1A-300 Engine Control System (4JJ1)
3
1. Inspect the following conditions:
• An EGR valve gasket that is missing or
damaged
• A sticking EGR valve
• EGR gas leakage any of the EGR
passage 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
• Skewed or slow MAF sensor
• Skewed engine coolant temperature
(ECT) sensor. Refer to Temperature vs
Resistance table to test the ECT sensor
at various temperature levels to evaluate
the possibility of a skewed sensor.
• Skewed barometric pressure (BARO)
sensor. Determine the outside barometric
pressure from you location specified in
the altitude vs barometric pressure table.
Refer to Altitude vs Barometric Pressure.
• A sticking intake throttle valve
2. Repair the condition as necessary.
Did you find and correct the condition?
—
Go to Step 13 Go to Step 4
4
1. Place the transmission in Neutral and set the
parking brake.
2. Start the engine and warm up (arrow engine
coolant temperature to reach at least 75°C
[167°F]).
3. Accelerate the engine between idle and
W.O.T (accelerator pedal full travel) many
times while observing the Desired EGR
Position and EGR Position parameter with a
scan tool.
Does the EGR Position parameter follow within the
specified value?
± 5%
Go to Step 5 Go to Step 7
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.
Does the EGR Position parameter follow within the
specified value quick enough?
± 5%
Go to Step 6 Go to Step 7
Step Action Value(s) Yes No
LG4JJED-WE-0871.book 300 ページ ２００８年４月４日 金曜日 午前９時６分
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