Engine Control System (4HK1) 1A-171
4
1.
Inspect the following conditions:
• An EGR valve gasket that is missing or
damaged
• A sticking EGR valve
• EGR gas leakage from any of the EGR
passages between the exhaust manifold
and intake manifold
• Restricted or collapsed EGR passage
between the exhaust manifold and the
EGR valve
• Any type of restriction in the exhaust
system
• Restricted air cleaner element, restricted
or collapsed air tubing between the air
cleaner and the intake manifold
• Any air induction leak
• Any water intrusion in the induction
system
• Any contamination or objects that block
the MAF sensor inlet
• Skew or slow MAF sensor
• Exhaust throttle valve or exhaust brake
valve for stuck condition. Refer to
Exhaust System in Section 1G Engine
Exhaust.
• A ventilation duct that is connected to the
exhaust tail pipe. Retest without the duct
if connected.
2.
Repair or replace as necessary.
Did you find and correct the condition?
—
Go to Step 7
Go to Step 5
5
1.
Perform the EGR Solenoid Control with a scan
tool several times.
2.
Command the Desired EGR Position Increase
and Decrease while observing the EGR
Position 1.
Does the EGR Position 1 parameter follow
within the specified value quick enough
(compare with a similar unit if available)?
±
5%
Go to Diagnostic
Aids
Go to Step 6
6
Replace the EGR valve. Refer to EGR Valve and
EGR Cooler in Section 1F Emission Control.
Did you complete the replacement?
—
Go to Step 7
7
1.
Reconnect all previously disconnected
harness connector(s).
2.
Clear the DTCs with a scan tool.
Notice:
A history DTC will not clear.
3.
Turn OFF the ignition for 30 seconds.
4.
Start the engine and warm up (allow engine
coolant temperature to reach at least 75
°
C
[167
°
F])
5.
Let idle for at least 3 minutes while observing
the DTC Information with a scan tool.
Did the DTC fail this ignition?
—
Go to Step 2
Go to Step 8
Step
Action
Value(s)
Yes
No
LG4HKED-WE-0871.book 171
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２００７年１１月２９日 木曜日 午後６時２９分
