Nissan Qashqai (2007-2010). Manual — part 252
P1572 ASCD BRAKE SWITCH
EC-527
< COMPONENT DIAGNOSIS >
[HR16DE (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
YES
>> GO TO 11.
NO
>> Replace ASCD brake switch.
8.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ECM harness connector and ASCD brake switch harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK ASCD CLUTCH SWITCH
EC-529, "Component Inspection (ASCD Clutch Switch)"
.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace ASCD clutch switch.
10.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check the voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 12.
11.
DETECT MALFUNCTIONING PART
Check the following.
• 10A fuse (No.11)
• Harness for open or short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
12.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check the continuity between ECM harness connector and stop lamp switch harness connector.
3.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 14.
NG
>> GO TO 13.
13.
DETECT MALFUNCTIONING PART
ECM
ASCD brake switch
Continuity
Connector
Terminal
Connector
Terminal
E16
100
E112
2
Existed
Stop lamp switch
Ground
Voltage
Connector
Terminal
E114
1
Ground
Battery voltage
ECM
Stop lamp switch
Continuity
Connector
Terminal
Connector
Terminal
E10
106
E114
2
Existed
EC-528
< COMPONENT DIAGNOSIS >
[HR16DE (WITHOUT EURO-OBD)]
P1572 ASCD BRAKE SWITCH
Check the following.
• Harness for open or short between ECM and stop lamp switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
14.
CHECK STOP LAMP SWITCH
EC-530, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace stop lamp switch.
15.
CHECK INTERMITTENT INCIDENT
Refer to .
>> INSPECTION END
GI-39, "Intermittent Incident"
Component Inspection (ASCD Brake Switch)
INFOID:0000000001116286
1.
CHECK ASCD BRAKE SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH-II
1.
Adjust ASCD brake switch installation. Refer to
BR-8, "Inspection and Adjustment"
.
2.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD brake switch.
Component Inspection (ASCD Clutch Switch)
INFOID:0000000001116287
1.
CHECK ASCD CLUTCH SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD clutch switch harness connector.
3.
Check the continuity between ASCD clutch switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Clutch pedal
Fully released
Existed
Slightly depressed
Not existed
P1572 ASCD BRAKE SWITCH
EC-529
< COMPONENT DIAGNOSIS >
[HR16DE (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
NO
>> GO TO 2.
2.
CHECK ASCD CLUTCH SWITCH-II
1.
Adjust ASCD clutch switch installation. Refer to
CL-5, "Inspection and Adjustment"
.
2.
Check the continuity between ASCD clutch switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD clutch switch.
Component Inspection (Stop Lamp Switch)
INFOID:0000000001116288
1.
CHECK STOP LAMP SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check the continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH-II
1.
Adjust stop lamp switch installation. Refer to
BR-18, "Inspection and Adjustment"
2.
Check the continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp switch.
Terminals
Condition
Continuity
1 and 2
Clutch pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
EC-530
< COMPONENT DIAGNOSIS >
[HR16DE (WITHOUT EURO-OBD)]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000001116289
The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combina-
tion meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
control. Refer to
for ASCD functions.
DTC Logic
INFOID:0000000001116290
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC U1001, first perform the trouble diagnosis for DTC U1001. Refer
• If DTC P1574 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine.
2.
Drive the vehicle at more than 40 km/h (25 MPH).
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
This procedure 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.
3.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001116291
1.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace.
2.
CHECK COMBINATION METER
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1574
ASCD vehicle speed
sensor
ECM detects a difference between two vehicle
speed signals is out of the specified range.
• Harness or connectors
(The CAN communication line is open or
shorted.)
(Combination meter circuit is open or shorted.)
• Combination meter
• ABS actuator and electric unit (control unit)
• Wheel sensor
• ECM
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