Lexus ES300 (2002 year). Manual — part 359
A52607
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
209
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
CHECK HARNESS AND CONNECTOR(ECM - A/F SENSOR)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
5
INSPECT AIR FUEL RATIO SENSOR(CHECK HEATER RESISTANCE)
(a)
Disconnect the air fuel ratio sensor.
(b)
Measure resistance between the terminals HT and +B of
the air fuel ratio sensor.
Resistance: 2.16 - 2.88
Ω
(20
C)
NG
REPLACE AIR FUEL RATIO SENSOR
OK
6
CHECK AIR INDUCTION SYSTEM (See page
NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK
7
CHECK FUEL PRESSURE (See page
NG
REPAIR OR REPLACE FUEL SYSTEM
OK
8
INSPECT FUEL INJECTOR ASSY (See page
NG
REPLACE FUEL INJECTOR ASSY
OK
9
CHECK EXHAUST GAS LEAK
NG
REPAIR OR REPLACE EXHAUST GAS
LEAKAGE POINT
OK
REPLACE AIR FUEL RATIO SENSOR
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-57
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
10
PERFORM CONFIRMATION DRIVING PATTERN (See page
GO
11
READ OUTPUT DTC(DTC P0125 OUTPUT AGAIN)
YES
CHECK AND REPLACE ECM
NO
12
CONFIRM VEHICLE RUNS OUT OF FUEL IN THE PAST
NO
CHECK FOR INTERMITTENT PROBLEMS
YES
DTC P0125 IS CAUSED BY RUNNING OUT OF FUEL
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P0128
THERMOSTAT MALFUNCTION
CIRCUIT DESCRIPTION
If the water temperature becomes 75
°
C (167
°
F) or more, it is abnormal.
If not due to the thermostat malfunction, it is abnormal.
DTC No.
DTC Detecting Condition
Trouble Area
P0128
Condition (a), (b) or (c):
(a) After starting engine at 20
°
C (68
°
F)
(b) After engine is warmed up
(c) THW < 75
°
C (167
°
F)
Thermostat
Cooling system
E.F.I. engine coolant temp. sensor
ECM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand-held tester or OBD II scan tool. Because freeze frame records the en-
gine 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
INSPECT THERMOSTAT (See page
NG
REPLACE THERMOSTAT
OK
2
CHECK OTHER DTC OUTPUT(BESIDES DTC P0128)
YES
GO TO RELEVANT DTC CHART
NO
CHECK AND REPLACE ECM
051M2-06
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P0136
HEATED OXYGEN SENSOR CIRCUIT
MALFUNCTION(BANK1 SENSOR2)
DTC
P0156
HEATED OXYGEN SENSOR CIRCUIT
MALFUNCTION (BANK2 SENSOR2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page
DTC No
DTC Detecting Condition
Trouble Area
P0136
P0156
Condition (a) and (b) continues for 60 secs. or more:
(a) Voltage output of oxygen sensor remains at 0.35 V or more,
or 0.55 V or less, during idling after engine is warmed up
(b) Oxygen sensor output voltage amplitude is less than 0.3 V.
Oxygen sensor
Fuel trim malfunction
HINT:
After confirming DTC P0125, use the hand−held tester to confirm voltage output of the oxygen sensor (bank
1 sensor 2) from the CURRENT DATA.
If voltage output of the oxygen sensor (bank 1 sensor 2) is less than 0.1 V, oxygen sensor (bank 1 sensor
2) circuit may be open or short.
056H6-01
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