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EC-792
[QR (WITHOUT EURO-OBD)]
DTC P1572 ASCD BRAKE SWITCH
DTC P1572 ASCD BRAKE SWITCH PFP:25320
Component Description BBS001RI
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by this input of two kinds (ON/OFF signal).
Refer to EC-971, "
AUTOMATIC SPEED CONTROL DEVICE
(ASCD)" for the ASCD function.
CONSULT-II Reference Value in Data Monitor Mode BBS001RJ
Specification data are reference values.
On Board Diagnosis Logic BBS001RK
This self-diagnosis has the one trip detection logic.
The MI will not light up for this diagnosis.
NOTE:
● If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-718, "
DTC P0605 ECM".
● This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
SEC009D
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW1
(ASCD brake switch)
● Ignition switch: ON
Clutch pedal (M/T) and brake pedal:
Fully released
ON
Clutch pedal (M/T) and/or brake pedal:
Slightly depressed
OFF
BRAKE SW2
(Stop lamp switch)
● Ignition switch: ON
Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition Possible Cause
P1572
1572
ASCD brake switch
A)
When the vehicle speed is above 30km/h
(19 MPH), ON signals from the stop lamp
switch and the ASCD brake switch are sent
to ECM at the same time.
● Harness or connectors
(The stop lamp switch circuit is shorted.)
● Harness or connectors
(The ASCD brake switch circuit is shorted.)
● Harness or connectors
(The ASCD clutch switch circuit is shorted.)
(M/T models)
● Stop lamp switch
● ASCD brake switch
● ASCD clutch switch
(M/T models)
● Incorrect stop lamp switch installation
● Incorrect ASCD brake switch installation
● Incorrect ASCD clutch switch installation
(M/T models)
● ECM
B)
ASCD brake switch signal is not sent to
ECM for extremely long time while the vehi-
cle is driving
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