Lexus RX300 (MCU15). Service manual — part 217

A09045

ON

START

1

(+)

(–)

DI–100

–

DIAGNOSTICS

ENGINE

LEXUS RX300 (RM785E)

NG

Check and replace engine ECU (See page
IN–32).

OK

7

Check ignition coil with igniter power source circuit.

PREPARATION:
Disconnect the ignition coil the with the igniter connector.
CHECK:
Measure voltage between terminal 1 of the ignition coil with the
igniter connector and body ground when the ignition switch is
turned to ON and START position.
OK:

Voltage: 9 – 14 V

OK

Repair ignition coil with igniter power source
circuit.

NG

8

Check for open and short in harness and connector between ignition switch and
ignition coil with igniter (See page IN–32).

NG

Repair or replace harness or connector.

OK

Replace ignition coil with igniter.

–

DIAGNOSTICS

ENGINE

DI–101

LEXUS RX300 (RM785E)

DTC

P1335

Crankshaft Position Sensor Circuit Malfunc-
tion (During engine running)

CIRCUIT DESCRIPTION

Refer to DTC P0335 on page DI–67.

DTC No.

DTC Detecting Condition

Trouble Area

P1335

No crankshaft position sensor signal to engine ECU with en-

gine speed 1,000 rpm or more

S Open or short in crankshaft position sensor circuit

S Crankshaft position sensor

S Crankshaft timing pulley

S Engine ECU

WIRING DIAGRAM

Refer to DTC P0335 on page DI–67.

INSPECTION PROCEDURE

HINT:
Refer to DTC P0335 on page DI–67.

DI64E–04

DI–102

–

DIAGNOSTICS

ENGINE

LEXUS RX300 (RM785E)

DTC

P1346

VVT Sensor/Camshaft Position Sensor Cir-
cuit Range/Performance Problem (Bank 1)

DTC

P1351

VVT Sensor/Camshaft Position Sensor Cir-
cuit Range/Performance Problem (Bank 2)

CIRCUIT DESCRIPTION

VVT sensor (G(VV) signal) consist of a signal plate and pickup coil.
The G(VV) signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The actual camshaft angle is detected by the VVT sensor and it provides feedback to the engine ECU to
control the intake valve timing in response to during condition.

DTC No.

Detection Item

Trouble Area

P1346

Deviation in crankshaft position sensor signal and VVT sensor

(Bank 1) signal (2 trip detection logic)

S Mechanical system malfunction (Skipping teeth of timing belt,

b lt t t h d)

P1351

Deviation in crankshaft position sensor signal and VVT sensor

(Bank 2) signal (2 trip detection logic)

belt stretched)

S Engine ECU

WIRING DIAGRAM

Refer to DTC P0335 on page DI–67.

INSPECTION PROCEDURE

HINT:
Read freeze frame data using hand–held tester. Because freeze frame records the engine conditions when
the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was run-
ning or stopped, the engine warmed up or not, the air–fuel ratio lean or rich, etc. at the time of the malfunction.

1

Check valve timing (Check for loose and jumping teeth of timing belt)
(See page EM–22).

NG

Adjust valve timing (Repair or replace
timing belt).

OK

Check and replace engine ECU (See page
IN–32).

DI1MB–11

A07621

A09776

Right Bank OCV

1

2

Y–B

G–W

Engine ECU

OC1+

OC1–

OC2+

OC2–

29

18

Left Bank OCV

G–Y

G–R

1

2

6

5

E8

E8

E8

E8

–

DIAGNOSTICS

ENGINE

DI–103

LEXUS RX300 (RM785E)

DTC

P1349

VVT System Malfunction (Bank 1)

DTC

P1354

VVT System Malfunction (Bank 2)

CIRCUIT DESCRIPTION

VVT system controls the intake valve timing to proper timing in response to driving condition.
Engine ECU controls OCV (Oil Control Valve) to make the intake valve timing properly, and, oil pressure con-
trolled with OCV is supplied to the VVT controller, and then, VVT controller changes relative position between
the camshaft and the crankshaft.

DTC No.

DTC Detecting Condition

Trouble Area

P1349

P1354

Condition (a) or (b) continues for after the engine is

warmed up and engine speed at 400 – 4,000 rpm:

(a) Valve timing does not change from of current valve timing

(b) Current valve timing is fixed

S Valve timing

S Oil control valve

S VVT controller assembly

S Engine ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
Read freeze frame data using hand–held tester. Because freeze frame records the engine conditions when
the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was run-
ning or stopped, the engine warmed up or not, the air–fuel ratio lean or rich, etc. at the time of the malfunction.

DI7I6–04