Nissan Pathfinder (2005 year). Instruction — part 21
DTC P1730 A/T INTERLOCK
AT-139
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2005 Pathfinder
DTC P1730 A/T INTERLOCK
PFP:00000
Description
UCS0034O
●
Fail-safe function to detect interlock conditions.
On Board Diagnosis Logic
UCS0034P
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “P1730 A/T INTERLOCK” with CONSULT-II or 12th judgement flicker without
CONSULT-II is detected when TCM does not receive the proper voltage signal from the sensor and
switch.
●
TCM monitors and compares gear position and conditions of each ATF pressure switch when gear is
steady.
Possible Cause
UCS0034Q
●
Harness or connectors
(The solenoid and switch circuit is open or shorted.)
●
Low coast brake solenoid valve
●
ATF pressure switch 2
DTC Confirmation Procedure
UCS0034R
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch “ON”. (Do not start engine.)
2.
Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Start engine.
4.
Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
Selector lever: “D” position
5.
If DTC is detected, go to
AT-140, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II”.
BCIA0030E
AT-140
DTC P1730 A/T INTERLOCK
2005 Pathfinder
Judgement of A/T Interlock
UCS0034S
When A/T Interlock is judged to be malfunctioning, the vehicle should be fixed in 2nd gear, and should be set
in a condition in which it can travel.
When one of the following fastening patterns is detected, the fail-safe function in correspondence with the indi-
vidual pattern should be performed.
A/T INTERLOCK COUPLING PATTERN TABLE
●
: NG, X: OK
Diagnostic Procedure
UCS003Q7
1.
SELF-DIAGNOSIS
With CONSULT-II
1.
Drive vehicle.
2.
Stop vehicle and turn ignition switch OFF.
3.
Turn ignition switch ON.
4.
Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II.
OK or NG
OK
>> GO TO 2.
NG
>> Check low coast brake solenoid valve circuit and function. Refer to
,
AT-162, "DTC P1774 LOW COAST BRAKE SOLENOID
.
2.
CHECK DTC
Perform “DTC Confirmation Procedure”.
●
Refer to
AT-139, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.
3.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
AT-172, "MAIN POWER SUPPLY AND GROUND CIR-
.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.
Gear position
ATF pressure switch output
Fail-safe
function
Clutch pressure output pattern after fail-safe func-
tion
SW3
(I/C)
SW6
(HLR/
C)
SW5
(D/C)
SW1
(FR/B)
SW2
(LC/B)
I/C
HLR/C
D/C
FR/B
LC/B
L/U
A/T interlock
coupling pat-
tern
3rd
–
X
X
–
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
4th
–
X
X
–
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
5th
X
X
–
X
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
SCIA5304E
DTC P1730 A/T INTERLOCK
AT-141
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2005 Pathfinder
4.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-233, "Control Valve With TCM and A/T Fluid
.
NG
>> Repair or replace damaged parts.
AT-142
DTC P1731 A/T 1ST ENGINE BRAKING
2005 Pathfinder
DTC P1731 A/T 1ST ENGINE BRAKING
PFP:00000
Description
UCS0034U
Fail-safe function to prevent sudden decrease in speed by engine brake other than at “1” position.
CONSULT-II Reference Value
UCS0034V
On Board Diagnosis Logic
UCS0034W
●
This is not an OBD-II self-diagnostic item.
●
Diagnostic trouble code “P1731 A/T 1ST E/BRAKING” with CONSULT-II or 13th judgement flicker without
CONSULT-II is detected under the following conditions.
–
When TCM does not receive the proper voltage signal from the sensor.
–
When TCM monitors each ATF pressure switch and solenoid monitor value, and detects as irregular when
engine brake of 1st gear acts other than at “1” position.
Possible Cause
UCS0034X
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Low coast brake solenoid valve
●
ATF pressure switch 2
DTC Confirmation Procedure
UCS0034Y
NOTE:
If “DTC Confirmation Procedure” has been previously preformed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch “ON”. (Do not start engine.)
2.
Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Start engine.
4.
Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
ENGINE SPEED: 1,200 rpm
Selector lever: “1” position
Gear position: 1st gear
5.
If DTC is detected, go to
AT-143, "Diagnostic Procedure"
.
Item name
Condition
Display value
ON OFF SOL
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
ATF PRES SW 2
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
BCIA0030E
DTC P1731 A/T 1ST ENGINE BRAKING
AT-143
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2005 Pathfinder
Diagnostic Procedure
UCS003Q8
1.
CHECK INPUT SIGNALS
With CONSULT-II
1.
Start the engine.
2.
Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II.
3.
Drive vehicle in the “1” position (1st gear), and confirm the ON/
OFF actuation of “ATF PRES SW 2” and “ON OFF SOL”.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
AT-172, "MAIN POWER SUPPLY AND GROUND CIR-
.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-233, "Control Valve With TCM and A/T Fluid
.
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
●
Refer to
AT-142, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
SCIA4670E
AT-144
DTC P1752 INPUT CLUTCH SOLENOID VALVE
2005 Pathfinder
DTC P1752 INPUT CLUTCH SOLENOID VALVE
PFP:31940
Description
UCS00350
Input clutch solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehicle
speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the
optimum position.
CONSULT-II Reference Value
UCS00351
On Board Diagnosis Logic
UCS00352
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “P1752 I/C SOLENOID/CIRC” with CONSULT-II or 5th judgement flicker without
CONSULT-II is detected under the following conditions.
–
When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–
When TCM detects as irregular by comparing target value with monitor value.
Possible Cause
UCS00353
●
Harness or connectors
(The solenoid circuit is open or shorted.)
●
Input clutch solenoid valve
DTC Confirmation Procedure
UCS00354
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch “ON”. (Do not start engine.)
2.
Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Start engine.
4.
Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
Þ
4th Gear (I/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
5.
If DTC is detected go to
AT-145, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name
Condition
Display value (Approx.)
I/C SOLENOID
Input clutch disengaged. Refer to
.
0.6 - 0.8 A
Input clutch engaged. Refer to
.
0 - 0.05 A
BCIA0030E
DTC P1752 INPUT CLUTCH SOLENOID VALVE
AT-145
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2005 Pathfinder
Diagnostic Procedure
UCS003Q9
1.
CHECK INPUT SIGNAL
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.
3.
Start the engine.
4.
Read out the value of “I/C SOLENOID” while driving.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
AT-172, "MAIN POWER SUPPLY AND GROUND CIR-
.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-172, "MAIN POWER SUPPLY AND GROUND
.
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
●
Refer to
AT-144, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
SCIA4793E
AT-146
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION
2005 Pathfinder
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION
PFP:31940
Description
UCS00356
●
Input clutch solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehi-
cle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be
shifted to the optimum position.
●
This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.
CONSULT-II Reference Value
UCS00357
On Board Diagnosis Logic
UCS00358
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “P1754 I/C SOLENOID FNCTN” with CONSULT-II is detected under the following
conditions.
–
When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
pressure switch 3 is irregular during depressing accelerator pedal. (Other than during shift change)
–
When TCM detects that relation between gear position and condition of ATF pressure switch 3 is irregular
during releasing accelerator pedal. (Other than during shift change)
Possible Cause
UCS00359
●
Harness or connectors
(The solenoid and switch circuits are open or shorted.)
●
Input clutch solenoid valve
●
ATF pressure switch 3
DTC Confirmation Procedure
UCS0035A
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Start engine.
2.
Accelerate vehicle to maintain the following conditions.
ACCELE POSI: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
Þ
4th Gear (I/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
3.
Perform step “2” again.
4.
Turn ignition switch “OFF”, then perform step “1” to “3” again.
5.
Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II. If DTC (P1754) is detected, refer to
AT-147, "Diagnostic Procedure"
.
If DTC (P1752) is detected, go to
AT-145, "Diagnostic Procedure"
.
If DTC (P1843) is detected, go to
AT-167, "Diagnostic Procedure"
.
Item name
Condition
Display value (Approx.)
I/C SOLENOID
Input clutch disengaged. Refer to
.
0.6 - 0.8 A
Input clutch engaged. Refer to
.
0 - 0.05 A
ATF PRES SW 3
Input clutch engaged. Refer to
.
ON
Input clutch disengaged. Refer to
.
OFF
BCIA0030E
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