Infiniti FX35, FX50 (S51). Manual - part 546

C1210 ECM

DLN-19

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ETX13C]

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C1210 ECM

Description

INFOID:0000000005249051

Transmits the following signals via CAN communication to AWD control unit.     
• Accelerator pedal position signal
• Engine speed signal

DTC Logic

INFOID:0000000005249052

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Start the engine. Drive the vehicle for a while.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “C1210” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-19, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005249053

1.

PERFORM ECM SELF-DIAGNOSIS

With CONSULT-III

Perform self-diagnosis for “ENGINE”.

Is any DTC detected?

YES

>> Check the DTC.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

1.

Erase self-diagnostic results for “ALL MODE AWD/4WD”.

2.

Turn the ignition switch OFF.

3.

Start the engine. Drive the vehicle for a while.

4.

Make sure that malfunction indicator lamp (MIL) turns OFF.

5.

Stop the vehicle. Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “C1210” detected?

YES

>>  Replace AWD control unit. Refer to 

DLN-58, "Exploded View"

.

NO

>> Check AWD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1210

ENGINE SIGNAL 1

Malfunction related to engine signal  has 
been detected.

Malfunction of engine control system

DLN-20

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ETX13C]

P1804 TRANSFER CONTROL UNIT

P1804 TRANSFER CONTROL UNIT

Description

INFOID:0000000005249054

• Controls driving force distribution by signals from each sensor from rear wheel driving mode (0:100) to 4-

wheel driving mode (50:50).

• Rear wheel driving conditions is available by fail-safe function if malfunction is detected in AWD system.

DTC Logic

INFOID:0000000005249055

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch ON.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “P1804” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-20, "Diagnosis Procedure"

.

NO

>> INSPECTION END.

Diagnosis Procedure

INFOID:0000000005249056

1.

REPLACE AWD CONTROL UNIT 

CAUTION:

Replace AWD control unit when self-diagnostic results show items other than this DTC simulta-
neously, too.

>> Replace AWD control unit. Refer 

DLN-58, "Exploded View"

.

DTC

Display item

Malfunction detected condition

Possible cause

P1804

CONTROL UNIT 3

Malfunction has occurred inside AWD 
control unit.

Malfunction is detected in the memory 
(EEPROM) system of transfer control 
unit.

P1809 TRANSFER CONTROL UNIT

DLN-21

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ETX13C]

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P1809 TRANSFER CONTROL UNIT

Description

INFOID:0000000005249057

• Controls driving force distribution by signals from each sensor from rear wheel driving mode (0:100) to 4-

wheel driving mode (50:50).

• Rear wheel driving conditions is available by fail-safe function if malfunction is detected in AWD system.

DTC Logic

INFOID:0000000005249058

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch ON.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “P1809” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-21, "Diagnosis Procedure"

.

NO

>> INSPECTION END.

Diagnosis Procedure

INFOID:0000000005249059

1.

REPLACE AWD CONTROL UNIT 

CAUTION:

Replace AWD control unit when self-diagnostic results show items other than this DTC simulta-
neously, too.

>> Replace AWD control unit. Refer 

DLN-58, "Exploded View"

.

DTC

Display item

Malfunction detected condition

Possible cause

P1809

CONTROL UNIT 4

Malfunction has occurred inside AWD 
control unit.

AD converter system of transfer control 
unit is malfunctioning.

DLN-22

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: ETX13C]

P1826 TRANSFER FLUID TEMPERATURE

P1826 TRANSFER FLUID TEMPERATURE

Description

INFOID:0000000005249060

• Transfer fluid temperature sensor detects the transfer fluid temper-

ature and transmits a signal to AWD control unit.

• The electrical resistance of the sensor decreases as temperature

increases.

DTC Logic

INFOID:0000000005249061

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch ON.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “P1826” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-22, "Diagnosis Procedure"

.

NO

>> INSPECTION END.

Diagnosis Procedure

INFOID:0000000005249062

1.

CHECK TRANSFER FLUID TEMPERATURE SENSOR SIGNAL (1)

1.

Turn the ignition switch OFF.

2.

Disconnect AWD solenoid harness connector.

3.

Turn the ignition switch ON.

4.

Check the voltage between AWD solenoid harness connector terminals.

JSDIA0804GB

JSDIA0805GB

DTC

Display item

Malfunction detected condition

Possible cause

P1826

OIL TEMP SEN

Transfer fluid temperature sensor volt-
age condition is continued 0 V or more 
than 2.45 V for several seconds.

• Malfunction of transfer fluid tempera-

ture sensor or transfer fluid tempera-
ture sensor circuit.

• Malfunction of AWD control unit.