INFINITI QX56 2009 Factory Service Manual

SYSTEM SYMPTOMTM-133
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
DIAGNOSTIC PROCEDURE
1.CONFIRM THE SYMPTOM
Check if vehicle creeps forward in “D” position and vehicle can be started from D
1.
OK or NG
OK >> GO TO 2.
NG >> Refer to TM-126, "Vehicle Does Not Creep Forward in "D" Position"
, TM-129, "Vehicle Cannot Be
Started from D1".
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Do the self-diagnostic results indicate high and low reverse clutch solenoid valve, accelerator pedal position
sensor, output speed sensor and vehicle speed signal?
YES >> Check the malfuncti oning system. Refer to TM-86, "Diagnosis Procedure", EC-374, "Diagnosis
Procedure", TM-50, "Diagnosis Procedure", TM-74, "Diagnosis Procedure".
NO >> GO TO 3.
3.CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to TM-179, "Checking the A/T Fluid
(ATF)".
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4.CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to TM-188,
"Inspection and Judgment".
OK or NG
OK >> GO TO 7.
NG - 1 >> Line pressure high. GO TO 5.
NG - 2 >> Line pressure low. GO TO 6.
5.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "Disassembly"
.
3. Check the following items:
- Oil pump assembly. Refer to TM-249, "Oil Pump"
.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
6.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "Disassembly"
.
3. Check the following items:
- Oil pump assembly. Refer to TM-249, "Oil Pump"
.
SAT638A
SAT494G
Revision: December 20092009 QX56

TM-134
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
- Power train system. Refer to TM-232, "Disassembly".
- Transmission case. Refer to TM-232, "Disassembly"
.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
7.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-201, "Oil Pan"
.
2. Check A/T fluid condition. Refer to TM-179, "Checking the A/T
Fluid (ATF)".
OK or NG
OK >> GO TO 8.
NG >> GO TO 11.
8.DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are dam aged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.11).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
9.CHECK SYMPTOM
Check again. Refer to TM-191, "Cruise Test - Part 1"
, TM-193, "Cruise Test - Part 2", TM-194, "Cruise Test -
Part 3"
OK or NG
OK >> INSPECTION END
NG >> GO TO 10.
10.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-104, "Reference Value"
.
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness
connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
11 .DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are dam aged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.11).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
A/T Does Not Shift: D3 →D4INFOID:0000000003772001
SYMPTOM:
The vehicle does not shift-up from the D3 to D4 gear at the specified speed.
 The vehicle does not shift-up from the D
3 to D4 gear unless A/T is warmed up.
DIAGNOSTIC PROCEDURE
1.CONFIRM THE SYMPTOM
SCIA5199E
Revision: December 20092009 QX56

SYSTEM SYMPTOMTM-135
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
Check if vehicle creeps forward in “D” position and vehicle can be started from D1.
OK or NG
OK >> GO TO 2.
NG >> Refer to TM-126, "Vehicle Does Not Creep Forward in "D" Position"
, TM-129, "Vehicle Cannot Be
Started from D1".
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Do the self-diagnostic results indicate front brake solenoid valve, input clutch solenoid valve, accelerator pedal
position sensor, output speed sensor and vehicle speed signal?
YES >> Check the malfunctioning system. Refer to TM-82, "Diagnosis Procedure", TM-80, "Diagnosis
Procedure", EC-374, "Diagnosis Procedure", TM-50, "Diagnosis Procedure", TM-74, "Diagnosis
Procedure".
NO >> GO TO 3.
3.CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to TM-179, "Checking the A/T Fluid
(ATF)".
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4.CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to TM-188,
"Inspection and Judgment".
OK or NG
OK >> GO TO 7.
NG - 1 >> Line pressure high. GO TO 5.
NG - 2 >> Line pressure low. GO TO 6.
5.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "Disassembly"
.
3. Check the following items:
- Oil pump assembly. Refer to TM-249, "Oil Pump"
.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
6.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "Disassembly"
.
3. Check the following items:
- Oil pump assembly. Refer to TM-249, "Oil Pump"
.
- Power train system. Refer to TM-232, "Disassembly"
.
- Transmission case. Refer to TM-232, "Disassembly"
.
SAT638A
SAT494G
Revision: December 20092009 QX56

TM-136
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
7.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-201, "Oil Pan"
.
2. Check A/T fluid condition. Refer to TM-179, "Checking the A/T
Fluid (ATF)".
OK or NG
OK >> GO TO 8.
NG >> GO TO 11.
8.DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are dam aged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.12).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
9.CHECK SYMPTOM
Check again. Refer to TM-191, "Cruise Test - Part 1"
, TM-193, "Cruise Test - Part 2", TM-194, "Cruise Test -
Part 3"
OK or NG
OK >> INSPECTION END
NG >> GO TO 10.
10.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-104, "Reference Value"
.
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness
connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
11 .DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are dam aged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.12).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
A/T Does Not Shift: D4 →D5INFOID:0000000003772002
SYMPTOM:
The vehicle does not shift-up from the D4 to D5 gear at the specified speed.
 The vehicle does not shift-up from the D
4 to D5 gear unless A/T is warmed up.
DIAGNOSTIC PROCEDURE
1.CONFIRM THE SYMPTOM
Check if vehicle creeps forward in “D” position and vehicle can be started from D
1.
OK or NG
SCIA5199E
Revision: December 20092009 QX56

SYSTEM SYMPTOMTM-137
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
OK >> GO TO 2.
NG >> Refer to TM-126, "Vehicle Does Not Creep Forward in "D" Position"
, TM-129, "Vehicle Cannot Be
Started from D1".
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Do the self-diagnostic results indicate front brake sol enoid valve, direct clutch solenoid valve, accelerator
pedal position sensor, input speed sensor, output speed sensor and vehicle speed signal?
YES >> Check the malfunctioning system. Refer to TM-82, "Diagnosis Procedure"TM-84, "Diagnosis Pro-
cedure", EC-374, "Diagnosis Procedure", TM-47, "Diagnosis Procedure", TM-50, "Diagnosis Pro-
cedure", TM-74, "Diagnosis Procedure".
NO >> GO TO 3.
3.CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to TM-179, "Checking the A/T Fluid
(ATF)".
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4.CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to TM-188,
"Inspection and Judgment".
OK or NG
OK >> GO TO 7.
NG - 1 >> Line pressure high. GO TO 5.
NG - 2 >> Line pressure low. GO TO 6.
5.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "Disassembly"
.
3. Check the following items:
- Oil pump assembly. Refer to TM-249, "Oil Pump"
.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
6.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "Disassembly"
.
3. Check the following items:
- Oil pump assembly. Refer to TM-249, "Oil Pump"
.
- Power train system. Refer to TM-232, "Disassembly"
.
- Transmission case. Refer to TM-232, "Disassembly"
.
OK or NG
OK >> GO TO 7.
SAT638A
SAT494G
Revision: December 20092009 QX56

TM-138
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
NG >> Repair or replace damaged parts.
7.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-201, "Oil Pan"
.
2. Check A/T fluid condition. Refer to TM-179, "Checking the A/T
Fluid (ATF)".
OK or NG
OK >> GO TO 8.
NG >> GO TO 11.
8.DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are dam aged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.13).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
9.CHECK SYMPTOM
Check again. Refer to TM-191, "Cruise Test - Part 1"
.
OK or NG
OK >> INSPECTION END
NG >> GO TO 10.
10.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-104, "Reference Value"
.
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness
connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
11 .DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are dam aged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.13).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.
A/T Does Not Perform Lock-upINFOID:0000000003772003
SYMPTOM:
A/T does not perform lock-up at the specified speed.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Do the self-diagnostic results indicate torque conv erter clutch solenoid valve, engine speed signal, input
speed sensor, accelerator pedal position sensor, CAN communication?
YES >> Check the malfunctioning system. Refer to TM-64, "Diagnosis Procedure", TM-52, "Diagnosis
Procedure", TM-47, "Diagnosis Procedure", EC-374, "Diagnosis Procedure", TM-39, "Diagnosis
Procedure".
SCIA5199E
Revision: December 20092009 QX56

SYSTEM SYMPTOMTM-139
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
NO >> GO TO 2.
2.CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to TM-179, "Checking the A/T Fluid
(ATF)".
OK or NG
OK >> GO TO 3.
NG >> Refill ATF.
3.CHECK LINE PRESSURE
Check line pressure at the engine stall point. Refer to TM-188,
"Inspection and Judgment".
OK or NG
OK >> GO TO 6.
NG - 1 >> Line pressure high. GO TO 4.
NG - 2 >> Line pressure low. GO TO 5.
4.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "Disassembly"
.
3. Check the following items:
- Oil pump assembly. Refer to TM-249, "Oil Pump"
.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
5.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to TM-232, "Disassembly"
.
3. Check the following items:
- Oil pump assembly. Refer to TM-249, "Oil Pump"
.
- Power train system. Refer to TM-232, "Disassembly"
.
- Transmission case. Refer to TM-232, "Disassembly"
.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
6.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sensor 2"
.
SAT638A
SAT494G
Revision: December 20092009 QX56

TM-140
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
2. Check A/T fluid condition. Refer to TM-179, "Checking the A/T
Fluid (ATF)".
OK or NG
OK >> GO TO 7.
NG >> GO TO 10.
7.DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are dam aged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.24).
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
8.CHECK SYMPTOM
Check again. Refer to TM-191, "Cruise Test - Part 1"
.
OK or NG
OK >> INSPECTION END
NG >> GO TO 9.
9.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-104, "Reference Value"
.
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness
connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
10.DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are dam aged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.24).
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
A/T Does Not Hold Lock-up ConditionINFOID:0000000003772004
SYMPTOM:
The lock-up condition cannot be ma intained for more than 30 seconds.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Do the self-diagnostic results indicate torque conv erter clutch solenoid valve, engine speed signal, input
speed sensor, CAN communication?
YES >> Check the malfunctioning system. Refer to TM-64, "Diagnosis Procedure", TM-52, "Diagnosis
Procedure", TM-47, "Diagnosis Procedure", TM-39, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK A/T FLUID LEVEL
SCIA5199E
Revision: December 20092009 QX56

SYSTEM SYMPTOMTM-141
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
Check A/T fluid level. Refer to TM-179, "Checking the A/T Fluid
(ATF)".
OK or NG
OK >> GO TO 3.
NG >> Refill ATF.
3.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-201, "Oil Pan"
.
2. Check A/T fluid condition. Refer to TM-179, "Checking the A/T
Fluid (ATF)".
OK or NG
OK >> GO TO 4.
NG >> GO TO 7.
4.DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.25).
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.CHECK SYMPTOM
Check again. Refer to TM-191, "Cruise Test - Part 1"
.
OK or NG
OK >> INSPECTION END
NG >> GO TO 6.
6.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-104, "Reference Value"
.
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness
connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
7.DETECT MALFUNCTIONING ITEM
 Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to TM-152,
"Symptom Table" (Symptom No.25).
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
Lock-up Is Not ReleasedINFOID:0000000003772005
SYMPTOM:
The lock-up condition cannot be cancelled even after releasing the accelerator pedal.
SAT638A
SCIA5199E
Revision: December 20092009 QX56

TM-142
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Do the self-diagnostic results indicate torque conv erter clutch solenoid valve, engine speed signal, input
speed sensor, CAN communication?
YES >> Check the malfunctioning system. Refer to TM-64, "Diagnosis Procedure", TM-52, "Diagnosis
Procedure", TM-47, "Diagnosis Procedure", TM-39, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK SYMPTOM
Check again. Refer to TM-191, "Cruise Test - Part 1"
.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to TM-104, "Reference Value"
.
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness
connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
Engine Speed Does Not Return to IdleINFOID:0000000003772006
SYMPTOM:
When a shift-down is performed, the engine speed does not smoothly return to the idling speed.
DIAGNOSTIC PROCEDURE
1.CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to TM-179, "Checking the A/T Fluid
(ATF)".
OK or NG
OK >> GO TO 2.
NG >> Refill ATF.
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Do the self-diagnostic results indicate front brake sol enoid valve, direct clutch solenoid valve, accelerator
pedal position sensor, output speed sensor and vehicle speed signal?
YES >> Check the malfunctioning system. Refer to TM-82, "Diagnosis Procedure", TM-84, "Diagnosis
Procedure", EC-374, "Diagnosis Procedure", TM-50, "Diagnosis Procedure", TM-74, "Diagnosis
Procedure".
NO >> GO TO 3.
3.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to TM-203, "Control Valve with TCM and A/T Fluid Temperature Sensor 2"
.
SAT638A
Revision: December 20092009 QX56