Infiniti FX35, FX50 (S51). Manual - part 1932

C1750, C1751, C1752, C1753 RECEIVER

WT-31

< DTC/CIRCUIT DIAGNOSIS >

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2.

Use an oscilloscope and check the input signal waveform between the low tire pressure warning control
unit harness connector terminals and ground. Refer to 

WT-45, "Reference Value"

. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK TIRE PRESSURE RECEIVER POWER SUPPLY CIRCUIT

1.

Disconnect the tire pressure receiver harness connector.

2.

Check the voltage between the tire pressure receiver harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected part.

3.

CHECK TIRE PRESSURE RECEIVER GROUND CIRCUIT

1.

Disconnect the low tire pressure warning control unit harness connector and tire pressure receiver har-
ness connector.

2.

Check the continuity between the low tire pressure warning control unit harness connector and tire pres-
sure receiver harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected part.

4.

CHECK FOR CHANGE TO THE TIRE PRESSURE RECEIVER INSTALLATION POSITION. (EXAMPLE:

FRONT LH RECEIVER OK/NG JUDGMENT)

With CONSULT-III

1.

Exchange the front LH tire pressure receiver with the front RH tire pressure receivers.

2.

Perform “AIR PRESSURE MONITOR” self-diagnosis.

Is DTC “C1751” detected?

YES

>> Replace the front RH tire pressure receiver.

NO

>> Perform trouble diagnosis of the low tire pressure warning control unit. Refer to 

WT-32, "Diagno-

sis Procedure"

. 

Connector

Terminal

—

Standard

M96

3

Ground

Stand by status

(Approx. 4.5 V)

4

5

6

OCC3879D

Connector

Terminal

—

Voltage

E53 (Front LH)

1

Ground

7 - 16 V

E19 (Front RH)

B43 (Rear LH)

B251 (Rear RH)

Low tire pressure warning control unit

Tire pressure receiver

Continuity

M96

26

E53 (Front LH)

4

Existed

25

E19 (Front RH)

24

B43 (Rear LH)

23

B251 (Rear RH)

WT-32

< DTC/CIRCUIT DIAGNOSIS >

C1754 LOW TIRE PRESSURE WARNING CONTROL UNIT

C1754 LOW TIRE PRESSURE WARNING CONTROL UNIT

Description

INFOID:0000000005549626

• After the low tire pressure warning control unit (1) receives the tire

pressure signal from the tire pressure receiver, it controls the oper-
ation of the low tire pressure warning lamp and buzzer.

• Performs self-diagnosis of the Tire Pressure Monitoring System

(TPMS). 

DTC Logic

INFOID:0000000005549627

DTC logic

DTC REPRODUCTION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Drive for several minutes at a speed of 40 km/h (25 MPH) or more, then stop the vehicle.

2.

Stop the vehicle and perform “AIR PRESSURE MONITOR” self-diagnosis.

Is DTC “C1754” detected?

YES

>> Perform trouble diagnosis. Refer to 

WT-32, "Diagnosis Procedure"

. 

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549628

1.

CHECK POWER VOLTAGE

1.

Turn the ignition switch OFF.

2.

Disconnect the low tire pressure warning control unit harness connector.

3.

Check the voltage between the harness connectors of the low tire pressure warning control unit and the
ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>>

If the results of any of the following check items are not normal, repair or replace the malfunc-
tioning part.

• 10 A fuse [No. 3 in fuse block (J/B)]
• Harness open circuit or short circuit between the ignition switch and harness connector terminal

15 of the low tire pressure warning control unit.

• Check battery voltage.

2.

CHECK GROUND CIRCUIT

Check the continuity between the low tire pressure warning control unit harness connector and ground.

JSEIA0009ZZ

DTC

Display Item

Malfunction detected condition

Possible causes

C1754

CONT UNIT (EEPROM)

Tire Pressure Monitoring System (TPMS) 
malfunction in the low tire pressure warn-
ing control unit

Low tire pressure warning 
control unit malfunction 

Low tire pressure warning control unit

—

Voltage

Connector

Terminal

M96

15

Ground

Battery voltage

C1754 LOW TIRE PRESSURE WARNING CONTROL UNIT

WT-33

< DTC/CIRCUIT DIAGNOSIS >

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Are the check results normal?

YES

>> GO TO 3.

NO

>> If an open circuit or other damage is detected, malfunctioning part.

3.

CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT AND TIRE PRESSURE RECEIVER CIRCUIT

1.

Check the continuity between the low tire pressure warning control unit harness connector and tire pres-
sure receiver harness connector.

2.

Check the continuity between the low tire pressure warning control unit harness connector and ground.

Low tire pressure warning control unit

—

Continuity

Connector

Terminal

M96

32

Ground

Existed

Low tire pressure warning control unit

Tire pressure receiver

Continuity

Connector

Terminal

Connector

Terminal

M96

6

E53 (Front LH)

3

Existed

22

2

10

1

26

4

5

E19 (Front RH)

3

21

2

9

1

25

4

4

B43 (Rear LH)

3

20

2

8

1

24

4

3

B251 (Rear RH)

3

19

2

7

1

23

4

WT-34

< DTC/CIRCUIT DIAGNOSIS >

C1754 LOW TIRE PRESSURE WARNING CONTROL UNIT

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

PERFORM THE SELF-DIAGNOSIS

With CONSULT-III

1.

Perform transmitter ID registration for all wheels. Refer to 

WT-7, "ID REGISTRATION PROCEDURE :

Transmitter ID Registration Procedure"

. 

2.

Perform “AIR PRESSURE MONITOR” self-diagnosis.

Is DTC “C1754” detected?

YES

>> Replace the low tire pressure warning control unit. 

NO

>> Check for looseness or damage at the harness connector pins of the low tire pressure warning

control unit. Repair or replace if necessary.

Special Repair Requirement

INFOID:0000000005549629

1.

CHECK TIRE PRESSURE

Check the tire pressure of all wheels. Refer to 

WT-80, "Tire Air Pressure"

. 

Does the tire pressure match the specified value?

YES

>> GO TO 2.

NO

>> Check the road wheels and tires. Adjust the tire pressures to the specified values.

2.

REGISTER TRANSMITTER ID

Perform transmitter ID registration. Refer to 

WT-7, "ID REGISTRATION PROCEDURE : Transmitter ID Regis-

tration Procedure"

. 

>> END

Low tire pressure warning control unit

—

Continuity

Connector

Terminal

M96

6

Ground

Not existed

22

10

26

5

21

9

25

4

20

8

24

3

19

7

23