Infiniti FX35, FX50 (S51). Manual — part 1782

C1921 ENGINE SPEED SIGNAL

STC-69

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1921 ENGINE SPEED SIGNAL

Description

INFOID:0000000005549707

The engine speed signal is transmitted to RAS control unit via CAN communication.

DTC Logic

INFOID:0000000005549708

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 “C1921” or “RAS warning lamp flickering pattern: 33” detected?

YES

>> Proceed to diagnosis procedure. Refer to

STC-69, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549709

1.

PERFORM ECM SELF-DIAGNOSIS

With CONSULT-III

Perform “ENGINE” self-diagnosis.

Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Is DTC “U1000” or “U1010” detected?

YES

>> Check the error system.

NO

>> GO TO 3.

3.

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 “C1921” or “RAS warning lamp flickering pattern: 33” detected?

YES

>> Replace RAS control unit. Refer to

STC-109, "Removal and Installation"

.

NO

>> GO TO 4.

4.

INFORMATION CHECK

DTC

Display items

Malfunction detected condition

Possible cause

C1921

ENG REV SIGNAL

Malfunction is detected in engine speed signal that is
output from ECM via CAN communication.
(Improper signal is input engine speed.)

• ECM
• CAN communication

line

• RAS control unit

STC-70

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1921 ENGINE SPEED SIGNAL

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

STC-

89, "Reference Value"

.

Is each data the standard value?

YES

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Replace RAS control unit. Refer to

STC-109, "Removal and Installation"

.

Special Repair Requirement

INFOID:0000000005549710

BEFORE REPLACING RAS CONTROL UNIT

• Record the self-diagnosis results (history).

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”.

C1923 STEERING ANGLE SENSOR

STC-71

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1923 STEERING ANGLE SENSOR

Description

INFOID:0000000005549711

Steering angle sensor signal is transmitted from steering angle sensor to RAS control unit via CAN communi-
cation.

DTC Logic

INFOID:0000000005549712

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Drive at 60 km/h (37 MPH) or more for 3 minutes or more.

2.

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Without CONSULT-III

1.

Drive at 60 km/h (37 MPH) or more for 3 minutes or more.

2.

Perform the self-diagnosis. Refer to

STC-38, "Diagnosis Description"

.

Is DTC “C1923” or “RAS warning lamp flickering pattern: 22” detected?

YES

>> Proceed to diagnosis procedure. Refer to

STC-71, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549713

1.

PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

With CONSULT-III

1.

Drive at 60 km/h (37 MPH) or more for 3 minutes or more.

2.

Perform “ABS” self-diagnosis.

Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Is DTC “U1000” or “U1010” detected?

YES

>> Check the error system.

NO

>> GO TO 3.

3.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

1.

Drive at 60 km/h (37 MPH) or more for 3 minutes or more.

2.

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Without CONSULT-III

1.

Drive at 60 km/h (37 MPH) or more for 3 minutes or more.

2.

Perform the self-diagnosis. Refer to

STC-38, "Diagnosis Description"

.

Is DTC “C1923” or “RAS warning lamp flickering pattern: 22” detected?

YES

>> Replace RAS control unit. Refer to

STC-109, "Removal and Installation"

.

DTC

Display items

Malfunction detected condition

Possible cause

C1923

STEERING ANGLE SEN
[NO CHANGE]

Malfunction is detected in steering angle sensor signal
that is output from steering angle sensor via CAN com-
munication.
[Steering angle sensor input signal error is detected
when driving at 60 km/h (37 MPH) or more.]

• Steering angle sensor
• CAN communication

line

• RAS control unit

STC-72

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1923 STEERING ANGLE SENSOR

NO

>> GO TO 4.

4.

INFORMATION CHECK

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

STC-

89, "Reference Value"

.

Is each data the standard value?

YES

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Replace RAS control unit. Refer to

STC-109, "Removal and Installation"

.

Special Repair Requirement

INFOID:0000000005549714

BEFORE REPLACING RAS CONTROL UNIT

• Record the self-diagnosis results (history).

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”.