Infiniti G37 Coupe. Manual - part 1238

 

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Infiniti G37 Coupe. Manual - part 1238

 

 

STC-3

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1671 ACTUATOR ADJUSTMENT NOT 
PERFORMED .....................................................

74

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

74

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

74

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

74

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

74

C1672 INCOMPLETE ACTUATOR ADJUST-
MENT ..................................................................

76

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

76

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

76

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

76

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

76

C1684, C1685 4WAS MAIN CONTROL UNIT 
COMMUNICATION .............................................

77

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

77

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

77

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

77

Component Inspection [ABS Actuator and Electric 
Unit (Control Unit)]  ..................................................

79

Component Inspection (Yaw Rate/Side G Sensor) 

....

79

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

80

C1686 4WAS MAIN CONTROL UNIT ................

81

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

81

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

81

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

81

U1000, U1002 4WAS COMMUNICATION 
CIRCUIT .............................................................

82

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

82

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

82

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

82

Component Inspection [ABS Actuator and Electric 
Unit (Control Unit)]  ..................................................

84

Component Inspection (Yaw Rate/Side G Sensor) 

....

84

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

85

U1010 4WAS COMMUNICATION CIRCUIT  ......

86

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

86

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

86

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

86

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

86

C1900, C1901, C1906, C1907, C1927, C1933 
4WAS MAIN CONTROL UNIT  ...........................

87

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

87

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

87

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

87

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

88

C1902, C1903, C1904, C1910, C1913 4WAS 
REAR MOTOR OUTPUT ....................................

89

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

89

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

89

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

89

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

90

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

91

C1905, C1908, C1922, C1925, C1928 4WAS 
MAIN CONTROL UNIT  .....................................

92

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

92

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

92

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

92

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

93

C1909 4WAS MAIN CONTROL UNIT  ..............

94

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

94

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

94

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

94

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

95

C1911, C1912 4WAS REAR MOTOR POWER 
SUPPLY ............................................................

96

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

96

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

96

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

96

Component Inspection (4WAS Rear Motor Relay) ....

99

Component Inspection (Noise Suppressor) ...........

100

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

100

C1914 REAR WHEEL STEERING ANGLE 
SENSOR ..........................................................

101

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

101

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

101

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

101

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

102

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

103

C1915, C1916 REAR WHEEL STEERING AN-
GLE SENSOR  .................................................

104

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

104

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

104

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

104

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

106

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

106

C1917, C1918 REAR WHEEL STEERING AN-
GLE SENSOR  .................................................

107

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

107

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

107

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

107

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

109

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

109

C1919 VEHICLE SPEED SIGNAL ..................

110

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

110

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

110

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

110

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

111

C1920 STEERING ANGLE SEN .....................

112

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

112

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

112

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

112

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

113

C1921 ENGINE SPEED SIGNAL ....................

115

STC-4

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

115

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

115

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

115

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

116

C1923 STEERING ANGLE SEN  .....................

117

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

117

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

117

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

117

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

118

C1924 STEERING ANGLE SEN  .....................

120

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

120

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

120

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

120

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

121

C1926, C1932 STEERING ANGLE SENSOR .

123

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

123

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

123

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

123

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

124

C1930 4WAS FRONT CONTROL UNIT  ..........

126

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

126

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

126

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

126

C1931 4WAS FRONT CONTROL UNIT COM-
MUNICATION ..................................................

127

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

127

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

127

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

127

Component Inspection [ABS Actuator and Electric 
Unit (Control Unit)]  .................................................

129

Component Inspection (Yaw Rate/Side G Sensor) 

..

129

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

130

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

131

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

131

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

131

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

131

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

131

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

132

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

132

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

132

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

132

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

132

POWER SUPPLY AND GROUND CIRCUIT  ...

133

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

133

Diagnosis Procedure (4WAS Front Control Unit) ..

133

Diagnosis Procedure (4WAS Main Control Unit)  ...

134

Component Inspection (4WAS Rear Motor Relay) ..

136

Component Inspection (Noise Suppressor) ...........

137

POWER STEERING SOLENOID VALVE ........

138

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

138

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

138

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

139

4WAS WARNING LAMP  ..................................

140

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

140

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

140

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

141

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

142

4WAS FRONT CONTROL UNIT  ......................

142

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

142

Wiring Diagram - 4WAS SYSTEM - ......................

145

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

151

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

152

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

153

4WAS MAIN CONTROL UNIT  .........................

155

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

155

Wiring Diagram - 4WAS SYSTEM - ......................

157

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

163

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

165

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

166

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

168

4WAS SYMPTOMS  ..........................................

168

Symptom Table .....................................................

168

4WAS WARNING LAMP DOES NOT TURN 
ON .....................................................................

169

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

169

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

169

4WAS WARNING LAMP DOES NOT TURN 
OFF ...................................................................

170

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

170

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

170

STEERING WHEEL MISS ALIGNMENT ..........

171

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

171

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

171

STEERING SYSTEM VIBRATION AND 
NOISE ...............................................................

173

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

173

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

173

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

174

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

174

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

174

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

175

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

175

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

175

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

175

STC-6

< BASIC INSPECTION >

[WITHOUT 4WAS]

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000001666266

DETAILED FLOW

1.

COLLECT THE INFORMATION FROM THE CUSTOMER

It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms, and
understand them fully. Ask customer about his/her complaints carefully. In some cases, it is necessary to
check symptoms by driving vehicle with customer.

CAUTION:

Customers are not professional. It is dangerous to make an easy guess like “maybe the customer
means that...,” or “maybe the customer mentions this symptom”.

>> GO TO 2.

2.

CHECK THE STATUS

1.

Power steering fluid leakage and check the power steering fluid level. Refer to 

ST-10, "Inspection"

.

2.

Check the drive belt tension. Refer to 

EM-12, "Checking"

.

3.

Check the power steering gear for damages, cracks and fluid leakage. Refer to 

ST-10, "Inspection"

.

4.

Check the relief oil pressure. Refer to 

ST-32, "Inspection"

.

>> GO TO 3.

3.

DIAGNOSIS CHART BY SYMPTOM

Perform the diagnosis by symptom. Refer to 

STC-22, "Diagnosis Procedure"

.

>> GO TO 4.

4.

FINAL CHECK

Check the input/output standard values for the power steering control unit.
Are the power steering control unit input/output values within standard ranges respectively?

YES

>> INSPECTION END

NO

>> GO TO 2.

 

 

 

 

 

 

 

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