Infiniti FX35, FX50 (S51). Manual - part 1604

SCS-1

SUSPENSION

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SECTION 

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CONTENTS

SUSPENSION CONTROL SYSTEM

BASIC INSPECTION  ....................................

3

DIAGNOSIS AND REPAIR WORK FLOW  .........

3

Work Flow  .................................................................

3

SYSTEM DESCRIPTION  ..............................

6

Continuous Damping Control SYSTEM  ...........

6

System Diagram ........................................................

6

System Description  ...................................................

6

Component Parts Location ........................................

8

Component Description .............................................

9

DIAGNOSIS SYSTEM (E-SUS CONTROL 
UNIT) ..................................................................

10

CONSULT-III Function  ............................................

10

DTC/CIRCUIT DIAGNOSIS  .........................

12

C1D01 VEHICLE SPEED SIGNAL  ....................

12

Description ..............................................................

12

DTC Logic  ...............................................................

12

Diagnosis Procedure ...............................................

12

C1D03 STEERING ANGLE SENSOR ................

14

Description ..............................................................

14

DTC Logic  ...............................................................

14

Diagnosis Procedure ...............................................

14

C1D05 TORQUE SIGNAL  ..................................

16

Description ..............................................................

16

DTC Logic  ...............................................................

16

Diagnosis Procedure ...............................................

16

C1D07 STOP LAMP SWITCH ............................

18

Description ..............................................................

18

DTC Logic  ...............................................................

18

Diagnosis Procedure ...............................................

18

C1D09 BRAKE FLUID PRESSURE SIGNAL ....

20

Description ..............................................................

20

DTC Logic  ...............................................................

20

Diagnosis Procedure  ...............................................

20

C1D0B FRONT WHEEL VERTICAL G SEN-
SOR ...................................................................

22

Description ...............................................................

22

DTC Logic ................................................................

22

Diagnosis Procedure  ...............................................

22

C1D0C FRONT WHEEL VERTICAL G SEN-
SOR ...................................................................

24

Description ...............................................................

24

DTC Logic ................................................................

24

Diagnosis Procedure  ...............................................

24

C1D0D FRONT BODY VERTICAL G SEN-
SOR ...................................................................

26

Description ...............................................................

26

DTC Logic ................................................................

26

Diagnosis Procedure  ...............................................

26

C1D10 FRONT BODY VERTICAL G SENSOR 

...

28

Description ...............................................................

28

DTC Logic ................................................................

28

Diagnosis Procedure  ...............................................

28

C1D11 REAR VERTICAL G SENSOR  .............

30

Description ...............................................................

30

DTC Logic ................................................................

30

Diagnosis Procedure  ...............................................

30

C1D12 SHOCK ABSORBER ACTUATOR  .......

32

Description ...............................................................

32

DTC Logic ................................................................

32

Diagnosis Procedure  ...............................................

32

Component Inspection .............................................

33

C1D13 SHOCK ABSORBER ACTUATOR  .......

34

Description ...............................................................

34

DTC Logic ................................................................

34

Diagnosis Procedure  ...............................................

34

Component Inspection .............................................

35

SCS-2

C1D14 SHOCK ABSORBER ACTUATOR  .......

36

Description ..............................................................

36

DTC Logic ...............................................................

36

Diagnosis Procedure  ..............................................

36

Component Inspection ............................................

37

C1D15 SHOCK ABSORBER ACTUATOR  .......

38

Description ..............................................................

38

DTC Logic ...............................................................

38

Diagnosis Procedure  ..............................................

38

Component Inspection ............................................

39

C1D16 E-SUS CONTROL UNIT  ........................

40

Description ..............................................................

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DTC Logic ...............................................................

40

Diagnosis Procedure  ..............................................

40

C1D18 IGN POWER SUPPLY  ...........................

41

Description ..............................................................

41

DTC Logic ...............................................................

41

Diagnosis Procedure  ..............................................

41

C1D23 E-SUS CONTROL UNIT  ........................

43

Description ..............................................................

43

DTC Logic ...............................................................

43

Diagnosis Procedure  ..............................................

43

U1000 CAN COMM CIRCUIT  ............................

44

Description ..............................................................

44

DTC Logic ...............................................................

44

Diagnosis Procedure  ..............................................

44

U1010 CONTROL UNIT (CAN)  .........................

45

Description ..............................................................

45

DTC Logic ...............................................................

45

Diagnosis Procedure  ..............................................

45

MODE SELECT SWITCH (E-SUS MODE SE-
LECT) .................................................................

46

Description ..............................................................

46

Component Function Check  ...................................

46

Diagnosis Procedure  ..............................................

46

Component Inspection ............................................

47

SPORT MODE INDICATOR LAMP  ...................

48

Description ..............................................................

48

Component Function Check  ...................................

48

Diagnosis Procedure  ..............................................

48

ECU DIAGNOSIS INFORMATION .............

49

E-SUS CONTROL UNIT  ....................................

49

Reference Value  .....................................................

49

Wiring Diagram - Continuous Damping Control 
SYSTEM -  ...............................................................

52

Fail-safe ..................................................................

57

DTC Inspection Priority Chart  .................................

58

DTC Index ...............................................................

58

SYMPTOM DIAGNOSIS  ............................

59

SPORT MODE INDICATOR LAMP DOES 
NOT TURN ON  ..................................................

59

Description ..............................................................

59

Diagnosis Procedure ...............................................

59

PRECAUTION ............................................

60

PRECAUTIONS  .................................................

60

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................

60

Precautions for terminology  ....................................

60

Precautions for diagnosis ........................................

60

REMOVAL AND INSTALLATION ..............

61

E-SUS CONTROL UNIT  ....................................

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Exploded View  ........................................................

61

Removal and Installation .........................................

61

FRONT BODY VERTICAL G SENSOR  ............

62

Exploded View  ........................................................

62

Removal and Installation .........................................

62

FRONT WHEEL VERTICAL G SENSOR  ..........

63

Exploded View  ........................................................

63

Removal and Installation .........................................

63

REAR BODY VERTICAL G SENSOR ...............

64

Exploded View  ........................................................

64

Removal and Installation .........................................

64

SHOCK ABSORBER ACTUATOR  ...................

65

Removal and Installation .........................................

65

DIAGNOSIS AND REPAIR WORK FLOW

SCS-3

< BASIC INSPECTION >

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow

INFOID:0000000005236137

OVERALL SEQUENCE

DETAILED FLOW

1.

OBTAIN INFORMATION ABOUT SYMPTOM

Interview the customer to obtain as much information as possible about the conditions and environment under
which the malfunction occurs. 

JSEIA0025GB

SCS-4

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORK FLOW

>> GO TO 2.

2.

CHECK DTC

1.

Check for DTC. 

2.

If a DTC exists, perform the following operations. 

-

Records the DTCs. 

-

Erase DTCs

-

Check that the root cause clarified with DTC matches to the malfunction information described by the cus-
tomer. 

3.

Check also the related service information or others. 

Do malfunction information and or DTC exist?

Malfunction information and DTC exist. >>GO TO 3.
Malfunction information exists but no DTC. >>GO TO 4.
No malfunction information, but DTC exists. >>GO TO 5.

3.

REPRODUCE THE MALFUNCTION INFORMATION

Check the malfunction described by the customer on the vehicle. 
Record the status of each signal when a symptom occurs with “Data Monitor” in CONSULT-III. 
Inspect the relation of the information and the condition when it occurs. 

>> GO TO 5.

4.

CHECK THE MALFUNCTION

Check the malfunction described by the customer on the vehicle.
Record the status of each signal when a symptom occurs with “Data Monitor” in CONSULT-III. 
Inspect the relation of the information and the condition when it occurs. 

>> GO TO 6.

5.

PERFORM “DTC CONFIRMATION PROCEDURE”

Perform the “DTC conformation procedure” to the detected DTC and check that the DTC is detected again. 
Refer to 

SCS-58, "DTC Inspection Priority Chart"

 when multiple DTCs are detected, and then judge the order

for performing the diagnosis. 

Is any DTC detected?

YES

>> GO TO 7.

NO

>> Follow 

GI-6, "How to Follow Test Groups in Trouble Diagnosis"

 to check. 

6.

IDENTIFY MALFUNCTIONING SYSTEM WITH “SYMPTOM DIAGNOSIS”

Use the “Symptom diagnosis” from the symptom inspection result in step 4. Then identify where to start per-
forming the diagnosis based on the possible causes and the symptoms. 

>> GO TO 7.

7.

IDENTIFY MALFUNCTIONING PARTS WITH “COMPONENT DIAGNOSIS”

Perform the inspection with the “component diagnosis” of the applicable system. 
NOTE:
The “component diagnosis” mainly consists of the check for an open circuit. 
The circuit check in the diagnosis procedure also requires the check for a short circuit. Refer to 

GI-39, "Circuit

Inspection"

 for details. 

>> GO TO 8.

8.

REPAIR OR REPLACE THE MALFUNCTIONING PARTS

1.

Repair or replace the part detected as malfunctioning. 

2.

After repairing or replacing, reinstall/reconnect parts or connectors removed/disconnected in the “compo-
nent diagnosis”, and then erase the DTC.