Nissan Frontier. Manual — part 574
P1572 ASCD BRAKE SWITCH
EC-867
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
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2. Disconnect brake pedal position switch (1) harness connector.
-
Stop lamp switch (2)
3. Turn ignition switch ON.
4. Check voltage between brake pedal position switch terminal 1 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E160
• 10 A fuse (No.12)
• Harness for open or short between brake pedal position switch and fuse
>> Repair open circuit or short to ground in harness or connectors.
6.
CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between brake pedal position switch terminal 2 and clutch pedal position switch
terminal 1.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK BRAKE PEDAL POSITION SWITCH
EC-868, "Component Inspection"
OK or NG
OK
>> GO TO 14.
NG
>> Replace brake pedal position switch. Refer to
8.
CHECK BRAKE PEDAL POSITION 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 126 and clutch pedal position 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 9.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
MBIB1214E
Voltage: Battery voltage
Continuity should exist.
Continuity should exist.
EC-868
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
P1572 ASCD BRAKE SWITCH
9.
CHECK CLUTCH PEDAL POSITION SWITCH
EC-868, "Component Inspection"
OK or NG
OK
>> GO TO 14.
NG
>> Replace clutch pedal position switch. Refer to
10.
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 or tester.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E160
• 10 A fuse (No.20)
• 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.
12.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 122 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 13.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
13.
CHECK STOP LAMP SWITCH
EC-868, "Component Inspection"
OK or NG
OK
>> GO TO 14.
NG
>> Replace stop lamp switch. Refer to
.
14.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000009481562
BRAKE PEDAL POSITION SWITCH
1. Turn ignition switch OFF.
2. Disconnect brake pedal position switch harness connector.
3. Check harness continuity between brake pedal position switch terminals 1 and 2 under the following con-
ditions.
Voltage: Battery voltage
Continuity should exist.
P1572 ASCD BRAKE SWITCH
EC-869
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
C
D
E
F
G
H
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K
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EC
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P
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If NG, adjust brake pedal position switch installation, refer to
BR-16, "Inspection and Adjustment"
, and per-
form step 3 again.
CLUTCH PEDAL POSITION SWITCH
1. Turn ignition switch OFF.
2. Disconnect clutch pedal position switch harness connector.
3. Check harness continuity between clutch pedal position switch terminals 1 and 2 under the following con-
ditions.
If NG, adjust clutch pedal position switch installation, refer to
CL-7, "On-Vehicle Inspection and Adjust-
, 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
BR-16, "Inspection and Adjustment"
, and perform step
3 again.
Condition
Continuity
When brake pedal: Fully released.
Should exist.
When brake pedal: Slightly depressed.
Should not exist.
Condition
Continuity
Clutch pedal: Fully released
Should exist
Clutch pedal: Slightly depressed
Should not exist
Condition
Continuity
When brake pedal: Fully released.
Should not exist.
When brake pedal: Slightly depressed.
Should exist.
EC-870
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Component Description
INFOID:0000000009481563
The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combina-
tion meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
for ASCD functions.
On Board Diagnosis Logic
INFOID:0000000009481564
This self-diagnosis has the one trip detection logic.
The MIL will not illuminate for this diagnosis.
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
EC-829, "On Board Diagnosis Logic"
.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
EC-814, "On Board Diagnosis Logic"
.
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
EC-827, "On Board Diagnosis Logic"
.
DTC Confirmation Procedure
INFOID:0000000009481565
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 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:
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.
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:0000000009481566
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-155, "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)”
(TYPE 1),
(TYPE 2).
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition
Possible Cause
P1574
1574
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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