Nissan Pathfinder. Manual - part 1127

C1606 EPS MOTOR

STC-25

< DTC/CIRCUIT DIAGNOSIS >

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C1606 EPS MOTOR

DTC Logic

INFOID:0000000009177142

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and

wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

 With CONSULT

1. Turn the ignition switch OFF to ON.

2. Perform “EPS” self-diagnosis.
Is DTC “C1606” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-25, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009177143

1.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1. Turn the ignition switch OFF to ON.

2. Erase self-diagnostic results for “EPS”.

3. Turn the ignition switch OFF and wait for at least 10 seconds.

4. Perform self-diagnosis for “EPS”.
Is DTC “C1606” detected?

YES

>> Power steering motor is malfunctioning. Replace power steering oil pump assembly. Refer to 

ST-

52, "Removal and Installation"

.

NO

>> Check pin terminal and connection of each harness connector for malfunctioning conditions.

DTC

Display item

Malfunction detected condition

Possible cause

C1606

EPS MOTOR

When the motor driver malfunction of power steer-
ing control module or power steering control mod-
ule motor driver malfunction is detected.

• Harness or connector
• Power steering control motor
• Power steering control mod-

ule

STC-26

< DTC/CIRCUIT DIAGNOSIS >

C1607, C1608 POWER STEERING CONTROL MODULE

C1607, C1608 POWER STEERING CONTROL MODULE

DTC Logic

INFOID:0000000009177144

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and

wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

 With CONSULT

1. Turn the ignition switch OFF to ON.

2. Perform “EPS” self-diagnosis.
Is DTC “C1607” or “C1608” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-26, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009177145

1.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1. Turn the ignition switch OFF to ON.

2. Erase self-diagnostic results for “EPS”.

3. Turn the ignition switch OFF and wait for at least 10 seconds.

4. Perform self-diagnosis for “EPS”.
Is DTC “C1607” or “C1608” detected?

YES

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

Refer to 

ST-52, "Removal and Installation"

.

NO

>> Check pin terminal and connection of each harness connector for malfunctioning conditions.

DTC

Display item

Malfunction detected condition

Possible cause

C1607

EEPROM

When the memory (EEPROM) system malfunction is 
detected in power steering control module.

Power steering control module

C1608

CONTROL UNIT

When the internal malfunction is detected in power 
steering control module.

C160A HEAT PROTECTION

STC-27

< DTC/CIRCUIT DIAGNOSIS >

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C160A HEAT PROTECTION

DTC Logic

INFOID:0000000009177146

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and

wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

 With CONSULT

1. Turn the ignition switch OFF to ON.

2. Perform “EPS” self-diagnosis.
Is DTC “C160A” detected?

YES

>> Go to 

STC-18, "Work Flow"

.

NO

>> Inspection End.

DTC

Display item

Malfunction detected condition

Possible cause

C160A

HEAT PROTECTION

When the steering wheel is operated excessively 
and the interior temperature of the power steering 
system reaches 118

°C (244.4°F) or more. (Protec-

tion function)
NOTE:
Although the hydraulic pump electric power steering 
system warning lamp turns ON, this is not a system 
malfunction. The state returns to normal after stop-
ping steering operation and waiting until the system 
interior temperature drops to 90

°C (194°F) or less.

The protection of the hydraulic 
pump electric power steering sys-
tem

STC-28

< DTC/CIRCUIT DIAGNOSIS >

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000009177147

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.

Each control unit communicate data but selectively reads required data only.

DTC Logic

INFOID:0000000009177148

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and

wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

 With CONSULT

1. Turn the ignition switch OFF to ON.

2. Perform “EPS” self-diagnosis.
Is DTC “U1000” detected?

YES

>> Go to 

STC-28, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009177149

Proceed to 

LAN-20, "Trouble Diagnosis Flow Chart"

.

DTC

Display item

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

Power steering control module is not transmitting/re-
ceiving CAN communication signal for 2 seconds or 
more.

CAN communication error