ESP INFINITI QX56 2011 Factory Service Manual

TM-60
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ON BOARD DIAGNO
STIC (OBD) SYSTEM
Diagnosis DescriptionINFOID:0000000006226780
The A/T system has two self-diagnostic systems.
The first is the emission-related on board diagnostic syst em (OBD-II) performed by the TCM in combination
with the ECM. A malfunction is indicated by the MI (ma lfunction indicator) and is stored as a DTC in the ECM
memory and in the TCM memory.
The second is the TCM original self-diagnosis indicated by the TCM. A malfunction history is stored in the
TCM memory. The detected items are overlapped with OB D-II self-diagnostic items. For details, refer to TM-
78, "DTC Index".
OBD FUNCTION
The ECM provides emission-related on board diagnos tic (OBD-II) functions for the A/T system.
One function is to receive a signal from the TCM used with OBD-related parts of the A/T system. The signal is
sent to the ECM when a malfunction occurs in the corresponding OBD-related part.
The other function is to indicate a diagnostic result by means of the MI (malfunction indicator) on the instru-
ment panel. Sensors, switches and solenoi d valves are used as sensing elements.
The MI automatically illuminates in “One or Two Trip Detection Logic” when a malfunction is sensed in relation
to A/T system parts. For details, refer to EC-52, "
DIAGNOSIS DESCRIPTION : 1st Trip Detection Logic and
Two Trip Detection Logic".
Revision: 2010 May2011 QX56

TM-110
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0720 OUTPUT SPEED SENSOR
P0720 OUTPUT SPEED SENSOR
DTC LogicINFOID:0000000006226810
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
 Always drive vehicle at a safe speed.
 Be careful not to rev engine into
the red zone on the tachometer.
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” is previously c onducted, always turn ignition switch OFF and wait at
least 10 seconds before performing the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select “ESTM VSP SIG” in “Data Monitor” in “TRANSMISSION”.
3. Drive vehicle and maintain the following conditions for 60 seconds or more.
4. Perform “Self Diagnostic Results” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”.
Is
“P0720” detected?
YES >> Go to TM-110, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226811
1.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0720 Output Speed Sensor Circuit  The vehicle speed detected
by the output speed sensor is
5 km/h (3MPH) or less when
the vehicle speed transmitted
from the combination meter
to TCM is 20 km/h or more.
(Only when starts after the ig-
nition switch is turned ON.)
 The vehicle speed transmit- ted from the combination
meter to TCM does not de-
crease despite the 36 km/h
(23 MPH) or more of deceler-
ation in vehicle speed detect-
ed by the output speed
sensor. when the vehicle
speed detected by the output
speed sensor is 36 km/h (23
MPH) or more and the vehicle
speed transmitted from the
combination meter to TCM is
24 (15 MPH) or more.  Harness or connectors
(Sensor circuit is open.)
 Output speed sensor
ESTM VSP SIG : 40 km/h (25 MPH) or more
Revision: 2010 May2011 QX56

TM-138
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P1721 VEHICLE SPEED SIGNAL
P1721 VEHICLE SPEED SIGNAL
DescriptionINFOID:0000000006226854
The vehicle speed signal is transmitted from combinati
on meter to TCM via CAN communication line. The sig-
nal functions as an auxiliary device to the output speed sensor when it is malfunctioning. The TCM will then
use the vehicle speed signal.
DTC LogicINFOID:0000000006226855
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
 Always drive vehicle at a safe speed.
 Be careful not to rev engine into the red zone on the tachometer.
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” is previously c onducted, always turn ignition switch OFF and wait at
least 10 seconds before performing the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select “VHCL/S SE-A/T” in “Data Monitor” in “TRANSMISSION”.
3. Drive vehicle and maintain the following conditions for 60 seconds or more.
4. Perform “Self Diagnostic Results” in “TRANSMISSION”.
Is
“P1721” detected?
YES >> Go to TM-139, "Diagnosis Procedure".
NO >> INSPECTION END
DTC Trouble diagnosis name DTC is detected if... Possible cause
P1721 Vehicle Speed Signal Circuit  The vehicle speed transmit-
ted from the combination
meter to TCM is 5 km/h
(3MPH) or less when the ve-
hicle speed detected by the
output speed sensor is 20
km/h or more. (Only when
starts after the ignition switch
is turned ON.)
 The vehicle speed detected by the output speed sensor
does not decrease despite
the 36 km/h (23 MPH) or
more of deceleration in vehi-
cle speed received from the
combination meter when the
vehicle speed transmitted
from the combination meter
to TCM is 36 km/h (23 MPH)
or more and the vehicle
speed detected by the output
speed sensor is 24 (15 MPH)
or more. Harness or connectors
(Sensor circuit is open or short-
ed.)
VHCL/S SE-A/T : 40 km/h (25 MPH) or more
Revision: 2010 May2011 QX56

WT-4
< PRECAUTION >
PRECAUTIONS
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button igniti on switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.
Service Notice or Precautions for TPMSINFOID:0000000006225485
 Low tire pressure warning lamp blinks for 1min, then turns ON when occurring any malfunction except low tire pressure. Erase the self-diagnosis memories for low tire pressure warning control unit, or register the ID
to turn low tire pressure warning lamp OFF. For ID registration, refer to WT-29, "
Work Procedure".
 ID registration is required when replacing or rotating wheel s, replacing transmitter or low tire pressure warn-
ing control unit. Refer to WT-29, "
Work Procedure".
 Replace grommet seal, valve core and cap of transmitter in TPMS, when replacing each tire by reaching the
wear limit. Refer to WT-66, "
Exploded View".
 For tire inflation indicator function, refer to the following.
- When inflating the tires, park the vehicle in the safe area and ensure the safety of the working area.
- Read and understand the tire inflation indicator function prior to use.
- Inflate the tires one at a time.
- 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.
- Despite the high-precision TPMS pressure sensor, an i ndicated value may differ from that of the pressure
gauge.
- Air pressure is measured rather high due to the rise in tire air temperature after driving.
- If TPMS is malfunctioning, the tire inflation indicator is unusable.
Service Notice or Precautions for Road WheelINFOID:0000000006225486
 Genuine NISSAN aluminum wheel is designed for each type of vehicle. Use it on the specified vehicle only.
 Use Genuine NISSAN parts for the wheel nuts.
 Always use them after adjusting the wheel balance. For the balance weights, use Genuine NISSAN alumi-
num wheel weights.
 Use caution when handling the aluminum wheels, because they can be easily scratched. When removing
dirt, do not use any abrasives, a wire brush, or other it ems that may scratch the coating. Use a neutral deter-
gent if a detergent is needed.
 After driving on roads scattered with anti-ici ng salts, wash off the wheels completely.
 When installing road wheels onto the vehicle, always wipe of f any dirt or foreign substances to prevent them
from being trapped between the contact surfaces of wheel.
 Never apply oil to nut and bolt threads.
Revision: 2010 May2011 QX56

SYSTEMWT-11
< SYSTEM DESCRIPTION >
C
DF
G H
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K L
M A
B
WT
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O P
 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.
Revision: 2010 May2011 QX56

TIRE INFLATION INDICATOR DOES NOT ACTIVATEWT-59
< SYMPTOM DIAGNOSIS >
C
DF
G H
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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