Nissan X-Trail 32. Manual — part 806
P1574 ASCD VEHICLE SPEED SENSOR
EC-353
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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Diagnosis Procedure
INFOID:0000000010775249
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
.
>> INSPECTION END
EC-354
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
P1805 BRAKE SWITCH
P1805 BRAKE SWITCH
DTC Description
INFOID:0000000010775250
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
EC-79, "On Board Diagnosis Function"
.
4.
Check 1st trip DTC.
Is 1st trip 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
Diagnosis Procedure
INFOID:0000000010775251
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
P1805 BRAKE SWITCH
EC-355
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Perform the trouble diagnosis for power supply circuit.
3.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
1.
Disconnect stop lamp switch harness connector.
2.
Disconnect ECM harness connector.
3.
Check the continuity between stop lamp switch harness connector and ECM harness connector.
4.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace malfunctioning part.
4.
CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to
EC-355, "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp switch. Refer to
.
Component Inspection (Stop Lamp Switch)
INFOID:0000000010775252
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-22, "Inspection and Adjustment"
2.
Check the continuity between stop lamp switch terminals as per the following conditions.
+
−
Voltage
Stop lamp switch
Connector
Terminal
CVT models
E115
1
Ground
Battery voltage
M/T models
E120
1
+
−
Continuity
Stop lamp switch
ECM
Connector
Terminal
Connector
Terminal
CVT models
E115
2
E16
115
Existed
M/T models
E120
2
Stop lamp switch
Condition
Continuity
+
−
Terminal
1
2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
EC-356
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
P1805 BRAKE SWITCH
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp switch. Refer to
BR-21, "Removal and Installation"
.
Stop lamp switch
Condition
Continuity
+
−
Terminal
1
2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
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