Lexus ES300 (1997 year). Manual — part 317
S05724
EFI
Relay
EFI
2A
2K
Junction
Connector
B–Y
B–Y
J28
J29
B
B
IK3
9
2F
2J
FL
MAIN
Battery
F8
F6
1
1
Fusible
Link
Block
J28
B
From Ignition Switch
EC
B–G
W–B
B
7
2
4
1
2
5
1
3
J23
Junction
Connector
B–Y
B–Y
A
A
B–Y
Heated Oxygen Sensor
B–Y
Heated Oxygen
(Bank 2 Sensor 1)
(Bank 1 Sensor 1)
Sensor
Heated Oxygen Sensor
(Bank 1 Sensor 2)
2
3
1
4
2
3
1
4
IK1
L–B
P–B
Y–R
W
B
2
2
3
1
4
BR
BR
BR
BR
BR
BR
BR
EE
EE
B
E9
E8
E9
E10
E8
E7
E7
19
10
13
28
11
18
17
ECM
OXL1
HTL1
OXR1
E03
E1
E03
E03
E03
E1
HTR
OXS
HTS
E1
Engine
Room
J/B
DI–44
–
DIAGNOSTICS
ENGINE
196
1997 LEXUS ES300 (RM511U)
HINT:
After confirming DTC P0125 use the OBD II scan tool or LEXUS hand−held tester to confirm voltage
output of heated oxygen sensor (bank 1, 2 sensor 1) from CURRENT DATA.
If voltage output of heated oxygen sensor (bank 1, 2 sensor 1) is 0 V, heated oxygen sensor (bank 1, 2 sensor
1) circuit may be open or short.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Connect OBD II scan tool or LEXUS hand–held tester and read value for
voltage output of heated oxygen sensor (bank 1, 2 sensor 1).
PREPARATION:
(a)
Connect the OBD II scan tool or LEXUS hand–held tester to the DLC3.
(b)
Warm up engine to normal operating temp.
CHECK:
Read voltage output of heated oxygen sensor (bank 1 sensor 1) when engine is suddenly raced.
HINT:Perform quick racing to 4,000 rpm 3 times using accelerator pedal.
OK:
Both heated oxygen sensors
[
(bank 1 sensor 1) (bank 2 sensor 1)
]
output a RICH signal
(0.45 V or more) at least once.
OK
Check and replace ECM (See page
).
NG
–
DIAGNOSTICS
ENGINE
DI–45
197
1997 LEXUS ES300 (RM511U)
2
Check for open and short in harness and connector between ECM and heated
oxygen sensor (bank 1, 2 sensor 1) (See page
NG
Repair or replace harness or connector.
OK
Replace heated oxygen sensor
(bank 1, 2 sensor 1).
FI7130
Vehicle speed
50
∼
65 km/h
(31
∼
40 mph)
Idling
IG SW OFF
1
∼
3 min.
1 min.
Time
(1)(2)
(3)
(4)
(5)
DI–46
–
DIAGNOSTICS
ENGINE
198
1997 LEXUS ES300 (RM511U)
DTC
P0130
Heated Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 1)
DTC
P0150
Heated Oxygen Sensor Circuit Malfunction
(Bank 2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page
DTC No.
DTC Detecting Condition
Trouble Area
P0130
P0150
Voltage output of heated oxygen sensor remains at 0.4 V or
more, or 0.55 V or less, during idling after the engine is
warmed up (2 trip detection logic)
Heated oxygen sensor
Fuel trim malfunction
HINT:
Bank 1 refers to the bank that includes cylinder No.1. Bank 2 refers to the bank that does not include
cylinder No.1. Sensor 1 refers to the sensor closer to the engine body.
The heated oxygen sensor’s output voltage and the short−term fuel trim value can be read using the
OBD II scan tool or LEXUS hand−held tester.
WIRING DIAGRAM
Refer to DTC P0125 on page
CONFIRMATION DRIVING PATTERN
(1) Connect the LEXUS hand–held tester to the DLC3.
(2) Switch the LEXUS hand–held tester from normal mode to check mode (See page
(3) Start the engine and warm it up with all accessory switches OFF.
(4) Drive the vehicle at 50
∼
65 km/h (31
∼
40 mph) for 1
∼
3 min. to warm up the heated oxygen sensor.
(5) Let the engine idle for 1 min.
HINT:If a malfunction exists, the MIL will light up during step (5).
NOTICE:If the conditions in this test are not strictly followed, detection of the malfunction will not
be possible .
If you do not have a LEXUS hand–held tester, turn the ignition switch OFF after performing steps (3)
to (5), then perform steps (3) to (5) again.
DI09J–01
–
DIAGNOSTICS
ENGINE
DI–47
199
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check for open and short in harness and connector between ECM and heated
oxygen sensor (See page
).
NG
Repair or replace harness or connector.
OK
2
Check for heated oxygen sensor data.
PREPARATION:
(a)
Connect the OBD II scan tool or LEXUS hand–held tester to the DLC3.
(b)
Warm up engine to normal operating temp.
CHECK:
Read the heated oxygen sensor output voltage and short–term fuel trim.
RESULT:
Pattern
Heated oxygen sensor output voltage
Short–term fuel trim
1
Lean condition (Changes at 0.55 V or less)
Changes at about +20%
2
RIch condition (Changes at 0.4 V or more)
Changes at about –20%
3
Except 1 and 2
1, 2
Check fuel trim system (See page
).
3
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