Infiniti FX35, FX50 (S51). Manual — part 1776
C1902, C1903, C1904, C1910, C1913 RAS MOTOR OUTPUT
STC-45
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
5.
Check the continuity between RAS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace the harnesses and connectors.
2.
CHECK RAS MOTOR
Check RAS motor. Refer to
STC-46, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace RAS actuator assembly. Refer to
.
3.
PERFORM ACTIVE TEST
With CONSULT-III
1.
Connect RAS control unit harness connector.
2.
Connect RAS motor harness connector.
3.
Perform “SELF DIAGNOSTIC MODE” item on “ACTIVE TEST” of “4WAS(MAIN)/RAS/HICAS”.
CAUTION:
Perform the active test while vehicle is stopped.
4.
Check “MOTOR VOLTAGE”, “MOTOR CURRENT” and “MTR CRNT OPE” while performing the active
test.
Without CONSULT-III
1.
Disconnect RAS control unit harness connector.
2.
Disconnect RAS motor harness connector.
3.
Start the engine.
4.
Check the voltage between RAS control unit harness connector and ground.
RAS control unit
RAS motor
Continuity
Connector
Terminal
Connector
Terminal
B37
38
B54
1
Existed
39
2
RAS control unit
—
Continuity
Connector
Terminal
B37
38
Ground
Not existed
39
Monitor item
Condition
Display value
MOTOR VOLTAGE
Ignition switch: ON
Battery voltage
MOTOR CURRENT
RAS motor running
0 – 20 A
MTR CRNT OPE
RAS actuator neutral condition and vehicle
straight-ahead position
Approx.
−
2 – 2 A
RAS motor running
Approx.
−
20 – 20 A
STC-46
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C1902, C1903, C1904, C1910, C1913 RAS MOTOR OUTPUT
Is the standard value?
YES
>> GO TO 4.
NO
>> Replace RAS actuator assembly. Refer to
4.
PERFORM SELF-DIAGNOSIS
With CONSULT-III
1.
Turn the ignition switch ON.
2.
Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Without CONSULT-III
1.
Connect RAS control unit harness connector.
2.
Connect RAS motor harness connector.
3.
Start the engine.
4.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1902”, “C1903”, “C1904”, “C1910” or “RAS warning lamp flickering pattern:13” detected?
YES
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
.
NO
>> GO TO 5.
5.
CHECK INFORMATION
With CONSULT-III
1.
Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.
2.
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
.
Is each data the standard value?
YES
>> Check each harness connector pin terminal for disconnection.
NO
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
.
Component Inspection
INFOID:0000000005549668
1.
CHECK RAS MOTOR
1.
Turn the ignition switch OFF.
2.
Disconnect RAS motor harness connector.
3.
Check the continuity between RAS motor connector terminals.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace RAS actuator assembly. Refer to
.
Special Repair Requirement
INFOID:0000000005549669
BEFORE REPLACING RAS CONTROL UNIT
• Record the self-diagnosis results (history).
RAS control unit
—
Condition
Voltage (Approx.)
Connector
Terminal
B37
38
Ground
While RAS motor is opera-
tion for right
Battery voltage
While RAS motor is opera-
tion for left
0V
39
While RAS motor is opera-
tion for right
0V
While RAS motor is opera-
tion for left
Battery voltage
RAS motor
Continuity
Terminal
1 – 2
Existed
C1902, C1903, C1904, C1910, C1913 RAS MOTOR OUTPUT
STC-47
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing RAS control unit after
diagnosis.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-
ues of “DATA MONITOR”.
STC-48
< DTC/CIRCUIT DIAGNOSIS >
[WITH REAR ACTIVE STEER]
C1905, C1908, C1922, C1925, C1928 RAS CONTROL UNIT
C1905, C1908, C1922, C1925, C1928 RAS CONTROL UNIT
Description
INFOID:0000000005549670
• RAS actuator and the power steering solenoid valve is controlled by each sensor signal.
• The fail-safe function stops the rear wheel angle function, when the electric components and the mechanical
components are malfunctioning.
• The protective function stops RAS system temporarily when the input signal is not inputted to RAS control
unit (When battery-power dose not work temporarily).
DTC Logic
INFOID:0000000005549671
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Without CONSULT-III
1.
Start the engine.
2.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1905”, “C1908”, “C1922”, “C1925”, “C1928” or “RAS warning lamp flickering pattern:11” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005549672
1.
PERFORM SELF-DIAGNOSIS
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Without CONSULT-III
1.
Start the engine.
2.
Perform the self-diagnosis. Refer to
STC-38, "Diagnosis Description"
.
Is DTC “C1905”, “C1908”, “C1922”, “C1925”, “C1928” or “RAS warning lamp flickering pattern:11” detected?
YES
>> Replace RAS control unit. Refer to
STC-109, "Removal and Installation"
.
NO
>> GO TO 2.
2.
CHECK INFORMATION
With CONSULT-III
1.
Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.
DTC
Display items
Malfunction detected condition
Possible cause
C1905
CONTROL UNIT
[ABNORMAL3]
Malfunction has occurred inside RAS control unit.
• RAS control unit
• Harness or connector
C1908
CONTROL UNIT
[ABNORMAL7]
Malfunction has occurred inside RAS control unit.
• RAS control unit
• Harness or connector
C1922
CONTROL UNIT
[ABNORMAL8]
Malfunction has occurred inside RAS control unit.
• RAS control unit
• Harness or connector
C1925
AD CONVERTER
Malfunction has occurred inside RAS control unit.
• RAS control unit
• Harness or connector
C1928
CONTROL UNIT
[ABNORMAL9]
Malfunction has occurred inside RAS control unit.
• RAS control unit
• Harness or connector
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