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DI-481
DIAGNOSTICS - CRUISE CONTROL SYSTEM (DENSO Made)
DI3CJ-18
DTC P1520/52 Stop light switch circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives
this signal, it cancels the cruise control.
A fail-safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel condition is that battery positive voltage is supplied to terminal STP.
When the brake is on, battery positive voltage is normally applied through the STOP fuse and stop light
switch to terminal STP of the ECM, and the ECM turns the cruise control OFF.
If the harness connected to terminal STP has an open circuit, terminal STP will have battery positive voltage
and the cruise control will be turned OFF.
DTC No. DTC Detection Condition Trouble Area
S Stop light switch
P1520/52 Stop light switch circuit S Harness or connector between ECM and stop light switch
S ECM
WIRING DIAGRAM
S4 ECM
Stop Light S/W
Center J/B
15 11 20
G-Y G-W G-W
3C 3C E14 STP
2 1
9
B-L R-B
E12 ST1-
3 4
From From
Battery Ignition SW
I22540
I21251
2002 4RUNNER (RM887U)
Author : Date : 657
DI-482
DIAGNOSTICS - CRUISE CONTROL SYSTEM (DENSO Made)
INSPECTION PROCEDURE
HINT:
In case of using the TOYOTA hand-held tester, start the inspection from step 1 and in case of not using the
TOYOTA hand-held tester, start it from step 2.
1 Check stop light switch using TOYOTA hand-held tester.
PREPARATION:
Connect the TOYOTA hand-held tester to the DLC3.
CHECK:
Check the stop light switch using DATA LIST.
OK:
Condition STP LIGHT SW1-S (Sub CPU) STP LIGHT SW2-S (Sub CPU) STP LIGHT SW2-M (Main CPU)
Depressed ON ON ON
Released OFF OFF OFF
HINT:
S STP LIGHT SW1 has a function to disconnect the connection (OFF) when depressing the pedal, how-
ever, the ECM is control by the logic reverse, so with the TOYOTA hand-held tester, it displays ON.
S STP LIGHT SW1 indicates an input of the ST1- terminal and STP LIGHT SW2 indicates an input of
the STP terminal.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI-479 ).
NG
2 Check operation of stop light.
CHECK:
Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal
is released.
NG Check stop light system (See page BE-32 ).
OK
2002 4RUNNER (RM887U)
Author : Date : 658
DI-483
DIAGNOSTICS - CRUISE CONTROL SYSTEM (DENSO Made)
3 Check voltage between terminal STP of ECM connector and body ground.
PREPARATION:
ON (a) Remove the ECM with connectors being connected.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal STP of the ECM con-
nector and the body ground when the brake pedal is depressed
STP and released.
OK:
Brake Pedal Voltage
(+) (-)
Depressed 7.5 - 14 V
Released 0 - 1.5 V
I21252 I22539
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI-479 ).
NG
4 Check voltage between terminal ST1- of ECM connector and body ground.
PREPARATION:
ON (a) Remove the ECM with connectors being connected.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal ST1- of the ECM con-
nector and the body ground when the brake pedal is depressed
ST1- and released.
OK:
Brake Pedal Voltage
(+) (-) Depressed Below 1 V
Released 7.5 - 14 V
OK Proceed to next circuit inspection shown in
I21253 I22541 problem symptoms table (See page DI-479 ).
NG
2002 4RUNNER (RM887U)
Author : Date : 659
DI-484
DIAGNOSTICS - CRUISE CONTROL SYSTEM (DENSO Made)
5 Check harness and connector between terminal STP of ECM and stop light
switch, and terminal ST1- of ECM and stop light switch (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28 ).
2002 4RUNNER (RM887U)
Author : Date : 660
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