Infiniti FX35, FX50 (S51). Manual - part 1614

C1D18 IGN POWER SUPPLY

SCS-41

< DTC/CIRCUIT DIAGNOSIS >

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C1D18 IGN POWER SUPPLY

Description

INFOID:0000000005588955

Power supply for E-SUS control unit. 

DTC Logic

INFOID:0000000005588956

DTC DETECTION LOGIC

DTC REPRODUCTION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform “E-SUS” self-diagnosis.

Is DTC “C1D18” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

SCS-41, "Diagnosis Procedure"

. 

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005588957

1.

CHECK E-SUS CONTROL UNIT GROUND

1.

Turn the ignition switch OFF.

2.

Disconnect the E-SUS control unit harness connector. 

3.

Check the continuity between the E-SUS control unit harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning harness or connector. 

2.

CHECK E-SUS CONTROL UNIT POWER SUPPLY CIRCUIT

1.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

2.

Check the voltage between the E-SUS control unit harness connector and ground. 

Is the measured value “9.0 V” or less?

YES

>>

Check the following items, and repair or replace the malfunctioning parts. 

• Open circuit in 10 A fuse (#16)
- Short circuit between the 10 A fuse (#16) connector and E-SUS control unit harness connector

terminal 1, 17 

• Battery or ignition switch

NO

>> GO TO 3.

DTC

Display Item

Malfunction detected condition

Possible causes

C1D18

IGN VOLT

A malfunction is detected in the IGN supply voltage 
to E-SUS control unit. 

• Harness or connector
• E-SUS control unit

E-SUS control unit

—

Continuity

Connector

Terminal

B38

18, 19 

Ground

Existed

E-SUS control unit

—

Voltage

Connector

Terminal

B38

1 

Ground

Battery voltage

17

SCS-42

< DTC/CIRCUIT DIAGNOSIS >

C1D18 IGN POWER SUPPLY

3.

CHECK TERMINAL

Check that there is no malfunction in the pin terminals and connection of the E-SUS control unit harness con-
nector. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the malfunctioning parts. 

4.

CHECK E-SUS CONTROL UNIT SIGNAL

With CONSULT-III

1.

Connect the E-SUS control unit harness connector. 

2.

Start the engine.

CAUTION:

Always hold the vehicle stopped.

3.

Select “DATA MONITOR” of “E-SUS”.

4.

Check the value of “IGN” on “DATA MONITOR” screen. 

Is the value in “DATA MONITOR” “16 V” or more?

YES

>> Perform the diagnosis by symptom for the charging system. Refer to 

CHG-23, "Symptom Table"

. 

NO

>> Replace E-SUS control unit. Refer to 

SCS-61, "Exploded View"

. 

C1D23 E-SUS CONTROL UNIT

SCS-43

< DTC/CIRCUIT DIAGNOSIS >

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C1D23 E-SUS CONTROL UNIT

Description

INFOID:0000000005588958

Performs good/no good judgment of the E-SUS control unit reprogramming. 

DTC Logic

INFOID:0000000005588959

DTC DETECTION LOGIC

DTC REPRODUCTION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform “E-SUS” self-diagnosis.

Is DTC “C1D23” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

SCS-43, "Diagnosis Procedure"

. 

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005588960

1.

PERFORM E-SUS CONTROL UNIT REPROGRAMMING

With CONSULT-III

Reprogram E-SUS control unit. 

Is it completed successfully?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Perform “E-SUS” self-diagnosis.

Is DTC “C1D23” detected?

YES

>> GO TO 3.

NO

>> INSPECTION END

3.

PERFORM E-SUS CONTROL UNIT REPROGRAMMING AGAIN

With CONSULT-III

1.

Reprogram E-SUS control unit. 

2.

Perform “E-SUS” self-diagnosis.

Is DTC “C1D23” detected?

YES

>> Replace E-SUS control unit. Refer to 

SCS-61, "Exploded View"

. 

NO

>> GO TO 4.

4.

ERASE ERROR RECORD

Erase the memory of E-SUS control unit self-diagnosis result (history). 

>> End

DTC

Display Item

Malfunction detected condition

Possible causes

C1D23

C/U REPRO ERROR

A malfunction is detected at E-SUS control unit re-
programming. 

E-SUS control unit

SCS-44

< DTC/CIRCUIT DIAGNOSIS >

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000005588961

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detectability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information communication with less wir-
ing. Each control unit communicates data but selectively reads required data only.

DTC Logic

INFOID:0000000005588962

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform “E-SUS” self-diagnosis.

Is DTC “U1000” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

SCS-44, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005588963

1.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Perform “E-SUS” self-diagnosis.

Is DTC “U1000” detected?

YES

>> CAN specification chart. Refer to 

LAN-29, "CAN System Specification Chart"

.

NO

>> INSPECTION END

DTC

Display item

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

E-SUS control unit is not communicate 
CAN communication signal for 2 sec-
onds or more.

• CAN communication error
• Malfunction of E-SUS control unit