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DI-129
DIAGNOSTICS - ENGINE
DI6VM-02
DTC P1520 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 re-
duced slightly when the vehicle is braking.).
DTC No. DTC Detecting Condition Trouble Area
The stop light switch does not turn off even once the vehicle is S Short in stop light switch signal circuit
P1520 driven S Stop light switch
(2 trip detection logic) S ECM
WIRING DIAGRAM
S4 Engine ECU
Stop Light Switch Instrument Panel J/B
2 2 15 6
G-B 2 1 G-W G-W G-W
1B 1H IE2 E7 STP
3 1T
G-W
C
J10 G-W
Instrument Panel J/B J/C C
C C
8 STOP 1
1B 1C
G-W G-W
1 R6 1 1
1 R7 H7
B* Stop Stop High Mounted
*2 Light Light Stop Light
B-G 6 LH 6 RH 2
Fusible Link Block W-B
4 W-B
ALT
F6
W-B
W-B
Battery BI 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 When using TOYOTA hand-held tester:
STP PREPARATION:
(a) Connect the to the DLC3.
(b) Turn the ignition switch ON and TOYOTA hand-held tes-
ter 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:
Brake Pedal Brake Pedal PREPARATION:
Depressed Released
(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:
Brake pedal Voltage
D05642
Depressed 7.5 - 14 V
Released Below 1.5 V
OK Check for intermittent problems (See page
DI-3 ).
NG
2002 ECHO (RM884U)
Author : Date : 300
DI-131
DIAGNOSTICS - ENGINE
3 Check harness and connector between ECM and stop light switch (See page
IN-29 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 301
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