Lexus ES300 (1997 year). Manual — part 331
A00233
OFF
EVP1
ON
ON
VSV is ON
VSV is OFF
BE6653
S01097
P24973
P24974
Air
F
Air
F
E
E
–
DIAGNOSTICS
ENGINE
DI–101
253
1997 LEXUS ES300 (RM511U)
5
Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page
NG
Repair or replace harness or connector.
OK
Replace vapor pressure sensor.
6
Check VSV for EVAP.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Turn ignition switch ON.
CHECK:
Check VSV function.
(1)
Connect between terminal EVP1 of ECM and body
ground.
(2)
Disconnect between terminal EVP1 of ECM and
body ground.
OK:
(1) VSV is ON:
Air from pipe E is flowing out through pipe F.
(2) VSV is OFF:
Air does not flow from pipe E to pipe F.
OK
Go to step 9.
NG
7
Check operation of VSV for EVAP (See page
NG
Replace VSV for EVAP.
OK
A00234
ON
ON
TPC
OFF
VSV is OFF
VSV is ON
Air
Air
F
F
E
E
G
G
DI–102
–
DIAGNOSTICS
ENGINE
254
1997 LEXUS ES300 (RM511U)
8
Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for EVAP and ECM (See page
NG
Repair or replace harness or connector.
OK
Check and replace ECM (See page
).
9
Check VSV for vapor pressure sensor.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Turn ignition switch ON.
CHECK:
Check VSV function.
(1)
Connect between terminal TPC of ECM and body
ground (ON).
(2)
Disconnect between terminal TPC of ECM and
body ground (OFF).
OK:
(1) VSV is ON:
Air from pipe E is flowing out through pipe F.
(2) VSV is OFF:
Air from pipe E flows out through pipe G.
OK
Check and replace charcoal canister
(See page
).
NG
–
DIAGNOSTICS
ENGINE
DI–103
255
1997 LEXUS ES300 (RM511U)
10
Check operation of VSV for vapor pressure sensor (See page
NG
Replace VSV for vapor pressure sensor.
OK
11
Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for vapor pressure sensor and ECM (See page
NG
Repair or replace harness or connector.
OK
Check and replace ECM (See page
).
S00042
Charcoal Canister
Vapor Pressure
Sensor
VSV for Vapor
Fuel Tank
VSV
for EVAP
Pressure Sensor
ECM
DI–104
–
DIAGNOSTICS
ENGINE
256
1997 LEXUS ES300 (RM511U)
DTC
P0450
Evaporative Emission Control System
Pressure Sensor Malfunction
CIRCUIT DESCRIPTION
The vapor pressure sensor and VSV for vapor pressure sensor are used to detect abnormalities in the evap-
orative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTC P0450 is recorded by the ECM when the vapor pressure sensor malfunction.
DTC No.
DTC Detecting Condition
Trouble Area
P0450
10 seconds or more after engine starting condition (a) or (b)
continues for 7 seconds or more:
(2 trip detection logic)
(a) Vapor Pressure Sensor Value
–3.5 kPa (–26 mmHg,
–1.0 in.Hg)
(b) Vapor Pressure Sensor Value
1.5 kPa (11 mmHg,
0.4 in.Hg)
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
ECM
WIRING DIAGRAM
Refer to DTC P0440 on page
DI09X–01
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст