Nissan Cube. Manual — part 367
EC-354
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
P1572 ASCD BRAKE SWITCH
P1572 ASCD BRAKE SWITCH
Description
INFOID:0000000009947480
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
for the ASCD function.
DTC Logic
INFOID:0000000009947481
DTC DETECTION LOGIC
NOTE:
• If DTC P1572 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 OFF. And even when malfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
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.
NOTE:
Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for mal-
function B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1.
Start engine.
2.
Press MAIN switch and make sure that CRUISE indicator is displayed in combination meter.
3.
Drive the vehicle for at least 5 consecutive seconds under the following conditions.
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.
4.
Check DTC.
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1572
ASCD brake switch
A)
When the vehicle speed is above 30 km/h
(19 MPH), ON signals from the stop lamp
switch and the ASCD brake switch are sent
to the 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.)
• Stop lamp switch
• ASCD brake switch
• ASCD clutch switch
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• Incorrect ASCD clutch switch installation
• ECM
B)
ASCD brake switch signal is not sent to
ECM for extremely long time while the ve-
hicle is driving.
Vehicle speed
More than 30 km/h (19 mph)
Selector lever
Suitable position
P1572 ASCD BRAKE SWITCH
EC-355
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is DTC detected?
YES
>> Go to
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
1.
Drive the vehicle for at least 5 consecutive seconds under the following conditions.
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.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009947482
1.
CHECK OVERALL FUNCTION-I
With CONSULT
1.
Turn ignition switch ON.
2.
Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT.
3.
Check “BRAKE SW1” indication under the following conditions.
Without CONSULT
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK OVERALL FUNCTION-II
With CONSULT
Select “BRAKE SW2” and check indication in “DATA MONITOR” mode with CONSULT.
Vehicle speed
More than 30 km/h (19 mph)
Selector lever
Suitable position
Driving location
Depress the brake pedal for more
than five seconds so as not to come
off from the above-mentioned vehi-
cle speed.
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)
Slightly depressed
OFF
Fully released
ON
ECM
Condition
Voltage
Connector
+
-
Terminal
Terminal
E16
100
(ASCD brake
switch signal)
108
Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)
Slightly de-
pressed
Approx. 0V
Fully released
Battery voltage
EC-356
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
P1572 ASCD BRAKE SWITCH
Without CONSULT
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> GO TO 11.
3.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ASCD brake switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO-1
>> CVT models: GO TO 4.
NO-2
>> M/T models: GO TO 5.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E105, M77
• 10 A fuse (No. 2)
• Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ASCD clutch switch harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ASCD clutch switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal
Slightly de-
pressed
ON
Fully released
OFF
ECM
Condition
Voltage
Connector
+
-
Terminal
Terminal
E16
99
(Stop lamp
switch signal)
108
Brake pedal
Slightly de-
pressed
Battery voltage
Fully released
Approx. 0V
ASCD brake switch
Ground
Voltage
Connector
Terminal
E112
1
Ground
Battery voltage
ASCD clutch switch
Ground
Voltage
Connector
Terminal
E111
3
Ground
Battery voltage
P1572 ASCD BRAKE SWITCH
EC-357
< DTC/CIRCUIT DIAGNOSIS >
[MR18DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E105, M77
• 10 A fuse (No. 2)
• Harness for open or short between ASCD clutch switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Check the continuity between ASCD clutch switch 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 8.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK ASCD CLUTCH SWITCH
EC-359, "Component Inspection (ASCD Clutch Switch)"
.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Replace ASCD clutch switch. Refer to
.
9.
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 ASCD brake switch harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK ASCD BRAKE SWITCH
EC-358, "Component Inspection (ASCD Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Replace ASCD brake switch. Refer to
.
11.
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.
ASCD clutch switch
ASCD brake switch
Continuity
Connector
Terminal
Connector
Terminal
E111
4
E112
1
Existed
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E112
2
E16
100
Existed
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