Nissan Frontier. Instruction — part 456
P1572 ASCD BRAKE SWITCH
EC-395
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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Component Inspection
INFOID:0000000009481087
BRAKE PEDAL POSITION SWITCH
1. Turn ignition switch OFF.
2. Disconnect brake pedal position switch harness connector.
3. Check continuity between brake pedal position switch terminals
1 and 2 under the following conditions.
If NG, adjust brake pedal position switch installation, refer to
, and perform step 3 again.
CLUTCH PEDAL POSITION SWITCH
1. Turn ignition switch OFF.
2. Disconnect clutch pedal position switch harness connector.
3. Check continuity between clutch pedal position switch terminals
1 and 2 under the following conditions.
If NG, adjust clutch pedal position switch installation, refer to
7, "On-Vehicle Inspection and Adjustment"
, and perform step 3
again.
STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.
If NG, adjust stop lamp switch installation, refer to
, and perform step 3 again.
Condition
Continuity
Brake pedal: Fully released
Should exist
Brake pedal: Slightly depressed
Should not exist
SEC023D
Condition
Continuity
Clutch pedal: Fully released
Should exist
Clutch pedal: Slightly depressed
Should not exist
SEC024D
Condition
Continuity
Brake pedal: Fully released
Should not exist
Brake pedal: Slightly depressed
Should exist
PBIB2285E
EC-396
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Component Description
INFOID:0000000009481088
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
control. Refer to
for ASCD functions.
On Board Diagnosis Logic
INFOID:0000000009481089
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 UXXXX, first perform the trouble diagnosis for DTC UXXXX.
Refer to
• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
• 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
.
DTC Confirmation Procedure
INFOID:0000000009481090
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
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.
WITH CONSULT
1. Start engine.
2. Drive the vehicle at more than 40 km/h (25MPH).
3. Check DTC.
4. If DTC is detected, go to
.
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000009481091
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-157, "CONSULT Function (TRANSMISSION)"
OK or NG
OK
>> GO TO 2.
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.)
• Harness or connectors
(The combination meter circuit is open or
shorted.)
• Combination meter
• Wheel sensor
• ABS actuator and electric unit (control unit)
• TCM (A/T models)
• ECM
P1574 ASCD VEHICLE SPEED SENSOR
EC-397
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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NG
>> Perform trouble shooting relevant to DTC indicated.
2.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
BRC-29, "CONSULT Function (ABS)"
BRC-147, "CONSULT Function (ABS)"
(TYPE 2).
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK COMBINATION METER
Check combination meter function.
.
>> INSPECTION END
EC-398
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P1715 INPUT SPEED SENSOR
P1715 INPUT SPEED SENSOR
Description
INFOID:0000000009481092
ECM receives input speed sensor signal from TCM through CAN communication line. ECM uses this signal for
engine control.
On Board Diagnosis Logic
INFOID:0000000009481093
NOTE:
• If DTC P1715 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
Refer to
• If DTC P1715 is displayed with DTC P0607 first perform the trouble diagnosis for DTC P0607.
Refer to
• If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer
.
• If DTC P1715 is displayed with DTC P0340, first perform the trouble diagnosis for DTC P0340. Refer
.
• If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
The MIL will not light up for this self-diagnosis.
Diagnosis Procedure
INFOID:0000000009481094
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> Perform trouble shooting relevant to DTC indicated.
2.
REPLACE TCM
Replace TCM. Refer to
TM-288, "Removal and Installation"
>> INSPECTION END
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1715
1715
Input speed sensor
(TCM output)
Input speed sensor signal is different from
the theoretical value calculated by ECM
from output speed sensor signal and engine
rpm signal.
• Harness or connectors
(The CAN communication line is open or
shorted)
• Harness or connectors
(Input speed sensor circuit is open or
shorted)
• TCM
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