Infiniti G37 Coupe. Manual — part 1237

ST-48

< SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS)

Lower Shaft Sliding Range

INFOID:0000000001666259

Unit: mm (in)

Rack Sliding Force

INFOID:0000000001666260

Unit: N (kg, lb)

Rack Stroke

INFOID:0000000001666261

Unit: mm (in)

Socket Swing Force and Rotating Torque

INFOID:0000000001666262

SWING FORCE

Unit: N (kg, lb)

Automatic Models

Rotating torque

0.49 N·m (0.05 kg-m, 4 in-lb)

Item

Standard

JSGIA0032ZZ

Item

Standard

Sliding range

26.5 (1.043)

Item

Standard

Rack sliding force

195 – 258 (19.9 – 26.3, 43.8 – 57.9)

Item

Standard

Rack neutral position, dimension “L”

69.0 (2.717)

SGIA0629J

Item

Spring balance

Outer socket “P

1

”

4.81 – 45.7 (0.5 – 4.7, 1.1 – 10.3)

SERVICE DATA AND SPECIFICATIONS (SDS)

ST-49

< SERVICE DATA AND SPECIFICATIONS (SDS)

C

D

E

F

H

I

J

K

L

M

A

B

ST

N

O

P

ROTATING TORQUE

Unit: N·m (kg-m, in-lb)

Socket Axial End Play

INFOID:0000000001666263

Unit: mm (in)

Inner Socket Length

INFOID:0000000001666264

Unit: mm (in)

Relief Oil Pressure

INFOID:0000000001666265

Unit: kPa (kg/cm

2

, psi)

Inner socket “P

2

”

8.9 – 64 (0.9 – 6.5, 2.0 – 14.4)

Item

Spring balance

SGIA1540E

Item

Standard

Outer socket

0.3 – 2.9 (0.03 – 0.29, 3 – 25)

Item

Standard

Outer socket

0.5 (0.02) or less

Inner socket

0.2 (0.008) or less

Item

Standard

Rack neutral position, dimension “L”

63.3 (2.49)

SGIA1512E

Item

Standard

Relief oil pressure

8,530 – 9,330 (87 – 95.2, 1,237 – 1,353)

STC-1

STEERING

C

D

E

F

H

I

J

K

L

M

SECTION

STC

A

B

STC

N

O

P

CONTENTS

STEERING CONTROL SYSTEM

WITHOUT 4WAS

BASIC INSPECTION . . . . . . . . .

6

DIAGNOSIS AND REPAIR WORKFLOW . . ..

6

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

6

FUNCTION DIAGNOSIS . . . . . . . ...

7

EPS SYSTEM . . . . . . . . . . . . . ..

7

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

7

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

7

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

9

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

9

COMPONENT DIAGNOSIS . . . . . . .

10

POWER SUPPLY AND GROUND CIRCUIT . ..

10

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

10

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

10

POWER STEERING SOLENOID VALVE . . ..

11

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

11

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

11

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

12

ENGINE SPEED SIGNAL CIRCUIT . . . . ...

13

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

13

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

13

VEHICLE SPEED SIGNAL CIRCUIT . . . . .

15

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

15

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

15

ECU DIAGNOSIS . . . . . . . . . . .

17

POWER STEERING CONTROL UNIT . . . ...

17

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

17

Wiring Diagram - ELECTRONICALLY CON-
TROLLED POWER STEERING SYSTEM - . . .

18

Fail Safe . . . . . . . . . . . . . . . . ..

20

SYMPTOM DIAGNOSIS . . . . . . . ..

22

UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) . . . . . ...

22

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

22

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

22

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

23

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

23

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

23

Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect . . . . . . . . ...

23

ON-VEHICLE REPAIR . . . . . . . . .

24

POWER STEERING CONTROL UNIT . . . ..

24

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

24

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

24

WITH 4WAS

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

25

DIAGNOSIS AND REPAIR WORKFLOW . .

25

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

25

INSPECTION AND ADJUSTMENT . . . . ..

27

ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT . . . . . . . . . . . . . .

27

ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description . . . . . . . . .

27

4WAS FRONT ACTUATOR NEUTRAL POSITION
ADJUSTMENT . . . . . . . . . . . . . . ...

27

4WAS FRONT ACTUATOR NEUTRAL POSI-
TION ADJUSTMENT : Description . . . . . . ..

27

4WAS FRONT ACTUATOR NEUTRAL POSI-
TION ADJUSTMENT : Special Repair Require-
ment (Pattern 1) . . . . . . . . . . . . . ...

27

STC-2

4WAS FRONT ACTUATOR NEUTRAL POSI-
TION ADJUSTMENT : Special Repair Require-
ment (Pattern 2) . . . . . . . . . . . . . ..

28

4WAS FRONT ACTUATOR NEUTRAL POSI-
TION ADJUSTMENT : Special Repair Require-
ment (Pattern 3) . . . . . . . . . . . . . ..

28

4WAS FRONT ACTUATOR NEUTRAL POSI-
TION ADJUSTMENT : Special Repair Require-
ment (Pattern 4) . . . . . . . . . . . . . ..

30

FUNCTION DIAGNOSIS . . . . . . . .

32

4WAS SYSTEM . . . . . . . . . . . . .

32

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

32

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

33

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

35

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

36

EPS SYSTEM . . . . . . . . . . . . .

37

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

37

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

37

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

38

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

38

DIAGNOSIS SYSTEM (4WAS FRONT CON-
TROL UNIT) . . . . . . . . . . . . . ...

39

CONSULT-III Function [4WAS(FRONT)] . . . ....

39

DIAGNOSIS SYSTEM (4WAS MAIN CON-
TROL UNIT) . . . . . . . . . . . . . ...

43

CONSULT-III Function [4WAS(MAIN)/RAS/HI-
CAS] . . . . . . . . . . . . . . . . . ...

43

COMPONENT DIAGNOSIS . . . . . .

47

C1621, C1622 4WAS FRONT ACTUATOR . ..

47

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

47

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

47

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

47

Component Inspection (4WAS Front Motor) . . ..

48

Special Repair Requirement . . . . . . . . ...

49

C1627 4WAS FRONT ACTUATOR . . . . ...

50

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

50

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

50

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

50

Special Repair Requirement . . . . . . . . ...

51

C1628 4WAS FRONT ACTUATOR . . . . ...

52

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

52

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

52

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

52

Component Inspection (Front Wheel Steering An-
gle Sensor) . . . . . . . . . . . . . . . .

53

Special Repair Requirement . . . . . . . . ...

54

C1631, C1632 4WAS FRONT CONTROL
UNIT . . . . . . . . . . . . . . . . ...

55

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

55

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

55

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

55

Special Repair Requirement . . . . . . . . ...

56

C1633 4WAS FRONT CONTROL UNIT . . .

58

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

58

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

58

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

58

Special Repair Requirement . . . . . . . . ...

59

C1651 IGNITION POWER SUPPLY . . . . ..

60

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

60

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

60

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

60

Special Repair Requirement . . . . . . . . ...

61

C1652 4WAS FRONT MOTOR POWER SUP-
PLY . . . . . . . . . . . . . . . . .

62

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

62

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

62

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

62

Special Repair Requirement . . . . . . . . ...

63

C1654 4WAS FRONT ACTUATOR RELAY . .

64

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

64

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

64

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

64

Special Repair Requirement . . . . . . . . ...

65

C1655 4WAS FRONT DRIVER . . . . . . .

66

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

66

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

66

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

66

Special Repair Requirement . . . . . . . . ...

66

C1661 4WAS FRONT LOCK SOLENOID
VALVE . . . . . . . . . . . . . . . ...

68

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

68

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

68

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

68

Component Inspection (4WAS Front Lock Sole-
noid Valve) . . . . . . . . . . . . . . . ..

69

Special Repair Requirement . . . . . . . . ...

69

C1667 LOCK INSERTION . . . . . . . . .

70

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

70

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

70

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

70

Special Repair Requirement . . . . . . . . ...

71

C1668 LOCK HOLDER GAP DETECT . . . .

72

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

72

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

72

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

72

Special Repair Requirement . . . . . . . . ...

72

C1669 INCOMPLETE LOCK RELEASE . . ...

73

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

73

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

73

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

73

Special Repair Requirement . . . . . . . . ...

73