2011 INFINITI QX56 Eco

WT-48
< DTC/CIRCUIT DIAGNOSIS >
C1755, C1756, C1757, C1758 POOR RECEIVING CONDITIONS
Is the inspection result normal?
YES >> GO TO 3.
NO >> Change the work location, then GO TO 1.
3.CHECK SELF-DIAGNOSIS RESULTS
With CONSULT-III
1. Erase the self-diagnosis memory for the low tire pressure warning control unit.
2. Turn ignition switch OFF, and wait for 10 seconds or more.
3. Perform “DTC CONFIRMATION PROCE DURE” (self-diagnosis) again. Refer to WT-47, "
DTC Logic".
Are DTC
“C1755”, “C1756”, “C1757”, or “C1758” and “C1708”, “C1709”, “C1710”, or “C1711” detected?
YES >> Change the work location, then GO TO 1.
NO >> Check the input/output signal values. Refer to WT-14, "
Reference Value".
AIR PRESS RR Approximately equal to the indica tion on tire gauge value for rear RH tire
AIR PRESS RL Approximately equal to the indicati on on tire gauge value for rear LH tire
Monitor item Displayed value
Revision: 2010 May2011 QX56

U1000 CAN COMM CIRCUITWT-49
< DTC/CIRCUIT DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
WT
N
O P
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006225524
CAN (Controller Area Network) is a serial communication li ne for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit communicates data but selectively reads required data only.
DTC LogicINFOID:0000000006225525
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION
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 DTC
“U1000” detected?
YES >> Proceed to WT-49, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225526
Proceed to LAN-27, "CAN COMMUNICATION SYSTEM : CA N System Specification Chart".
DTC Display item Malfunction detected condition Possible cause
U1000 CAN COMM CIRCUIT Low tire pressure warn
ing control unit is
not communicating CAN communication
signal for 2 seconds or more.  CAN communication malfunction
 Malfunction of low tire pressure warn-
ing control unit
Revision: 2010 May2011 QX56

WT-52
< DTC/CIRCUIT DIAGNOSIS >
LOW TIRE PRESSURE WARNING LAMP
LOW TIRE PRESSURE WARNING LAMP
Component Function CheckINFOID:0000000006225531
1.CHECK LOW TIRE PRESSURE WARNING LAMP OPERATION
Check that the low tire pressure warning lamp is tu rned 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 ProcedureINFOID:0000000006225532
1.CHECK LOW TIRE PRESSURE WARNING CONT ROL 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 WARNI NG CONTROL UNIT SELF-DIAGNOSIS
With CONSULT-III
1. Drive for several minutes at a s peed 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 PR ESSURE 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 LA MP 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.
Revision: 2010 May2011 QX56

WT-54
< SYMPTOM DIAGNOSIS >
TPMS SYMPTOMS
Diagnosis items Symptom
(Ignition switch ON) Low tire pressure wa
rning 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
Revision: 2010 May2011 QX56

TPMS SYMPTOMSWT-55
< SYMPTOM DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
WT
N
O P
NOTE:
If transmitter wake-up operation is not completed for tw o or more transmitters, the applicable low tire pressure
warning lamp blinking patterns are displayed continuously.
(Example: Blinks once/OFF/blinks 3 times = Wake-up operation is not completed at the front LH wheel and
rear RH wheel transmitters.)
Low tire
pressure
warning
lamp The low tire pressure
warning lamp repeats
blinking at 0.5-second
intervals for 1 minute,
and then stays illumi-
nated. The combination meter fuse
is open or removed (or
pulled out).
Check and install the com-
bination meter fuse. If nec-
essary, replace the fuse.
The low tire pr essure warn-
ing control unit harness
connector is removed. Check the connection con-
ditions of the low tire pres-
sure warning
control unit
harness connector, and re-
pair if necessary.
Tire Pressure Monitoring
System (TPMS) malfunc-
tion.  Perform self-diagnosis.
- If necessary, perform
transmitter ID registra-
tion. Refer to WT-29,
"Work Procedure".
Hazard
warning
lamp The hazard warning
lamp does not blink
twice when the trans-
mitter is activated.
— The transmitter activation
tool does not activate.  Replace the battery in the
transmitter activation
tool.
 The ignition switch is OFF when the transmitter
wake-up operation is per-
formed.  Turn the ignition switch
ON when performing the
transmitter wake-up op-
eration.
 The transmitter activation tool is not used in the cor-
rect position.  Operate the transmitter
activation tool in the cor-
rect position when per-
forming the wake-up
operation.
 The transmitter is already waked up.  No procedure.
Diagnosis
items Symptom
(Ignition switch ON) Low tire pressure wa
rning lamp Cause Action
SEIA0788E
Revision: 2010 May2011 QX56

WT-56
< SYMPTOM DIAGNOSIS >
LOW TIRE PRESSURE WARNING LAMP DOES NOT TURN ON
LOW TIRE PRESSURE WARNING LAMP DOES NOT TURN ON
DescriptionINFOID:0000000006225534
The low tire pressure warning lamp does not illuminate when the ignition switch is turned ON.
NOTE:
The low tire pressure warning lamp illuminates for approximately 1 second and then turns OFF when the igni-
tion switch is turned ON. This is to check that no abnorma l condition is present in the tire pressure monitoring
system.
The lamp bulb may be burnt out or the tire pressure monitoring system may be malfunctioning if the low tire
pressure warning lamp does not illuminate when the ignition switch is turned ON.
Diagnosis ProcedureINFOID:0000000006225535
1.CHECK LOW TIRE PRESSURE WARNING LAMP
Perform trouble diagnosis for the low tire pressure warning lamp. Refer to WT-52, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> Check each harness connector pin terminal for malfunction or disconnection.
NO >> Repair or replace error-detected parts.
Revision: 2010 May2011 QX56

LOW TIRE PRESSURE WARNING LAMP DOES NOT TURN OFFWT-57
< SYMPTOM DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
WT
N
O P
LOW TIRE PRESSURE WARNING LAMP DOES NOT TURN OFF
DescriptionINFOID:0000000006225536
The low tire pressure warning lamp does not turn OFF after several seconds is passed after engine starts.
Diagnosis ProcedureINFOID:0000000006225537
1.CHECK TIRE PRESSURE
1. Turn the ignition switch ON. CAUTION:
Never start the engine.
2. Check the tire pressure for all wheels and adjust to the specified value. Refer to WT-69, "
Tire Air Pres-
sure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Inspect or repair the tires or wheels.
2.CHECK LOW TIRE PRE SSURE WARNING LAMP
Check low tire pressure warning lamp display.
Does not low tire pressure warning lamp turn OFF?
YES >> GO TO 3.
NO >> INSPECTION END
3.CHECK DTC WITH LOW TIRE PR ESSURE WARNING CONTROL UNIT
With CONSULT-III
Perform self-diagnosis for “AIR PRESSURE MONITOR”.
Is any DTC detected?
YES >> Perform the diagnosis applicable to the displayed DTC. Refer to WT-18, "DTC Index".
NO >> GO TO 4.
4.CHECK LOW TIRE PRESSURE WARNING CONT ROL 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 >> Replace low tire pressure warning control unit. Refer to WT-65, "Removal and Installation".
NO >> Repair or replace error-detected parts.
Revision: 2010 May2011 QX56

TIRE INFLATION INDICATOR DOES NOT ACTIVATEWT-59
< SYMPTOM DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
WT
N
O P
TIRE INFLATION INDICATOR DOES NOT ACTIVATE
DescriptionINFOID:0000000006225540
The tire inflation indicator does not function while inflat ing a tire when the A/T shift selector position is in P-
range with the ignition switch ON or with the engine started.
NOTE:
 After starting to inflate the tire, it takes a few seconds for the tire inflation indicator to function.
 If there is no response for approximately 15 seconds or mo re after inflating the tires, cancel the use of the
tire inflation indicator function or move the vehicle approximately 1 m (3.2 ft) backward or forward to try
again. The air filler pressure may be weak or out of service area.
 For tire inflation indicator, Refer to WT-10, "
Tire Inflation Indicator Function".
Diagnosis ProcedureINFOID:0000000006225541
1. LOCATION CHANGE
Move the vehicle to other area and repeat the procedure of the tire inflation indicator function. Refer to WT-10,
"Tire Inflation Indicator Function".
Is the function normal?
YES >> Normal (the tire inflation indicator may not operate, depending on reception condition.)
NO >> GO TO 2.
2.PERFORM LOW TIRE PRESSURE WARNI NG CONTROL UNIT SELF-DIAGNOSIS
With CONSULT-III
1. Drive for 10 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 HAZARD WARNING LAMP OPERATION
Check hazard warning lamp operation with hazard switch.
Does the hazard warning lamp blink?
YES >> GO TO 4.
NO >> Perform trouble diagnosis for the hazard warning lamp. Refer to EXL-113, "
Symptom Table".
4.PERFORM TCM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “TRANSMISSION”.
Is any DTC detected?
YES >> Check malfunctioning circuit. Refer to TM-78, "DTC Index".
NO >> GO TO 5.
5.CHECK HORN OPERATION
Check horn operation. Refer to SEC-143, "
ComponentFunctionCheck".
Is the operation normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.PERFORM BCM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “BCM”.
Is any DTC detected?
YES >> Check malfunctioning circuit. Refer to BCS-57, "DTCIndex".
NO >> Replace low tire pressure warning control unit. Refer to WT-65, "
Removal and Installation".
Revision: 2010 May2011 QX56