2011 INFINITI QX56 brake sensor

TM-142
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
P1734 7GR INCORRECT RATIO
P1734 7GR INCORRECT RATIO
DescriptionINFOID:0000000006226861
This malfunction is detected when the A/T does not shift
into 7GR 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:0000000006226862
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
“ TM-143, "
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 “7TH GR FNCTN P1734” 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
P1734 Gear 7 Incorrect Ratio The gear ratio is:
 0.821 or more
 0.729 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

SYSTEM SYMPTOMTM-165
< SYMPTOM DIAGNOSIS > [7AT: RE7R01B]
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SYMPTOM DIAGNOSIS
SYSTEM SYMPTOM
Symptom TableINFOID:0000000006226890
 The diagnostics item numbers show the sequence for inspection. Inspect in order from item 1.
 Perform diagnoses of symptom table 1 before symptom table 2.
SYMPTOM TABLE 1
Symptom Diagnostic item
Control cable
Output speed sensor
Vehicle speed signal
Accelerator pedal position sensor
Engine speed signal
Input speed sensor
A/T fluid temperature sensor
Battery voltage
Transmission range switch
Manual mode switch
Stop lamp switch
Line pressure solenoid valve
Torque converter solenoid valve
Low brake solenoid valve
Front brake solenoid valve
High and low reverse clutch solenoid valve
Input clutch solenoid valve
Direct clutch solenoid valve
2346 brake solenoid valve
Anti-interlock solenoid valve
Starter relay
CAN communication
TM-101
TM-110TM-138TM-137TM-112TM-109TM-107TM-151TM-106TM-144TM-159TM-131TM-128TM-148TM-136TM-147TM-133TM-150TM-149TM-132TM-104TM-103
Poor
perfor-
mance
Driving
perfor-
manceShift point is high in “D” position. 1 2 3
Shift point is low in “D” position. 1 2
Large
shock
When
shifting
gears →
“D” position4 7665 32 31
→ “R” position 4 7 6 6 5 3 2 1
1GR ⇔ 2GR 4 2544 3 1
2GR ⇔ 3GR 4 2544 3 1
3GR ⇔ 4GR 4 2544 3 3 1
4GR ⇔ 5GR 4 2544 3 3 1
5GR ⇔ 6GR 4 2544 33 1
6GR ⇔ 7GR 4 2544 3 3 1
Downshift when
accelerator ped-
al is depressed 3 2433 1
Upshift when ac-
celerator pedal
is released 3 2433 1
Lock-up 4 2444 3 1
Judder Lock-up 2 1 1 4 3
Strange noise In “R” position 2 1
In “N” position 2 1
In “D” position 2 1
Engine at idle 2 1
Revision: 2010 May2011 QX56

TM-166
< SYMPTOM DIAGNOSIS >[7AT: RE7R01B]
SYSTEM SYMPTOM
SymptomDiagnostic item
Control cable
Output speed sensor
Vehicle speed signal
Accelerator pedal position sensor
Engine speed signal
Input speed sensor
A/T fluid temperature sensor
Battery voltage
Transmission range switch
Manual mode switch
Stop lamp switch
Line pressure solenoid valve
Torque converter solenoid valve
Low brake solenoid valve
Front brake solenoid valve
High and low reverse clutch solenoid valve
Input clutch solenoid valve
Direct clutch solenoid valve
2346 brake solenoid valve
Anti-interlock solenoid valve
Starter relay
CAN communication
TM-101
TM-110TM-138TM-137TM-112TM-109TM-107TM-151TM-106TM-144TM-159TM-131TM-128TM-148TM-136TM-147TM-133TM-150TM-149TM-132TM-104TM-103
Func-
tion
trouble
Gear
does no
change “D” position Locks in 1GR 1 1 1 1
Locks in 2GR
Locks in 3GR
Locks in 4GR
Locks in 5GR 1
Locks in 6GR
Locks in 7GR
1GR
→ 2GR 1 1 1 1
2GR → 3GR 1
3GR → 4GR 2 22 2222 1
4GR → 5GR 1 1
5GR → 6GR 1
6GR → 7GR 1 1 1 1 1
5GR → 4GR 1
4GR → 3GR 1 1 1
3GR → 2GR 1 1
2GR → 1GR 1 1 1
Does not lock-up 2 22245 32222222 2 2 1
“M” posi-
tion 1GR
⇔ 2GR 3 33 32 3333333 3 3 1
2GR ⇔ 3GR 3 33 32 3333333 3 3 1
3GR ⇔ 4GR 3 33 32 3333333 3 3 1
4GR ⇔ 5GR 3 33 32 3333333 3 3 1
5GR ⇔ 6GR 3 33 32 3333333 3 3 1
6GR ⇔ 7GR 3 33 32 3333333 3 3 1
Revision: 2010 May2011 QX56

SYSTEM SYMPTOMTM-167
< SYMPTOM DIAGNOSIS > [7AT: RE7R01B]
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Symptom Diagnostic item
Control cable
Output speed sensor
Vehicle speed signal
Accelerator pedal position sensor
Engine speed signal
Input speed sensor
A/T fluid temperature sensor
Battery voltage
Transmission range switch
Manual mode switch
Stop lamp switch
Line pressure solenoid valve
Torque converter clutch solenoid valve
Low brake solenoid valve
Front brake solenoid valve
High and low reverse clutch solenoid valve
Input clutch solenoid valve
Direct clutch solenoid valve
2346 brake solenoid valve
Anti-interlock solenoid valve
Starter relay
CAN communication
TM-101
TM-110TM-138TM-137TM-112TM-109TM-107TM-151TM-106TM-144TM-159TM-131TM-128TM-148TM-136TM-147TM-133TM-150TM-149TM-132TM-104TM-103
Func-
tion trou-
ble
Poor
shiftingSlip
When
shifting
gears1GR
⇔ 2GR 3 3 3 4 2 2 1
2GR ⇔ 3GR 3 3 3 4 2 2 1
3GR ⇔ 4GR 3 3 3 4 2 2 2 2 1
4GR ⇔ 5GR 3 3 3 4 2 2 2 1
5GR ⇔ 6GR 3 3 3 4 2 2 2 1
6GR ⇔ 7GR 3 3 3 4 2 2 2 1
Engine
brake
does
not
work “D” position
→ “M” posi-
tion 5556423 33 1
“M” po-
sition 7GR
→ 6GR 5 5 5 6 4 2 3 3 3 1
6GR → 5GR 5 5 5 6 4 2 3 3 3 1
5GR → 4GR 5 5 5 6 4 2 3 3 3 1
4GR → 3GR 5 5 5 6 4 2 3 3 3 3 1
3GR → 2GR 5 556423 33 1
2GR → 1GR 5 5 5 6 4 2 3 3 3 1
Revision: 2010 May2011 QX56

TM-168
< SYMPTOM DIAGNOSIS >[7AT: RE7R01B]
SYSTEM SYMPTOM
Func-
tion trou-
blePoor
power
trans-
mission
Slip With selector
lever in “D”
position, ac-
celeration is
extremely
poor.
53 334 2 2 2 1
With selector
lever in “R”
position, ac-
celeration is
extremely
poor. 53 334 2 2 2 1
While starting
off by acceler-
ating in 1GR,
engine races. 3 334 2 2 2 1
While acceler-
ating in 2GR,
engine races. 3 334 2 2 22 1
While acceler-
ating in 3GR,
engine races. 3 334 2 2 22 1
While acceler-
ating in 4GR,
engine races. 3 334 2 2 22 1
While acceler-
ating in 5GR,
engine races. 3 334 2 222 2 1
While acceler-
ating in 6GR,
engine races. 3 334 2 22221
While acceler-
ating in 7GR,
engine races. 3 334 2 2 22 2 1
Lock-up 3 334 2 2 1
No creep at
all. 111111111
Extremely
large creep. 1
Symptom
Diagnostic item
Control cable
Output speed sensor
Vehicle speed signal
Accelerator pedal position sensor
Engine speed signal
Input speed sensor
A/T fluid temperature sensor
Battery voltage
Transmission range switch
Manual mode switch
Stop lamp switch
Line pressure solenoid valve
Torque converter clutch solenoid valve
Low brake solenoid valve
Front brake solenoid valve
High and low reverse clutch solenoid valve
Input clutch solenoid valve
Direct clutch solenoid valve
2346 brake solenoid valve
Anti-interlock solenoid valve
Starter relay
CAN communication
TM-101
TM-110TM-138TM-137TM-112TM-109TM-107TM-151TM-106TM-144TM-159TM-131TM-128TM-148TM-136TM-147TM-133TM-150TM-149TM-132TM-104TM-103
Revision: 2010 May2011 QX56

SYSTEM SYMPTOMTM-169
< SYMPTOM DIAGNOSIS > [7AT: RE7R01B]
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SYMPTOM TABLE 2
Symptom Diagnostic item
Control cable
Output speed sensor
Vehicle speed signal
Accelerator pedal position sensor
Engine speed signal
Input speed sensor
A/T fluid temperature sensor
Battery voltage
Transmission range switch
Manual mode switch
Stop lamp switch
Line pressure solenoid valve
Torque converter clutch solenoid valve
Low brake solenoid valve
Front brake solenoid valve
High and low reverse clutch solenoid valve
Input clutch solenoid valve
Direct clutch solenoid valve
2346 brake solenoid valve
Anti-interlock solenoid valve
Starter relay
CAN communication
TM-101
TM-110TM-138TM-137TM-112TM-109TM-107TM-151TM-106TM-144TM-159TM-131TM-128TM-148TM-136TM-147TM-133TM-150TM-149TM-132TM-104TM-103
Function
trouble
Power transmis-
sion cannot be
performed Vehicle cannot run in all
position.
3 2 111111111
Driving is not possible in
“D” position. 3 2 111111111
Driving is not possible in
“R” position. 32111
Engine stall 4 5 5 6 3 2 1
Engine stalls when selec-
tor lever shifted “N” → “D”
or “R”. 455 3 2 1
Engine does not start in
“N” or “P” position. 312 1
Engine starts in position
other than “N” or “P”. 32 1
Poor operation Vehicle does not enter
parking condition.
12
Parking condition is not
cancelled. 12
Vehicle runs with A/T in
“P” position. 12
Vehicle moves forward
with the “R” position. 12
Vehicle runs with A/T in
“N” position. 12
Vehicle moves backward
with the “D” position. 12
Revision: 2010 May2011 QX56

TRANSMISSION ASSEMBLYTM-205
< UNIT REMOVAL AND INSTALLATION > [7AT: RE7R01B]
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UNIT REMOVAL AND INSTALLATION
TRANSMISSION ASSEMBLY
2WD
2WD : Exploded ViewINFOID:0000000006233263
2WD : Removal and InstallationINFOID:0000000006233264
REMOVAL
CAUTION:
 When removing the A/T assembly from engine, fi rst remove the crankshaft position sensor (POS)
from the A/T assembly.
 Be careful not to damage sensor edge.
1. Shift the selector lever to “P” position, and release the parking brake.
2. Disconnect the battery cabl e from the negative terminal.
3. Support A/T assembly with a transmission jack. CAUTION:
When setting the transmission jack, be careful not to allow it to collide against the drain plug and
overflow plug.
4. Remove rear engine mounting cross member.
5. Remove engine mounting insulator (rear).
6. Remove control cable from A/T assembly. Refer to TM-178, "
Removal and Installation".
7. Disconnect heated oxygen sensor 2 connectors (bank 1 and bank 2). Refer to EX-5, "
Exploded View".
1. A/T assembly 2. Front suspension rear cross mem-
ber3. Rear engine mounting cross
member
4. Engine mounting insulator (rear)
A. Tightening must be done following the installation procedure. Refer to TM-205, "
2WD : Removal and Installation".
Refer to GI-4, "
Components" for symbols in the figure.
JSDIA1856GB
Revision: 2010 May2011 QX56

TM-208
< UNIT REMOVAL AND INSTALLATION >[7AT: RE7R01B]
TRANSMISSION ASSEMBLY
4WD : Exploded View
INFOID:0000000006226910
4WD : Removal and InstallationINFOID:0000000006226911
REMOVAL
CAUTION:
 When removing the A/T assembly from engine, fi rst remove the crankshaft position sensor (POS)
from the A/T assembly.
 Be careful not to damage sensor edge.
1. Shift the selector lever to “P” pos ition, and release the parking brake.
2. Disconnect the battery cable from the negative terminal.
3. Remove control cable from A/T assembly. Refer to TM-178, "
Removal and Installation".
4. Disconnect heated oxygen sensor 2 connectors (bank 1 and bank 2). Refer to EX-5, "
Exploded View".
5. Remove exhaust front tube (RH and LH) and main muffler. Refer to EX-5, "
Exploded View".
6. Support A/T assembly with a transmission jack. CAUTION:
When setting the transmission jack, be careful not to allow it to collide against the drain plug and
overflow plug.
7. Remove rear engine mounting cross member and engine mounting insulator (rear).
8. Separate propeller shaft assembly (front). Refer to DLN-129, "
Removal and Installation".
9. Separate propeller shaft assembly (rear). Refer to DLN-137, "
Removal and Installation".
10. Remove front under cover with a power tool. Refer to EXT-25, "
Removal and Installation".
11. Remove front suspension rear cross member.
1. A/T assembly 2. Front suspension rear cross mem- ber3. Rear engine mounting cross
member
4. Engine mounting insulator (rear)
A. Tightening must be done following the installation procedure. Refer to TM-208, "
4WD : Removal and Installation".
Refer to GI-4, "
Components" for symbols in the figure.
JPDIA1156GB
Revision: 2010 May2011 QX56