Nissan Pathfinder. Manual - part 1128

HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP

STC-29

< DTC/CIRCUIT DIAGNOSIS >

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HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP

Component Function Check

INFOID:0000000009177150

1.

CHECK THE ILLUMINATION OF THE HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING

LAMP

Check that the hydraulic pump electric power steering warning lamp turns ON when ignition switch turns ON.

Then, hydraulic pump electric power steering warning lamp turns OFF after the engine is started.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Perform trouble diagnosis. Refer to 

STC-29, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009177151

1.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1. Turn the ignition switch OFF to ON.

2. Perform “EPS” self-diagnosis.
Is any DTC detected?

YES

>>  Check the DTC. Refer to 

STC-13, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP SIGNAL

 With CONSULT

1. Turn the ignition switch ON.

2. Select “WARNING LAMP” in “DATA MONITOR” of “EPS”.

3. Check that the item in “DATA MONITOR” is “On”.

CAUTION:

Engine should not be running for step 3.

4. Start the engine.

CAUTION:

Never drive the vehicle during the test.

5. Check that the item in “DATA MONITOR” is “Off”.
Is the inspection result normal?

YES

>> Perform the trouble diagnosis for combination meter power supply circuit. Refer to 

MWI-59,

"COMBINATION METER : Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

CHECK TERMINALS AND HARNESS CONNECTORS

Check the power steering control module pin terminals for damage or loose connection with harness connec-

tor.
Is the inspection result normal?

YES

>> Power steering control module is malfunctioning. Replace power steering oil pump assembly.

Refer to 

ST-52, "Removal and Installation"

.

NO

>> Repair or replace the malfunctioning component.

STC-30

< SYMPTOM DIAGNOSIS >

HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP DOES 

NOT TURN ON

SYMPTOM DIAGNOSIS

HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP
DOES NOT TURN ON

Description

INFOID:0000000009177152

The hydraulic pump electric power steering warning lamp does not illuminate when the ignition switch is

turned ON (lamp check).

Diagnosis Procedure

INFOID:0000000009177153

1.

CHECK THE HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP

Perform trouble diagnosis for the hydraulic pump electric power steering warning lamp system. Refer to 

STC-

29, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Check that the pin terminals and the connection of each connector are normal.

NO

>> Repair or replace the malfunctioning components.

HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP DOES 

NOT TURN OFF

STC-31

< SYMPTOM DIAGNOSIS >

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HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP
DOES NOT TURN OFF

Description

INFOID:0000000009177154

Hydraulic pump electric power steering warning lamp does not turn OFF several seconds after engine started

Diagnosis Procedure

INFOID:0000000009177155

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform “EPS” self-diagnosis.
Is any DTC detected?

YES

>> Check the DTC. Refer to 

STC-13, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP

Perform the trouble diagnosis of hydraulic pump electric power steering warning lamp. Refer to 

STC-29,

"Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning components.

3.

POWER STEERING CONTROL MODULE POWER SUPPLY AND GROUND CIRCUIT

Perform the trouble diagnosis of power steering control module power supply and ground. Refer to 

STC-22,

"Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Check that the pin terminals and the connection of each connector are normal.

NO

>> Repair or replace the malfunctioning components.

STC-32

< SYMPTOM DIAGNOSIS >

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT

Diagnosis Procedure

INFOID:0000000009177156

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform “EPS” self-diagnosis.
Is a malfunctioning system displayed?

YES

>> Check malfunctioning system. Refer to 

STC-13, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK THE POWER STEERING CONTROL MODULE SIGNAL (1)

With CONSULT

1. Start the engine.

CAUTION:

Never drive the vehicle.

2. Turn the steering wheel until it stops.

3. Select “MTR ASSIST” in “DATA MONITOR” of “EPS”.
Is the display value “100%”?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK THE POWER STEERING CONTROL MODULE SIGNAL (2)

With CONSULT

1. Select “C/U TEMP” and “C/U TEMP A” in “DATA MONITOR” of “EPS”.

2. Stop the system until the DATA MONITOR display value drops to “90

°C (194°F)” or less.

3. Check whether symptom continues.
Did symptom continue?

YES

>> GO TO 4.

NO

>> This occurs because the protection function lowers the assist force. It is not a system malfunction.

Inspection End.

4.

CHECK THE POWER STEERING CONTROL MODULE SIGNAL (3)

With CONSULT

1. Turn the steering wheel to the straight-ahead position. (There is no steering force)

2. Select “BATTERY VOLT” in “DATA MONITOR” of “EPS”.
Is the display value “10.5 V” or more?

YES

>> GO TO 5.

NO

>> Check the battery power system. Refer to 

STC-22, "Diagnosis Procedure"

.

5.

CHECK THE POWER STEERING CONTROL MODULE SIGNAL (4)

With CONSULT

Select “ESTM VHCL SPD” in “DATA MONITOR” of “EPS”.

*: This may not agree with the speedometer indication immediately after the ignition switch is turned ON. This

is not a malfunction.
Is the check result normal?

YES

>> GO TO 6.

NO

>> Check the combination meter, ABS actuator and electric unit (control unit). Refer to 

MWI-19,

"CONSULT Function (METER/M&A)"

 and 

STC-10, "CONSULT Function"

.

Monitor item

Test condition

Display value

ESTM VHCL SPD 

When stopped

0.00 km/h or mph

While driving

Approximately equal to the in-
dication on speedometer

*

(Inside of 

±10%)