Nissan Frontier. Instruction — part 681
P1572 ASCD BRAKE SWITCH
EC-1295
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
NG
>> Replace stop lamp switch. Refer to
.
11.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009481961
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 conditions.
If NG, adjust brake pedal position switch installation, refer to
16, "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 harness 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
When brake pedal: Fully released.
Should exist.
When brake pedal: Slightly depressed.
Should not exist.
SEC023D
Condition
Continuity
When brake pedal: Fully released.
Should not exist.
When brake pedal: Slightly depressed.
Should exist.
PBIB1185E
EC-1296
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Component Description
INFOID:0000000009481962
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:0000000009481963
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
.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
EC-1240, "On Board Diagnosis Logic"
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
DTC Confirmation Procedure
INFOID:0000000009481964
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
EC-1296, "Diagnosis Procedure"
.
Diagnosis Procedure
INFOID:0000000009481965
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
P1574 ASCD VEHICLE SPEED SENSOR
EC-1297
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK COMBINATION METER FUNCTION
.
>> INSPECTION END
EC-1298
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR MEXICO]
P1715 INPUT SPEED SENSOR
P1715 INPUT SPEED SENSOR
Description
INFOID:0000000009481966
ECM receives input speed sensor signal from TCM through CAN communication line. ECM uses this signal for
engine control.
On Board Diagnosis Logic
INFOID:0000000009481967
NOTE:
• If DTC P1715 is displayed with DTC UXXXX first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1715 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
• If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer
EC-1196, "Component Description"
• If DTC P1715 is displayed with DTC P0340, P0345 first perform the trouble diagnosis for DTC P0340,
P0345. Refer to
EC-1200, "Component Description"
.
• If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
The MIL will not illuminates for this diagnosis.
Diagnosis Procedure
INFOID:0000000009481968
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.
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 en-
gine rpm signal.
• Harness or connectors
(The CAN communication line is open or short-
ed)
• Harness or connectors
(Input speed sensor circuit is open or shorted)
• TCM
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