2009 INFINITI QX56 relay

ST-8
< FUNCTION DIAGNOSIS >
HEATED STEERING WHEEL
Component Description
INFOID:0000000003775122
Heated steering wheel switch  Controls the heated steering relay and operates the heated steering system.
 Turns the indicator lamp ON when the system is activated.
Heated steering relay  Operates the heated steering system with the control signal from the heated steering
wheel switch.
Heated steering wheel  Heats the heating element with the power supplied from the heated steering relay.
Revision: December 20092009 QX56

STARTING SYSTEMSTR-9
< FUNCTION DIAGNOSIS >
C
DE
F
G H
I
J
K L
M A
STR
NP
O
Component DescriptionINFOID:0000000003771791
Component part
Description
TCM TCM supplies power to the starter relay inside the IPDM E/R when
the selector lever is shifted to the P or N position.
BCM BCM sends a starter request signal to the CPU of the IPDM E/R
over the CAN communication lines.
IPDM E/R CPU inside IPDM E/R operates the starter relay at the request of
the BCM over the CAN communication lines.
Starter motor The starter motor plunger closes and the motor is supplied with
battery power, which in turn cranks the engine, when the “S” ter-
minal is supplied with electric power.
Revision: December 20092009 QX56

TM-1
TRANSMISSION & DRIVELINE
CEF
G H
I
J
K L
M
SECTION TM
A
B
TM
N
O P
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
Diagnosis Procedure without CONSULT-III ............37
COMPONENT DIAGNOSIS .........................39
U1000 CAN COMM CIRCUIT ......................... ....39
Description .......................................................... ....39
On Board Diagnosis Logic ......................................39
Possible Cause .................................................... ....39
DTC Confirmation Procedure ..................................39
Diagnosis Procedure ...............................................39
P0615 STARTER RELAY .................................40
Description ...............................................................40
CONSULT-III Reference Value in Data Monitor
Mode ........................................................................
40
On Board Diagnosis Logic .......................................40
Possible Cause ........................................................40
DTC Confirmation Procedure ..................................40
Diagnosis Procedure ...............................................40
P0700 TRANSMISSION CONTROL .................43
Description ...............................................................43
On Board Diagnosis Logic .......................................43
Possible Cause ........................................................43
DTC Confirmation Procedure ..................................43
Diagnosis Procedure ...............................................43
P0705 TRANSMISSION RANGE SWITCH A ...44
Description ...............................................................44
CONSULT-III Reference Value in Data Monitor
Mode ........................................................................
44
On Board Diagnosis Logic .......................................44
Possible Cause ........................................................44
DTC Confirmation Procedure ..................................44
Diagnosis Procedure ...............................................44
P0717 INPUT SPEED SENSOR A ....................47
Description ...............................................................47
CONSULT-III Reference Value in Data Monitor
Mode ........................................................................
47
On Board Diagnosis Logic .......................................47
Possible Cause ........................................................47
DTC Confirmation Procedure ..................................47
Diagnosis Procedure ...............................................47
P0720 OUTPUT SPEED SENSOR ...................49
Description ...............................................................49
CONSULT-III Reference Value in Data Monitor
Mode ........................................................................
49
Revision: December 20092009 QX56

A/T CONTROL SYSTEMTM-21
< FUNCTION DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
CONTROL SYSTEM DIAGRAM
CAN CommunicationINFOID:0000000003771809
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication li ne for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to LAN-4,
"System Description".
SENSORS (or SIGNALS)
⇒TCM
⇒ACTUATORS
Transmission range switch
Accelerator pedal position sensor
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Output speed sensor
Vehicle speed signal
Stop lamp switch signal
Input speed sensor
1st position switch signal
4th position switch signal
ATF pressure switch 2 signal
Tow mode switch signal Shift control
Line pressure control
Lock-up control
Engine brake control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-III co
mmunication
line
Duet-EA control
CAN system Input clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High and low reverse clutch sole-
noid valve
Low coast brake solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
Starter relay
Back-up lamp relay
JSDIA1315GB
Revision: December 20092009 QX56

TM-22
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
Input/Output Signal of TCM
INFOID:0000000003771810
*1: Spare for output speed sensor.
*2: Spare for accelerator pedal position signal
*3: If these input and output signals are different, the TCM triggers the fail-safe function.
*4: CAN comm unications
*5: Used as a condition for starting self-diagnostics; if self-diagnostics are not started, it is judged that there is some kin d of error.
*6: A/T fluid temperature sensor 2 does not have any function.
Line Pressure ControlINFOID:0000000003771811
 When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the TCM controls the line pressure solenoid.
Control item Line
pres- sure
control Vehicle
speed
control S h i f t
control Lock-up
control Engine
brake
control Fail-safe
function (*3) Self-diag-
nostics
function
Input Accelerator pedal position signal
(*4)XXXXX X X
Output speed sensor X X X X X X
Vehicle speed signal
(*1) (*4)XXXX X
Closed throttle position signal
(*4)(*2) X (*2) X X (*2) X (*5) X
Wide open throttle position signal
(*4)(*2) X (*2) X (*2) X (*5) X
Input speed sensor 1 X X X X X
Input speed sensor 2
(for 4th speed only) XX X X X
Engine speed signals
(*4)XX
Transmission range switch X X X X X X X
Stop lamp switch signal
(*4)XXX (*5) X
A/T fluid temperature sensors 1, 2 (*6) X X X X X X X
ASCD Operation signal
(*4)XXXX
Overdrive cancel sig-
nal
(*4)XXX
TCM power supply voltage signal X X X X X X
Output Direct clutch solenoid X X X X
Input clutch solenoid X X X X
High and low reverse clutch solenoid X X X X
Front brake solenoid X X X X
Low coast brake solenoid (ATF pressure
switch 2)
XX X X X
Line pressure solenoid X X X X X X X
TCC solenoid X X X
Starter relay XX
Revision: December 20092009 QX56

TM-32
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (TCM)
DIAGNOSIS SYSTEM (TCM)
CONSULT-III Function (TRANSMISSION)INFOID:0000000004019470
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
SELF-DIAGNOSTIC RESULT MODE
Display Items List
X: Applicable, —: Not applicable
TCM diagnostic mode Description
Work Support This mode enables a technician to adjust some devices faster and more accurately.
Self-Diagnostic Results Retrieve DTC from ECU and display diagnostic items.
Data Monitor Monitor the input/output signal of the control unit in real time.
CAN Diagnosis Support Monitor It monitors the status of CAN communication.
DTC & SRT Confirmation The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
ECU Identification Display the ECU identification nu mber (part number etc.) of the selected system.
Items (CONSULT-III
screen terms) Malfunction is detected when... TCM self-di-
agnosis OBD (DTC)
Reference page
“TRANSMIS-
SION” with
CONSULT-III MIL indicator
lamp*1, “EN-
GINE” with
CONSULT-III or
GST
CAN COMM CIRCUIT  When a malfunction is detected in CAN communica-
tions U1000 U1000
TM-39
STARTER RELAY If this signal is ON other than in P or N position, this is
judged to be a malfunction.
(And if it is OFF in P or N position, this too is judged to
be a malfunction.) P0615 —
TM-40
TRANSMISSION
CONT TCM is malfunctioning. P0700 P0700
TM-43
T/M RANGE SWITCH A Transmission range switch 1-4 signals input with im-
possible pattern
 “P” position is detected from N position without any other position being detected in between. P0705 P0705
TM-44
INPUT SPEED SEN-
SOR A TCM does not receive the proper voltage signal from
the sensor.
 TCM detects an irregularity only at position of 4th gear for input speed sensor 2. P0717 P0717
TM-47
OUTPUT SPEED SEN-
SOR A Signal from vehicle speed sensor A/T (output speed
sensor) not input due to cut line or the like
 Unexpected signal input during running
 After ignition switch is turned ON, unexpected signal input from vehicle speed sensor MTR before the vehi-
cle starts moving P0720 P0720
TM-50
ENGINE SPEED TCM does not receive the CAN communication signal
from the ECM. P0725 —
TM-52
1GR INCORRECT RA-
TIO A/T cannot shift to 1st gear P0731 P0731
TM-55
2GR INCORRECT RA-
TIO A/T cannot shift to 2nd gear P0732 P0732
TM-57
3GR INCORRECT RA-
TIO A/T cannot shift to 3rd gear P0733 P0733
TM-59
Revision: December 20092009 QX56

TM-36
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (TCM)
DTC & SRT CONFIRMATION
DTC Work Support Mode
D POSI IND (ON-OFF display) — — X
4TH POSI IND (ON-OFF display) — — X
3RD POSI IND (ON-OFF display) — — X
2ND POSI IND (ON-OFF display) — — X
1ST POSI IND (ON-OFF display) — — X
MANU MODE IND (ON-OFF display) — — XNot mounted but displayed.
POWER M LAMP (ON-OFF display) — — X
F-SAFE IND/L (ON-OFF display) — — X
ATF WARN LAMP (ON-OFF display) — — X
BACK-UP LAMP (ON-OFF display) — — X
STARTER RELAY (ON-OFF display) — — X
RANGE SW3M (ON-OFF display) — — X
C/V CLB ID1 — — X
C/V CLB ID2 — — X
C/V CLB ID3 — — X
UNIT CLB ID1 — — X
UNIT CLB ID2 — — X
UNIT CLB ID3 — — X
TRGT GR RATIO — — X
TRGT PRES TCC (kPa) — — X
TRGT PRES L/P (kPa) — — X
TRGT PRES I/C (kPa) — — X
TRGT PRE FR/B (kPa) — — X
TRGT PRES D/C (kPa) — — X
TRG PRE HLR/C (kPa) — — X
SHIFT PATTERN — — X
DRV CST JUDGE — — X
START RLY MON — — X
NEXT GR POSI — — X
SHIFT MODE — — X
MANU GR POSI — — X
VEHICLE SPEED (km/h) — X X Vehicle speed recognized by the TCM.
Voltage (V) — — X Displays the value measured by the voltage
probe.
Frequency (Hz) — — X
The value measured by the pulse probe is dis-
played.
DUTY-HI (high) (%) — — X
DUTY-LOW (low) (%) — — X
PLS WIDTH-HI (ms) — — X
PLS WIDTH-LOW (ms) — — X Monitored item (Unit)
Monitor Item Selection
Remarks
ECU IN-
PUT SIG- NALS MAIN SIG-
NALS SELEC-
TION
FROM
MENU
Revision: December 20092009 QX56

TM-40
< COMPONENT DIAGNOSIS >
P0615 STARTER RELAY
P0615 STARTER RELAY
DescriptionINFOID:0000000003771830
 TCM prohibits cranking other than at “P” or “N” position.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000003771831
On Board Diagnosis LogicINFOID:0000000003771832
 This is not an OBD-II self-diagnostic item.
 Diagnostic trouble code “P0615” with CONSULT-III is det ected when starter relay is switched “ON” other
than at “P” or “N” position. (Or when sw itched “OFF” at “P” or “N” position).
Possible CauseINFOID:0000000003771833
 Harness or connectors
[The starter relay and TCM circuit is open or shorted.]
 Starter relay
DTC Confirmation ProcedureINFOID:0000000003771834
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine.
4. Drive vehicle for at least 2 consecutive seconds.
5. If DTC is detected, go to TM-40, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771835
1.CHECK STARTER RELAY
With CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III
and check monitor “STARTER RELAY” ON/OFF.
Without CONSULT-III
Item name Condition Display value
STARTER RELAY Selector lever in “N”,“P” position. ON
Selector lever in other position. OFF
Item name Condition Display value
STARTER RELAY Selector lever in "N'', "P'' positions. ON
Selector lever in other positions. OFF
Revision: December 20092009 QX56