Nissan Titan A60. Manual — part 432
EC-394
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P1572 ASCD BRAKE SWITCH
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 7.
3.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
4. Check voltage between ASCD brake switch terminal 1 and
ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M4
• 10A fuse
• Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
CONDITION
VOLTAGE
Brake pedal: Fully released
Approximately 0V
Brake pedal: Slightly depressed
Battery voltage
PBIB1537E
BBIA0373E
Voltage: Battery voltage
PBIB0857E
Continuity should exist.
P1572 ASCD BRAKE SWITCH
EC-395
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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6.
CHECK ASCD BRAKE SWITCH
EC-396, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> Replace ASCD brake switch.
7.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check voltage between stop lamp switch terminal 1 and ground
with CONSULT-III or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M60
• 10A fuse
• Harness for open or short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 10.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK STOP LAMP SWITCH
EC-396, "Component Inspection"
OK or NG
OK
>> GO TO 11.
BBIA0373E
Voltage: Battery voltage
WBIA0545E
Continuity should exist.
EC-396
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P1572 ASCD BRAKE SWITCH
NG
>> Replace stop lamp switch.
11.
CHECK INTERMITTENT INCIDENT
GI-36, "How to Check Terminal"
and
GI-39, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000006158865
ASCD BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.
If NG, adjust ASCD brake switch installation, refer to
"Inspection and Adjustment - Standard Pedal"
, and perform step
3 again.
STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals 1
and 2 under the following conditions.
If NG, adjust stop lamp switch installation, refer to
"Inspection and Adjustment - Standard Pedal"
, and perform step
3 again.
Condition
Continuity
Brake pedal: Fully released
Should exist.
Brake pedal: Slightly depressed
Should not exist.
SEC023D
Condition
Continuity
Brake pedal: Fully released
Should not exist.
Brake pedal: Slightly depressed
Should exist.
WBIA0546E
P1574 ASCD VEHICLE SPEED SENSOR
EC-397
< DTC/CIRCUIT DIAGNOSIS >
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P1574 ASCD VEHICLE SPEED SENSOR
Component Description
INFOID:0000000006158866
The ECM receives two vehicle speed signals via 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.
On Board Diagnosis Logic
INFOID:0000000006158867
• This self-diagnosis has the one trip detection logic.
• The MIL will not light up for this self-diagnosis.
NOTE:
• If DTC P1574 is displayed with DTC U0101, U1001, first perform the trouble diagnosis for DTC U0101,
U1001. Refer to
• 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
INFOID:0000000006158868
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
TESTING CONDITION:
Step 3 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.
1. Start engine (VDC switch OFF).
2. Drive the vehicle at more than 40 km/h (25 MPH).
3. Check DTC.
4. If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000006158869
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-34, "OBD-II Diagnostic Trouble Code (DTC)"
OK or NG
OK
>> GO TO 2.
NG
>> Perform trouble shooting relevant to DTC indicated.
2.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition
Possible Cause
P1574
1574
ASCD vehicle speed
sensor
ECM detects a difference 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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