Infiniti Q45. Manual - part 905

TROUBLE DIAGNOSIS FOR SYSTEM

WT-29

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TROUBLE DIAGNOSIS FOR SYSTEM

PFP:00000

Power Supply Circuit

NES000D7

LOW TIRE PRESSURE WARNING CONTROL UNIT TERMINALS AND REFERENCE VALUE

Data are reference value and are measured between each terminal and ground.

CAUTION:

When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.

DIAGNOSTIC PROCEDURE

1. 

CHECK POWER SUPPLY

1.

Turn ignition switch “OFF”.

2.

Disconnect low tire pressure warning control unit harness connector.

3.

Check voltage between low tire pressure warning control unit
harness connector (A) terminals and ground.

4.

Turn ignition switch “ON”. (Do not start engine.)

5.

Check voltage between low tire pressure warning control unit
harness connector (A) terminals and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Check the following. If any items are damaged, repair or 

replace damaged parts.

●

10A fuses [No. 1, 6, 21 located in the fuse block (J/B) No.1]. Refer to 

PG-2, "POWER SUPPLY

ROUTING"

 .

●

Harness for short or open between battery and low tire pressure warning control unit harness
connector M84 terminal 1.

●

Harness for short or open between ignition switch and low tire pressure warning control unit
harness connector M84 terminals 2 and 4.

●

Battery and ignition switch. Refer to 

PG-2, "POWER SUPPLY ROUTING"

 .

Terminal

Wire 

color

Item

Condition

Data (Approx.)

1

Y/G

Power supply
(Memory back-up)

Ignition switch: ON

Battery voltage

Ignition switch: OFF

Battery voltage

2

BR/W

Power supply

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

4

L/OR

Power supply

Ignition switch: ACC

Battery voltage

Ignition switch: OFF

0 V

11

B

Ground

Always

0 V

Connector

Terminal

Voltage (Approx.)

M84

1 - Ground

Battery voltage

2 - Ground

0 V

4 - Ground

SEIA0746E

Connector

Terminal

Voltage (Approx.)

M84

1 - Ground

Battery voltage

2 - Ground

4 - Ground

SEIA0747E

WT-30

TROUBLE DIAGNOSIS FOR SYSTEM

2. 

CHECK GROUND CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect low tire pressure warning control unit harness connector.

3.

Check continuity between low tire pressure warning control unit
harness connector (A) M84 terminals 11.

Also check harness for short to power.

OK or NG

OK

>> INSPECTION END

NG

>> Repair open circuit or short to power in harness or con-

nectors.

Continuity should exist.

SEIA0748E

TROUBLE DIAGNOSIS FOR SYSTEM

WT-31

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Transmitter (NO DATA)

NES000DF

●

Check the following if “[NO DATA] FL”, “[NO DATA] FR”, “[NO DATA] RR” or “[NO DATA] RL” is detected in
self-diagnosis results with CONSULT-II or “flickering pattern for 21, 22, 23 or 24” is detected in self-diag-
nosis results without CONSULT-II.

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE

Data are reference value.

DIAGNOSTIC PROCEDURE

1. 

CHECK AIR PRESSURE SIGNAL

 With CONSULT-II

1.

Start engine.

2.

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

3.

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

Are all tire pressures displayed 0 kPa?

YES >> GO 

TO 

2.

NO

>> GO TO 4.

2. 

CHECK ANTENNA CONNECTOR

Check antenna and feeder connector B183 for damage or loose connections.

OK or NG

OK

>> Check low tire pressure warning control unit pin terminals for damage or loose connection with

harness connector. If any items are damaged, repair or replace damaged parts.

NG

>> Repair or replace antenna or feeder connector.

Monitored item

Content

Condition

Display value

AIR PRESS FL [kPa], 

[kg/cm

2

 ] or [psi]

Condition of front LH tire 
air pressure

Just after the engine is started

0 kPa (0 kg/cm

2

 , 0 psi)

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

Approximately equal to 
the indication on tire 
gauge value

AIR PRESS FR [kPa], 

[kg/cm

2

 ] or [psi]

Condition of front RH tire 
air pressure

Just after the engine is started

0 kPa (0 kg/cm

2

 , 0 psi)

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

Approximately equal to 
the indication on tire 
gauge value

AIR PRESS RR [kPa], 

[kg/cm

2

 ] or [psi]

Condition of rear LH tire 
air pressure

Just after the engine is started

0 kPa (0 kg/cm

2

 , 0 psi)

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

Approximately equal to 
the indication on tire 
gauge value

AIR PRESS RL [kPa], 

[kg/cm

2

 ] or [psi]

Condition of rear RH tire 
air pressure

Just after the engine is started

0 kPa (0 kg/cm

2

 , 0 psi)

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

Approximately equal to 
the indication on tire 
gauge value

Monitored item

Condition

Display value

AIR PRESS FL

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

0 kPa

AIR PRESS FR

AIR PRESS RR

AIR PRESS RL

SEIA0749E

WT-32

TROUBLE DIAGNOSIS FOR SYSTEM

3. 

CHECK ID REGISTRATION

Perform the ID registration of all transmitters. Refer to 

WT-24, "ID Registration Procedure"

 .

Can ID registration of all transmitters be completed?

YES

>> GO TO 4.

NO

>> Replace malfunctioning transmitter then GO TO 5.

4. 

CHECK LOW TIRE PRESSURE WARNING SYSTEM

1.

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

2.

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

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

YES

>> INSPECTION END

NO

>> Replace low tire pressure warning control unit.

5. 

CHECK ID REGISTRATION

1.

Perform the ID registration of all transmitters. Refer to 

WT-24, "ID Registration Procedure"

 .

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-II “DATA MONITOR ITEM” within 5 minutes.

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

YES

>> INSPECTION END

NO

>> Perform the self-diagnosis, inspect detected malfunction.