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DI-1017
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
DIDVD-01
DTC P0724 Brake Switch "B" Circuit High
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling while driving in lock-up condition when
brakes are suddenly applied.
When the brake pedal is depressed, this switch sends a signal to the ECM. Then the ECM cancels the opera-
tion of the lock-up clutch while braking is in progress.
DTC No. DTC Detection Condition Trouble Area
The stop light switch remains ON even when the vehicle is S Short in stop light switch signal circuit
P0724 driven in a STOP (less than 3 km/h (2 mph)) and GO (30 km/h S Stop light switch
(19 mph) or more) fashion 5 times. (2-trip detection logic). S ECM
MONITOR DESCRIPTION
This DTC indicates that the stop light switch remains on. When the stop light switch remains ON during "stop
and go" driving, the ECM interprets this as a fault in the stop light switch and the MIL comes on and the ECM
stores the DTC. The vehicle must stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) ten
times for two driving cycles in order to detect a malfunction.
MONITOR STRATEGY
Related DTCs P0724 Stop light switch/Range check/Rationality
Main Stop light switch
Required sensors/Components
R i d /C t
Sub Vehicle speed sensor
Frequency of operation Continuous
Duration GO and STOP 5 times
MIL operation 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-963
not present.
Battery voltage 8 V or more -
Ignition switch ON
Starter OFF
GO (Vehicle speed is 30 km/h
Once
(18.63 mph) or more)
STOP (Vehicle speed is less than 3 km/h
Once
(1.86 mph))
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria Threshold
Brake switch Remain ON during GO and STOP 5 times
DI-1018
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
WIRING DIAGRAM
See page DI-261.
INSPECTION PROCEDURE
1 Read value of DATA LIST (STP signal).
HINT:
According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value
of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of
troubleshooting is one method to shorten labor time.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the OBD II scan tool or hand-held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Push the "ON" button of the OBD II scan tool or the hand-held tester.
(f) When you use the hand-held tester:
Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST".
(g) According to the display on the tester, read the "DATA LIST".
Standard:
Measurement Item/
Item Normal Condition
Range (display)
Stop light SW Status/ S Brake Pedal is depressed: ON
Stop Light Switch
ON or OFF S Brake Pedal is released: OFF
NOTICE:
In the table above, the conditions listed under "Normal Condition" are reference conditions. Do not
depend solely on these reference conditions when deciding whether a part is faulty or not.
OK:
Brake Pedal Condition Specified Condition
Depressed ON
Released OFF
NG Go to step 2.
OK
Go to step 3.
DI-1019
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
2 Inspect stop light switch.
PREPARATION:
Remove the stop lamp switch assy.
Free Pushed in 2 1 CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Switch position Tester Connection Specified Condition
3 Switch pin free 1-2 Below 1
4
I27048
Switch pin pushed in 10 k or higher
Switch pin free 3-4 10 k or higher
Switch pin pushed in Below 1
NG Replace stop light switch.
OK
3 Check harness and connector (ECM - stop light switch).
ECM: PREPARATION:
E7 E6 E5 E4 E3 Install the stop lamp switch assy.
CHECK:
Measure the voltage according to the value(s) in the table be-
low when the brake pedal is depressed and released.
OK:
Condition Tester Connection Specified Condition
STP(+) E3 - 15 (STP) -
Brake pedal is depressed 10 to 14 V
D14167 Body ground
Brake pedal is released Below 1 V
NG Repair or replace harness or connector
(See page IN-30).
OK
Replace the ECM (See page SF-66).
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