2007 INFINITI QX56 automatic transmission

AT-22
< SERVICE INFORMATION >
A/T CONTROL SYSTEM
• —Operates
• —Operates during “progressive” acceleration.
• —Operates and effects power transmission while coasting.
• —Line pressure is applied but does not affect power transmission.
• —Operates under conditions shown in HLR/C Operating Condition
• —Operates under conditions shown in LC/B Operating Condition. Delay control is applied during D (4,3,2,1) ⇒N shift.
POWER TRANSMISSION
“N” Position
NNEUTRAL POSI-
TION
D1st
Automatic shift
1⇔2⇔3⇔4⇔5 2nd
3rd
4th
5th
1st
42nd
Automatic shift
3rd1⇔2⇔3⇔4
4th
31st
Automatic shift
1⇔2⇔3⇐4 2nd
3rd
4th
21st
Automatic shift
1⇔2⇐3⇐4 2nd
3rd
4th
11st
Locks (held sta-
tionary in 1st
gear)
1⇐2⇐3⇐4 2nd
3rd
4th Shift position I/C HLR/C D/C R/B FR/B LC/B Fwd/B1st
OWCFwd
OWC3rd
OWCRemarks
SCIA5642E

A/T CONTROL SYSTEM
AT-31
< SERVICE INFORMATION >
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TCM FunctionINFOID:0000000003532230
The function of the TCM is to:
• Receive input signals sent from various switches and sensors.
• Determine required line pressure, shifting point, lock-up operation, and engine brake operation.
• Send required output signals to the respective solenoids.
CONTROL SYSTEM OUTLINE
The automatic transmission senses vehicle operating conditions through various sensors or signals. It always
controls the optimum shift position and reduces shifting and lock-up shocks.
1. Front brake 2. Input clutch 3. Direct clutch
4. High and low reverse clutch 5. Reverse brake 6. Forward brake
7. Low coast brake 8. 1st one-way clutch 9. Forward one-way clutch
10. 3rd one-way clutch 11. Front sun gear 12. Input shaft
13. Mid internal gear 14. Front internal gear 15. Rear carrier
16. Rear sun gear 17. Mid sun gear 18. Front carrier
19. Mid carrier 20. Rear internal gear 21. Output shaft
22. Parking gear 23. Parking pawl
SCIA1519E

TROUBLE DIAGNOSIS
AT-51
< SERVICE INFORMATION >
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Circuit DiagramINFOID:0000000003532247
Inspections Before Trouble DiagnosisINFOID:0000000003532248
A/T FLUID CHECK
Fluid Leakage and Fluid Level Check
• Inspect for fluid leakage and check the fluid level. Refer to AT-13, "Changing Automatic Transmission Fluid
(ATF)".
BCWA0496E

DTC P0717 TURBINE REVOLUTION SENSOR
AT-103
< SERVICE INFORMATION >
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DTC P0717 TURBINE REVOLUTION SENSOR
DescriptionINFOID:0000000003532285
The turbine revolution sensor detects input shaft rpm (revolutions per minute). It is located on the input side of
the automatic transmission. Monitors revolution of sensor 1 and sensor 2 for non-standard conditions.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003532286
On Board Diagnosis LogicINFOID:0000000003532287
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0717 TURBINE REV S/CIRC” with CONSULT-II is detected under the following
conditions.
- When TCM does not receive the proper voltage signal from the sensor.
- When TCM detects an irregularity only at position of 4th gear for turbine revolution sensor 2.
Possible CauseINFOID:0000000003532288
• Harness or connectors
(The sensor circuit is open or shorted.)
• Turbine revolution sensor 1, 2
DTC Confirmation ProcedureINFOID:0000000003532289
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 40 km/h (25 MPH) or more
ENGINE SPEED: 1,500 rpm or more
ACCELE POS: 0.5/8 or more
Selector lever: “D” position
Gear position (Turbine revolution sensor 1): 4th or 5th posi-
tion
Gear position (Turbine revolution sensor 2): All position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions required for this test.
4. If DTC is detected, go to AT-103, "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-II”.
Diagnosis ProcedureINFOID:0000000003532290
1.CHECK INPUT SIGNAL
With CONSULT-II
Item name Condition Display value (rpm)
TURBINE REV During driving (lock-up ON) Approximately matches the engine speed.
BCIA0031E

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-169
< SERVICE INFORMATION >
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Even though the selector lever is set in the “P” position, the parking mechanism is not actuated,
allowing the vehicle to be moved when it is pushed.
DIAGNOSTIC PROCEDURE
1.CHECK PNP SWITCH CIRCUIT
Perform self-diagnosis. Refer to AT-83, "
CONSULT-II Function (A/T)".
Do the self-diagnosis results indicate PNP switch?
YES >> Check the malfunctioning system. Refer to AT- 9 9.
NO >> GO TO 2.
2.CHECK CONTROL CABLE
Check the control cable.
• Refer to AT-208, "
Checking of A/T Position".
OK or NG
OK >> GO TO 3.
NG >> Adjust control cable. Refer to AT-208, "
Adjustment of A/
T Position".
3.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT-210, "
Control Valve with TCM and A/T Fluid Temperature Sensor 2".
2. Check A/T fluid condition. Refer to AT-13, "
Checking Automatic
Transmission Fluid (ATF)".
OK or NG
OK >>INSPECTION END
NG >> GO TO 4.
4.DETECT MALFUNCTIONING ITEM
• Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT-60,
"Symptom Chart" (Symptom No.58).
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.
In "N" Position, Vehicle MovesINFOID:0000000003532451
SYMPTOM:
Vehicle moves forward or backward when selecting “N” position.
DIAGNOSTIC PROCEDURE
1.CHECK PNP SWITCH CIRCUIT
Perform self-diagnosis. Refer to AT-83, "
CONSULT-II Function (A/T)".
Do the self-diagnostic results indicate PNP switch?
YES >> Check the malfunctioning system. Refer to AT- 9 9.
NO >> GO TO 2.
2.CHECK CONTROL CABLE
LCIA0345E
SCIA5199E

AT-170
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYMPTOMS
Check the control cable.
• Refer to AT-208, "
Checking of A/T Position".
OK or NG
OK >> GO TO 3.
NG >> Adjust control cable. Refer to AT-208, "
Adjustment of A/
T Position".
3.CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT-13, "
Checking Automatic Trans-
mission Fluid (ATF)".
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT-210, "
Control Valve with TCM and A/T Fluid Temperature Sensor 2".
2. Check A/T fluid condition. Refer to AT-13, "
Checking Automatic
Transmission Fluid (ATF)".
OK or NG
OK >> GO TO 5.
NG >> Check the malfunction items. If any items are damaged,
repair or replace damaged parts. Refer to AT-60, "
Symp-
tom Chart" (Symptom No.60).
5.CHECK SYMPTOM
Check again. Refer to AT-55, "
Check at Idle".
OK or NG
OK >>INSPECTION END
NG >> GO TO 6.
6.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT-82, "
TCM Input/Output Signal Reference
Va l u e".
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.
Large Shock ("N" to "D" Position)INFOID:0000000003532452
SYMPTOM:
A noticeable shock occurs when the selector lever is shifted from the “N” to “D” position.
LCIA0345E
SAT638A
SCIA5199E

TROUBLE DIAGNOSIS FOR SYMPTOMS
AT-171
< SERVICE INFORMATION >
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DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to AT-83, "
CONSULT-II Function (A/T)".
Do the self-diagnostic results indicate A/T fluid temperature sensor, engine speed signal, accelerator pedal
position sensor, ATF pressure switch 1, front brake solenoid valve, CAN communication line?
YES >> Check the malfunctioning system. Refer to AT- 11 9, AT-109, AT- 11 7' AT-150' AT-134' AT- 9 1.
NO >> GO TO 2.
2.ENGINE IDLE SPEED
Check the engine idle speed. Refer to EC-75, "
Idle Speed and Ignition Timing Check".
OK or NG
OK >> GO TO 3.
NG >> Repair.
3.CHECK CONTROL CABLE
Check the control cable.
• Refer to AT-208, "
Checking of A/T Position".
OK or NG
OK >> GO TO 4.
NG >> Adjust control cable. Refer to AT-208, "
Adjustment of A/
T Position".
4.CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to AT-13, "
Checking Automatic
Transmission Fluid (ATF)".
OK or NG
OK >> GO TO 5.
NG >> Refill ATF.
5.CHECK LINE PRESSURE
Check line pressure at idle with selector lever in “D” position. Refer
to AT-51, "
Inspections Before Trouble Diagnosis".
OK or NG
OK >> GO TO 8.
NG - 1 >> Line pressure high: GO TO 6.
NG - 2 >> Line pressure low: GO TO 7.
6.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT-210, "
Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to AT-240, "
Disassembly".
3. Check the following items:
LCIA0345E
SAT638A
SAT494G

AT-172
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYMPTOMS
- Oil pump assembly. Refer to AT-258, "Oil Pump".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
7.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to AT-210, "
Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
2. Disassemble A/T. Refer to AT-240, "
Disassembly".
3. Check the following items:
- Oil pump assembly. Refer to AT-258, "
Oil Pump".
- Power train system. Refer to AT-240, "
Disassembly".
- Transmission case. Refer to AT-240, "
Disassembly".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.
8.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT-210, "
Control Valve with TCM and A/T Fluid Temperature Sensor 2".
2. Check A/T fluid condition. Refer to AT-13, "
Checking Automatic
Transmission Fluid (ATF)".
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9.DETECT MALFUNCTIONING ITEM
• Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT-60,
"Symptom Chart" (Symptom No.1).
OK or NG
OK >> GO TO 10.
NG >> Repair or replace damaged parts.
10.CHECK SYMPTOM
Check again. Refer to AT-55, "
Check at Idle".
OK or NG
OK >>INSPECTION END
NG >> GO TO 11.
11 .PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT-82, "
TCM Input/Output Signal Reference
Va l u e".
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.
Vehicle Does Not Creep Backward in "R" PositionINFOID:0000000003532453
SYMPTOM:
The vehicle does not creep in the “R” position. Or an extreme lack of acceleration is observed.
DIAGNOSTIC PROCEDURE
SCIA5199E