Lexus ES300 (1997 year). Manual — part 336
A00381
ON
E2(–)
VC(+)
S05696
BE6653
–
DIAGNOSTICS
ENGINE
DI–121
273
1997 LEXUS ES300 (RM511U)
4
Check voltage between terminals VC and E2 of ECM connector.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals VC and E2 of ECM con-
nector.
OK:
Voltage: 4.5
∼
5.5 V
NG
Check and replace ECM (See page
OK
Check for open and short in harness and
connector between ECM and EGR valve
position sensor (VC line).
DI–122
–
DIAGNOSTICS
ENGINE
274
1997 LEXUS ES300 (RM511U)
DTC
P1411
EGR Valve Position Sensor Circuit
Range/Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P1410 (EGR Valve Position Sensor Circuit Malfunction) on page
DTC No.
DTC Detecting Condition
Trouble Area
P1411
Conditions (a) and (b) continue for 7 sec. or more:
(2 trip detection logic)
(a) Engine Coolant Temp. < 55
°
C (131
°
F)
(b) EGLS
1.65 V or EGLS < 0.35 V
EGR valve position sensor
INSPECTION PROCEDURE
1
Are there any other codes (besides DTC P1411) being output?
YES
Go to relevant DTC chart.
NO
Replace EGR valve position sensor.
DI0A3–01
A00953
Fusible
Link
Block
FL
MAIN
Battery
Stop Light Switch
B–R
B–G
AL
T
1B
1C
F11
F6
STOP
4
7
G–W
W
2
1
1R
1R
1S
4
5
2
G–W
Light
Failure
Sensor
7
2
To Stop Light
G–W
G–W
J27 Junction
Connector
1
E7
24
ECM
STP
E1
Instrument Panel J/B
Instrument Panel J/B
1
–
DIAGNOSTICS
ENGINE
DI–123
275
1997 LEXUS ES300 (RM511U)
DTC
P1520
Stop Light Switch Signal Malfunction
CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights.
The STP signal is used mainly to control the fuel cut–off engine speed (The fuel cut–off engine speed is re-
duced slightly when the vehicle is braking.).
DTC No.
DTC Detecting Condition
Trouble Area
P1520
The stop light switch does not turn off even once the vehicle is
driven
(2 trip detection logic)
Short in stop light switch signal circuit
Stop light switch
ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
DI0A4–01
A00240
ON
ON
STP(+)
Brake Pedal
Depressed
Brake Pedal
Released
BE6653
Q06993
BE6653
S04161
DI–124
–
DIAGNOSTICS
ENGINE
276
1997 LEXUS ES300 (RM511U)
1
Check operation of stop light.
CHECK:
Check if the stop lights go on and off normally when the brake
pedal is operated and released.
NG
Check and repair stop light circuit.
OK
2
Check STP signal.
When using LEXUS hand–held tester:
PREPARATION:
(a)
Connect the LEXUS hand–held tester to the DLC3.
(b)
Turn ignition switch ON and LEXUS hand–held tester
main switch ON.
CHECK:
Read the STP signal on the LEXUS hand–held tester.
OK:
Brake pedal is depressed: STP. ..ON
Brake pedal is released: STP. ..OFF
When not using LEXUS hand–held tester:
PREPARATION:
Turn ignition switch ON.
CHECK:
Check voltage between terminal STP of ECM and body ground.
OK:
Brake pedal
Voltage
Depressed
7.5
∼
14 V
Released
Below 1.5 V
OK
Check for intermittent problems
(See page
).
NG
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