Lexus RX300 (MCU15). Manual — part 425

FI0W5–01

–

ELECTRONIC FUEL INJECTION

ENGINE ECU

FI–71

LEXUS RX300 (RM785E)

INSPECTION

1.

REMOVE ENGINE ECU

2.

INSPECT ENGINE ECU (See page DI–19)

3.

REINSTALL ENGINE ECU

A05071

FI0W6–01

D09456

Hand–Held Tester

DLC3

B04808

Sound Scope

FI–72

–

ELECTRONIC FUEL INJECTION

FUEL CUT RPM

LEXUS RX300 (RM785E)

FUEL CUT RPM

INSPECTION

1.

REMOVE V–BANK COVER

(a)

Using a 5 mm hexagon wrench, remove the 2 cap nuts.

(b)

Disconnect the 2 clips, and remove the V–bank cover.

2.

WARM UP ENGINE

Allow the engine to warm up to normal operating temperature.

3.

CONNECT HAND–HELD TESTER OR OBDII SCAN
TOOL

(a)

Connect the hand–held tester or OBDII scan tool to the
DLC3.

(b)

Please refer to the hand–held tester or OBDII scan tool
operator’s manual for further details.

4.

INSPECT FUEL CUT OFF PRM

(a)

Increase the engine speed to at least 3,500 rpm.

(b)

Use a sound scope to check for injector operating noise.

(c)

Check that when the throttle lever is released, injector op-
eration noise stops momentarily and then resumes.

HINT:
Measure with the A/C OFF.

Fuel return rpm: 1,200 rpm

5.

DISCONNECT HAND–HELD TESTER OR
OBDII SCAN TOOL

6.

REINSTALL V–BANK COVER

HINT:
For fixing the V–bank cover, push on the cover until a ”click” is
felt.

EMISSION CONTROL

EMISSION CONTROL SYSTEM

EC–1

. . . . . . . . . . .

PARTS LAYOUT AND SCHEMATIC

DRAWING

EC–2

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

POSITIVE CRANKCASE VENTILATION (PCV)

SYSTEM

EC–4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EVAPORATIVE EMISSION (EVAP) CONTROL

SYSTEM

EC–5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WARM UP THREE–WAY CATALYTIC

CONVERTER (WU–TWC) SYSTEM

EC–7

. . . . . .

THREE–WAY CATALYTIC CONVERTER

(TWC) SYSTEM

EC–10

. . . . . . . . . . . . . . . . . . . . . . .