Infiniti Q45. Manual - part 907

TROUBLE DIAGNOSIS FOR SYSTEM

WT-37

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DIAGNOSTIC PROCEDURE

1. 

CHECK VEHICLE SPEED SENSOR

 With CONSULT-II

1.

Start engine.

2.

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

3.

Read out the value of “VHCL SPEED SE”.

 Without CONSULT-II

1.

Start engine.

2.

Check signal between low tire pressure warning control unit har-
ness connector (A) terminal and ground with oscilloscope.

OK or NG

OK >> GO 

TO 

4.

NG

>> GO TO 2.

2. 

CHECK COMBINATION METER

1.

Turn ignition switch “OFF”.

2.

Disconnect low tire pressure warning control unit harness connector.

3.

Check signal between combination meter harness connector (A)
terminal and ground with oscilloscope.

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

OK or NG

OK

>> GO TO 3.

NG

>> Check combination meter. Refer to 

DI-16, "Trouble Diagnosis"

 .

Condition

Display value

Vehicle stopped

0 km/h (0 MPH)

Vehicle running

CAUTION:

Check air pressure of tire under standard condition.

Approximately equal to 
the indication on speed-
ometer (Inside of 

±

10%)

SGIA1404E

Connector

Terminal

Condition

Data (Approx.)

M84

 10 - 

Ground

Vehicle speed:
40 km/h (25 MPH)

SEIA0763E

ELF1080D

Connector

Terminal

Condition

Data (Approx.)

M41

 17 - 

Ground

Vehicle speed:
40 km/h (25 MPH)

SEIA0764E

ELF1080D

WT-38

TROUBLE DIAGNOSIS FOR SYSTEM

3. 

CHECK HARNESS BETWEEN LOW TIRE PRESSURE WARNING CONTROL UNIT AND COMBINA-

TION METER

1.

Turn ignition switch “OFF”.

2.

Disconnect low tire pressure warning control unit harness connector and the combination meter harness
connector.

3.

Check continuity between low tire pressure warning control unit
harness connector (A) M84 terminal 10 and combination meter
harness connector (B) M41 terminal 17.

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

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4. 

CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT

Check low tire pressure warning control unit input/output signal. Refer to 

WT-17, "Low Tire Pressure Warning

Control Unit Input/Output Signal Reference Values"

 .

OK or NG

OK

>> GO TO 5.

NG

>> 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.

5. 

CHECK DTC

Perform the self-diagnosis, after driving a vehicle for a while.

OK or NG

OK

>> INSPECTION END

NG

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

WT-49, "Removal and Installation"

 .

Continuity should exist.

SEIA0765E

TROUBLE DIAGNOSIS FOR SYSTEM

WT-39

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Component Inspection

NES000HK

COMBINATION FLASHER UNIT

1.

Turn ignition switch “OFF”.

2.

Remove combination flasher unit. Refer to 

WT-50, "REMOVAL"

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3.

Check resistance between the following terminals.

●

Combination flasher unit connector (A) terminals 1 and 7.

●

Combination flasher unit connector (A) terminals 4 and 6.

4.

Apply 12 V direct current to combination flasher unit connector
(A) terminals 1 and 4 (positive), and to terminals 6 and 7 (nega-
tive).

5.

Check voltege between combination flasher unit connector (A)
terminals 3, 8 (positive) and battery (negative).

6.

If NG, replace combination flasher unit.

Terminal

Resistance (Approx.)

1 – 7

89 k

Ω

4 – 6

78 

Ω

SEIA0785E

Terminal

Condition

Voltege 

(Approx.)

3 (positive) – battery (negative)

With terminal 6 connected with 
negative terminal of battery.

6 V

Without terminal 6 connected with 
negative terminal of battery.

0 V

8 (positive) – battery (negative)

With terminal 6 connected with 
negative terminal of battery.

6 V

Without terminal 6 connected with 
negative terminal of battery.

0 V

SEIA0786E

WT-40

TROUBLE DIAGNOSIS FOR SYMPTOMS

TROUBLE DIAGNOSIS FOR SYMPTOMS

PFP:00007

Low Tire Pressure Warning Lamp Does Not Turn ON for Approx.1 Second When 
Ignition Switch Is Turned ON

NES0007H

DIAGNOSTIC PROCEDURE

1. 

CHECK COMBINATION METER POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect combination meter harness connector.

3.

Check voltage between combination meter harness connector
(A) terminal and ground.

4.

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

5.

Check voltage between combination meter harness connector
(A) terminal and ground.

OK or NG

OK >> GO 

TO 

2.

NG

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

replace damaged parts.

●

10A fuse [No. 6, 9, located in the fuse block (J/B) No.1]. Refer to 

PG-2, "POWER SUPPLY

ROUTING"

 .

●

Harness for short or open between battery and combination meter harness connector M43 ter-
minal 57.

●

Harness for short or open between ignition switch and combination meter harness connector
M43 terminal 59.

●

Ignition switch. Refer to 

PG-2, "POWER SUPPLY ROUTING"

 .

Connector

Terminal

Voltage (Approx.)

M43

57 - Ground

Battery voltage

59 - Ground

0 V

SEIA0773E

Connector

Terminal

Voltage (Approx.)

M43

57 - Ground

Battery voltage

59 - Ground

SEIA0774E