INFINITI QX56 2006 Factory Service Manual

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-217
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Revision: November 2009 2006 QX56
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.17).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
7. CHECK SYMPTOM
Check again. Refer to AT- 5 8 , "
Cruise Test - Part 2" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 8.
8. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT- 8 3 , "
TCM Input/Output Signal Reference Val-
ues" .
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.
LCIA0345E
SCIA5199E

AT-218
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.17).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
Vehicle Does Not Decelerate By Engine BrakeECS00CKN
SYMPTOM:
No engine brake is applied when the gear is shifted from the 22 to 11 .
DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis.
Do the self-diagnosis results indicate PNP switch, ATF pressure switch 5?
YES >> Check the malfunctioning system. Refer to AT- 1 0 5 , "DTC P0705 PARK/NEUTRAL POSITION
SWITCH" , AT- 1 6 3 , "DTC P1845 ATF PRESSURE SWITCH 5" .
NO >> GO TO 2.
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" moving switch 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.
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

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-220
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: November 20092006 QX56
8. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT- 8 3 , "
TCM Input/Output Signal Reference Val-
ues" .
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.
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.53).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.

A/T SHIFT LOCK SYSTEMAT-221
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Revision: November 2009 2006 QX56
A/T SHIFT LOCK SYSTEMPFP:34950
DescriptionECS00ENU

The electrical key interlock mechanism also operates as a shift lock:
With the ignition switch turned to ON, the selector lever cannot be shifted from “P” (parking) to any other
position unless the brake pedal is depressed.
With the key removed, the selector lever cannot be shifted from “P” to any other position.
The key cannot be removed unless the selector lever is placed in “P”.

The shift lock and key interlock mechanisms are controlled by the ON-OFF operation of the shift lock sole-
noid and by the operation of the rotator and slider located inside the key cylinder, respectively.
Shift Lock System Electrical Parts LocationECS00ENV
LCIA0326E

AT-222
A/T SHIFT LOCK SYSTEM
Revision: November 20092006 QX56
Wiring Diagram — A/T — SHIFTECS00ENW
BCWA0502E

A/T SHIFT LOCK SYSTEMAT-223
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Revision: November 2009 2006 QX56
Shift Lock Control Unit Reference ValuesECS00ENX
SHIFT LOCK HARNESS CONNECTOR TERMINALS LAYOUT
SHIFT LOCK CONTROL UNIT INSPECTION TABLE
Data are reference values.
NOTE:
Confirm that the pointer swings only momentarily because the output time is so short. If the inspection is done with an oscillo scope, it
should be observed that the power source voltage lasts for 3.5 to 10 ms.
WCIA0550E
TER-
MINAL NO. WIRE
COLOR ITEM
CONDITION VOLTAGE
(Approx.)
1Y/RPower source Ignition switch:
“ON ” Battery voltage
Ignition switch: “OFF ” Battery voltage
2L/R Detention switch (for
key) When selector lever is not in "P" position with key inserted. Battery voltage
Except the above
0V
3GR Detention switch (for
shift) When selector lever is not in "P" position
Battery voltage
Except the above 0V
4 R/G Stop lamp switch When brake pedal is depressed
Battery voltage
When brake pedal is released 0V
5 W/R Vehicle speed signal ——
6 G/R Ignition signal Ignition switch:
“OFF ” 0V
Ignition switch: “ON ” Battery voltage
7 R/W Shift lock solenoid When brake pedal is depressed with ignition switch "ON". 0V
When brake pedal is depressed.
Battery voltage
8 B Ground Always0V
9 G/W Key lock solenoid When the selector lever is set to a position other than the “
P”
position, and the key switch is turned from “ON ” to “OFF ” Battery voltage for
approx. 0.1 sec.
(Note)
Except the above 0V
10 W/G Key unlock solenoid When ignition switch is not in "ON
” position with key inserted. Battery voltage for
approx. 0.1 sec.
(Note)
Except the above 0V

AT-224
A/T SHIFT LOCK SYSTEM
Revision: November 20092006 QX56
Component InspectionECS00ENY
SHIFT LOCK SOLENOID

Check operation by applying battery voltage to A/T device termi-
nal 9 and ground to terminal 10.
CAUTION:
Be sure to apply the voltage of the correct polarity to the
respective terminals. Otherwise, the part may be damaged.
DETENTION SWITCH
For key:

Check continuity between terminals of the A/T device.
DETENTION SWITCH
For shift:

Check continuity between terminals of the A/T device.
KEY LOCK SOLENOID
Key lock

Check operation by applying battery voltage to key switch and
key lock solenoid terminal 1 and ground to terminal 2.
CAUTION:
Be careful not to cause burnout of the harness.
LCIA0328E
Condition Terminal No. Continuity
When selector lever is “ P” position.
5 - 6No
When selector lever is not “P ” position. Yes
LIIA1599E
ConditionTerminal No. Continuity
When selector lever is “P ” position.
3 - 4No
When selector lever is not “P ” position. Yes
WCIA0401E
WCIA0240E

A/T SHIFT LOCK SYSTEMAT-225
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Revision: November 2009 2006 QX56
Key unlock

Check operation by applying battery voltage to key switch and
key lock solenoid terminal 2 and ground to terminal 1.
CAUTION:
Be careful not to cause burnout of the harness.
KEY SWITCH

Check continuity between terminals of the key switch and key
lock solenoid.
STOP LAMP SWITCH

Check continuity between terminals of the stop lamp switch har-
ness connector.
Check stop lamp switch after adjusting brake pedal.
WCIA0241E
Condition Terminal No. Continuity
Key inserted 3 - 4Ye s
Key withdrawn No
SCIA5662E
ConditionTerminal No. Continuity
When brake pedal is depressed 3 - 4Ye s
When brake pedal is released No
WCIA0559E