
Was the correct wave form found?—Go to Step 12Go to Step 10
10 Check the CKP sensor wire for open or short circuit.
Was a problem found?—Verify repair Go to Step 11
11 Replace CKP sensor.
Is there still problem?—Replace pulsar
ring. Verify repair

Page 2810 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–234 ENGINE DRIVEABILITY AND EMISSIONS
12 Visually/physically inspect the secondary ignition
wires. Check for the following conditions:
Verify that all ignition wire resistance are less than
the

6E–234 ENGINE DRIVEABILITY AND EMISSIONS
12 Visually/physically inspect the secondary ignition
wires. Check for the following conditions:
Verify that all ignition wire resistance are less than
the specified value.
Verify that ignition wires are correctly routed to
eliminate cross-fitting.
Verify that ignition wires are not arcing to ground.
Spraying the secondary ignition wires with a light
mist of water may help locate an intermittent
problem.
Was a problem found?#1 cyl. 4.4k
#2 cyl. 3.6k
#3 cyl. 3.1k
#4 cyl. 2.8kVerify repair Go to Step 13
13 1. Disconnect the spark plug high tension cable from
No.1 spark plug.
2. Install a spark tester at the end of the
disconnected ignition coil.
3. Clip the spark tester to a good ground.
4. Observe the spark tester while the engine is
cranking.
Was a crisp blue spark observed? (Only one or two
sparks followed by no result is considered the same
as “No Spark”.)—Go to Step 21Go to Step 14
14 1. Disconnect the ignition coil harness connector.
2. Check for an open or short circuit between the
ignition coil and the ECM.
Was a problem found?—Verify repair Go to Step 15
15 1. Ignition “On”.
2. Using a Digital Voltmeter (DVM) check the ignition
wire coil at the ignition coil harness connector.
Was the voltage equal to the specified value?Battery
voltage Go to Step 16Verify repair
16 1. Ignition “Off”.
2. With DVM, check for an open in the ground wire at
the ignition coil harness connector.
Was the ground wire OK?—Go to Step 17Verify repair
17 Replace the ignition coil, verify the repair.
Attempt to start the engine.
Is there still a problem?—Go to Step 18Verify repair
18 Use an ohmmeter to check the ignition coil primary
winding resistance.
Was the primary winding resistance approximately
equal to the specified value? 0.8-18kGo to Step 19Go to Step 20
19 Use an ohmmeter to check the ignition coil secondary
winding resistance.
Was the primary winding resistance hear around the
to the specified value? 2.5kGo to Step 21Go to Step 20
20 Replace the ignition coil.—Veri fy repai r—
21 1. Remove the spark plugs from all cylinders.
2. Visually inspect the spark plug electrodes.
3. Replace any spark plugs with loose or missing
electrodes or cracked insulators.
Did your inspection reveal any spark plugs exhibiting
ex cessive fouling?—Correct the
fouling
condition Go to Step 22 Step Action Value(s) Yes No

Page 2811 of 4264

ISUZU TF SERIES 2004 Workshop Manual ENGINE DRIVEABILITY AND EMISSIONS 6E–235
22 Perform the procedure in Fuel System Pressure Test
(Refer to 6E-108 Fuel System Diagnosis) to
determine if there is a problem with fuel delivery.
Was a

Page 2812 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–236 ENGINE DRIVEABILITY AND EMISSIONS
HARD START SYMPTOM
DEFINITIONS: Engine cranks, but does not start for a long time. Does eventually start, of may start and then
immediately stall.
Step Actio

Page 2813 of 4264

ISUZU TF SERIES 2004 Workshop Manual ENGINE DRIVEABILITY AND EMISSIONS 6E–237
7 1. Using a Tech 2, display the engine coolant
temperature and note the value.
2. Check the resistance of the engine coolant
temperature sensor.
Is the actu

ENGINE DRIVEABILITY AND EMISSIONS 6E–237
7 1. Using a Tech 2, display the engine coolant
temperature and note the value.
2. Check the resistance of the engine coolant
temperature sensor.
Is the actual resistance near the resistance value in
the chart for the temperature that was noted?
—Go to Step 8Replace the
ECT sensor.
Verify repair
8 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 9
9 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
#2 cyl. 3.6k
#3 cyl. 3.1k
#4 cyl. 2.8kVerify repair Go to Step 10
10 Check for proper ignition voltage output with a spark
tester.
Was the problem found?—Verify repair Go to Step 11
11 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 12
12 Check for a loose ignition control module ground.
Was a problem found?—Verify repair Go to Step 13
13 1. Check the ignition coil secondary resistance.
2. Replace the coil if it is greater than the specified
resistance.
Did the coil require replacement? 2.5kVerify repair Go to Step 14 Step Action Value(s) Yes No
Temperature (°C) Resistance () (Approximately)
-20 26740
09120
20 3500
40 1464
60 664
80 333
100 175
120 102

Page 2814 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–238 ENGINE DRIVEABILITY AND EMISSIONS
14 Drain sample fuel, visual inspection.
Any suspecion about the fuel, such as discoloration,
particle, contamination, water, unusual smell, then
drain the f

Page 2815 of 4264

ISUZU TF SERIES 2004 Workshop Manual ENGINE DRIVEABILITY AND EMISSIONS 6E–239
ROUGH, UNSTABLE, OR INCORRECT IDLE, STALLING SYMPTOM
DEFINITIONS: Engine runs unevenly at idle. If severe,
the engine or vehicle may shake. Engine idle speed

Page 2816 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E–240 ENGINE DRIVEABILITY AND EMISSIONS
7 1. Using a Tech 2, display the engine coolant
temperature and note the value.
2. Check the resistance of the engine coolant
temperature sensor.
Is the actu

6E–240 ENGINE DRIVEABILITY AND EMISSIONS
7 1. Using a Tech 2, display the engine coolant
temperature and note the value.
2. Check the resistance of the engine coolant
temperature sensor.
Is the actual resistance near the resistance value in
the chart for the temperature that was noted?
—Go to Step 8Replace the
ECT sensor.
Verify repair
8 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 9
9 Using Tech 2, monitor throttle position with the engine
idling.
Is the throttle position at the specified value and
steady?
0% Go to Step 10Refer to
Diagnostic
Trouble Code
P0123 for
further
diagnosis
10 Check for proper ignition voltage output with the spark
tester.
Was a problem found?—Verify repair Go to Step 11
11 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 12
12 Check for a loose ignition control module ground.
Was a problem found?—Verify repair Go to Step 13
13 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 14
14 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 15
15 Check the injector connectors, if any of the injectors
are connected any incorrect cylinder, correct as
necessary.
Was a problem found?—Verify repair Go to Step 16
16 1. Check for faulty engine mounts.
2. If a problem is found, repair as necessary.
Was a problem found?—Verify repair Go to Step 17 Step Action Value(s) Yes No
Temperature (°C) Re sista nce () (Appro x imately)
-20 26740
09120
20 3500
40 1464
60 664
80 333
100 175
120 102

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