Nissan Xterra. Manual - part 318
EC-398
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P1572 BRAKE PEDAL POSITION SWITCH
P1572 BRAKE PEDAL POSITION SWITCH
Component Description
INFOID:0000000009484140
When the brake pedal is depressed, brake pedal position switch is turned OFF and stop lamp switch is turned
ON. ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).
for the ASCD function.
On Board Diagnosis Logic
INFOID:0000000009484141
This self-diagnosis has the one trip detection logic.
The MIL will not illuminate for this diagnosis.
NOTE:
• If DTC P 1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
• 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 is turn OFF. And even when malfunction A is detected in
two consecutive trips, DTC is not stored in ECM memory.
DTC Confirmation Procedure
INFOID:0000000009484142
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
• The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure
for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B
can be detected.
• If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Steps 4 and 5 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT
1. Start engine (VDC switch OFF).
2. Select “DATA MONITOR” mode with CONSULT.
3. Press MAIN switch and make sure that CRUISE indicator illuminates.
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition
Possible Cause
P1572
1572
Brake pedal position
switch
A)
When the vehicle speed is above 30km/h (19
MPH), ON signals from the stop lamp switch
and the brake pedal position switch are sent
to ECM at the same time.
• Harness or connectors
(The stop lamp switch circuit is shorted.)
• Harness or connectors
(The brake pedal position switch circuit is
shorted.)
• Harness or connector
(The clutch pedal position switch circuit is
shorted)
(M/T models)
• Stop lamp switch
• Brake pedal position switch
• Clutch pedal position switch
• Incorrect stop lamp switch installation
• Incorrect brake pedal position switch instal-
lation
• Incorrect clutch pedal position switch instal-
lation
• ECM
B)
brake pedal position switch signal is not sent
to ECM for extremely long time while the ve-
hicle is being driven