Nissan Qashqai J11. Manual — part 340
P1572 BRAKE PEDAL POSITION SWITCH
ECM-337
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
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ECM
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Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace brake pedal position switch. Refer to
BR-17, "Removal and Installation"
(LHD)
(RHD).
Component Inspection (Stop Lamp Switch)
INFOID:0000000010703028
1.
CHECK STOP LAMP SWITCH-1
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check the continuity between stop lamp switch terminals as per the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH-2
1.
Adjust stop lamp switch installation. Refer to
BR-18, "Inspection and Adjustment"
(RHD).
2.
Check the continuity between stop lamp switch terminals as per the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp switch. Refer to
BR-17, "Removal and Installation"
(RHD).
Brake pedal position switch
Condition
Continuity
+
−
Terminal
1
2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
Stop lamp switch
Condition
Continuity
+
−
Terminal
1
2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Stop lamp switch
Condition
Continuity
+
−
Terminal
1
2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
ECM-338
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
DTC Description
INFOID:0000000010703029
The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combina-
tion meter, and the other is from CVT C/U. The ECM uses these signals for ASCD control. Refer to
"AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
for ASCD functions.
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness or connectors (CAN communication line is open or shorted.)
• Combination meter
• Wheel sensor
• ABS actuator and electric unit (control unit)
• ECM
• TCM
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC PRIORITY
If DTC P1574 is displayed with DTC U1001, P0500, P0605 or P0607, first perform the trouble diagnosis for
DTC U1001, P0500, P0605 or P0607.
Is applicable DTC detected?
YES
>> Perform diagnosis of applicable. Refer to
NO
>> GO TO 2.
2.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
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.
>> GO TO 3.
3.
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
>> Proceed to
ECM-339, "Diagnosis Procedure"
.
NO-1
>> To check malfunction symptom before repair: Refer to
GI-41, "Intermittent Incident"
.
NO-2
>> Confirmation after repair: INSPECTION END
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P1574
ASCD VHL SPD SEN
(ASCD vehicle speed sensor)
ECM detects a difference between two vehicle speed signals is out of the
specified range.
P1574 ASCD VEHICLE SPEED SENSOR
ECM-339
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
ECM
N
P
O
Diagnosis Procedure
INFOID:0000000010703030
1.
CHECK DTC PRIORITY
If DTC P1574 is displayed with DTC U1001, P0500, P0605 or P0607, first perform the trouble diagnosis for
DTC U1001, P0500, P0605 or P0607.
Is applicable DTC detected?
YES
>> Perform diagnosis of applicable. Refer to
NO
>> GO TO 2.
2.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Perform trouble shooting relevant to DTC indicated.
3.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Check DTC with ABS actuator and electric unit (control unit). Refer to
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Perform trouble shooting relevant to DTC indicated.
4.
CHECK DTC WITH COMBINATION METER
Check DTC with combination meter. Refer to
MWI-29, "CONSULT Function (METER/M&A)"
>> INSPECTION END
ECM-340
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
P1805 BRAKE SWITCH
P1805 BRAKE SWITCH
DTC Description
INFOID:0000000010703031
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness or connectors (Stop lamp switch circuit is open or shorted.)
• Stop lamp switch
FAIL-SAFE
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range. There-
fore, acceleration will be poor.
DTC CONFIRMATION PROCEDURE
1.
PERFORM COMPONENT FUNCTION CHECK
1.
Turn ignition switch ON.
2.
Fully depress the brake pedal for at least 5 seconds.
3.
Erase the DTC. Refer to
ECM-63, "On Board Diagnosis Function"
.
4.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
ECM-340, "Diagnosis Procedure"
.
NO-1
>> To check malfunction symptom before repair: Refer to
GI-41, "Intermittent Incident"
.
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010703032
1.
CHECK STOP LAMP SWITCH CIRCUIT
1.
Turn ignition switch OFF.
2.
Depress the brake pedal and check the stop lamp when releasing.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH POWER SUPPLY
1.
Disconnect stop lamp switch harness connector.
2.
Check the voltage between stop lamp switch harness connector and ground.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P1805
BRAKE SW/CIRCUIT
(Brake switch circuit)
A stop lamp switch switch signal is not sent to ECM for extremely long time
while the vehicle is driving.
Vehicle condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
Brake pedal
Stop lamp
Fully released
Not illuminated
Slightly depressed
Illuminated
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