Lexus ES300 (1997 year). Manual — part 315
A00217
ON
Engine Coolant
Temp. Sensor
ECM
5V
E2
THW
E9 Connector
BE6653
FI7056
FI7034
DI–36
–
DIAGNOSTICS
ENGINE
188
1997 LEXUS ES300 (RM511U)
5
Check for short in harness or ECM.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Disconnect the E9 connector of ECM.
HINT:Engine coolant temp. sensor connector is disconnected.
(c)
Turn ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or LEXUS hand–held
tester.
OK:
Temp. value: –40
°
C (–40
°
F)
OK
Repair or replace harness or connector.
NG
Check and replace ECM (See page
).
–
DIAGNOSTICS
ENGINE
DI–37
189
1997 LEXUS ES300 (RM511U)
DTC
P0116
Engine Coolant Temp. Circuit Range/
Performance problem
CIRCUIT DESCRIPTION
Refer to DTC P0115 (Engine Coolant Temp. Circuit Malfunction) on page
.
DTC No.
DTC Detecting Condition
Trouble Area
P0116
If THW –7
°
C (19.4
°
F), 20 min. or more after starting
engine, engine coolant temp. sensor value is 35
°
C (95
°
F) or
less
(2 trip detection logic)
Engine coolant temp. sensor
C
li
t
P0116
If THW –7
°
C (19.4
°
F), 5 min. or more after starting engine,
engine coolant temp. sensor value is 35
°
C (95
°
F) or less
(2 trip detection logic)
Cooling system
INSPECTION PROCEDURE
HINT:If DTC P0115 (Engine Coolant Temp. Circuit Malfunction) and P0116 (Engine Coolant Temp. Circuit
Range/Performance) are output simultaneously, engine coolant temp. sensor circuit may be open.
Perform troubleshooting of DTC P0115 first.
1
Are there any other codes (besides DTC P0116) being output?
YES
Go to relevant DTC chart.
NO
2
Check thermostat (See page
).
NG
Replace thermostat.
OK
Replace engine coolant temp. sensor.
DI09F–01
P24296
ECM
Throttle Position
Sensor
VC
VTA
E2
DI–38
–
DIAGNOSTICS
ENGINE
190
1997 LEXUS ES300 (RM511U)
DTC
P0120
Throttle/Pedal position Sensor/Switch ”A”
Circuit Malfunction
CIRCUIT DESCRIPTION
The throttle position sensor is mounted in the throttle body and
detects the throttle valve opening angle. When the throttle valve
is fully closed, a voltage of approximately 0.7 V is applied to ter-
minal VTA of the ECM. The voltage applied to the terminals VTA
of the ECM increases in proportion to the opening angle of the
throttle valve and becomes approximately 2.7
∼
5.2 V when the
throttle valve is fully opened. The ECM judges the vehicle driv-
ing conditions from these signals input from terminals VTA and
uses them as one of the conditions for deciding the air–fuel ratio
correction, power increase correction and fuel–cut control etc.
DTC No.
DTC Detecting Condition
Trouble Area
P0120
Condition (a) or (b) continues:
(a) VTA 0.1 V
(b) VTA 4.9 V
Open or short in throttle position sensor circuit
Throttle position sensor
ECM
HINT:After confirming DTC P0120 use the OBD II scan tool or LEXUS hand–held tester to confirm the throttle
valve opening percentage and closed throttle position switch condition.
Throttle valve opening position
expressed as percentage
Trouble Area
Throttle valve fully closed
Throttle valve fully open
Trouble Area
0 %
0 %
VC line open
VTA line open or short
Approx. 100 %
Approx. 100 %
E2 line open
DI09G–01
S05019
ECM
1
3
2
E9
E9
E9
1
7
22
5V
VC
VTA1
E2
Y
L
BR
Throttle Position Sensor
FI7052
–
DIAGNOSTICS
ENGINE
DI–39
191
1997 LEXUS ES300 (RM511U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:If DTC P0110, P0115, P0120 and P1410 are output simultaneously, E2 (Sensor Ground) may be open.
1
Connect OBD II scan tool or LEXUS hand–held tester, read throttle valve opening
percentage.
PREPARATION:
(a)
Connect the OBD II scan tool or LEXUS hand–held tester to DLC3.
(b)
Turn ignition switch ON and switch the OBD II scan tool or LEXUS hand–held tester main switch ON.
CHECK:
Read the throttle valve opening percentage.
OK:
Throttle valve
Throttle valve opening position
expressed as percentage
Fully open
Approx. 75 %
Fully closed
Approx. 10 %
OK
Check for intermittent problems
(See page
NG
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