Infiniti QX56 (Z62). Manual - part 1374

C1750, C1751, C1752, C1753 RECEIVER

WT-43

< DTC/CIRCUIT DIAGNOSIS >

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WHEN SIGNAL IS RECEIVED

Is the inspection result normal?

YES

>> Check connector for loose connection and then perform “DTC CONFIRMATION PROCEDURE”

(self-diagnosis) again. Refer to 

WT-42, "DTC Logic"

.

NO

>> GO TO 2.

2.

CHECK TIRE PRESSURE RECEIVER POWER SUPPLY CIRCUIT 

1.

Disconnect the tire pressure receiver harness connector.

2.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

3.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning harness or connector. 

3.

CHECK TIRE PRESSURE RECEIVER GROUND CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect low tire pressure warning control unit harness connector and tire pressure receiver harness
connector.

3.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the malfunctioning harness or connector. 

4.

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

FRONT LH RECEIVER OK/NG JUDGMENT)

NOTE:
Example: Front LH tire pressure receiver OK/NG judgment when DTC “C1750” is detected.

Low tire pressure warning control unit

—

Value (Approx.)

Connector

Terminal

M96

3

Ground

Approx. 4.5 V

4

5

6

OCC3880D

Tire pressure receiver

—

Voltage

Connector

Terminal

E53 (Front LH)

1

Ground

Approx. 9 - 16 V

E19 (Front RH)

B43 (Rear LH)

B212 (Rear RH)

Low tire pressure warning control unit

Tire pressure receiver

Continuity

Connector

Terminal

Connector

Terminal

M96

26

E53 (Front LH)

4

Existed

25

E19 (Front RH)

24

B43 (Rear LH)

23

B212 (Rear RH)

WT-44

< DTC/CIRCUIT DIAGNOSIS >

C1750, C1751, C1752, C1753 RECEIVER

With CONSULT-III

1.

Exchange the positions of the front LH tire pressure receiver and the front RH tire pressure receiver.

2.

Perform “DTC CONFIRMATION PROCEDURE” (self-diagnosis) again. Refer to 

WT-42, "DTC Logic"

.

Is DTC “C1751” detected?

YES

>> Replace the exchanged front RH tire pressure receiver.

NO

>> Check the low tire pressure warning control unit circuit. Refer to 

WT-45, "Diagnosis Procedure"

. 

C1754 LOW TIRE PRESSURE WARNING CONTROL UNIT

WT-45

< DTC/CIRCUIT DIAGNOSIS >

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C1754 LOW TIRE PRESSURE WARNING CONTROL UNIT

DTC Logic

INFOID:0000000006225520

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION

With CONSULT-III

1.

Drive for 3 minutes at a speed of 40 km/h (25 MPH) or more without stopping.

2.

Stop the vehicle.

3.

Perform self-diagnosis for “AIR PRESSURE MONITOR”.

Is DTC “C1754” detected?

YES

>> Proceed to 

WT-45, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006225521

1.

CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Perform the trouble diagnosis for power supply and ground circuit. Refer to 

WT-51, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK TIRE PRESSURE RECEIVER CIRCUIT

1.

Disconnect the tire pressure receiver harness connector.

2.

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

DTC

Display Item

Malfunction detected condition

Possible causes

C1754

CONT UNIT (EEPROM)

Memory (EEPROM) system malfunction is 
detected in the low tire pressure warning 
control unit

Low tire pressure warning con-
trol unit malfunction 

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

B212 (Rear RH)

3

19

2

7

1

23

4

WT-46

< DTC/CIRCUIT DIAGNOSIS >

C1754 LOW TIRE PRESSURE WARNING CONTROL UNIT

3.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning harness or connector.

3.

PERFORM SELF-DIAGNOSIS AGAIN

With CONSULT-III

1.

Check the tire pressure for all wheels and adjust to the specified value. Refer to 

WT-69, "Tire Air Pres-

sure"

.

2.

Perform transmitter ID registration for all wheels. Refer to 

WT-29, "Work Procedure"

. 

3.

Perform “DTC CONFIRMATION PROCEDURE” (self-diagnosis) again. Refer to 

WT-45, "DTC Logic"

.

Is DTC “C1754” detected?

YES

>> Replace the low tire pressure warning control unit. Refer to 

WT-65, "Removal and Installation"

.

NO

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

control unit. Repair or replace if necessary.

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