Lexus ES300 (2002 year). Manual — part 390
05-158
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
311
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
INSPECT CAMSHAFT TIMING PULLEY
NG
REPLACE CAMSHAFT TIMING PULLEY
OK
CHECK AND REPLACE ECM
A61589
Battery
1
ALT
Driver
Side J/B
Stop Light
Switch
Passenger Side J/B
3A
G-W
G-W
Light Fallure Sensor
and Stop Light
G-W
19
IK1
ECM
E7
W
FL MAIN
1
B-G
1
2
Engine
Room
R/B
2E
2G 13
1
STOP
7
4
15
2G
2M
2K
G-W
STP
3A
51
91
Driver Side J/B
SB
1
2
7
B-G
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-159
312
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1520
STOP LIGHT SWITCH 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
Stop light switch does not turn off when repeating driving at 30
km or more 10 time or more after depressing brake (2 trip
detection logic)
Short in stop light switch signal circuit
Stop light switch
ECM
WIRING DIAGRAM
051MO-08
05-160
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
313
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
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
CHECK OPERATION OF STOP LIGHT
NG
REPAIR OR REPLACE STOP LIGHT SWITCH
CIRCUIT
OK
2
CHECK STP SIGNAL
(a)
Turn the ignition switch ON and push the hand-held tester main switch ON.
(b)
Read the STP signal on the hand-held tester.
Result:
Brake Pedal
STP Signal
Depressed
ON
Released
OFF
OK
CHECK FOR INTERMITTENT PROBLEMS
NG
3
CHECK HARNESS AND CONNECTOR(ECM - STOP LIGHT SWITCH)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
A61592
Engine Room J/B
E.F.I.
ECM
J11 J/C
Battery
FL MAIN
Engine Room R/B
1
B - G
A
EF
BR
BATT
2
2
1
1
B - G
B - Y
A
E1
9
1A
1B
E7
E8
B - Y
7
IF5
BR
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-161
314
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1600
ECM BATT MALFUNCTION
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air-fuel ratio adaptive control value memory, etc.
DTC No.
DTC Detecting Condition
Trouble Area
P1600
Open in back up power source circuit
Open in back up power source circuit
ECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
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.
051MP-09
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