Lexus RX300 (MCU15). Service manual — part 219
DI–108
–
DIAGNOSTICS
ENGINE
LEXUS RX300 (RM785E)
6
Check blockage of oil control valve, oil check valve and oil pipe No. 1.
NG
Repair or replace.
OK
7
Check whether or not DTC P1349 is stored.
PREPARATION:
(a)
Clear the DTC (See page DI–3).
(b)
Perform simulation test.
CHECK:
Check whether or not DTC P1349 is stored (See page DI–3).
OK:
DTC P1349 is not stored
OK
VVT system is OK.*
*: DTCs P1349 are also output after the foreign object is caught
in some part of the system in the engine oil and the system re-
turns to normal in a short time. As engine ECU controls so that
foreign objects are ejected, there is no problem about VVT.
There is also no problem since the oil filter should get the for-
eign object in the engine oil.
NG
Replace engine ECU.
A11663
VV1, VV2 and NE Signal Waveforms
2 V
/Division
20 msec./Division (Idling)
VV1
NE
VV2
GND
GND
GND
–
DIAGNOSTICS
ENGINE
DI–109
LEXUS RX300 (RM785E)
DTC
P1350
VVT Sensor/Camshaft Position Sensor Cir-
cuit Malfunction (Bank 2)
CIRCUIT DESCRIPTION
Refer to DTC P1346, P1351 on page DI–102.
DTC No.
DTC Detecting Condition
Trouble Area
No VVT sensor (Camshaft position sensor) signal to engine
ECU during cranking at 4 sec. or more
S Open or short in VVT sensor (camshaft position sensor) cir-
P1345
P1350
No VVT sensor (Camshaft position sensor) signal to engine
ECU with 5 sec. or more engine speed 600 rpm or more
cuit
S VVT sensor (camshaft position sensor)
S Camshaft timing gear
While crankshaft rotates twice, VVT sensor (Camshaft position
sensor) signal will be input to engine ECU 5 times.
S Camshaft timing gear
S Engine ECU
WIRING DIAGRAM
Refer to DTC P0335 on page DI–67.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand–held tester or OBD scan tool. Because freeze frame records the engine
conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the
vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc.
at the time of the malfunction.
1
Check resistance of VVT sensor (See page IG–1).
Reference: INSPECTION USING OSCILLOSCOPE
During idling, check the waveforms between terminals VV1 and
NE+, and VV2 and NE– of the engine ECU connector.
HINT:
S
The correct waveforms are as shown.
S
The waveform frequency is shortened as the engine
speed becomes higher.
NG
Replace VVT sensor.
OK
DI84G–02
DI–110
–
DIAGNOSTICS
ENGINE
LEXUS RX300 (RM785E)
2
Check for open and short in harness and connector between engine ECU and
VVT sensor (See page IN–32).
NG
Repair or replace harness or connector.
OK
3
Inspect sensor installation and signal plate teeth of camshaft timing gear.
NG
Tighten sensor. Replace camshaft timing gear.
OK
Check and replace engine ECU
(See page IN–32).
A14519
FL Block
Battery
S10
Stop Light
Switch
ALT
F11
STOP
2
1
5E
5
L2
Light Failure Sensor
7
2
To Stop Light
E9
22
STP
11
W
1
5B
5B
4
9
1E
1
1A
G–W
G–O
J/B No. 5
G–B
IA1
G–W
G–W
G–R
W
5
3
Instrument Panel J/B
ST+
ST–
Engine ECU
–
DIAGNOSTICS
ENGINE
DI–111
LEXUS RX300 (RM785E)
DTC
P1520
Stop Light Switch Signal Malfunction
CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights.
The STP signal is used mainly to control the fuel cut–off engine speed (The fuel cut–off engine speed is re-
duced slightly when the vehicle is braking.).
DTC No.
DTC Detecting Condition
Trouble Area
P1520
Stop light switch does not turn off when repeating driving at 30
km or more 10 time or more after depressing brake (2 trip
detection logic)
S Short in stop light switch signal circuit
S Stop light switch
S Engine ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand–held tester or OBD scan tool. Because freeze frame records the engine
conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the
vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc.
at the time of the malfunction.
1
Check operation of stop light.
CHECK:
Check if the stop lights go on and off normally when the brake pedal is operated and released.
NG
Check and repair stop light circuit.
DI088–12
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст