Lexus ES300 (2002 year). Manual — part 355
A53763
E2
THA
A54406
E10
05-40
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
193
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER(CHECK FOR
OPEN)
(a)
Connect the terminals THA with E2 of the ECM connector.
HINT:
Before checking, do a visual check and connector connection
inspection of the ECM.
(b)
Read temperature value on the hand-held tester.
Temperature: 140
°
C (284
°
F) or more
OK
CHECK AND REPLACE HARNESS AND
CONNECTOR
NG
CHECK AND REPLACE ECM
4
READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER(CHECK FOR
SHORT)
(a)
Disconnect the intake air flow meter connector.
(b)
Turn the ignition switch ON.
(c)
Read temperature value on the hand-held tester.
Temperature: -40
C (-40
F)
OK
REPLACE INTAKE AIR FLOW METER
SUB-ASSY
NG
5
READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER(CHECK FOR
SHORT)
(a)
Disconnect the ECM E10 connector.
(b)
Turn the ignition switch ON.
(c)
Read temperature value on the hand-held tester.
Temperature: -40
°
C (-40
°
F)
OK
REPAIR OR REPLACE HARNESS AND
CONNECTOR
NG
CHECK AND REPLACE ECM
A00310
A60786
G - B
BR
19
28
E10
E10
E2
THW
R
5V
E1
ECM
E.F.I. Engine Coolant Temp. Sensor
2
1
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-41
194
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P0115
ENGINE COOLANT TEMP. CIRCUIT
MALFANCTION
CIRCUIT DESCRIPTION
A thermistor built into the water temp. sensor changes the resistance value according to the water tempera-
ture.
The structure of the sensor and connection to the ECM is the same as the ones of the air temperature sensor.
If the ECM detects the DTC P0115, it operates the fail-safe functions in which the engine coolant tempera-
ture is assumed to be 80
C (176
F).
DTC No.
DTC Detecting Condition
Trouble Area
P0115
Open or short in water temp. sensor circuit
Open or short in water temp. sensor circuit
E.F.I. engine coolant temperature sensor
ECM
HINT:
After confirming DTC P0115, use the OBD II scan tool or hand-held tester to confirm the engine coolant
temperature from the CURRENT DATA.
Temp. Displayed
Malfunction
-40
C (-40
F)
Open circuit
140
C (284
F) or more
Short circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTC P0110 (Intake Air Temp. Circuit Malfunction), P0115 (Water Temp. Circuit Malfunction), P0120
(Throttle/Pedal Position Sensor/Switch ”A” Malfunction) are output simultaneously, E1, E2 etc. (Sen-
sor Ground system) may be open.
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 running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc. at the time
of the malfunction.
051LX-08
1
2
A50582
A53763
THW
E2
05-42
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
195
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
1
READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER(COOLANT
TEMP/WATER TEMP)
(a)
Read temperature value on the hand-held tester.
Temperature: The same as actual water temperature
Result:
A
B
C
-40
C (-40
F)
140
C (284
F)
OK
B
Go to step 4
C
CHECK FOR INTERMITTENT PROBLEMS
A
2
READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER(CHECK FOR
OPEN)
SST
09843-18040
(a)
Disconnect the water temperature sensor connector.
(b)
Connect the terminals 1 with 2 of the water temperature
sensor connector.
(c)
Turn the ignition switch ON.
(d)
Read temperature value on the hand-held tester.
Temperature: 140
°
C (284
°
F) or more
OK
REPLACE E.F.I. ENGINE COOLANT
TEMPERATURE SENSOR
NG
3
READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER(CHECK FOR
OPEN)
(a)
Connect the terminals THW with E2 of the ECM connec-
tor.
(b)
Turn the ignition switch ON.
(c)
Read temperature value on the hand-held tester.
Temperature: 140
°
C (284
°
F) or more
OK
REPAIR OR REPLACE HARNESS AND
CONNECTOR
NG
CHECK AND REPLACE ECM
A54406
E10
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-43
196
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER(CHECK FOR
SHORT)
(a)
Disconnect the water temp. sensor connector.
(b)
Turn the ignition switch ON.
(c)
Read temperature value on the hand-held tester.
Temperature: -40
°
C (-40
°
F)
OK
REPLACE E.F.I. ENGINE COOLANT
TEMPERATURE SENSOR
NG
5
READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER(CHECK FOR
SHORT)
(a)
Disconnect the ECM E10 connector.
(b)
Turn the ignition switch ON.
(c)
Read temperature value on the hand-held tester.
Temperature: -40
°
C (-40
°
F)
OK
REPAIR OR REPLACE HARNESS AND
CONNECTOR
NG
CHECK AND REPLACE ECM
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