Lexus SC300 / Lexus SC400. Manual — part 340
INSPECTION OF EGR SYSTEM (USA
Spec.)
INSPECT SYSTEM OPERATION
(a) Using SST, connect terminals TE1 and E1 of the check
(”DIAGNOSIS”) connector.
SST 09843–18020
(b) Keep the engine at 3,500 rpm.
(c) Set the transmission shift lever to the ”N” position.
(d) Remove the SST from the check connector.
SST 09843–18020
(e) Check whether the engine rpm increases 100–300 rpm
under the following conditions.
Coolant temp.
Below 53
°
C (127
°
F) No increase
Above 55
°
C (131
°
F) Increases
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
EC–17
INSPECTION OF EGR SYSTEM
(Exc. USA Spec.)
1. CHECK
AND
CLEAN
FILTERS
IN
EGR
VACUUM
MODULATOR
(a) Remove the cap and filter.
(b) Check the filter for contamination or damage.
(c) Using compressed air, clean the filters.
(d) Reinstall the filter and cap.
HINT: Install the filter with the coarser surface facing the at-
mospheric side (outward).
2.
INSPECT SYSTEM OPERATION
(a) Using SST, connect terminals TE1 and E1 of the check
(”DIAGNOSIS”) connector.
SST 09843–18020
(b) Keep the engine at 3,500 rpm.
(c) Set the transmission shift lever to the ”N” position.
(d) Remove the SST from the check connector.
SST 09843–18020
(e) Check whether the engine rpm increases 100–300 rpm
under the following conditions:
Coolant temp.
Below 53
°
C (127
°
F) No increase
Above 55
°
C (131
°
F) Increases
EC–18
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
INSPECTION OF VSV (Exc. USA Spec.)
1.
DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ”LOCK” position and the negative (–) termi-
nal cable is disconnected from the battery.
2. REMOVE
VSV
(a) Disconnect the VSV connector.
(b) Disconnect the following hoses:
(1) Vacuum hose (from EGR valve) from VSV
(2) Vacuum hose (from EGR vacuum modulator) from
VSV
(c) Remove the bolt and VSV.
3. INSPECT
VSV
A. Inspect VSV for open circuit
Using an ohmmeter, check that there is continuity between
the terminals.
Resistance (Cold): 33–39
If there is no continuity, replace the VSV.
B. Inspect VSV for ground
Using an ohmmeter, check that there is no continuity be-
tween each terminal and the body.
If there is continuity, replace the VSV.
C. Inspect VSV operation
(a) Check that the air flows from ports E to G.
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
EC–19
(b) Apply battery voltage across the terminals.
(c) Check that the air flows from port E to the filter.
If operation is not as specified, replace the VSV.
4. REINSTALL
VSV
(a) Install the VSV with the bolt.
Torque: 18 N
⋅
m (185 kgf
⋅
cm, 13 ft
⋅
lbf)
(b) Connect the following hoses:
(1) Vacuum hose (from EGR valve) to VSV
(2) Vacuum hose (from EGR vacuum modulator) to
VSV
(c) Connect the VSV connector.
5. RECONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY
INSPECTION OF EGR VACUUM
MODULATOR (Exc. USA Spec.)
1. DISCONNECT VACUUM HOSES FROM EGR VACUUM
MODULATOR
Disconnect the three vacuum hoses from ports P, Q and R of
the EGR vacuum modulator.
2.
INSPECT EGR VACUUM MODULATOR OPERATION
(a) Block ports P and R with your finger.
(b) Blow air into port Q, and check that the air passes
through to the air filter side freely.
(c) Start the engine, and maintain speed at 2,500 rpm.
(d) Repeat the above test. Check that there is a strong
resistance to air flow.
3. RECONNECT
VACUUM
HOSES
TO
EGR
VACUUM
MODULATOR
Connect the three vacuum hoses to the proper locations.
EC–20
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
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