Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 184
6E–340
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
32
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
—
33
Replace the injection pump assembly.
Is the action complete?
—
Verify repair
—
Step
Action
Value(s)
Yes
No
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6E–341
POOR FUEL ECONOMY SYMPTOM
DEFINITIONS: Fuel economy, as measured by an actual road test, is noticeably lower than expected. Also, economy
is noticeably lower than it was on this vehicle at one time, as previously shown by an actual road test. (Larger than
standard tires will cause odometer readings to be incorrect, and that may cause fuel economy to appear poor when it
is actually normal.)
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to Step 2
Go to On Board
Diagnostic
(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 4
Go to Visual /
physical Check.
4
Check owner's driving habits.
• Is the A/C “On” full time?
• Are tires at the correct pressure?
• Are excessively heavy loads being carried?
• Is acceleration too much, too often?
—
Go to Step 5
Go to Step 6
5
Review the items in Step 4 with the customer and
advise as necessary.
Is the action complete?
—
System OK
—
6
Check for low engine coolant level.
Was a problem found?
—
Verify repair
Go to Step 7
7
Check for incorrect or faulty engine thermostat. Refer
to Engine Cooling.
Was a problem found?
—
Verify repair
Go to Step 8
8
Check for proper calibration of the speedometer.
Does the speed indicated on the speed meter closely
match the vehicle speed displayed on the Tech 2?
—
Go to Step 10
Go to Step 9
9
Diagnose and repair the inaccurate speedometer
condition as necessary. Refer to Vehicle Speed
Sensor in Electrical Diagnosis.
—
Verify repair
—
10
Check for proper calibration of the fuel gauge.
Was a problem found?
—
Verify repair
Go to Step 11
11
Check the torque converter clutch (TCC) for proper
operation (if A/T model). If a problem is found, repair
as necessary.
Was a problem found?
—
Verify repair
Go to Step 12
12
1. Using the Tech 2, ignition “On” and engine “Off”.
2. Monitor the “Neutral Switch” in the data display.
Does the Tech 2 indicate correct “Neutral Switch”
status depending on any shift positions?
If a problem is found, repair as necessary.
Was the problem found?
—
Verify repair
Go to Step 13
6E–342
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
13
1. Using the Tech 2, ignition “On” and engine “Run”.
2. Monitor the “A/C Information Switch” in the data
display.
Does the Tech 2 indicate correct “A/C Information
Switch” status depending on A/C switch position?
If a problem is found, repair as necessary.
Was the problem found?
—
Verify repair
Go to Step 14
14
Visually/physically inspect for the following conditions.
• Restrict air intake system. Check for a restricted air
filter element, or foreign objects blocking the air
intake system
• Check for objects blocking or 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.
• Restrict air intake system at the turbocharger.
Check for objects blocking the turbocharger
compressor wheel or turbine shaft sticking.
If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to Step 15
15
1. Using the Tech 2, display the ECT sensor and IAT
sensor value.
2. Check the displayed value.
Does the Tech 2 indicate correct temperature
depending on engine condition?
If a problem is found, repair as necessary.
Was the problem found?
—
Verify repair
Go to Step 16
16
1. Using the Tech 2, display the FT sensor value.
2. Check the displayed value.
Does the Tech 2 indicate correct temperature
depending on engine condition?
If a problem is found, repair as necessary.
Was the problem found?
—
Go to Step 31
Go to Step 17
17
1. Using the Tech 2, ignition “On” and engine “Run”.
2. Monitor the “Mass Air Flow” in the data display.
Does the Tech 2 indicate correct “Mass Air Flow”
depending on accelerator pedal operation?
—
Go to Step 22
Go to Step 18
18
Remove the MAF & IAT sensor assembly and check
for the following conditions.
• Objects blocking at the MAF sensor element.
If a problem is found, repair as necessary.
Was the problem found?
—
Verify repair
Go to Step 19
19
Check the MAF sensor harness for the following
conditions.
• Check for poor connector connection.
• Check for misrouted harness.
• Check for any accessory parts which may cause
electric interference.
If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to Step 20
Step
Action
Value(s)
Yes
No
4JH1 ENGINE DRIVEABILITY AND EMISSIONS
6E–343
20
Substitute a known good MAF & IAT sensor assembly
and recheck.
Was the problem solved?
—
Go to Step 21
Go to Step 31
21
Replace the MAF & IAT sensor assembly.
Is the action complete?
—
Verify repair
—
22
1. Using the Tech 2, ignition “On” and engine “Off”.
2. Monitor the “Pedal/Throttle Position” and “Idle
Switch” in the data display.
Does the Tech 2 indicate correct “Pedal/Throttle
Position” from 0% to 100% and correct “Idle Switch”
status depending on accelerator pedal operation?
—
Go to Step 27
Go to Step 23
23
1. Using the Tech 2, ignition “On” and engine “Off”.
2. Monitor the “Pedal/Throttle Position” and “Idle
Switch” in the data display.
3. Adjust the accelerator cable or TPS within 0% to
100%.
Was the problem solved?
—
Verify repair
Go to Step 24
24
Check the TPS harness for the following conditions.
• Check for poor connector connection.
• Check for misrouted harness.
• Check for any accessory parts which may cause
electric interference.
If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to Step 25
25
Substitute a known good TPS and recheck.
Was the problem solved?
—
Go to Step 26
Go to Step 31
26
Replace the TPS.
Is the action complete?
—
Verify repair
—
27
Remove the injection nozzles from the engine and
check for the following conditions.
• Improper splay condition.
• Operating pressure is incorrect.
If a problem is found, repair as necessary.
Was the problem found?
—
Replace the
injection nozzle
and verify repair
Go to Step 28
Step
Action
Value(s)
Yes
No
1
st
Stage
2
nd
Stage
20.0 - 21.0 Mpa
(204 - 214 kg/cm
2
)
34.3 - 35.8 Mpa
(350 - 365 kg/cm
2
)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст