Nissan Maxima. Instruction — part 487
EC-432
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1572 ASCD BRAKE SWITCH
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• Junction block connectors E45, E46
• Harness for open or short between ASCD brake switch and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
7.
CHECK ASCD BRAKE SWITCH
EC-433, "Component Inspection (ASCD Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace ASCD brake switch. Refer to
BR-18, "Removal and Installation"
.
8.
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.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E6
• 10 A fuse (No. 7)
• Harness for open or short between stop lamp switch and battery
>> Repair open circuit, short to ground or short to power in harness or connectors.
10.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check the continuity between stop lamp switch harness connector and ECM harness connector.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 12.
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E37
2
E10
110
Existed
Stop lamp switch
Ground
Voltage
Connector
Terminal
E38
3
Ground
Battery voltage
PBIB2102E
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E38
4
E10
106
Existed
P1572 ASCD BRAKE SWITCH
EC-433
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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NO
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E6
• Junction block connectors E44, E45
• Harness for open or short between stop lamp switch and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
12.
CHECK STOP LAMP SWITCH
EC-433, "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace stop lamp switch. Refer to
BR-18, "Removal and Installation"
.
13.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (ASCD Brake Switch)
INFOID:0000000010095130
1.
CHECK ASCD BRAKE SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check the continuity between ASCD brake switch terminals
under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH-II
1. Adjust ASCD brake switch installation. Refer to
BR-18, "Removal and Installation"
2. Check the continuity between ASCD brake switch terminals
under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD brake switch. Refer to
.
Component Inspection (Stop Lamp Switch)
INFOID:0000000010095131
1.
CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released.
Existed
Slightly depressed.
Not existed
SEC023D
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released.
Existed
Slightly depressed.
Not existed
SEC023D
EC-434
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1572 ASCD BRAKE SWITCH
3. Check harness continuity between stop lamp switch terminals
under the following conditions.
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-14, "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
.
Terminals
Condition
Continuity
3 and 4
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
PBIB2103E
Terminals
Condition
Continuity
3 and 4
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
PBIB2103E
P1574 ASCD VEHICLE SPEED SENSOR
EC-435
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000010095132
The ECM receives two vehicle speed signals via the CAN communication line. One is sent from combination
meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD con-
trol. Refer to
for ASCD functions.
DTC Logic
INFOID:0000000010095133
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
.
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
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 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
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010095134
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-36, "Diagnosis Description"
Is the inspection result normal?
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1574
ASCD vehicle speed
sensor
The difference between the 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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