DTC P1520 Stop Light Switch Signal Malfunction - caphector.com
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 ...
Stop Light Switch Signal Malfunction (Only for A/T)
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
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 S4 Stop Light Switch 1 2 G-W
G-B
Instrument Panel J/B 2 2 G-W 1B 1H
Engine ECU 15 IE2
G-W
6 E7
STP
3 1T
J10 J/C
Instrument Panel J/B STOP
8 1B
G-W C G-W C
1 1C
C
C
G-W
G-W
1 1 B* *2 B-G
R6 Stop Light LH
6
Fusible Link Block 4 ALT F6
W-B
1
6
R7 Stop Light RH
1
2
H7 High Mounted Stop Light
W-B W-B
W-B BI
Battery
BG
*1: Puerto Rico *2: Except Puerto Rico
A09139
A14313
2002 ECHO (RM884U)
Author:
Date:
299
DI-130 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.
PREPARATION: 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-37 ).
OK
2
Check STP signal. ON STP
(-)
Brake Pedal Depressed
(+)
Brake Pedal Released
When using TOYOTA hand-held tester: PREPARATION: (a) Connect the to the DLC3. (b) Turn the ignition switch ON and TOYOTA hand-held tester main switch ON. CHECK: Read the STP signal on the TOYOTA hand-held tester. OK: Brake pedal is depressed: STP ... ON Brake pedal is released: STP ... OFF When not using TOYOTA hand-held tester: PREPARATION: (a) Remove the connector cover from the ECM. (b) Turn the ignition switch ON. CHECK: Check voltage between terminal STP of ECM and body ground. OK:
D05642
OK
Brake pedal
Voltage
Depressed
7.5 - 14 V
Released
Below 1.5 V
Check for intermittent problems (See page DI-3 ).
NG 2002 ECHO (RM884U)
Author:
Date:
300
DI-131 DIAGNOSTICS
3
-
ENGINE
Check harness and connector between ECM and stop light switch (See page IN-29 ).
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