Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne di eg5vzfe cip1520
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DI-138
DIAGNOSTICS - ENGINE (5VZ-FE)
DI1D3-06
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 reduced slightly when the vehicle is braking.)
DTC No. DTC Detecting Condition Trouble Area
S Short in stop light switch signal circuit
Stop light switch does not turn off even once vehicle is driven
P1520 S Stop light switch
(2 trip detection logic)
S ECM
HINT:
In this circuit, diagnosis can only be made in the check mode.
WIRING DIAGRAM
S4
Stop Light ECM
Switch Center J/B
15 11 20 STP
G-Y 2 1 G-W G-W
3C 3C E14
1F 2
J14 16 3C
Driver J/C
STOP
B B G-W
10 G-W
Side G-W IE2 G-W
J/B
B G-W
1K 2
G-W 10 IL1
W-R 4 BR1
2 G-W
H8 G-W
Engine 2 1 High Mounted
J/B
Room
1 2 Stop Light R7 2 2 R8
R/B
Stop Light Stop Light
2 W-B 3 LH RH
BR1
W
W-B
Battery
BH
A07744
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the 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 deter-
mining 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.
2002 4RUNNER (RM887U)
Author : Date : 314
DI-139
DIAGNOSTICS - ENGINE (5VZ-FE)
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 (See page
BE-32 ).
OK
2 Check STP signal.
When using TOYOTA hand-held tester:
ON
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 Release held tester main switch ON.
CHECK:
Read the STP signal on the TOYOTA hand-held tester.
OK:
Brake Pedal STP Signal
STP
Depressed ON
Release OFF
When not using TOYOTA hand-held tester:
PREPARATION:
Turn the ignition switch ON.
CHECK:
(-) (+) Check the voltage between terminal STP of the ECM connector
BE6653 and body ground.
Q06993
BE6653 OK:
S04161 A15322
Brake Pedal Voltage
Depressed 7.5 - 14 V
Release Below 1.5 V
OK Check for intermittent problems
(See page DI-20 ).
NG
2002 4RUNNER (RM887U)
Author : Date : 315
DI-140
DIAGNOSTICS - ENGINE (5VZ-FE)
3 Check harness and connector between stop light switch and ECM
(See page DI-18 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28 ).
2002 4RUNNER (RM887U)
Author : Date : 316
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