Nissan Xterra. Instruction — part 320
EC-406
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Component Description
INFOID:0000000009484145
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:0000000009484146
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-365, "On Board Diagnosis Logic"
.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
EC-350, "On Board Diagnosis Logic"
.
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
EC-363, "On Board Diagnosis Logic"
.
DTC Confirmation Procedure
INFOID:0000000009484147
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:0000000009484148
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-101, "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 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-407
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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EC
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OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK COMBINATION METER FUNCTION
.
>> INSPECTION END
EC-408
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P1715 INPUT SPEED SENSOR
P1715 INPUT SPEED SENSOR
Description
INFOID:0000000009484149
ECM receives input speed sensor signal from TCM through CAN communication line. ECM uses this signal for
engine control.
On Board Diagnosis Logic
INFOID:0000000009484150
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
.
• If DTC P1715 is displayed with DTC P0340, P0345 first perform the trouble diagnosis for DTC P0340,
P0345. Refer to
• 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:0000000009484151
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-101, "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-234, "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
P1800 VIAS CONTROL SOLENOID VALVE 1
EC-409
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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EC
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P
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P1800 VIAS CONTROL SOLENOID VALVE 1
Component Description
INFOID:0000000009484152
The VIAS control solenoid valve (2) cuts the intake manifold vacuum
signal for power valve control. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and sends the vacuum signal to the
power valve actuator (1).
On Board Diagnosis Logic
INFOID:0000000009484153
The MIL will not illuminate for this self-diagnosis.
DTC Confirmation Procedure
INFOID:0000000009484154
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:
Before performing the following procedure, confirm that battery voltage is between 11V at idle.
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009484155
1.
CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve harness connector.
3. Turn ignition switch ON.
4. Check voltage between terminal 1 and ground with CONSULT
or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
: Front
AWBIA0684ZZ
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1800
1800
VIAS control solenoid valve cir-
cuit
An excessively low or high voltage signal
is sent to ECM through the valve
• Harness or connectors
(The solenoid valve circuit is open or
shorted.)
• VIAS control solenoid valve
1
: Power valve actuator
2
: VIAS control solenoid valve
: Front
Voltage: Battery voltage
AWBIA0684ZZ
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