Infiniti G37 Coupe. Manual - part 1414

WT-28

< COMPONENT DIAGNOSIS >

C1724, C1725, C1726, C1727 TRANSMITTER (BATT VOLT)

C1724, C1725, C1726, C1727 TRANSMITTER (BATT VOLT)

Description

INFOID:0000000001686975

A sensor -transmitter integrated with a valve is installed on a wheel, and transmits a detected air pressure sig-
nal by radio wave.

DTC Logic

INFOID:0000000001686976

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

VEHICLE DRIVING

With CONSULT-III

Driving at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed
10minutes. Then check all tire pressure with CONSULT-III “DATA MONITOR” within 5 minutes.

Does “DATA MONITOR” displayed the standardized value without turning low tire pressure warning lamp ON?

YES

>> INSPECTION END

NO

>> Go to diagnosis procedure. Refer to 

WT-28, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001686977

1.

CHECK ID REGISTRATION

With CONSULT-III

1.

Perform the ID registration of all transmitters. Refer to 

WT-5, "ID REGISTRATION PROCEDURE : Special

Repair Requirement"

.

2.

Drive at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed for
10 minutes. Then check all tire pressures with CONSULT-III “DATA MONITOR” within 5 minutes.

Can ID registration of all transmitters be completed?

YES

>> GO TO 6.

NO

>> GO TO 2.

2.

CHECK AIR PRESSURE SIGNAL

With CONSULT-III

1.

Start engine.

2.

Select “DATA MONITOR” mode for “AIR PRESSURE MONITOR” with CONSULT-III.

3.

Read out the value of “AIR PRESS FL”, “AIR PRESS FR”, “AIR PRESS RR” and “AIR PRESS RL”.

DTC 

number

Trouble diagnosis name

DTC detecting condition

Possible case

C1724

[BATT VOLT LOW] FL

Battery voltage of front-LH transmitter drops.

• Transmitter malfunction
• Tire pressure receiver 

malfunction

• BCM  malfunction

C1725

[BATT VOLT LOW] FR

Battery voltage of front-RH transmitter drops.

C1726

[BATT VOLT LOW] RR

Battery voltage of rear-RH transmitter drops.

C1727

[BATT VOLT LOW] RL

Battery voltage of rear-LH transmitter drops.

Monitored item

Condition

Display value

AIR PRESS FL

Start engine and drive at 40 km/h (25 MPH) or more for 
several minutes.

Approximately equal to the indication on vehicle in-
formation display.

AIR PRESS FL

AIR PRESS FL

AIR PRESS FL

C1724, C1725, C1726, C1727 TRANSMITTER (BATT VOLT)

WT-29

< COMPONENT DIAGNOSIS >

C

D

F

G

H

I

J

K

L

M

A

B

WT

N

O

P

Are all tire pressures displayed 0 kPa?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

CHECK HARNESS BETWEEN BCM AND TIRE PERSSURE RECEIVER

1.

Turn ignition switch “OFF”.

2.

Disconnect BCM harness connector and tire pressure receiver harness connector.

3.

Check continuity between BCM harness connector and tire pressure receiver harness connector.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK TIRE PRESSURE RECEIVER

Check tire pressure receiver. Refer to 

WT-42, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Check BCM pin terminals for damage or loose connection with harness connector. If any items

are damaged, repair or replace damage parts.

NO

>> Replace the tire pressure receiver.

5.

CHECK ID REGISTRATION

Perform ID registration of all transmitters. Refer to 

WT-5, "ID REGISTRATION PROCEDURE : Special Repair

Requirement"

.

Can ID registration of all transmitters be completed?

YES

>> GO TO 6.

NO

>> GO TO 7 after malfunctioning transmitter replacement.

6.

CHECK TIRE PRESSURE MONITORING SYSTEM

With CONSULT-III

1.

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

2.

Check all tire pressure with CONSULT-III “DATA MONITOR” within 15 minutes after vehicle speed
becomes 17 km/h (11 MPH).

Does “DATA MONITOR” displayed the standardized value without turning low tire pressure warning lamp ON?

YES

>> INSPECTION END

NO

>> Replace BCM. Refer to 

BCS-79, "Removal and Installation"

.

7.

CHECK ID REGISTRATION

With CONSULT-III

1.

Perform ID registration of all transmitters. Refer to 

WT-5, "ID REGISTRATION PROCEDURE : Special

Repair Requirement"

.

2.

Drive at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed for
10 minutes. Then check all tire pressures with CONSULT-III “DATA MONITOR” within 5 minutes.

Monitored item

Condition

Display value

AIR PRESS FL

Start engine and drive at 40 km/h (25 MPH) or more for 
several minutes.

Approximately equal to the indication on vehicle in-
formation display

AIR PRESS FR

AIR PRESS RR

AIR PRESS RL

BCM

Tire pressure receiver

Continuity

Connector

Terminal

Connector

Terminal

M123

137

M101

1

Existed

138

4

139

2

WT-30

< COMPONENT DIAGNOSIS >

C1724, C1725, C1726, C1727 TRANSMITTER (BATT VOLT)

Does “DATA MONITOR” displayed the standardized value without turning low tire pressure warning lamp ON?

YES

>> INSPECTION END

NO

>> GO TO 2.

Special Repair Requirement

INFOID:0000000001686978

1.

CHECK TIRE AIR PRESSURE

Check all tire air pressures. Refer to 

WT-98, "Tire"

.

Does all tire pressure data meet the specification?

YES

>> GO TO 2.

NO

>> Inspect or repair the tires or wheels and adjust the tire pressure to the specification.

2.

PERFORM ID REGISTRATION

Perform ID registration. Refer to 

WT-5, "ID REGISTRATION PROCEDURE : Special Repair Requirement"

.

Can ID registration of all transmitters be completed?

YES

>> END

NO

>> GO TO 1.

C1729 VEHICLE SPEED SIG ERR

WT-31

< COMPONENT DIAGNOSIS >

C

D

F

G

H

I

J

K

L

M

A

B

WT

N

O

P

C1729 VEHICLE SPEED SIG ERR

Description

INFOID:0000000001686979

BCM detects no vehicle speed signal.

DTC Logic

INFOID:0000000001686980

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

VEHICLE DRIVING

With CONSULT-III

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

Does “DATA MONITOR” displayed the standardized value without turning low pressure warning lamp ON?

YES

>> INSPECTION END

NO

>> Go to diagnosis procedure. Refer to 

WT-31, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001686981

1.

CHECK SELF-DIAGNOSTIC RESULTS

With CONSULT-III

1.

On “SELECT DIAG MODE”, select the “SELF-DIAG RESULT” screen.

2.

Check display contents in self-diagnostic results.

Is the “CAN COMM CIRCUIT” displayed in the self-diagnosis display?

YES

>> Perform trouble diagnosis for CAN communication system. Refer to 

LAN-16, "Trouble Diagnosis

Flow Chart"

.

NO

>> Check unified meter and A/C amp. Refer to 

MWI-83, "Reference Value"

.

Special Repair Requirement

INFOID:0000000001686982

1.

CHECK TIRE AIR PRESSURE

Check all tire air pressures. Refer to 

WT-98, "Tire"

.

Does all tire pressure data meet the specification?

YES

>> GO TO 2.

NO

>> Inspect or repair the tires or wheels and adjust the tire pressure to the specification.

2.

PERFORM ID REGISTRATION

Perform ID registration. Refer to 

WT-5, "ID REGISTRATION PROCEDURE : Special Repair Requirement"

.

Can ID registration of all transmitters be completed?

YES

>> END

NO

>> GO TO 1.

DTC 

number

Trouble diagnosis name

DTC detecting condition

Possible case

C1729

VHCL SPEED SIG ERR

Vehicle speed signal error

• CAN communication error
• Unified meter and A/C amp mal-

function
Refer to 

MWI-47, 

"Diagnosis Procedure"

.