Lexus SC300 / Lexus SC400. Service manual — part 611
AIR INDUCTION SYSTEM
Air Flow Meter
ON–VEHICLE INSPECTION
INSPECT RESISTANCE OF AIR FLOW METER
(a) Disconnect the air flow meter connector.
(b) Using an ohmmeter, measure the resistance between
terminals THA and E2.
Between
Resistance
Temperature
Between
terminals
Resistance
Tem erature
terminals
10–20 k
–20
°
C (–4
°
F)
4–7 k
9
°
C (32
°
F)
THA–E2
2–3 k
20
°
C (68
°
F)
0.9–1.3 k
40
°
C (104
°
F)
0.4–0.7 k
60
°
C (140
°
F)
If the resistance is not as specified, replace the air flow meter.
(c) Reconnect the air flow meter connector.
FI–63
– Air Induction System (Air Flow Meter)
EFI SYSTEM
COMPONENTS
REMOVAL OF AIR FLOW METER
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.
DISCONNECT AIR FLOW METER CONNECTOR
(a) Disconnect the air flow meter connector.
(b) Disconnect the wire clamp from the clamp bracket on
the air flow meter.
3.
REMOVE AIR CLEANER CASE AND AIR FLOW METER
ASSEMBLY
(a) Loosen the hose clamp.
(b) Remove the four mounting bolts.
(c) Disconnect the air cleaner hose from the air flow meter.
(d) Disconnect the air duct from the air cleaner case, and
remove the air cleaner case and air flow meter
assembly.
FI–64
EFI SYSTEM – Air Induction System (Air Flow Meter)
4.
REMOVE AIR FLOW METER FROM AIR CLEANER CASE
Remove the four bolts and air flow meter and gasket.
INSPECTION OF AIR FLOW METER
INSPECT AIR FLOW METER
Check that the honey–combed is neither deformed nor
damaged.
If necessary, replace the air flow meter.
INSTALLATION OF AIR FLOW METER
(See Components on page
)
1.
INSTALL AIR FLOW METER FROM AIR CLEANER CASE
Install a new gasket and the air flow meter with the four bolts.
Torque: 10 N
⋅
m (100 kgf
⋅
cm, 7 ft
⋅
lbf)
2. INSTALL AIR CLEANER CAP AND AIR FLOW METER
ASSEMBLY
(a) Connect the air cleaner case to the air duct.
(b) Connect the air flow meter to the air cleaner hose.
(c) Install the air cleaner and air flow meter assembly with
the four bolts.
(d) Tighten the hose clamp.
3.
CONNECT AIR FLOW METER CONNECTOR
(a) Connect the air flow meter connector.
(b) Install
the wire clamp to the clamp bracket on the air flow
meter.
4. CONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
FI–65
EFI SYSTEM – Air Induction System (Air Flow Meter)
Throttle Body
FI–66
– Air Induction System (Throttle Body)
EFI SYSTEM
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