Nissan Quest E52. Manual - part 1184

C1602 NO TUNING SET

STC-25

< DTC/CIRCUIT DIAGNOSIS >

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2.

Turn ignition switch ON.

CAUTION:

Never start the engine.

3.

Check voltage between power steering control module harness connector terminals and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK POWER STEERING CONTROL MODULE POWER SUPPLY CIRCUIT (2)

1.

Turn ignition switch OFF.

2.

Check the 100A fusible link (#D).

Is the inspection result normal?

YES

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

PG-11, "Wiring Diagram -

BATTERY POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

5.

CHECK POWER STEERING CONTROL MODULE POWER SUPPLY CIRCUIT (3)

1.

Check voltage between power steering control module harness connector terminals and ground.

2.

Turn ignition switch ON.

CAUTION:

Never start the engine.

3.

Check voltage between power steering control module harness connector terminals and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

CHECK POWER STEERING CONTROL MODULE POWER SUPPLY CIRCUIT (4)

1.

Turn ignition switch OFF.

2.

Check the 10A fuse (#3).

3.

Check continuity and short between power steering control module harness connector terminal and fuse
block (J/B) harness connector terminal.

4.

Check continuity between power steering control module harness connector terminal and ground.

Power steering control module

—

Voltage

(Approx.)

Connector

Terminal

E33

1

Ground

8.5 – 18.5 V

Power steering control module

—

Voltage

(Approx.)

Connector

Terminal

E33

1

Ground

8.5 – 18.5 V

Power steering control module

—

Voltage

(Approx.)

Connector

Terminal

E34

5

Ground

0 V

Power steering control module

—

Voltage

(Approx.)

Connector

Terminal

E34

5

Ground

8.5 – 18.5 V

Power steering control module

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

E34

5

E103

4F

Existed

STC-26

< DTC/CIRCUIT DIAGNOSIS >

C1602 NO TUNING SET

Is the inspection result normal?

YES

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

PG-54, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

7.

CHECK SELF-DIAGNOSIS RESULTS

With CONSULT

Perform “EPS” self-diagnosis.

Is DTC “C1602” detected?

YES

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

ST-32, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

Power steering control module

—

Continuity

Connector

Terminal

E34

5

Ground

Not existed

C1606 EPS MOTOR

STC-27

< DTC/CIRCUIT DIAGNOSIS >

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C1606 EPS MOTOR

DTC Logic

INFOID:0000000009650873

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-27, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650874

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-

32, "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-28

< DTC/CIRCUIT DIAGNOSIS >

C1607, C1608 POWER STEERING CONTROL MODULE

C1607, C1608 POWER STEERING CONTROL MODULE

DTC Logic

INFOID:0000000009650875

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-28, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650876

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-32, "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.