Lexus RX300 (MCU15). Service manual - part 418

FI0VG–01

–

ELECTRONIC FUEL INJECTION

CAMSHAFT TIMING OIL CONTROL VALVE

FI–43

LEXUS RX300   (RM785E)

INSTALLATION

Installation is in the reverse order of removal (See page FI–41).

FI0VH–01

A05186

DLC1

E1

TE1

DLC1

SST

B04811

RSC

+B

RSO

Ohmmeter

FI–44

–

ELECTRONIC FUEL INJECTION

IDLE SPEED CONTROL (ISC) VALVE

LEXUS RX300   (RM785E)

IDLE SPEED CONTROL (ISC)
VALVE

ON–VEHICLE INSPECTION

1.

INSPECT ISC VALVE OPERATION

(a)

Initial conditions:

S

Engine at normal operating temperature

S

Idle speed checked correctly

S

Transmission in neutral position

S

A/C switch OFF

(b)

Using SST, connect terminals TE1 and E1 of the DLC1.
SST

09843–18020

(c)

After engine speed is kept at approx. 1,000 rpm for 5 se-
conds, check that it returns to idle speed.

If the engine speed operation is not as specified, check the ISC
valve, wiring and engine ECU.
(d)

Remove the SST from the DLC1.
SST

09843–18020

2.

INSPECT ISC VALVE RESISTANCE

NOTICE:
”Cold” and ”Hot” in the following sentences express the
temperature of the coils themselves. ”Cold” is from –10

°C

(14

°F) to 50°C (122°F) and ”Hot” is from 50°C (122°F) to

100

°C (212°F).

(a)

Disconnect the ISC valve connector.

(b)

Using an ohmmeter, measure the resistance between ter-
minal +B and other terminals (RSC, RSO).
Resistance:
Cold: 17.0 – 24.5 Ω
Hot:   21.5 – 28.5 Ω

If resistance is not as specified, replace the ISC valve.
(c)

Reconnect the ISC valve connector.

3.

INSPECT AIR ASSIST SYSTEM

(a)

Initial conditions:

S

Engine at normal operating temperature

S

Idle speed checked correctly

S

Transmission in neutral position

S

A/C switch OFF

A05186

E1

DLC1

TE1

SST

–

ELECTRONIC FUEL INJECTION

IDLE SPEED CONTROL (ISC) VALVE

FI–45

LEXUS RX300   (RM785E)

(b)

Using SST, connect terminals TE1 and E1 of the DLC1.
SST

09843–18020

(c)

After engine speed is kept at 900 – 1,300 rpm for 10 se-
conds, check that it returns to idle speed.

(d)

Stop the engine.

(e)

Disconnect the air assist hose from the air pipe, and block
off the ISC valve exit and the entry to the pipe.

(f)

Start the engine and check that the idle speed reaches
500 rpm or below (the engine may stall).
If the idle does not reach 500 rpm or below, check for a
leak between the air assist hoses, pipe and injectors.

(g)

Remove the SST from the DLC1.
SST

09843–18020

(h)

Reconnect the air assist hose to the ISC valve.

FI0VI–01

B12953

B05283

z

 Gasket

Throttle Body

Water Bypass Hose

Air Hose

N·m (kgf·cm, ft·lbf)

z

 Non–reusable part

19.5 (199, 14)

: Specified torque

Air Cleaner Case

Air Cleaner Cap

Air Cleaner Hose

Vacuum Hose

Accelerater Cable

Connector

Surge Tank Stay

Connector

ISC Valve

z

 Gasket

Throttle Body

19.5 (199, 14)

FI–46

–

ELECTRONIC FUEL INJECTION

IDLE SPEED CONTROL (ISC) VALVE

LEXUS RX300   (RM785E)

COMPONENTS