Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip1520
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DI-132
DIAGNOSTICS - ENGINE
DI4FB-02
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
Stop light switch does not turn off when repeating the driving at S Short in stop light switch signal circuit
P1520 30 km or more 10 times or more after depressing brake S Stop light switch
(2 trip detection logic) S ECM
WIRING DIAGRAM
ECM
Driver Side J/B No.1 Driver Side J/B No.1 J/B No.3
Stop Light Switch
4 STOP 7 4 5 18 6 15 STP
W-R W G-W G-W G-W
1B 1C 1R 1R 3B 3B E8
2 1
2 1S
1 F9 E1
INP
Fusible
Link G-W
Block
ALT
1 F8
To Stop Light
B-L
FL
MAIN
Battery
A07527
2001 SIENNA (RM787U)
Author : Date : 286
DI-133
DIAGNOSTICS - ENGINE
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. 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.
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.
ON When using TOYOTA hand-held tester:
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
Brake Pedal Brake Pedal (b) Turn the ignition switch ON and push the TOYOTA hand-
Depressed Released
held tester main switch ON.
CHECK:
Read the STP signal on the TOYOTA hand-held tester.
OK:
Brake pedal is depressed: STP ...... ON
ON Brake pedal is released: STP ...... OFF
When not using TOYOTA hand-held tester:
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check voltage between terminal STP of the ECM connector
and body ground.
OK:
STP (+)
Brake pedal Voltage
A02037
Depressed 7.5 14 V
Released Below 1.5 V
OK Check for intermittent problems
(See page DI-3 ).
NG
2001 SIENNA (RM787U)
Author : Date : 287
DI-134
DIAGNOSTICS - ENGINE
3 Check harness and connector between ECM and stop light switch
(See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 288
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