Page 1337 of 6020
6F – 4 EXHAUST SYSTEM
REMOVAL AND INSTALLATION
RTW 46FLF000101
Removal Steps
1. Rear hanger rubber
2. Silencer front nut
3. Exhaust silencer
4. Silencer hanger rubber
5. Middle pipe nut
6. Front hanger rubber
7. Front pipe nut
8. Exhaust pipe gasket
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Page 1338 of 6020
EXHAUST SYSTEM 6F – 5
Important Operations – Installation
Follow the removal procedure in the reverse order to
perform the installation procedure. Pay careful attention to
the important points during the installation procedure.
1. Front Pipe Nut Connect the exhaust pipe to the catalytic converter.
Torque N ⋅m (kg ⋅m/lb ⋅ft)
67 (6.8/49)
2. Middle pipe Nut (4 ×
××
×
4 only)
Connect the middle pipe to the front pipe.
Torque N ⋅m (kg ⋅m/lb ⋅ft)
43 (4.4/32)
3. Silencer Front Nut Connect the silencer to the front or middle pipe.
Torque N ⋅m (kg ⋅m/lb ⋅ft)
43 (4.4/32)
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Page 1339 of 6020
6F – 6 EXHAUST SYSTEM
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered during
inspection.
Front Exhaust Pipe
Exhaust Silencer
Check the pipes for corrosion, cracking, damage or
misalignment and repair as required.
Check the rubber rings for deterioration or damage and repair
as required.
Catalytic Converter
1. Inspect outside the catalytic converter for any hitting mark.
2. Visual check inside the catalytic converter for crack or break converter element.
3. If find any problem during the inspection, replace the catalytic converter assembly.
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ISUZU KB P190 2007
Page 1340 of 6020
EXHAUST SYSTEM 6F – 7
GENERAL DESCRIPTION
This system controls the formation of NOx emission by recirculating the exhaust gas into the combustion chamber
through the intake manifold.
4JA1T(L):
The two EGR valves are controlled by two Vacuum Switching Valve (VSV) controlled by EGR controller according to
signals from various sensors.
The amount of EGR depends on the number of engine rotations and the opening of the accelerator.
RTW 46ELF001201
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Page 1341 of 6020
6F – 8 EXHAUST SYSTEM
4JA1TC/4JH1TC
The EGR system engine is controlled by ECM. Refer to “Engine driveability and emissions” section for detail.
RTW 46ELF001101
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Page 1342 of 6020
EXHAUST SYSTEM 6F – 9
EGR SYSTEM DIAGRAM 4JA1T (L)
RTW 46AMF000301
EGR System Operation
Inspect EGR valve motion visually while changing engine RPM under no load condition after warming-up.
• Inspection point (Engine RPM)
RPM Idling 900 ∼ 960 2000 3250
Engine Front Side VSV-1
ON ON ON OFF
Engine Rear Side VSV-2 ON OFF ON OFF
ON means VSV should receive signal to move EGR valve.
OFF means VSV shouldn’t receive signal to move EGR valve.
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ISUZU KB P190 2007
Page 1343 of 6020
6F – 10 EXHAUST SYSTEM
4JA1TC/4JH1TC
The EGR system engine is controlled by ECM. Refer to “Engine driveability and emissions” section for detail.
RTW 46EMF000701
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Page 1344 of 6020
EXHAUST SYSTEM 6F – 11
INSPECTION
4JA1T(L)
Vacuum switch valve (VSV)
Use a circuit tester to measure the V.S.V. resistance.
V.S.V Resistance Ω at 20°C
37 ~ 44
If the resistance is not within specification, replace it.
EGR Valve
Apply vacuum to the EGR valve, check to see the valve
operation.
Negative Pressure
4JA1TC/4JH1TC
RTW 46ESH000301
EVRV
Use a circuit tester to measure the EVRV resistance.
EVRV Resistance Ω at 20°C
14
If the resistance is not within specification, replace it.
EGR Valve
Apply vacuum to the EGR valve, check to see the valve
operation.
Negative Pressure 4JH1TC
Less than 250 mmHg Not operation
More than 300 mmHg Operation
Negative Pressure 4JA1TC
Less than 100 mmHg Not operation
More than 170 mmHg Operation
Less then 180 mmHg Not operation
More than 240 mmHg
Operation
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ISUZU KB P190 2007