Nissan X-Trail 32. Instruction — part 804
P1568 SIGNAL INVALID
EC-345
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
1.
Replace chassis control module. Refer to
DAS-278, "Removal and Installation"
2.
Perform DTC Confirmation Procedure again.
Is DTC P1568 detected again?
YES
>> Replace ECM. Refer to
EC-430, "Removal and Installation"
NO
>> INSPECTION END
EC-346
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
P1572 ASCD BRAKE SWITCH
P1572 ASCD BRAKE SWITCH
DTC Description
INFOID:0000000010775244
DTC DETECTION LOGIC
NOTE:
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.
POSSIBLE CAUSE
• Harness or connectors
- Stop lamp switch circuit is shorted.
- Brake pedal position switch circuit is shorted.
• Stop lamp switch
• Brake pedal position switch
• Incorrect stop lamp switch installation
• Incorrect brake pedal position switch installation
• ECM
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC PRIORITY
If DTC P1572 is displayed with DTC P0605, perform the trouble diagnosis for DTC P0605.
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.
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.
Will CONSULT be used?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
1.
Start engine.
2.
Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
3.
Press MAIN switch and make sure that CRUISE indicator is displayed in combination meter.
4.
Drive the vehicle for at least 5 consecutive seconds as per the following conditions.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P1572
ASCD BRAKE SW
(ASCD brake switch)
A
When the vehicle speed is above 30 km/h (19 MPH), ON signals from the
stop lamp switch and the brake pedal position switch are sent to the ECM
at the same time.
B
Brake pedal position switch signal is not sent to ECM for extremely long
time while the vehicle is driving.
P1572 ASCD BRAKE SWITCH
EC-347
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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.
5.
Check DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1.
Drive the vehicle and maintain the following condition for at least 5 seconds.
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
>> Proceed to
.
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
NO-2
>> Confirmation after repair: INSPECTION END
5.
PERFORM COMPONENT FUNCTION CHECK
Without CONSULT
NOTE:
Use component function check to check the overall function of Brake pedal position switch and Stop lamp
switch circuit. During this check, a DTC might not be confirmed.
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector terminals as per the following conditions.
Is the inspection result normal?
YES-1 >> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
YES-2 >> Confirmation after repair: INSPECTION END
NO
>> Proceed to
.
Vehicle speed
More than 30 km/h (19 mph)
Selector lever
Except P or N position
Vehicle speed
More than 30 km/h (19 mph)
Selector lever
Except P or N position
Driving condition
Depress the brake pedal for more
than five seconds so as not to come
off from the above-mentioned vehicle
speed.
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E16
115
128
Brake pedal
Slightly depressed
Battery voltage
Fully released
0 V
116
Slightly depressed
0 V
Fully released
Battery voltage
EC-348
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
P1572 ASCD BRAKE SWITCH
Diagnosis Procedure
INFOID:0000000010775245
1.
CHECK DTC PRIORITY
If DTC P1572 is displayed with DTC P0605, perform the trouble diagnosis for DTC P0605.
Is applicable DTC detected?
YES
>> Perform diagnosis of applicable. Refer to
NO
>> GO TO 2.
2.
CHECK BRAKE PEDAL POSITION SWITCH CIRCUIT
With CONSULT
1.
Turn ignition switch ON.
2.
Select “BRAKE SW1” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
3.
Check “BRAKE SW1” indication as per the following conditions.
Without CONSULT
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 4.
3.
CHECK STOP LAMP SWITCH CIRCUIT
With CONSULT
1.
Select “BRAKE SW2” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
2.
Check “BRAKE SW2” indication as per the following conditions.
Without CONSULT
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector terminals as per the following.
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal
Slightly de-
pressed
OFF
Fully re-
leased
ON
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E16
116
128
Brake pedal
Slightly de-
pressed
0 V
Fully released
Battery voltage
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal
Slightly de-
pressed
ON
Fully re-
leased
OFF
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
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