Lexus SC300 / Lexus SC400. Manual — part 717
OPERATION (Cont’d)
EC–16
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
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
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