Lexus SC300 / Lexus SC400. Service manual — part 476
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EFI Main Relay
INSPECTION OF EFI MAIN RELAY
1. REMOVE
EFI MAIN RELAY FROM RELAY BOX IN ENGINE
COMPARTMENT
2.
INSPECT EFI MAIN RELAY
A. Inspect relay continuity
(a) Using an ohmmeter, check that there is continuity
between terminals 1 and 3.
(b) Check that there is no continuity between terminals 2
and 4.
If continuity is not as specified, replace the relay.
B. Inspect relay operation
(a) Apply battery voltage across terminals 1 and 3.
(b) Using an ohmmeter, check that there is continuity
between terminals 2 and 4.
If operation is not as specified, replace the relay.
3.
REINSTALL EFI MAIN RELAY
FI–64
–
EFI SYSTEM
Electronic Control System (EFI main RelaY)
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VSV for EVAP
INSPECTION OF VSV FOR EVAP
(See Emission Control System on page
VSV for EGR
INSPECTION OF VSV FOR EGR
(See Emission Control Systems on page
VSV for ACIS
INSPECTION OF VSV FOR ACIS
(See page
–
EFI SYSTEM
Electronic Control System (VSV for EVAP)
(VSV for EGR) (VSV for ACIS)
FI–65
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Throttle Body
FI–66
– Air Induction System (Throttle Body)
EFI SYSTEM
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ON–VEHICLE INSPECTION
1.
INSPECT THROTTLE BODY
(a) Remove the throttle body cover.
•
Remove the mounting cap nut.
•
Loosen the two bolts, and remove the throttle body
cover.
(b) Check that the throttle linkage moves smoothly.
(c) Check the vacuum at each port.
•
Start the engine.
•
Check the vacuum with your finger.
Port name
At idling
At 3,000 rpm
P
No vacuum
Vacuum
*E
No vacuum
Vacuum
*R
No vacuum
Vacuum
* Exc. USA Spec.
(d) Reinstall the throttle body cover.
3.
INSPECT AND ADJUST DASH POT (DP)
A. Warm up engine
Allow the engine to warm up to normal operating tempera-
ture.
B. Check idle speed
Idle speed: 700
±
50 rpm
C. Remove cap, filter and separator from DP
FI–67
EFI SYSTEM – Air Induction System (Throttle Body)
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