NISSAN TEANA 2014 Service Manual

P1572 ASCD BRAKE SWITCHEC-911
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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P1572 ASCD BRAKE SWITCH
DescriptionINFOID:0000000009462775
When the brake pedal is depressed, brake pedal position 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 EC-574, "AUTOMATIC SPEED CONTROL DE VICE (ASCD) : System Description"
for the ASCD
function.
DTC LogicINFOID:0000000009462776
DTC DETECTION LOGIC
NOTE:
• If DTC P1572 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-883, "DTC Logic"
.
• 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 igniti on switch OFF. And even when ma lfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
DTC CONFIRMATION PROCEDURE
1.INSPECTION START
Do you have CONSULT?
Do you have CONSULT?
YES >> GO TO 2.
NO >> GO TO 5.
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conduc ted, 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 take s 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 3.
3.PERFORM DTC CONFIRMATION PR OCEDURE FOR MALFUNCTION A-I
1. Start engine (VDC switch OFF).
2. Select “DATA MONITOR” mode with CONSULT.
3. Press MAIN switch and make sure that CRUISE lamp lights up.
4. Drive the vehicle for at least 5 consecutive seconds under the following conditions. CAUTION:
Always drive vehicle at a safe speed.
NOTE:
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 brake pedal position switch
are sent to the ECM at the same time. • Harness or connectors
(The stop lamp switch circuit is shorted.)
• Harness or connectors (The brake pedal position switch circuit is
shorted.)
• Stop lamp switch
• Brake pedal position switch
• Incorrect stop lamp switch installation
• Incorrect brake pedal position switch installa- tion
•ECM
B)
Brake pedal position switch signal is not
sent to ECM for extremely long time while
the vehicle is driving.
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EC-912
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P1572 ASCD BRAKE SWITCH
This procedure may be conducted with the drive wheel
s 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 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-913, "Diagnosis Procedure".
NO >> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE A-II
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 wheel s 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 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-913, "Diagnosis Procedure".
NO >> INSPECTION END
5.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to EC-912, "Component Function Check"
.
NOTE:
Use component function check to check the overall function of brake pedal position switch. During this check,
a DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-913, "Diagnosis Procedure"
.
Component Function CheckINFOID:0000000009462777
1.PERFORM COMPONENT FUNCTION CHECK
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connectors.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
VHCL SPEED SE More than 30 km/h (19 mph)
Selector lever Suitable position
VHCL SPEED SE 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 vehicle speed.
ECM
Condition Voltage
Con-
nector +–
Terminal Terminal
E32 126 128 Brake pedal Slightly
depressed Approx. 0 V
Fully re-
leased Battery voltage
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P1572 ASCD BRAKE SWITCHEC-913
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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2.PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connectors.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-913, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000009462778
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 connectors.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK OVERALL FUNCTION-II
With CONSULT
Check “BRAKE SW2” indication in “DATA MONITOR” mode.
Without CONSULT
Check the voltage between ECM harness connectors.
ECM
Condition Voltage
Con-
nector +–
Terminal Terminal
E32 122 128 Brake pedal Slightly
depressed Battery voltage
Fully re-
leased Approx. 0 V
Monitor item Condition Indication
BRAKE SW1 Brake pedal Slightly depressed OFF
Fully released ON
ECM Condition Voltage
Con-
nector +–
Terminal Terminal
E32 126 128 Brake pedal Slightly
depressed Approx. 0 V
Fully re-
leased Battery voltage
Monitor item Condition Indication
BRAKE SW2 Brake pedal Slightly depressed ON
Fully released OFF
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EC-914
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P1572 ASCD BRAKE SWITCH
Is the inspection result normal?
YES >> Check intermittent incident. Refer to
GI-43, "Intermittent Incident".
NO >> GO TO 6.
3.CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect brake pedal position switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between brake pedal pos ition switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between brake pedal posit ion switch harness connector and ECM harness connec-
tor.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK BRAKE PEDAL POSITION SWITCH
Check brake pedal position switch. Refer to EC-916, "Component Inspection (Brake Pedal Position Switch)"
.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-43, "Intermittent Incident".
NO >> Replace brake pedal position switch. Refer to BR-18, "Exploded View"
.
6.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.
ECM
Condition Voltage
Con-
nector +–
Terminal Terminal
E32 122 128 Brake pedal Slightly
depressed Battery voltage
Fully re-
leased Approx. 0 V
Brake pedal position switch
Ground Voltage
Connector Terminal
E51 1 Ground Battery voltage
Brake pedal position switch ECM Continuity
Connector Terminal Connector Terminal
E51 2 E32 126 Existed
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P1572 ASCD BRAKE SWITCHEC-915
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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Is the inspection result normal?
YES >> GO TO 7.
NO >> Perform the trouble diagnosis for power supply circuit.
7.CHECK STOP LAMP SWITCH GROUND CIRCUIT
1. Disconnect stop lamp relay harness connector.
2. Check the continuity between stop lamp switch harness connector and stop lamp relay harness connec-
tor.
3. Also check harness for short to ground and to power.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace error-detected parts.
8.CHECK STOP LAMP SWITCH
Check the stop lamp switch. Refer to EC-916, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace stop lamp switch. Refer to BR-18, "Exploded View"
.
9.CHECK STOP LAMP RELAY GROUND CIRCUIT
1. Check the continuity between stop lamp relay harness connector and ground.
2. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair or replace error-detected parts.
10.CHECK STOP LAMP SWITCH SIGNAL POWER SUPPLY
Check the voltage between stop lamp relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 11.
NO >> Perform the trouble diagnosis for power supply circuit.
+
−Voltag e
Stop lamp switch
Connector Terminal E38 1 Ground Battery voltage
+ −
Continuity
Stop lamp switch Stop lamp relay
Connector Terminal Connector Terminal E38 2 E57 2 Existed
+ −Continuity
St op la mp rel ay
Connector Terminal E57 1 Ground Existed
+ −Voltag e
Stop lamp relay
Connector Terminal E57 5 Ground Battery voltage
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EC-916
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P1572 ASCD BRAKE SWITCH
11 .CHECK STOP LAMP SWITCH SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check the continuity between stop lamp relay harness connector and ECM harness connector.
3. Also check harness for short to ground and to power.
Is the inspection result normal?
YES >> GO TO 12.
NO >> Repair or replace error-detected parts
12.CHECK STOP LAMP RELAY
Check the stop lamp relay. Refer to EC-917, "Component Inspection (Stop Lamp Relay)"
.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-43, "Intermittent Incident".
NO >> Replace stop lamp relay.
Component Inspection (Brake Pedal Position Switch)INFOID:0000000009462779
1.CHECK BRAKE PEDAL POSITION SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect brake pedal position switch harness connector.
3. Check the continuity between brake pedal positi on switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK BRAKE PEDAL POSITION SWITCH-II
1. Adjust brake pedal position switch installation. Refer to BR-13, "Inspection and Adjustment"
.
2. Check the continuity between brake pedal positi on switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace brake pedal position switch. Refer to BR-18, "Exploded View"
.
Component Inspection (Stop Lamp Switch)INFOID:0000000009462780
1.CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals under the following conditions.
+ −
Continuity
Sto p l am p rela y EC M
Connector Terminal Connector Terminal E57 3 E32 122 Existed
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
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P1572 ASCD BRAKE SWITCHEC-917
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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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-13, "Inspection and Adjustment"
.
2. Check harness continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace stop lamp switch. Refer to BR-18, "Exploded View"
.
Component Inspection (Stop Lamp Relay)INFOID:0000000009462781
1.CHECK STOP LAMP RELAY
1. Turn ignition switch OFF.
2. Remove stop lamp relay.
3. Check the continuity between stop lamp relay terminals as per the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace stop lamp relay.
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
Stop lamp relay Condition Continuity
+-
Te r m i n a l
35 12 V direct current supply between terminals
1 and 2 Existed
No current supply Not existed
JMBIA0848ZZ
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EC-918
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P1574 ASCD VEHICL
E SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
DescriptionINFOID:0000000009462782
The ECM receives two vehicle speed signals via CAN communication line. One is sent from combination
meter, and the other is from TCM (Transmission contro l module). The ECM uses these signals for ASCD con-
trol. Refer to EC-574, "AUTOMATIC SPEED CONTROL DE VICE (ASCD) : System Description"
for ASCD
functions.
DTC LogicINFOID:0000000009462783
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, first perform the tr ouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0500, first pe rform the trouble diagnosis for DTC P0500. Refer
to EC-867, "DTC Logic"
.
• If DTC P1574 is displayed with DTC P0605, first pe rform the trouble diagnosis for DTC P0605. Refer
to EC-883, "DTC Logic"
.
• If DTC P1574 is displayed with DTC P0607, first pe rform the trouble diagnosis for DTC P0607. Refer
to EC-884, "DTC Logic"
.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine (VDC switch OFF).
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 wheel s 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 EC-918, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462784
1.CHECK DTC WITH TCM
Check DTC with TCM. Refer to TM-245, "CONSULT Function"
.
DTC No.Trouble diagnosis
name DTC detecting condition Possible cause
P1574 ASCD vehicle speed
sensor The difference the between two vehicle speed
signals is out of the specified range. • Harness or connectors
(The CAN communication line is open or
shorted.)
• Combination meter
• ABS actuator and electric unit (control unit)
• Wheel sensor
•TCM
•ECM
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P1574 ASCD VEHICLE SPEED SENSOREC-919
< DTC/CIRCUIT DIAGNOSIS > [VQ35DE]
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Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform trouble shooting relevant to DTC indicated.
2.CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Check DTC with ABS actuator and elec tric unit (control unit). Refer to BRC-33, "CONSULT Function (ABS)"
.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning part.
3.CHECK COMBINATION METER FUNCTION
Check combination meter function. Refer to MWI-18, "CONSULT Function (METER/M&A)"
.
>> INSPECTION END
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EC-920
< DTC/CIRCUIT DIAGNOSIS >[VQ35DE]
P1800 VIAS CONTROL SOLENOID VALVE 1
P1800 VIAS CONTROL SOLENOID VALVE 1
DTC LogicINFOID:0000000009462792
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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.
TESTING CONDITION:
Before performing the following procedure, confi rm battery voltage is more than 11 V at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-920, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462793
1.CHECK VIAS CONTROL SOLENOID VALVE 1 POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between VIAS control solenoid valve 1 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
2.CHECK VIAS CONTROL SOLENOID VALVE 1 OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between VIAS control so lenoid valve 1 harness connector and ECM harness con-
nector.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1800 VIAS control solenoid valve 1
circuit An excessively low or high voltage signal
is sent to ECM through the VIAS control
solenoid valve 1. • Harness or connectors
(The solenoid valve 1 circuit is open or
shorted.)
• VIAS control solenoid valve 1
VIAS control solenoid valve 1 Ground Voltage
Connector Terminal
F63 1 Ground Battery voltage
VIAS control solenoid valve 1 ECM Continuity
Connector Terminal Connector Terminal
F63 2 F78 39 Existed
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