Isuzu engine 4j series. Manual — part 95
6E – 4 EXHAUST GAS RECIRCULATION (EGR) SYSTEM
Exhaust Gas Recirculation (EGR) System Check
Step
Action
Value (s)
Yes
No
1
Check the EGR valve for looseness.
Is the EGR valve loose?
-
Go to Step 2
Go to Step 3
2
Tighten the EGR valve.
Is the action complete?
-
Verify repair
-
3
1. Engine "OFF."
2. Ignition "ON."
3. Using test light to ground, check the EGR harness
between the EGR valve and ignition feed.
Does the test light illuminate?
-
Go to Step 5
Go to Step 4
4
Repair the EGR harness ignition feed.
Was the problem corrected?
-
Verify repair
Go to Step 5
5
1. Remove the EGR valve.
2. Visually and physically inspect the EGR valve pintle,
valve passages and adapter for excessive deposits,
obstructions or any restrictions.
Does the EGR valve have excessive deposits,
obstructions or any restrictions?
-
Go to Step 6
Go to Step 7
6
Clean or replace EGR system components as necessary.
Was the problem corrected?
-
Verify repair
Go to Step 7
7
1. Remove the EGR inlet and outlet pipes from the intake
and exhaust manifolds.
2. Visually and physically inspect manifold EGR ports and
EGR inlet and outlet pipes for blockage or restriction
caused by excessive deposits or other damage.
Do the manifold EGR ports or inlet and outlet pipes have
excessive deposits, obstructions, or any restrictions?
-
Go to Step 8
EGR system
working
properly.
No problem
found.
8
Clean or replace EGR system components as necessary.
Is the action complete?
-
Verify repair
-
EXHAUST GAS RECIRCULATION (EGR) SYSTEM 6E– 5
INSPECTION
Vacuum Switch Valve (VSV)
Check the resistance between the VSV connector terminals
using a circuit tester.
Cold Resistance: 37 - 44 (
Ω
) (for 12 volt)
Connect battery voltage between VSV connector terminals and
make sure of the continuity between the ports.
EGR Valve
With negative pressure applied to the diaphragm chamber,
make sure that the valve is smoothly actuated to make the
area between (1) and (2) ventilated.
Startup: About -18.66
±
2.67 Kpa (-140
±
20 mmHg)
Check to see if EGR valve is normally actuated under the
following conditions:
QWS off (After warming up)
Engine coolant temp: 80°C or higher
ILLUSTRATION
TOOL NO.
TOOL NAME
5-8840-0366-0
High Impedance
Multimeter
(Digital Voltmeter-
DVM)
5-8840-0279-0
Vacuum Pump with
Gauge
056LW026.tif
056LW009.tif
6E-143-1.tif
6E-143-3.tif
6E – 6 EXHAUST GAS RECIRCULATION (EGR) SYSTEM
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ENGINE EXHAUST 6F – 1
SECTION 6F
ENGINE EXHAUST
CAUTION:
Exhaust system components must have enough
clearance from the underbody to prevent overheating
of the floor pan and possible damage to the passenger
compartment, insulation and trim materials.
CONTENTS
PAGE
General Description. . . . . . . . . . . . . . . . . . . . . . . . . . .
6F - 2
Three Way Catalytic Converter . . . . . . . . . . . . . . . . . . . . . ...
6F - 3
On-Vehicle Service . . . . . . . . . . . . . . . . . . . . . . . . . ..
6F - 4
Front Exhaust Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . ..
6F - 4
Exhaust Brake Unit. . . . . . . . . . . . . . . . . . . . . . . . . . ..
6F - 5
Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6F - 5
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