Toyota Sequoia (2005). Manual — part 439
DI3CI–19
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–1551
1745
CIRCUIT INSPECTION
DTC
P0500/21 Vehicle speed sensor circuit malfunction
DTC
P0503/23 Vehicle speed sensor circuit malfunction
CIRCUIT DESCRIPTION
See page
DTC No.
DTC Detection Condition
Trouble Area
P0500/21
This trouble code is output when the vehicle speed signal from
the vehicle speed sensor is cut for 0.14 sec. or more while the
cruise control is in operation.
Vehicle speed sensor
Vehicle speed sensor signal circuit
ECM
P0503/23
Momentary interruption and noise are detected when a rapid
change of vehicle speed occurs while the cruise control is in
operation.
Vehicle speed sensor
Vehicle speed sensor signal circuit
ECM
WIRING DIAGRAM
See page
INSPECTION PROCEDURE
See page
I24840
Battery
1
17
1E
AM2
1
2
W–R
I18
Ignition SW
B–R
IG2
8
5
E4
ECM
ST1–
1
STOP
16
5
S14
Stop Light SW
7
G–Y
3
6
E4
STP
1C
B–O
3
F10 FL Block
ALT
IGN1
B
B
W
1F
1L
1
2D
2C
15
W–R
AM2
ST2
1C
2
1J
2
4A
2
B–O
W
4
2
G–Y
Instrument Panel J/B
Sub J/B No. 4
Engine Room J/B
Instrument Panel J/B
4
L–B
Sub J/B No. 4
4D
1
1
4A
4E
DI–1552
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
1746
DTC
P0571/52 Stop light switch circuit malfunction
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch assy sends a signal to the ECM. When the ECM
receives this signal, it cancels the cruise control.
Fail–safe function operates to enable normal driving even if there is a malfunction in the stop light signal
circuit.
The cancel condition occurs when positive battery voltage is applied to terminal STP.
When the brake is applied, battery positive voltage is normally applied to terminal STP of the ECM through
the STOP fuse and the stop light switch assy, and the ECM turns the cruise control off.
DTC No.
DTC Detection Condition
Trouble Area
P0571/52
Stop light switch does not turn off even once the vehicle is
driven
Stop light switch assy
Stop light switch assy circuit
ECM
WIRING DIAGRAM
DIAB6–05
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–1553
1747
INSPECTION PROCEDURE
HINT:
When using the hand–held tester, start the inspection from step 1 and when not using the hand–held tester,
start from step 2.
1
Read value on hand–held tester.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch to the ON position, and turn the hand–held tester main switch on.
(c)
Select the item ”STP LIGHT SW2 M”, ”STP LIGHT SW2 S” and ”STP LIGHT SW1 S” in the DATA LIST,
and read its value displayed on the hand–held tester.
CHECK:
Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal
is released.
CCS (ECM):
Item
Measurement Item
/Display (Range)
Normal Condition
Diagnostic Note
STP LIGHT SW2 M
Stop light SW signal (Main CPU)
/ON or OFF
ON: Brake pedal depressed
OFF: Brake pedal released
–
STP LIGHT SW2 S
Stop light SW signal (Sub CPU)
/ON or OFF
ON: Brake pedal depressed
OFF: Brake pedal released
–
STP LIGHT SW1 S
Stop light SW signal (Sub CPU)
/ON or OFF
ON: Brake pedal depressed
OFF: Brake pedal released
–
OK:
When the brake pedal is operated, the normal conditions listed above are shown on the display.
RESULT:
NG
A
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
B
OK (When troubleshooting according to the DTC chart)
C
B
Proceed to next circuit inspection shown in
problem symptoms table (See page
C
Replace ECM (See page
A
I21525
Pushed in
Free
Stop Light Switch:
DI–1554
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
1748
2
Check operation of stop light.
CHECK:
Check that stop lights come on when the brake pedal is depressed, and go off when the brake pedal is re-
leased.
OK:
The stop lights operate normally.
OK
Go to step 5.
NG
3
Inspect stop light switch assy.
PREPARATION:
Disconnect the stop light switch assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Switch condition
Tester connection
Specified condition
Switch pin free
1 – 4
Below 1
Ω
Switch pin free
2 – 3
10 k
Ω
or higher
Switch pin pushed in
1 – 4
10 k
Ω
or higher
Switch pin pushed in
2 – 3
Below 1
Ω
NG
Replace stop light switch assy.
OK
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