Nissan Frontier D40. Instruction — part 528
P1572 ASCD BRAKE SWITCH
EC-803
< COMPONENT DIAGNOSIS >
[VQ40DE]
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2.
Disconnect stop lamp switch harness connector.
3.
Check voltage between stop lamp switch terminal 2 and ground
with CONSULT-III 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 F160
• 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 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 13.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
13.
CHECK STOP LAMP SWITCH
EC-803, "Component Inspection"
OK or NG
OK
>> GO TO 14.
NG
>> Replace stop lamp switch.
14.
CHECK INTERMITTENT INCIDENT
GI-46, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000005273806
ASCD BRAKE SWITCH
BBIA0560E
Voltage: Battery voltage
MBIB1407E
Continuity should exist.
EC-804
< COMPONENT DIAGNOSIS >
[VQ40DE]
P1572 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
, and perform step 3 again.
ASCD CLUTCH SWITCH
1.
Turn ignition switch OFF.
2.
Disconnect ASCD clutch switch harness connector.
3.
Check harness continuity between ASCD clutch switch termi-
nals 1 and 2 under the following conditions.
If NG, adjust ASCD clutch switch installation, refer to
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 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
Clutch pedal: Fully released
Should exist
Clutch pedal: Slightly depressed
Should not exist
SEC024D
Condition
Continuity
When brake pedal: Fully released.
Should not exist.
When brake pedal: Slightly depressed.
Should exist.
PBIB1185E
P1574 ASCD VEHICLE SPEED SENSOR
EC-805
< COMPONENT DIAGNOSIS >
[VQ40DE]
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P1574 ASCD VEHICLE SPEED SENSOR
Component Description
INFOID:0000000005273807
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
On Board Diagnosis Logic
INFOID:0000000005273808
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-757, "On Board Diagnosis Logic"
.
• 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
EC-755, "Component Description"
DTC Confirmation Procedure
INFOID:0000000005273809
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:0000000005273810
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-149, "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
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 (A/T models)
• ECM
EC-806
< COMPONENT DIAGNOSIS >
[VQ40DE]
P1574 ASCD VEHICLE SPEED SENSOR
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK COMBINATION METER FUNCTION
.
>> INSPECTION END
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