Lexus SC300 / Lexus SC400. Manual - part 519

PRECAUTIONS

1. 

Always use new gaskets when replacing the fuel tank or
component part.

2. 

Apply the proper torque to all parts tightened.

INSPECTION OF FUEL LINES AND
CONNECTIONS

(a)  Inspect the fuel lines and connections for cracks,

leakage or deformation.

(b)  Inspect the fuel tank vapor vent system hoses and

connections for looseness, kinks or damage.

(c)  Inspect the fuel tank for deformation, cracks, fuel

leakage or tank band looseness.

(d)  Check the filter neck for damage or fuel leakage.

(e) Hose and tube connections are as shown in the

illustration.

If a problem is found, repair or replace the parts as necessary.

FI–38

–

EFI SYSTEM

REPAIR INSTRUCTIONS

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

terminals

Resistance

Temperature

10–20 k

–20

°

C (–4

°

F)

4–7 k

9

°

C (32

°

F)

THA–E2

2–3 k

20

°

C (68

°

F)

THA E2

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.

–

EFI SYSTEM

Air Induction System (Air Flow Meter)

FI–39

COMPONENTS

REMOVAL OF AIR FLOW METER

1. 

DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION: Turn the ignition switch to ”LOCK”. Discon-
nect the cable from the negative (–) terminal of the bat-
tery. Wait at least 20 seconds before proceeding with
work.

2. 

REMOVE AIR CLEANER HOSE
(a)  Disconnect the following hoses:

(1) PS air hose from No. 4 timing belt cover
(2) PCV hose from No. 2 cylinder head cover

(b) Loosen 

the two hose clamps and remove the air cleaner

hose.

FI–40

–

EFI SYSTEM

Air Induction System (Air Flow Meter)

3. 

REMOVE AIR FLOW METER FROM AIR CLEANER CASE
(a)  Disconnect the air flow meter connector.
(b)  Remove the four nuts, bolt, air flow meter and gasket.

INSPECTION OF AIR FLOW METER

INSPECT AIR FLOW METER

Check that the honey–combed is neither deformed nor dam-
aged.
If necessary, replace the air flow meter.

INSTALLATION OF AIR FLOW METER

(See Components on page 

FI–40

)

1. 

INSTALL AIR FLOW METER FROM AIR CLEANER CASE
(a)  Install a new gasket and the air flow meter with the four

nuts and a bolt.

Torque:     10 N

⋅

m (100 kgf

⋅

cm, 7 ft

⋅

lbf)

(b)  Connect the air flow meter connector.

2. 

INSTALL AIR CLEANER HOSE
(a)  Install the air cleaner hose with two hose clamps.
(b)  Connect the following hoses:

(1) PS air hose to No. 4 timing belt cover
(2) PCV hose to No. 2 cylinder head cover

3.  CONNECT CABLE FROM NEGATIVE TERMINAL OF

BATTERY

–

EFI SYSTEM

Air Induction System (Air Flow Meter)

FI–41