2011 INFINITI QX56 engine

TM-156
< DTC/CIRCUIT DIAGNOSIS >[7AT: RE7R01B]
SHIFT POSITION INDICATOR CIRCUIT
SHIFT POSITION INDICATOR CIRCUIT
DescriptionINFOID:0000000006226879
TCM transmits a shift position signal to the combination meter via CAN communication line. While the vehicle
is running, the combination meter displays a shift position in the information display, according to this signal.
Refer to
MWI-9, "
METER SYSTEM : System Diagram".
Component Function CheckINFOID:0000000006226880
1.CHECK A/T INDICATOR
CAUTION:
Always drive vehicle at a safe speed.
1. Start the engine.
2. Check the actual selector lever position (“P”, “R”, “N” and “D”) and the indication of the shift position indi-
cator mutually coincide.
3. Drive vehicle in the manual mode, and then check that the actual gear position and the indication of the
shift position indicator mutually coincide when the sele ctor lever is shifted to “UP (+ side)” or “DOWN (−
side)” side (1GR ⇔ 7GR).
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to TM-156, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006226881
1.CHECK INPUT SIGNALS
With CONSULT-III
1. Start the engine.
2. Select “SLCT LVR POSI” in “Data Monitor” in “TRANSMISSION”.
3. Check the actual selector lever position (“P”, “R”, “N” and “D”) and the indication of the “SLCT LVR POSI”
mutually coincide. Refer to TM-68, "
Reference Value".
4. Drive vehicle in the manual mode, and then check that the actual gear position and the indication of the
“SLCT LVR POSI” mutually coincide when the selector lever is shifted to the “UP (+ side)” or “DOWN (−
side)” side (1GR ⇔ 7GR). Refer to TM-68, "
Reference Value".
Is the inspection result normal?
YES >> INSPECTION END
NO-1 [The actual gear position does not change, or sh ifting into the manual mode is not possible (no gear
shifting in the manual mode possible). Or the shift position indicator is not indicated.]>>Check manual
mode switch. Refer to TM-146, "
Component Inspection (Manual Mode Switch)".
 Check A/T main system (Fai l-safe function actuated).
- Perform “Self Diagnostic Results” in “TRANSMISSION”. Refer to TM-78, "
DTC Index".
NO-2 (The actual gear position changes, but the shift pos ition indicator is not indicated.)>>Perform “Self
Diagnostic Results” in “TRANSMISSION”. Refer to TM-78, "
DTC Index".
NO-3 (The actual gear position and the indication on t he shift position indicator do not coincide.)>>Perform
“Self Diagnostic Results” in “TRANSMISSION”. Refer to TM-78, "
DTC Index".
NO-4 (Only a specific position or positions is/are not indicated on the shift position indicator.)>>Check the
combination meter. Refer to MWI-35, "
Reference Value".
Revision: 2010 May2011 QX56

SYSTEM SYMPTOMTM-165
< SYMPTOM DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
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]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
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]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
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

TM-170
< SYMPTOM DIAGNOSIS >[7AT: RE7R01B]
SYSTEM SYMPTOM
*: Parts behind drum support is impossible to perform inspection by disassembly. Refer to
TM-16, "TRANSMISSION : Cross-Sectional
View".Symptom
Diagnostic item
Oil pump
Torque converter
Low brake*
Front brake
High and low reverse clutch
Input clutch
Direct clutch
2346 brake
Reverse brake
1st one-way clutch
2nd one-way clutch
gear
control valve
Parking component
TM-270
TM-211TM-211TM-211TM-292TM-282TM-294TM-270TM-211TM-211TM-287TM-211TM-182TM-211
Poor
perfor-
mance
Driving
perfor-
mance Shift point is high in “D” position.
Shift point is low in “D” position.
Large
shock
When
shifting
gears →
“D” position 1 2 2
→ “R” position 1 1 2
1GR ⇔ 2GR 1 2
2GR ⇔ 3GR 1 2
3GR ⇔ 4GR 2 1 2
4GR ⇔ 5GR 1 1 2
5GR ⇔ 6GR 1 1 2
6GR ⇔ 7GR 1 1 2
Downshift when accel-
erator pedal is de-
pressed 211111 11 2
Upshift when accelera-
tor pedal is released 211111 11 2
Lock-up 1 2
Judder Lock-up 1 2
Strange noise In “R” position 1 1 1 1 2
In “N” position 1 1 1 2
In “D” position 1 1 1 1 2
Engine at idle 1 1 1 2
Revision: 2010 May2011 QX56

SYSTEM SYMPTOMTM-173
< SYMPTOM DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
*: Parts behind drum support is impossible to perform inspection by disassembly. Refer to TM-16, "TRANSMISSION : Cross-Sectional
View".
Func-
tion
trouble
Poor
pow-
er
trans-
mis-
sion
Slip With selector lever
in “D” position, ac-
celeration is ex-
tremely poor.
112 1 12
With selector lever
in “R” position, ac-
celeration is ex-
tremely poor. 11 11112
While starting off
by accelerating in
1GR, engine rac-
es. 112 1112
While accelerating
in 2GR, engine
races. 1 2 1 112
While accelerating
in 3GR, engine
races. 1 2 11 12
While accelerating
in 4GR, engine
races. 1 1 11 12
While accelerating
in 5GR, engine
races. 1 111 12
While accelerating
in 6GR, engine
races. 111112
While accelerating
in 7GR, engine
races. 1 111 2
Lock-up 1 1 1 2
No creep at all. 11211111 11121
Extremely large
creep. 1
Symptom
Diagnostic item
Oil pump
Torque converter
Low brake*
Front brake
High and low reverse clutch
Input clutch
Direct clutch
2346 brake
Reverse brake
1st one-way clutch
2nd one-way clutch
gear
control valve
Parking component
TM-270
TM-211TM-211TM-211TM-292TM-282TM-294TM-270TM-211TM-211TM-287TM-211TM-182TM-211
Revision: 2010 May2011 QX56