2011 INFINITI QX56 Engine mechanical

SYSTEMSEC-15
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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INFINITI VEHICLE IMMOBILIZE R SYSTEM-NATS : System DiagramINFOID:0000000006226180
INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS : System DescriptionINFOID:0000000006226181
SYSTEM DESCRIPTION
 The INFINITI VEHICLE IMMOBILIZER SYSTEM-NAT S [IVIS (NATS)] prevents the engine from being
started by Intelligent Key whose ID is not registered to the vehicle (BCM). It has higher protection against
auto theft involving the duplication of mechanical keys.
 The ignition key integrated in the Intelligent Key cannot start the engine. When the Intelligent Key battery is
discharged, the IVIS (NATS) ID verification is performed between the transponder integrated with Intelligent
Key and BCM via NATS antenna amp. when the Intelligent Key backside is contacted to push-button ignition
switch. If the verification results are OK, the engine start operation can be performed by the push-button igni-
tion switch operation.
 Locate the security indicator lamp and apply the anti-t heft system equipment sticker that warns that the IVIS
(NATS) is on board the model.
 Security indicator lamp always blinks when the pow er supply position is any position other than ON.
 Up to 4 Intelligent Keys can be registered (including the standard ignition key) upon request from the owner.
 Specified registration is required when replacing ECM, BCM or Intelligent Key. For the registration proce-
dures, refer to CONSULT-III O peration Manual NATS-IVIS/NVIS.
 Possible symptom of IVIS (NATS) malfunction is “Engine cannot start”. The engine can not be started
because of other than IVIS (NATS) malfunction, so start the trouble diagnosis according to SEC-48, "
Work
Flow".
 If ECM other than genuine part is installed, the engi ne cannot be started. For ECM replacement procedure,
refer to EC-143, "
Work Procedure".
JMKIA5734GB
Revision: 2010 May2011 QX56

STR-12
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter motor and alternator test segments must be
done as a set from start to finish.
1.DIAGNOSIS WITH STARTING /CHARGING SYSTEM TESTER
Perform the starting system test with Starting/Char ging System Tester (SST: J-44373). For details and operat-
ing instructions, refer to Technical Service Bulletin.
Te s t r e s u l t
CRANKING VOLTAGE NORMAL>>GO TO 2.
CRANKING VOLTAGE LOW>>GO TO 5.
CHARGE BATTERY>>Perform the slow battery charging procedure. (Initial rate of charge is 10A for 12
hours.) Perform battery test again. Re fer to Technical Service Bulletin.
REPLACE BATTERY>>Before replacing battery, clean t he battery cable clamps and battery posts. Perform
battery test again. Refer to Technical Service Bu lletin. If second test result is “REPLACE BAT-
TERY”, then do so. Perform battery test again to confirm repair.
2.CRANKING CHECK
Check that the starter motor operates correctly.
Does the engine crank normally?
YES >> GO TO 3.
NO >> GO TO 4.
3.ENGINE START CHECK
Check that the engine starts.
Does the engine start?
YES >> Starter motor is OK. INSPECTION END
NO >> Perform further diagnosis of engine mechanical or engine control system. Refer EM and EC sec-
tions. Once resolved, perform battery test again.
4.STARTER MOTOR ACTIVATION
Check that the starter motor operates.
Does the starter motor turn?
YES >> Check ring gear and starter motor drive pinion. Once resolved, perform battery test again.
NO >> GO TO 7.
5.COMPARISON BETWEEN ENGINE COOLANT AND CRANKING VOLTAGE
Compare the engine coolant temperature and the cranking voltage with the specifications.
Minimum Specification of Cranking Voltage Referencing Coolant Temperature
Is the voltage less than the specified value?
YES >> GO TO 7.
NO >> GO TO 6.
6.STARTER OPERATION
Check the starter operation status.
Does the starter motor turn smoothly?
YES >> Starter motor is OK. INSPECTION END
NO >> GO TO 7.
7.“B” TERMINAL CIRCUIT INSPECTION
Check “B” terminal circuit. Refer to STR-14, "
Diagnosis Procedure".
Is
“B” terminal circuit normal?
Engine coolant temperature [ °C ( °F)] Voltage [V]
− 30 to −20 ( −22 to −4) 8.6
− 19 to −10 ( −2 to 14) 9.1
− 9 to 0 (16 to 32) 9.5
More than 1 (More than 34) 9.9
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORKFLOWSTR-13
< BASIC INSPECTION >
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YES >> GO TO 8.
NO >> Repair as needed.
8.“S” CONNECTOR CIRCUIT INSPECTION
Check “S” connector circuit. Refer to STR-15, "
Diagnosis Procedure".
Is
“S” connector circuit normal?
YES >> GO TO 9.
NO >> Repair as needed.
9.ENGINE ROTATION STATUS
Check that the engine can be rotated by hand.
Does the engine turn freely by hand?
YES >> Replace starter motor.
NO >> Perform further diagnosis of engine mechanical or powertrain mechanism. Once resolved, per-
form battery test again. Refer to Technical Service Bulletin.
Revision: 2010 May2011 QX56

TM-68
< ECU DIAGNOSIS INFORMATION >[7AT: RE7R01B]
TCM
ECU DIAGNOSIS INFORMATION
TCM
Reference ValueINFOID:0000000006226782
VALUES ON DIAGNOSIS TOOL
NOTE:
1. The CONSULT-III electrically displays shift timi
ng and lock-up timing (that is, operation timing of each
solenoid).
Check for time difference between actual shift timi ng and the CONSULT-III display. If the difference is
noticeable, mechanical parts (except solenoids, sens ors, etc.) may be malfunctioning. Check mechanical
parts in accordance with the specified diagnostic procedures.
2. Shift schedule (that implies gear position) on CONSULT-III may slightly differ from that is described in Ser-
vice Manual. This occurs because of the reasons as per the following:
- Actual shift schedule has more or less tolerance or allowance
- Shift schedule in Service Manual refers to the point where shifting starts
- Gear position on CONSULT-III indicates the point where shifting completes
3. Display of solenoid valves on CONSULT-III changes at t he start of shifting, while gear position is displayed
upon completion of shifting (which is computed by TCM).
CONSULT-III MONITOR ITEM
Item name Condition Value / Status (Approx.)
VHCL/S SE-A/T During driving Approximately equals the speed-
ometer reading.
ESTM VSP SIG During driving Approximately equals the speed-
ometer reading.
OUTPUT REV During driving (lock-up ON) Tachometer / Gear ratio
INPUT SPEED During driving (lock-up ON) Approximately equals the engine
speed.
F SUN GR REV During driving Revolution of front sun gear is indi-
cated.
F CARR GR REV During driving Revolution of front carrier is indi-
cated.
ENGINE SPEED Eng ine running Closely equals the tachometer
reading.
TC SLIP SPEED During driving Engine speed − Input speed
ACCELE POSI Accelerator pedal is released 0.0/8
Accelerator pedal is fully depressed 8.0/8
THROTTLE POSI Accelerator pedal is released 0.0/8
Accelerator pedal is fully depressed 8.0/8
ATF TEMP 1 Ignition switch ON Temperature of ATF in the oil pan is
indicated.
ATF TEMP 2 Ignition switch ON Temperature of ATF at the exit of
torque converter.
AT F T E M P S E 1 0 °C (32 ° F) – 20 °C (68 °F) – 80 °C (176 °F) 3.3 – 2.7 – 0.9 V
BATTERY VOLT Ignition switch ON Battery voltage (11 V – 14 V)
LINE PRES SOL During driving 0.2 – 0.6 A
TCC SOLENOID Slip lock-up is active 0.2 – 0.8 A
Lock-up is active 0.8 A
Other than the above 0 A
L/B SOLENOID Low brake is engaged 0.6 – 0.8 A
Low brake is disengaged 0 – 0.05 A
Revision: 2010 May2011 QX56

TM-114
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0729 6GR INCORRECT RATIO
P0729 6GR INCORRECT RATIO
DescriptionINFOID:0000000006226815
This malfunction is detected when the A/T does not shift
into 6GR position as instructed by TCM. This is not
only caused by electrical malfunction (circuits open or s horted) but by mechanical malfunction such as control
valve sticking, improper solenoid valve operation, etc.
DTC LogicINFOID:0000000006226816
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
“ TM-115, "
Diagnosis Procedure"” must be performed before starting “DTC CONFIRMATION PROCE-
DURE”.
 Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause secondary malfunction.
 Always drive vehicle at a safe speed.
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 ATF TEMPERATURE
With CONSULT-III
1. Start the engine.
2. Select “ATF TEMP 1” in “Data Monitor” in “TRANSMISSION”.
3. Check ATF temperature is in the following range.
With GST
1. Start the engine.
2. Drive vehicle for approximately 5 minutes in urban areas.
Is ATF temperature within specified range?
YES >> GO TO 3.
NO >> Drive vehicle to warm ATF or stop engine to cool ATF.
3.CHECK SYMPTOM (PART 1)
With CONSULT-III
1. Select “6TH GR FNCTN P0729” in “DTC & SRT confirmation” in “TRANSMISSION”.
2. Drive vehicle with manual mode and maintain the following conditions.
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0729 Gear 6 Incorrect Ratio The gear ratio is:
 0.915 or more
 0.813 or less Input clutch solenoid valve
 Direct clutch solenoid valve
 High and low reverse clutch
solenoid valve
 Front brake solenoid valve
 Low brake solenoid valve
 2346 brake solenoid valve
 Anti-interlock solenoid valve
 Each clutch and brake
 Output speed sensor
 Input speed sensor 1, 2
 Hydraulic co ntrol circuit
ATF TEMP 1 : 20 °C (68 °F) – 140 °C (284 °F)
Revision: 2010 May2011 QX56

TM-118
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0731 1GR INCORRECT RATIO
P0731 1GR INCORRECT RATIO
DescriptionINFOID:0000000006226821
This malfunction is detected when the A/T does not shift
into 1GR position as instructed by TCM. This is not
only caused by electrical malfunction (circuits open or s horted) but by mechanical malfunction such as control
valve sticking, improper solenoid valve operation, etc.
DTC LogicINFOID:0000000006226822
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
“ TM-119, "
Diagnosis Procedure"” must be performed before starting “DTC CONFIRMATION PROCE-
DURE”.
 Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause secondary malfunction.
 Always drive vehicle at a safe speed.
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 ATF TEMPERATURE
With CONSULT-III
1. Start the engine.
2. Select “ATF TEMP 1” in “Data Monitor” in “TRANSMISSION”.
3. Check ATF temperature is in the following range.
With GST
1. Start the engine.
2. Drive vehicle for approximately 5 minutes in urban areas.
Is ATF temperature within specified range?
YES >> GO TO 3.
NO >> Drive vehicle to warm ATF or stop engine to cool ATF.
3.CHECK SYMPTOM (PART 1)
With CONSULT-III
1. Select “1ST GR FNCTN P0731” in “DTC & SRT confirmation” in “TRANSMISSION”.
2. Drive vehicle with manual mode and maintain the following conditions.
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0731 Gear 1 Incorrect Ratio The gear ratio is:
 5.180 or more
 4.594 or less Input clutch solenoid valve
 Direct clutch solenoid valve
 High and low reverse clutch
solenoid valve
 Front brake solenoid valve
 Low brake solenoid valve
 2346 brake solenoid valve
 Anti-interlock solenoid valve
 Each clutch and brake
 Output speed sensor
 Input speed sensor 1, 2
 Hydraulic co ntrol circuit
ATF TEMP 1 : 20 °C (68 °F) – 140 °C (284 °F)
Revision: 2010 May2011 QX56

TM-120
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0732 2GR INCORRECT RATIO
P0732 2GR INCORRECT RATIO
DescriptionINFOID:0000000006226824
This malfunction is detected when the A/T does not shift
into 2GR position as instructed by TCM. This is not
only caused by electrical malfunction (circuits open or s horted) but by mechanical malfunction such as control
valve sticking, improper solenoid valve operation, etc.
DTC LogicINFOID:0000000006226825
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
“ TM-121, "
Diagnosis Procedure"” must be performed before star ting “DTC CONFIRMATION PROCE-
DURE”.
 Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause secondary malfunction.
 Always drive vehicle at a safe speed.
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 ATF TEMPERATURE
With CONSULT-III
1. Start the engine.
2. Select “ATF TEMP 1” in “Data Monitor” in “TRANSMISSION”.
3. Check ATF temperature is in the following range.
With GST
1. Start the engine.
2. Drive vehicle for approximately 5 minutes in urban areas.
Is ATF temperature within specified range?
YES >> GO TO 3.
NO >> Drive vehicle to warm ATF or stop engine to cool ATF.
3.CHECK SYMPTOM (PART 1)
With CONSULT-III
1. Select “2ND GR FNCTN P0732” in “DTC & SRT confirmation” in “TRANSMISSION”.
2. Drive vehicle with manual mode and maintain the following conditions.
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0732 Gear 2 Incorrect Ratio The gear ratio is:
 3.360 or more
 2.980 or less Input clutch solenoid valve
 Direct clutch solenoid valve
 High and low reverse clutch
solenoid valve
 Front brake solenoid valve
 Low brake solenoid valve
 2346 brake solenoid valve
 Anti-interlock solenoid valve
 Each clutch and brake
 Output speed sensor
 Input speed sensor 1, 2
 Hydraulic control circuit
ATF TEMP 1 : 20 °C (68 °F) – 140 °C (284 °F)
Revision: 2010 May2011 QX56

TM-122
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0733 3GR INCORRECT RATIO
P0733 3GR INCORRECT RATIO
DescriptionINFOID:0000000006226827
This malfunction is detected when the A/T does not shift
into 3GR position as instructed by TCM. This is not
only caused by electrical malfunction (circuits open or s horted) but by mechanical malfunction such as control
valve sticking, improper solenoid valve operation, etc.
DTC LogicINFOID:0000000006226828
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
“ TM-123, "
Diagnosis Procedure"” must be performed before star ting “DTC CONFIRMATION PROCE-
DURE”.
 Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause secondary malfunction.
 Always drive vehicle at a safe speed.
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 ATF TEMPERATURE
With CONSULT-III
1. Start the engine.
2. Select “ATF TEMP 1” in “Data Monitor” in “TRANSMISSION”.
3. Check ATF temperature is in the following range.
With GST
1. Start the engine.
2. Drive vehicle for approximately 5 minutes in urban areas.
Is ATF temperature within specified range?
YES >> GO TO 3.
NO >> Drive vehicle to warm ATF or stop engine to cool ATF.
3.CHECK SYMPTOM (PART 1)
With CONSULT-III
1. Select “3RD GR FNCTN P0733” in “DTC & SRT confirmation” in “TRANSMISSION”.
2. Drive vehicle with manual mode and maintain the following conditions.
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0733 Gear 3 Incorrect Ratio The gear ratio is:
 2.148 or more
 1.906 or less Input clutch solenoid valve
 Direct clutch solenoid valve
 High and low reverse clutch
solenoid valve
 Front brake solenoid valve
 Low brake solenoid valve
 2346 brake solenoid valve
 Anti-interlock solenoid valve
 Each clutch and brake
 Output speed sensor
 Input speed sensor 1, 2
 Hydraulic control circuit
ATF TEMP 1 : 20 °C (68 °F) – 140 °C (284 °F)
Revision: 2010 May2011 QX56