2008 INFINITI QX56 transmission

SN
SONAR CONTROL UNIT FOR REAR SONAR SYSTEMSN-21
< ECU DIAGNOSIS >
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ECU DIAGNOSIS
SONAR CONTROL UNIT FO R REAR SONAR SYSTEM
Reference ValueINFOID:0000000001754070
SONAR CONTROL UNIT TERMINAL LAYOUT
TERMINALS AND REFERENCE VA LUES FOR SONAR CONTROL UNIT
WKIA5222E
Te r m i n a l
(wire color) Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation
3 (R) Sonar buzzer return ON —0 - 12 (variable)
4 (BR/Y) Sonar system OFF
indicator output ON
Sonar system OFF
switch ON
0
OFF Battery voltage
5 (G/W) Reverse signal ONTransmission gear se-
lector lever
R position
Battery voltage
Transmission gear se-
lector lever Not R position
0
6 (B) Sonar control unit
ground ——
0
7 (L) Sonar buzzer drive
signal
ON
— Battery voltage
8 (G/R) Sonar control unit
power ON
— Battery voltage
9 (GR) Rear sonar sensor
signal - RH outer
ON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstacles Battery voltage
10 (P) Rear sonar sensor
signal - LH outer
ON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstacles Battery voltage
11 ( O ) Rear sonar sensor
signal - LH inner
ON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• Distance obstacles Battery voltage
12 (LG) Rear sonar sensor
signal - RH inner
ON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• Distance obstacles Battery voltage
13 (LG) Sonar system OFF
switch signal
ONSonar system OFF
switch ON
0
OFF Battery voltage
Revision: March 2010 2008 QX56

SN
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEMSN-31
< ECU DIAGNOSIS >
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SONAR CONTROL UNIT FOR FR ONT AND REAR SONAR SYSTEM
Reference ValueINFOID:0000000001754073
SONAR CONTROL UNIT HARNESS TERMINAL LAYOUT
TERMINALS AND REFERENCE VA LUES FOR SONAR CONTROL UNIT
ALNIA0395ZZ
Te r m i n a l
(color) Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation
1 (G/R) Sonar control unit
power ON
— Battery voltage
2 (L) Sonar buzzer drive
signal
ON Object sensed
Battery voltage
3 (G/W) Reverse signal ONTransmission gear selector lever in R posi-
tion
Battery voltage
Transmission gear selector lever not in R
position 0
4 (B) Sonar control unit
ground ——
—
5 (BR/Y) Sonar system OFF
indicator output ON
Sonar system OFF
switch ON
0
OFF Battery voltage
6 (R) Rear sonar buzzer
return
ON
— 0 - 12 (variable)
8 (G/W) K-line ON— —
9 (LG/B) Rear sonar sensor
power ON Ignition switch ON
Battery voltage
11 ( L G ) Sonar system OFF
switch signal
ONSonar system OFF
switch ON
0
OFF Battery voltage
12 (Y) Rear sonar sensor
ground ON
— —
13 (LG) Rear sonar sensor
signal - RH inner ON• Sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• Distance obstacles Battery voltage
14 (O) Rear sonar sensor
signal - LH inner ON• Sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• Distance obstacles Battery voltage
15 (P) Rear sonar sensor
signal - LH outer ON• Sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstacles Battery voltage
Revision: March 2010
2008 QX56

SN-32
< ECU DIAGNOSIS >
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEM
16 (GR)Rear sonar sensor
signal - RH outer ON• Sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstacles Battery voltage
17 (LG/B) Front sonar sensor
power
ON Ignition switch ON
Battery voltage
18 (GR/R) Park position signal ON Vehicle in PARK 12
19 (GR) Front sonar sensor
signal - RH outer ON• Sonar system OFF switch ON
• Transmission gear selector lever in a for-
ward drive gear
• Distance obstacles Battery voltage
20 (LG) Front sonar sensor
signal - RH inner ON• Sonar system OFF switch ON
• Transmission gear selector lever in re-
verse or a forward drive gear
• No obstacles Battery voltage
21 (W/R) Vehicle speed signal ON Speedometer operated
[When vehicle speed is approx. 40 km/h (25
MPH)]NOTE:
Maximum voltage may be 12V due
to specifications (connected units).
23 (R) Front sonar buzzer
return ON
— 0 - 12 (variable)
24 (P) Front sonar sensor
signal - LH outer
ON• Sonar system OFF switch ON
• Transmission gear selector lever in re-
verse or a forward drive gear
• No obstacles Battery voltage
25 (O) Front sonar sensor
signal - LH inner
ON• Sonar system OFF switch ON
• Transmission gear selector lever in a for-
ward drive gear
• Distance obstacles Battery voltage
26 (Y) Front sonar sensor
ground ON
— —
Te r m i n a l
(color) Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation
PKIC0643E
Revision: March 2010
2008 QX56

SN
SONAR SYSTEM SYMPTOMSSN-45
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
SONAR SYSTEM SYMPTOMS
Symptom TableINFOID:0000000001754076
Symptom Repair order
When the sonar system is OFF, the OFF indicator does not light
and the sonar buzzer does not sound. 1. Check sonar system OFF switch. Refer to
SN-19, "
Diagno-
sis Procedure (With Rear Sonar System)" or SN-19, "Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Check harness and connections for sonar system OFF
switch.
3. Replace sonar control unit. Refer to SN-50, "
Removal and
Installation".
When the sonar system is OFF, the OFF indicator lamp does not
light but the sonar buzzer does sound. 1. Check sonar system OFF switch. Refer to
SN-19, "
Diagno-
sis Procedure (With Rear Sonar System)" or SN-19, "Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Check harness and connections for sonar system OFF indi- cator lamp.
3. Replace sonar control unit.
When the sonar system is OFF, the sonar buzzer does not sound
but the OFF indicator lamp lights. 1. Check sonar buzzer. Refer to
SN-17, "
Diagnosis Procedure
(With Rear Sonar System)" or SN-17, "Diagnosis Procedure
(With Front and Rear Sonar System)".
2. Check harness and connections between sonar buzzer and sonar control unit.
3. Replace sonar control unit.
When sonar system is ON, the sonar system OFF indicator lamp
lights up and the sonar buzzer sounds intermittently (for about 4
seconds). (Rear sonar system only) 1. Check harnesses between sonar sensors and sonar control
unit for an open condition.
2. Check sonar sensors. Refer to SN-5, "
Preliminary Check".
3. Replace sonar control unit.
The sonar system still operates when the sonar system is OFF. 1. Replace sonar control unit.
When the transmission gear selector lever is in the R position and
the sonar system is ON, the rear sonar system does not operate. 1. Check transmission range switch. Refer to
TM-43, "
Diagno-
sis Procedure".
2. Check back-up lamp relay.
3. Check related harness and connections for back-up lamp re- lay.
4. Replace sonar control unit.
When the transmission gear selector lever is in a forward drive
gear and the sonar system is ON, the front sonar system does not
operate. (With front and rear sonar system only) 1. Check harness and connections between sonar control unit
and combination meter.
2. Replace sonar control unit.
Sonar system OFF indicator lamp lights up and buzzer sounds al-
though there are no obstacles within the detection range. 1. Check sonar sensors.
2. Check harness and connections between sonar sensors
and sonar control unit.
3. Replace sonar control unit.
The sonar sensors do not detect objects in the detectable range. 1. Check sonar sensors.
2. Replace sonar control unit.
Revision: March 2010
2008 QX56

STR-10
< COMPONENT DIAGNOSIS >
B TERMINAL CIRCUIT
COMPONENT DIAGNOSIS
B TERMINAL CIRCUIT
DescriptionINFOID:0000000001696228
Terminal "2" (B) is constantly supplied with battery power.
Diagnosis ProcedureINFOID:0000000001696229
CAUTION:
Perform diagnosis under the condition that the engine cannot start by the following procedure.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is depleted.
1.CHECK TERMINAL 2 POWER SUPPLY VOLTAGE
1. Turn ignition switch OFF.
2. Make sure that starter motor connector F27 terminal 2 connection is clean and tight.
3. Check voltage between starter motor connector F27 terminal 2
and ground.
Is there battery voltage present?
YES >> GO TO 2
NO >> Check harness between battery and starter motor for open circuit.
2.CHECK BATTERY CABLE (VOLTAGE DROP TEST)
1. Shift the transmission into park or neutral.
2. Check voltage between battery positive terminal and starter motor connector F27 terminal 2 while cranking the engine.
Is the voltage drop less than 0.2V?
YES >> GO TO 3
NO >> Check harness between the battery and the starter motor for high resistance.
3.CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
Check voltage between starter motor case and battery negative ter-
minal while cranking the engine.
Is the voltage drop less than 0.2V?
YES >> Terminal 2 circuit is OK. Further inspection necessary. Refer to STR-5, "
Work Flow".
NO >> Check the starter motor case to engine mounting for
high resistance.
(+) (-) Voltage
Connector Terminal
F27 2 Ground Battery voltage
AWBIA0122GB
(-) (+) Condition Voltage
Connector Terminal
F27 2 Battery (+)
terminal While cranking the
engine Less than 0.2V
AWBIA0123GB
(+)
(-)Condition Voltage
Starter motor case Battery (-) terminal While cranking the
engine Less than 0.2V
AWBIA0124GB
Revision: March 2010
2008 QX56

S CONNECTOR CIRCUITSTR-11
< COMPONENT DIAGNOSIS >
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STR
NP
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S CONNECTOR CIRCUIT
DescriptionINFOID:0000000001696230
Terminal "1" (S) is the power supply for the starter mo
tor magnetic switch. Terminal 1 is supplied with power
when the ignition switch is turned to the START position while the selector lever is in the P or N position.
Diagnosis ProcedureINFOID:0000000001696231
CAUTION:
Perform diagnosis under the cond ition that engine cannot start by the following procedure.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possi ble) until the fuel pressure is released.
1.CHECK STARTER MOTOR MAGNETIC SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect starter motor connector F28.
3. Shift transmission into park or neutral.
4. Check voltage between starter motor harness connector F28 terminal 1 and ground with the ignition in START.
Is battery voltage present?
YES >> Magnetic switch circuit is OK. Further inspection necessary. Refer to STR-5, "Work Flow".
NO >> GO TO 2
2.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Check the IPDM E/R harness connector E120 and starter motor harness connector F28 for damage, bent pins and loose connections.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair the terminal and connector.
3.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect IPDM E/R connector E120 and starter motor con- nector F28.
2. Check continuity between starter motor harness connector F28 (A) terminal 1 and IPDM E/R harness connector E120 (B) termi-
nal 19.
3. Check continuity between starter motor harness connector F28 (A) terminal 1 and ground.
Are the continuity test results as specified?
YES >> Further inspection necessary. Refer to STR-5, "Work Flow".
NO >> Repair the harness.
(+) (-)Condition Voltage
Connector Terminal
F28 1 Ground While cranking the
engine Battery voltage
AWBIA0125GB
AB
Continiuty
Connector Terminal Connector Terminal
F28 1E120 19 Yes
A —Continiuty
Connector Terminal
F28 1Ground No
AWBIA0126GB
Revision: March 2010 2008 QX56

TM-1
TRANSMISSION & DRIVELINE
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SECTION TM
A
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TM
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CONTENTS
TRANSAXLE & TRANSMISSION
BASIC INSPECTION ....... .............................5
DIAGNOSIS AND REPAIR WORKFLOW ..... .....5
Work Flow ........................................................... ......5
Diagnostic Work Sheet ..............................................6
FUNCTION DIAGNOSIS ...............................8
A/T CONTROL SYSTEM ................................ .....8
Cross-Sectional View (2WD models) .................. ......8
Cross-Sectional View (4WD models) ........................9
Shift Mechanism ........................................................9
TCM Function ..........................................................20
CAN Communication ...............................................21
Input/Output Signal of TCM .....................................22
Line Pressure Control .............................................22
Shift Control ........................................................ ....24
Lock-up Control .......................................................25
Engine Brake Control ..............................................26
Control Valve ...........................................................26
Component Parts Location ......................................28
A/T SHIFT LOCK SYSTEM ............................ ....29
System Description ............................................. ....29
Component Parts Location ......................................29
ON BOARD DIAGNOSTIC (OBD) SYSTEM ......30
Introduction ......................................................... ....30
OBD-II Function for A/T System ..............................30
One or Two Trip Detection Logic of OBD-II ............30
OBD-II Diagnostic Trouble Code (DTC) ..................30
Malfunction Indicator Lamp (MIL) ............................31
DIAGNOSIS SYSTEM (TCM) .............................32
CONSULT-III Function (TRANSMISSION) ......... ....32
COMPONENT DIAGNOSIS .........................38
U1000 CAN COMM CI RCUIT .............................38
Description .......................................................... ....38
On Board Diagnosis Logic ......................................38
Possible Cause .......................................................38
DTC Confirmation Procedure .............................. ....38
Diagnosis Procedure ...............................................38
P0615 STARTER RELAY .................................39
Description ...............................................................39
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
39
On Board Diagnosis Logic .......................................39
Possible Cause ........................................................39
DTC Confirmation Procedure ..................................39
Diagnosis Procedure ...............................................39
P0700 TRANSMISSION CONTROL .................42
Description ...............................................................42
On Board Diagnosis Logic .......................................42
Possible Cause ........................................................42
DTC Confirmation Procedure ..................................42
Diagnosis Procedure ...............................................42
P0705 TRANSMISSION RANGE SWITCH A ...43
Description ...............................................................43
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
43
On Board Diagnosis Logic .......................................43
Possible Cause ........................................................43
DTC Confirmation Procedure ..................................43
Diagnosis Procedure ...............................................43
P0717 INPUT SPEED SENSOR A ....................46
Description ...............................................................46
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
46
On Board Diagnosis Logic .......................................46
Possible Cause ........................................................46
DTC Confirmation Procedure ..................................46
Diagnosis Procedure ...............................................46
P0720 OUTPUT SPEED SENSOR ...................48
Description ...............................................................48
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
48
On Board Diagnosis Logic .......................................48
Revision: March 2010 2008 QX56

TM-2
Possible Cause .......................................................48
DTC Confirmation Procedure .................................48
Diagnosis Procedure ..............................................49
P0725 ENGINE SPEED .....................................51
Description ........................................................... ...51
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ...
51
On Board Diagnosis Logic ......................................51
Possible Cause .......................................................51
DTC Confirmation Procedure .................................51
Diagnosis Procedure ..............................................51
P0731 1GR INCORRECT RATIO ......................53
Description ........................................................... ...53
On Board Diagnosis Logic ......................................53
Possible Cause .......................................................53
DTC Confirmation Procedure .................................53
Diagnosis Procedure ..............................................54
P0732 2GR INCORRECT RATIO ......................55
Description ........................................................... ...55
On Board Diagnosis Logic ......................................55
Possible Cause .......................................................55
DTC Confirmation Procedure .................................55
Diagnosis Procedure ..............................................56
P0733 3GR INCORRECT RATIO ......................57
Description ........................................................... ...57
On Board Diagnosis Logic ......................................57
Possible Cause .......................................................57
DTC Confirmation Procedure .................................57
Diagnosis Procedure ..............................................58
P0734 4GR INCORRECT RATIO ......................59
Description ........................................................... ...59
On Board Diagnosis Logic ......................................59
Possible Cause .......................................................59
DTC Confirmation Procedure .................................59
Diagnosis Procedure ..............................................60
P0735 5GR INCORRECT RATIO ......................61
Description ........................................................... ...61
On Board Diagnosis Logic ......................................61
Possible Cause .......................................................61
DTC Confirmation Procedure .................................61
Diagnosis Procedure ..............................................62
P0740 TORQUE CONVERTER .........................63
Description ........................................................... ...63
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ...
63
On Board Diagnosis Logic ......................................63
Possible Cause .......................................................63
DTC Confirmation Procedure .................................63
Diagnosis Procedure ..............................................63
P0744 TORQUE CONVERTER .........................65
Description ........................................................... ...65
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ...
65
On Board Diagnosis Logic ................................... ...65
Possible Cause .......................................................65
DTC Confirmation Procedure ..................................65
Diagnosis Procedure ...............................................66
P0745 PRESSURE CONTROL SOLENOID A ...67
Description ........................................................... ...67
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ...
67
On Board Diagnosis Logic ......................................67
Possible Cause .......................................................67
DTC Confirmation Procedure ..................................67
Diagnosis Procedure ...............................................67
P1705 TP SENSOR ...........................................69
Description ..............................................................69
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ...
69
On Board Diagnosis Logic ......................................69
Possible Cause .......................................................69
DTC Confirmation Procedure ..................................69
Diagnosis Procedure ...............................................69
P1710 TRANSMISSION FLUID TEMPERA-
TURE SENSOR .................................................
71
Description ........................................................... ...71
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ...
71
On Board Diagnosis Logic ......................................71
Possible Cause .......................................................71
DTC Confirmation Procedure ..................................71
Diagnosis Procedure ...............................................71
Component Inspection ............................................73
P1721 VEHICLE SPEED SIGNAL ....................74
Description ..............................................................74
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ...
74
On Board Diagnosis Logic ......................................74
Possible Cause .......................................................74
DTC Confirmation Procedure ..................................74
Diagnosis Procedure ...............................................74
P1730 INTERLOCK ...........................................76
Description ..............................................................76
On Board Diagnosis Logic ......................................76
Possible Cause .......................................................76
DTC Confirmation Procedure ..................................76
Judgement of Interlock ............................................76
Diagnosis Procedure ............................................ ...76
P1731 1ST ENGINE BRAKING .........................78
Description ........................................................... ...78
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ...
78
On Board Diagnosis Logic ......................................78
Possible Cause .......................................................78
DTC Confirmation Procedure ..................................78
Diagnosis Procedure ...............................................78
Revision: March 2010 2008 QX56