2006 INFINITI QX56 automatic transmission

TROUBLE DIAGNOSIS FOR SYMPTOMSAT-199
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Revision: November 2009 2006 QX56
P1705 THROTTLE POSITION SENSOR" , AT- 111 , "DTC P0720 VEHICLE SPEED SENSOR A/T
(REVOLUTION SENSOR)" , AT- 1 3 2 , "DTC P1721 VEHICLE SPEED SENSOR MTR" .
NO >> GO TO 3.
3. CHECK A/T FLUID LEVEL
Check A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic Trans-
mission 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 AT- 5 2 , "
LINE
PRESSURE TEST" .
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 AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "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 AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sen-
sor 2" .
2. Disassemble A/T. Refer to AT- 2 6 4 , "
Disassembly" .
3. Check the following items:
–Oil pump assembly. Refer to AT- 2 8 2 , "Oil Pump" .
–Power train system. Refer to AT- 2 6 4 , "Disassembly" .
–Transmission case. Refer to AT- 2 6 4 , "Disassembly" .
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
SAT638A
SAT494G

AT-210
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
2. CHECK 4TH POSITION SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch “ ON”.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Read out "OD CONT SW" switch moving selector lever to each position.
Without CONSULT-II
1. Turn ignition switch “ ON”. (Do not start engine)
2. Check voltage between A/T device harness connector terminal and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic
Transmission Fluid (ATF)" .
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
Monitor item Condition Display value
OD CONT SW When setting the selector
lever to "4" and "3" posi-
tion.
ON
When setting selector
lever to other positions. OFF
LCIA0339E
Item Connector No. Terminal No. Condition Data
(Approx.)
4th position switch M203 1 - Ground When setting
the selector
lever to "4"
and "3" posi-
tion.
0V
When setting
selector lever
to other posi-
tions. Battery volt-
age
LCIA0340E
SAT638A

AT-212
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
9. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT- 6 1 ,
"Symptom Chart" (Symptom No.14).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
A/T Does Not Shift: 4th gear → 3rd gearECS00CKK
SYMPTOM:
When shifted from 44 to 33 position, does not downshift from 4th to 3rd gears.
DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis. Refer to AT- 8 6 , "
SELF-DIAGNOSTIC RESULT MODE" .
Do the self-diagnosis results indicate PNP switch, ATF pressure switch 1, ATF pressure switch 3?
YES >> Check the malfunctioning system. Refer to AT- 1 0 5 , "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" , AT- 1 5 9 , "DTC P1841 ATF PRESSURE SWITCH 1" , AT- 1 6 1 , "DTC P1843 ATF PRES-
SURE SWITCH 3" .
NO >> GO TO 2.
2. CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic
Transmission Fluid (ATF)" .
OK or NG
OK >> GO TO 3.
NG >> Refill ATF.
3. CHECK CONTROL CABLE
Check the control cable.

Refer to AT- 2 2 7 , "Checking of A/T Position" .
OK or NG
OK >> GO TO 4.
NG >> Adjust control cable. Refer to AT- 2 2 7 , "
Adjustment of A/
T Position" .
SAT638A
LCIA0345E

AT-214
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis. Refer to AT- 8 6 , "
SELF-DIAGNOSTIC RESULT MODE" .
Do the self-diagnosis results indicate PNP switch, ATF pressure switch 6?
YES >> Check the malfunctioning system. Refer to AT- 1 0 5 , "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" , AT- 1 6 5 , "DTC P1846 ATF PRESSURE SWITCH 6" .
NO >> GO TO 2.
2. CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic
Transmission Fluid (ATF)" .
OK or NG
OK >> GO TO 3.
NG >> Refill ATF.
3. CHECK CONTROL CABLE
Check the control cable.

Refer to AT- 2 2 7 , "Checking of A/T Position" .
OK or NG
OK >> GO TO 4.
NG >> Adjust control cable. Refer to AT- 2 2 7 , "
Adjustment of A/
T Position" .
4. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT- 5 1 , "
Fluid Condition
Check" .
OK or NG
OK >> GO TO 5.
NG >> GO TO 8.
5. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT- 6 1 ,
"Symptom Chart" (Symptom No.16).
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
SAT638A
LCIA0345E
SCIA5199E

AT-216
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
2. CHECK 1ST POSITION SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch “ ON”.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Read out "1 POSITION SW" switch moving selector lever to each position.
Without CONSULT-II
1. Turn ignition switch “ ON”. (Do not start engine)
2. Check voltage between A/T device harness connector terminal and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic
Transmission Fluid (ATF)" .
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
Monitor item Condition Display value
1 POSITION SW When setting the selector
lever to "1" position.
ON
When setting selector
lever to other positions. OFF
LCIA0339E
Item Connector No. Terminal No. Condition Data
(Approx.)
1st position switch M203 7 - Ground When setting
the selector
lever to "1"
position.
0V
When setting
selector lever
to other posi-
tions. Battery volt-
age
LCIA0341E
SAT638A

TROUBLE DIAGNOSIS FOR SYMPTOMSAT-219
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Revision: November 2009 2006 QX56
3. CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to AT- 1 2 , "
Checking Automatic
Transmission Fluid (ATF)" .
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4. CHECK CONTROL CABLE
Check the control cable.

Refer to AT- 2 2 7 , "Checking of A/T Position" .
OK or NG
OK >> GO TO 5.
NG >> Adjust control cable. Refer to AT- 2 2 7 , "
Adjustment of A/
T Position" .
5. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature Sensor 2" .
2. Check A/T fluid condition. Refer to AT- 5 1 , "
Fluid Condition
Check" .
OK or NG
OK >> GO TO 6.
NG >> GO TO 9.
6. DETECT MALFUNCTIONING ITEM

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to AT- 6 1 ,
"Symptom Chart" (Symptom No.53).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
7. CHECK SYMPTOM
Check again. Refer to AT- 5 9 , "
Cruise Test - Part 3" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 8.
SAT638A
LCIA0345E
SCIA5199E

AT-228
ON-VEHICLE SERVICE
Revision: November 20092006 QX56
ON-VEHICLE SERVICEPFP:00000
Oil PanECS00EPZ
REMOVAL AND INSTALLATION
Removal
1. Drain A/T fluid. Refer to AT- 1 2 , "Changing Automatic Transmission Fluid (ATF)" .
2. Remove oil pan and gasket.
3. Check foreign materials in oil pan to help determine cause of malfunction. If the A/T fluid is very dark, has some burned smell, or contains foreign particles, friction material (clutches, band) may need replacement.
A tacky film that will not wipe clean indicates varnish build up. Varnish can cause valves, servo, and
clutches to stick and can inhibit pump pressure.
CAUTION:
If friction material is detected, flush the transmission cooler after repair. Refer to AT- 1 4 , "
A/T Fluid
Cooler Cleaning" .
4. Remove magnets from oil pan.
Installation
1. Install the oil pan magnets as shown.
SCIA2308E
SCIA5200E
SCIA5200E

ON-VEHICLE SERVICEAT-229
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Revision: November 2009 2006 QX56
2. Install the oil pan and new oil pan gasket.
CAUTION:

Do not reuse the oil pan gasket.

Completely remove all moisture, oil and old gasket from
the oil pan gasket mating surfaces and holes.

Always replace the oil pan bolts as they are self-sealing.

Be sure the oil pan drain plug hole is located to the rear
of the transmission assembly.

Partially install the oil pan bolts in a criss-cross pattern to
prevent dislocation of the gasket.

Be careful not to pinch harnesses.
3. Tighten new oil pan bolts in numerical order as shown.
4. Install drain plug in oil pan with new gasket. CAUTION:
Do not reuse the drain plug gasket.
5. Refill the transmission assembly with fluid. Refer to AT- 1 2 , "
Changing Automatic Transmission Fluid
(ATF)" .
SCIA2308E
Oil pan bolts : 7.9 N·m (0.81 kg-m, 70 in-lb)
SCIA4113E
Drain plug : 34 N·m (3.5 kg-m, 25 ft-lb)