Nissan Pathfinder (2007 year). Manual - part 23

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

AT-155

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2007 Pathfinder

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

PFP:31940

Description

ECS00EJQ

Low coast brake solenoid valve is turned “ON” or “OFF” 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

ECS00EJR

On Board Diagnosis Logic

ECS00EJS

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1772 LC/B SOLENOID/CIRC” with CONSULT-II or 7th judgement flicker with-
out CONSULT-II is detected when TCM detects an improper voltage drop when it tries to operate the sole-
noid valve.

Possible Cause

ECS00EJT

●

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

●

Low coast brake solenoid valve 

DTC Confirmation Procedure

ECS00EJU

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 “ENGINE” with CONSULT-II.

3.

Start engine.

4.

Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
Selector lever: “1” or “2” 
Gear position: “1st” or “2nd” gear (LC/B ON/OFF)

5.

If DTC is detected, go to 

AT-156, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition 

Display value

ON OFF SOL

Low coast brake engaged. Refer to 

AT-21

 

.

ON

Low coast brake disengaged. Refer to 

AT-21

 

.

OFF

BCIA0031E

AT-156

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

2007 Pathfinder

Diagnostic Procedure

ECS00EJV

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Turn ignition switch ON.

2.

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

3.

Start the engine.

4.

Read out the value of “ON OFF SOL” 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-167, "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-227, "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-155, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

SCIA4794E

DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION

AT-157

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2007 Pathfinder

DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION

PFP:31940

Description

ECS00EJW

●

Low coast brake solenoid valve is turned “ON” or “OFF” 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.

●

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

ECS00EJX

On Board Diagnosis Logic

ECS00EJY

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1774 LC/B SOLENOID FNCT” with CONSULT-II or 7th judgement flicker with-
out 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
ATF pressure switch 2 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 2 is irregular
during releasing accelerator pedal. (Other than during shift change)

Possible Cause

ECS00EJZ

●

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

●

Low coast brake solenoid valve 

●

ATF pressure switch 2

DTC Confirmation Procedure

ECS00EK0

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. 
Selector lever: “1” or “2” position 
Gear position: “1st” or “2nd” gear (LC/B ON/OFF)

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 (P1774) is detected, refer to 

AT-158, "Diagnostic Pro-

cedure"

 .

If DTC (P1772) is detected, go to 

AT-156, "Diagnostic Proce-

dure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition 

Display value

ON OFF SOL

Low coast brake engaged. Refer to 

AT-21

 

.

ON

Low coast brake disengaged. Refer to 

AT-21

 

.

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to 

AT-21

 

.

ON

Low coast brake disengaged. Refer to 

AT-21

 

.

OFF

BCIA0031E

AT-158

DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION

2007 Pathfinder

Diagnostic Procedure

ECS00EK1

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” or “2” position (1

1

  or 2

2

 ” gear), and con-

firm the ON/OFF actuation of the “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-167, "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-227, "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-157, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

SCIA4794E

DTC P1841 ATF PRESSURE SWITCH 1

AT-159

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2007 Pathfinder

DTC P1841 ATF PRESSURE SWITCH 1

PFP:25240

Description

ECS00EK2

Fail-safe function to detect front brake clutch solenoid valve condition.

CONSULT-II Reference Value

ECS00EK3

On Board Diagnosis Logic

ECS00EK4

●

This is not an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1841 ATF PRES SW 1/CIRC” with CONSULT-II is detected when TCM detects
that actual gear ratio is normal, and relation between gear position and condition of ATF pressure switch 1
is irregular during depressing accelerator pedal. (Other than during shift change)

Possible Cause

ECS00EK5

●

ATF pressure switch 1

●

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

DTC Confirmation Procedure

ECS00EK6

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 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.

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 (P1841) is detected, go to 

AT-160, "Diagnostic Procedure"

 .

If DTC (P1757) is detected, go to 

AT-144, "Diagnostic Procedure"

 .

Item name

Condition 

Display value

ATF PRES SW 1

Front brake engaged. Refer to 

AT-21

 

.

ON

Front brake disengaged. Refer to 

AT-21

 

.

OFF

BCIA0031E

AT-160

DTC P1841 ATF PRESSURE SWITCH 1

2007 Pathfinder

Diagnostic Procedure

ECS00EK7

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Start engine.

2.

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

3.

Drive vehicle in the “D” position (3rd 

Þ

 4th gear), and confirm

the ON/OFF actuation of the “ATF PRES SW 1”.

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-167, "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-227, "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-160, "Diagnostic Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

PCIA0067E

DTC P1843 ATF PRESSURE SWITCH 3

AT-161

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2007 Pathfinder

DTC P1843 ATF PRESSURE SWITCH 3

PFP:25240

Description

ECS00EK8

Fail-safe function to detect input clutch solenoid valve condition.

CONSULT-II Reference Value

ECS00EK9

On Board Diagnosis Logic

ECS00EKA

●

This is not an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1843 ATF PRES SW 3/CIRC” with CONSULT-II is detected when TCM detects
that actual gear ratio is normal, and relation between gear position and condition of ATF pressure switch 3
is irregular during depressing accelerator pedal. (Other than during shift change)

Possible Cause

ECS00EKB

●

ATF pressure switch 3

●

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

DTC Confirmation Procedure

ECS00EKC

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 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.

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 (P1843) is detected, go to 

AT-162, "Diagnostic Procedure"

 .

If DTC (P1752) is detected, go to 

AT-140, "Diagnostic Procedure"

 .

Item name

Condition 

Display value

ATF PRES SW 3

Input clutch engaged. Refer to 

AT-21

 

.

ON

Input clutch disengaged. Refer to 

AT-21

 

.

OFF

BCIA0031E

AT-162

DTC P1843 ATF PRESSURE SWITCH 3

2007 Pathfinder

Diagnostic Procedure

ECS00EKD

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Start engine.

2.

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

3.

Drive vehicle in the “D” position (3rd 

Þ

 4th gear), and confirm

the ON/OFF actuation of the “ATF PRES SW 3”.

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-167, "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-227, "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-162, "Diagnostic Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

PCIA0067E