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Nissan Pathfinder (2005 year). Manual - part 21

DTC P1730 A/T INTERLOCK

AT-139

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

Turn ignition switch “ON”. (Do not start engine.)

Select “DATA MONITOR” mode for “A/T” with CONSULT-II.

Start engine.

Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
Selector lever: “D” position

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

SELF-DIAGNOSIS

With CONSULT-II

Drive vehicle.

Stop vehicle and turn ignition switch OFF.

Turn ignition switch ON.

Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II.

OK or NG

>> GO TO 2.

>> Check low coast brake solenoid valve circuit and function. Refer to

AT-160, "DTC P1772 LOW

COAST BRAKE SOLENOID VALVE"

AT-162, "DTC P1774 LOW COAST BRAKE SOLENOID

VALVE FUNCTION"

CHECK DTC

Perform “DTC Confirmation Procedure”.

●

Refer to

AT-139, "DTC Confirmation Procedure"

OK or NG

>> INSPECTION END

>> GO TO 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-

CUIT"

OK or NG

>> GO TO 4.

>> 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/

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

–

●

Held in

2nd gear

OFF

4th

–

●

Held in

2nd gear

OFF

5th

–

●

Held in

2nd gear

OFF

SCIA5304E

DTC P1730 A/T INTERLOCK

AT-141

2005 Pathfinder

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

>> Replace the control valve with TCM. Refer to

AT-233, "Control Valve With TCM and A/T Fluid

Temperature Sensor 2"

>> 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

Turn ignition switch “ON”. (Do not start engine.)

Select “DATA MONITOR” mode for “A/T” with CONSULT-II.

Start engine.

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

If DTC is detected, go to

AT-143, "Diagnostic Procedure"

Item name

Condition

Display value

ON OFF SOL

Low coast brake engaged. Refer to

AT-19

Low coast brake disengaged. Refer to

AT-19

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to

AT-19

Low coast brake disengaged. Refer to

AT-19

OFF

BCIA0030E

DTC P1731 A/T 1ST ENGINE BRAKING

AT-143

2005 Pathfinder

Diagnostic Procedure

UCS003Q8

CHECK INPUT SIGNALS

With CONSULT-II

Start the engine.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II.

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

>> GO TO 4.

>> GO TO 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-

CUIT"

OK or NG

>> GO TO 3.

>> Repair or replace damaged parts.

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

>> Replace the control valve with TCM. Refer to

AT-233, "Control Valve With TCM and A/T Fluid

Temperature Sensor 2"

>> Repair or replace damaged parts.

CHECK DTC

Perform “DTC Confirmation Procedure”.

●

Refer to

AT-142, "DTC Confirmation Procedure"

OK or NG

>> INSPECTION END

>> 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.

WITH CONSULT-II

Turn ignition switch “ON”. (Do not start engine.)

Select “DATA MONITOR” mode for “A/T” with CONSULT-II.

Start engine.

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

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.

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

AT-19

0.6 - 0.8 A

Input clutch engaged. Refer to

AT-19

0 - 0.05 A

BCIA0030E

DTC P1752 INPUT CLUTCH SOLENOID VALVE

AT-145

2005 Pathfinder

Diagnostic Procedure

UCS003Q9

CHECK INPUT SIGNAL

With CONSULT-II

Turn ignition switch ON.

Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.

Start the engine.

Read out the value of “I/C SOLENOID” while driving.

OK or NG

>> GO TO 4.

>> GO TO 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-

CUIT"

OK or NG

>> GO TO 3.

>> Repair or replace damaged parts.

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

>> Replace the control valve with TCM. Refer to

AT-172, "MAIN POWER SUPPLY AND GROUND

CIRCUIT"

>> Repair or replace damaged parts.

CHECK DTC

Perform “DTC Confirmation Procedure”.

●

Refer to

AT-144, "DTC Confirmation Procedure"

OK or NG

>> INSPECTION END

>> 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.