Infiniti QX56 (Z62). Manual - part 1376

POWER SUPPLY AND GROUND CIRCUIT

WT-51

< DTC/CIRCUIT DIAGNOSIS >

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POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000006225530

1.

CHECK FUSE/FUSIBLE LINK

1.

Turn the ignition switch OFF.

2.

Check for fusing of the fuse and fusible link at the low tire pressure warning control unit.

-

Check the 10 A fuse [No. 3 in fuse block (J/B)]

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT POWER SUPPLY CIRCUIT

1.

Disconnect the low tire pressure warning control unit harness connector.

2.

Turn the ignition switch ON.

CAUTION:

Never start engine.

3.

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

4.

Turn the ignition switch OFF.

5.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>>

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

• Harness for short or open between ignition switch and low tire pressure warning control unit har-

ness connector

• Battery voltage.

3.

CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT GROUND CIRCUIT

1.

Turn the ignition switch OFF.

2.

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

-

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

Low tire pressure warning control unit

—

Voltage

Connector

Terminal

M96

15

Ground

Battery voltage

Low tire pressure warning control unit

—

Voltage

Connector

Terminal

M96

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Ground

0 V

Low tire pressure warning control unit

—

Continuity

Connector

Terminal

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32

Ground

Existed

WT-52

< DTC/CIRCUIT DIAGNOSIS >

LOW TIRE PRESSURE WARNING LAMP

LOW TIRE PRESSURE WARNING LAMP

Component Function Check

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1.

CHECK LOW TIRE PRESSURE WARNING LAMP OPERATION

Check that the low tire pressure warning lamp is turned OFF after turns ON for approximately 1 second, when
the ignition switch is turned ON.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

WT-52, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006225532

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.

PERFORM LOW TIRE PRESSURE WARNING CONTROL UNIT SELF-DIAGNOSIS

With CONSULT-III

1.

Drive for several minutes at a speed of 40 km/h (25 MPH) or more.

2.

Stop the vehicle.

3.

Perform self-diagnosis for “AIR PRESSURE MONITOR”.

Is any DTC detected?

YES

>> Perform trouble diagnosis for detected DTC. Refer to 

WT-18, "DTC Index"

.

NO

>> GO TO 3.

3.

CHECK LOW TIRE PRESSURE WARNING LAMP SIGNAL

With CONSULT-III

1.

Turn the ignition switch ON.

CAUTION:

Never start engine.

2.

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

3.

Read out the value of “WARNING LAMP”. For low tire pressure warning lamp condition, refer to “LOW
TIRE PRESSURE WARNING LAMP CONTROL CONDITION” in 

WT-9, "System Description"

.

Does the data monitor display change normal?

YES

>> GO TO 4.

NO

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

WT-65, "Removal and Installation"

.

4.

CHECK COMBINATION METER POWER SUPPLY CIRCUIT

Perform the trouble diagnosis for combination meter power supply circuit. Refer to 

MWI-64, "COMBINATION

METER : Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace error-detected parts.

TPMS SYMPTOMS

WT-53

< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

TPMS SYMPTOMS

Symptom Table

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LOW TIRE PRESSURE WARNING LAMP SYMPTOM CHART

WT-54

< SYMPTOM DIAGNOSIS >

TPMS SYMPTOMS

Diagnosis 

items

Symptom

(Ignition switch ON)

Low tire pressure warning lamp

Cause

Action

Low tire 
pressure 
warning 
lamp

The low tire pressure 
warning lamp illumi-
nates for 1 second, 
then turns OFF.

Wake-up operation for all 
transmitters at wheels is 
completed.

No procedure.
(No system malfunctions)

The low tire pressure 
warning lamp repeats 
blinking ON for 2 sec-
onds and OFF for 0.2 
seconds.

Wake-up operation for all 
transmitters at wheels is not 
completed.

Perform the wake-up oper-
ation for all transmitters at 
wheels. Refer to 

WT-28, 

"Work Procedure"

.

The low tire pressure 
warning lamp blinks 
once.

The front LH wheel trans-
mitter is not activated.

Perform the wake-up oper-
ation for the transmitter at 
front LH wheel. Refer to 

WT-28, "Work Procedure"

.

The low tire pressure 
warning lamp repeats 
blinking twice.

The front right wheel trans-
mitter is not activated.

Perform the wake-up oper-
ation for the transmitter at 
front right wheel. Refer to 

WT-28, "Work Procedure"

.

The low tire pressure 
warning lamp repeats 
blinking for 3 times.

The rear right wheel trans-
mitter is not activated.

Perform the wake-up oper-
ation for the transmitter at 
rear right wheel. Refer to 

WT-28, "Work Procedure"

. 

The low tire pressure 
warning lamp repeats 
blinking for 4 times.

The rear LH wheel transmit-
ter is not activated.

Perform the wake-up oper-
ation for the transmitter at 
rear LH wheel. Refer to 

WT-

28, "Work Procedure"

.

The low tire pressure 
warning lamp turns 
ON and stays illumi-
nated.

Low tire pressure

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

WT-69, "Tire Air Pressure"

. 

SEIA0592E

SEIA0593E

JPEIC0090GB

SEIA0595E

SEIA0596E

SEIA0597E

SEIA0598E