Nissan Pathfinder (2006 year). Manual - part 19

DTC P1731 A/T 1ST ENGINE BRAKING

AT-143

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2006 Pathfinder

DTC P1731 A/T 1ST ENGINE BRAKING

PFP:00000

Description

ECS00EI8

Fail-safe function to prevent sudden decrease in speed by engine brake other than at “1” position.

CONSULT-II Reference Value

ECS00EI9

On Board Diagnosis Logic

ECS00EIA

●

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

ECS00EIB

●

Harness or connectors
(The sensor circuit is open or shorted.)

●

Low coast brake solenoid valve

●

ATF pressure switch 2

DTC Confirmation Procedure

ECS00EIC

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-144, "Diagnostic Procedure"

 .

Item name

Condition 

Display value

ON OFF SOL

Low coast brake engaged. Refer to 

AT-22

 

.

ON

Low coast brake disengaged. Refer to 

AT-22

 

.

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to 

AT-22

 

.

ON

Low coast brake disengaged. Refer to 

AT-22

 

.

OFF

BCIA0030E

AT-144

DTC P1731 A/T 1ST ENGINE BRAKING

2006 Pathfinder

Diagnostic Procedure

ECS00EID

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-173, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

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

Temperature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”.

●

Refer to 

AT-143, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

SCIA4670E

DTC P1752 INPUT CLUTCH SOLENOID VALVE

AT-145

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2006 Pathfinder

DTC P1752 INPUT CLUTCH SOLENOID VALVE

PFP:31940

Description

ECS00EIE

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

ECS00EIF

 On Board Diagnosis Logic

ECS00EIG

●

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

ECS00EIH

●

Harness or connectors
(The solenoid circuit is open or shorted.)

●

Input clutch solenoid valve 

DTC Confirmation Procedure

ECS00EII

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-146, "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-22

 .

0.6 - 0.8 A

Input clutch engaged. Refer to 

AT-22

 .

0 - 0.05 A

BCIA0030E

AT-146

DTC P1752 INPUT CLUTCH SOLENOID VALVE

2006 Pathfinder

Diagnostic Procedure

ECS00EIJ

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-173, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

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-173, "MAIN POWER SUPPLY AND GROUND

CIRCUIT"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”.

●

Refer to 

AT-145, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

SCIA4793E

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION

AT-147

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2006 Pathfinder

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION

PFP:31940

Description

ECS00EIK

●

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

ECS00EIL

On Board Diagnosis Logic

ECS00EIM

●

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

ECS00EIN

●

Harness or connectors
(The solenoid and switch circuits are open or shorted.)

●

Input clutch solenoid valve 

●

ATF pressure switch 3

DTC Confirmation Procedure

ECS00EIO

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-148, "Diagnostic Procedure"

 .

If DTC (P1752) is detected, go to 

AT-146, "Diagnostic Procedure"

 .

If DTC (P1843) is detected, go to 

AT-168, "Diagnostic Procedure"

 .

Item name

Condition 

Display value (Approx.)

I/C SOLENOID

Input clutch disengaged. Refer to 

AT-22

 .

0.6 - 0.8 A

Input clutch engaged. Refer to 

AT-22

 .

0 - 0.05 A

ATF PRES SW 3

Input clutch engaged. Refer to 

AT-22

 

.

ON

Input clutch disengaged. Refer to 

AT-22

 

.

OFF

BCIA0030E

AT-148

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION

2006 Pathfinder

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Diagnostic Procedure

ECS00EIP

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

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

3.

Drive vehicle in “D” position (3rd 

Þ

 4th gear), and confirm the

ON/OFF actuation of “ATF PRES SW 3” and electrical current
value of “I/C SOLENOID”.

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-173, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

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

Temperature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”.

●

Refer to 

AT-147, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

SCIA4795E

DTC P1757 FRONT BRAKE SOLENOID VALVE

AT-149

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2006 Pathfinder

DTC P1757 FRONT BRAKE SOLENOID VALVE

PFP:31940

Description

ECS00EIQ

Front brake 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

ECS00EIR

On Board Diagnosis Logic

ECS00EIS

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1757 FR/B SOLENOID/CIRC” with CONSULT-II or 6th judgement flicker with-
out 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

ECS00EIT

●

Harness or connectors
(The solenoid circuit is open or shorted.)

●

Front brake solenoid valve 

DTC Confirmation Procedure

ECS00EIU

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 (FR/B 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-150, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition 

Display value (Approx.)

FR/B SOLENOID

Front brake engaged. Refer to 

AT-22

 .

0.6 - 0.8 A

Front brake disengaged. Refer to 

AT-22

 .

0 - 0.05 A

BCIA0030E

AT-150

DTC P1757 FRONT BRAKE SOLENOID VALVE

2006 Pathfinder

Diagnostic Procedure

ECS00EIV

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 engine.

4.

Read out the value of “FR/B 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-173, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

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

Temperature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”.

●

Refer to 

AT-149, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

SCIA4793E