2011 INFINITI QX56 engine

TM-112
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0725 ENGINE SPEED
P0725 ENGINE SPEED
DescriptionINFOID:0000000006226812
The engine speed signal is transmitted from the ECM to the TCM via CAN communication line.
DTC LogicINFOID:0000000006226813
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
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 DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select “SLCT LVR POSI” and “VHCL/S SE-A/T ” in “Data Monitor” in “TRANSMISSION”.
3. Drive vehicle and maintain the following conditions for 5 seconds or more.
4. Perform “Self Diagnostic Results” in “TRANSMISSION”.
Is
“P0725” detected?
YES >> Go to TM-112, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226814
1.CHECK DTC OF ECM
With CONSULT-III
1. Turn ignition switch ON.
2. Perform “Self Diagnostic Results” in “ENGINE”.
Is any DTC detected?
YES >> Check DTC detected item. Refer to EC-98, "DTC Index".
NO >> GO TO 2.
2.CHECK DTC OF TCM
With CONSULT-III
Perform “Self Diagnostic Resu lts” in “TRANSMISSION”.
Is any DTC other than
“P0725” detected?
YES >> Check DTC detected item. Refer to TM-78, "DTC Index".
NO >> GO TO 3.
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0725 Engine Speed Input Circuit  TCM does not receive the
CAN communication signal
from the ECM.
 The engine speed is more
less 150 rpm even if the vehi-
cle speed is more than 10 km/
h (7 MPH). Harness or connectors
(ECM to TCM circuit is open or
shorted.)
SLCT LVR POSI : D
VHCL/S SE-A/T : More than 10 km/h (7 MPH)
Revision: 2010 May2011 QX56

P0725 ENGINE SPEEDTM-113
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
3.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> Replace the control valve & TCM. Refer to TM-182, "Exploded View".
NO >> Repair or replace damaged parts.
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-116
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0730 INCORRECT GEAR RATIO
P0730 INCORRECT GEAR RATIO
DescriptionINFOID:0000000006226818
 TCM detects a high-rpm state of the under drive sun gear.
 The number of revolutions of the under drive sun gear
is calculated with the input speed sensor 1 and 2.
DTC LogicINFOID:0000000006226819
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
“TM-116, "
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 DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Select “Self Diagnostic Results” in “ENGINE”.
3. Drive vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the
table below.
Hold the accelerator pedal as steady as possible.
With GST
Follow the procedure “With CONSULT-III”.
Is
“P0730” detected?
YES >> Go to TM-116, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226820
1.DETECT MALFUNCTIONING ITEM
Disassemble the A/T assembly to check component parts. Refer to TM-211, "
Exploded View".
NOTE:
Check the component parts, referring to “Possible cause” in “DTC DETECTION LOGIC”. Refer to TM-116,
"DTC Logic".
Is the inspection result normal?
DTC Trouble diagnosis name DTC is detected if... Possible cause
P0730 Incorrect Gear Ratio The revolution of under drive
sun gear is 8,000 rpm or more.
NOTE:
Not detected when in “P” or “N”
position and during a shift to “P”
or “N” position. 2346 brake solenoid valve
 Front brake solenoid valve
 Input speed sensor 2
ENGINE SPEED Same value as
the Freeze Frame Data.
VEHICLE SPEED Same value as the Freeze Frame Data.
B/FUEL SCHDL Same value as the Freeze Frame Data.
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

TM-124
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P0734 4GR INCORRECT RATIO
P0734 4GR INCORRECT RATIO
DescriptionINFOID:0000000006226830
This malfunction is detected when the A/T does not shift
into 4GR 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:0000000006226831
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
“ TM-125, "
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 “4TH GR FNCTN P0734” 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
P0734 Gear 4 Incorrect Ratio The gear ratio is:
 1.496 or more
 1.328 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