Infiniti QX56 (Z62). Manual — part 1286
SYSTEM
TM-53
< SYSTEM DESCRIPTION >
[7AT: RE7R01B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Input/Output Signal Chart
*: This signal is transmitted via communication line.
The TCM activates low brake solenoid valve and controls the low brake oil pressure to the low pressure level
if the driver does not intend to start the vehicle while the vehicle is being stopped in the “D” position. Therefore,
the low brake is in the release (slip) status and the power transmission route of A/T is the same status as the
“N” position. This can decrease the engine load and improves the fuel economy because the drive force of
engine is not transmitted to the output shaft of A/T.
Idle Neutral Control Start Condition
Idle neutral control starts when all of the following conditions are satisfied. However, the control ends when
any one of the following conditions becomes insufficient during idle neutral control.
NOTE:
The idle neutral control is terminated or prohibited when the TCM and ECM detect that the vehicle is in any of
the conditions as per the following.
• Engine cooling water temperature and A/T fluid temperature are below or above a prescribed temperature.
• A/T malfunction occurs.
• DTC is detected.
• Fail-safe mode activates.
• Idle neutral control is performed continuously for a certain period of time.
Idle Neutral Control Resume Condition
Idle neutral control can be resumed when its start condition is fulfilled after any of the following operations is
performed (unless a malfunction occurs in the vehicle).
• After driving at more than a prescribed speed.
• When idle neutral control start conditions are fulfilled for a certain period of time.
SHIFT PATTERN CONTROL
Item
Signal
TCM function
Actuator
Each sensor, switch and
control unit
⇒
TCM
TCM
⇒
ECM
ECM
⇒
TCM
Input speed sensor 1, 2
Input speed
N idle instruction
signal (Standby sig-
nal)*
N idle instruction
signal (Start signal)*
Idle neutral con-
trol
Low brake sole-
noid valve
Output speed sensor
Output shaft revolution
A/T fluid temperature
sensor
ATF temperature
Transmission range
switch
Selector lever position
ECM
Engine speed signal*
Accelerator pedal posi-
tion signal*
Throttle position signal*
BCM
Stop lamp switch signal*
Turn indicator signal*
ABS actuator electric
unit (control unit)
Pressure sensor signal*
Decel G sensor signal*
Combination meter
Vehicle speed signal*
Driving location
: Level road and gentle slope
Selector lever position
: “D” position
Vehicle speed
: 0 km/h (0 MPH)
Accelerator pedal opening
: 0.0 / 8
Brake pedal
: Depress
Engine speed
: Idle speed
Snow mode switch
: OFF
Turn signal lamp and hazard warning lamp
: OFF
TM-54
< SYSTEM DESCRIPTION >
[7AT: RE7R01B]
SYSTEM
SHIFT PATTERN CONTROL : System Diagram
INFOID:0000000006226775
SHIFT PATTERN CONTROL : System Description
INFOID:0000000006226776
It automatically selects the shift pattern (such as road environment and driving style) suitable for the various
situations so as to allow the vehicle to be driven efficiently and smoothly.
ASC (ADAPTIVE SHIFT CONTROL)
JSDIA1854GB
SYSTEM
TM-55
< SYSTEM DESCRIPTION >
[7AT: RE7R01B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
• When driving on an up/down slope
ASC judges up/down slope according to engine torque data transmitted from the ECM and vehicle speed.
Fixing at 4GR, 5GR or 6GR on an up-slope prevents shift hunting and controls the vehicle to gain optimum
driving force. On a down-slope, automatic shift-down to 4GR, 5GR or 6GR controls to gain optimum engine
brake.
• When driving on a curve
TCM receives the side G sensor signal from the ABS actuator and electric unit (control unit). It locks to 4GR,
5GR or 6GR position in moderate cornering or to 3GR position in sharp cornering based on this signal. This
prevents any upshift and kickdown during cornering, maintaining smooth vehicle travel.
Tow Mode
• High driving torque is required for towing a heavy load. The tow mode enables torque-oriented driving by
changing the shift schedule to that of delaying A/T gear shift timing (compared to normal driving).
• TCM receives tow mode switch signal from combination meter via CAN communication. The tow mode turns
ON when TCM receives the signal. TCM transmits a tow mode indicator lamp signal to the combination
meter via CAN communication to turn ON the tow mode indicator lamp mounted in the combination meter.
MANUAL MODE
Item
Signal
TCM function
Actuator
Input speed sensor 1, 2
Input speed
ASC (Adaptive shift
control)
• High and low reverse
clutch solenoid valve
• Direct clutch solenoid
valve
• Input clutch solenoid valve
• Low brake solenoid valve
• 2346 brake solenoid valve
• Front brake solenoid valve
• Torque converter clutch so-
lenoid valve
• Line pressure solenoid
valve
• Anti-interlock solenoid
valve
Output speed sensor
Vehicle speed
A/T fluid temperature sensor
ATF temperature
ECM
Engine speed signal*
Accelerator pedal position signal*
Closed throttle position signal*
Engine and A/T integrated control signal
(engine torque)*
ABS actuator and electric unit
(control unit)
Side G sensor signal*
BCM
Stop lamp switch signal*
Combination meter
Tow mode switch signal*
JSDIA1362GB
TM-56
< SYSTEM DESCRIPTION >
[7AT: RE7R01B]
SYSTEM
Input/Output Signal Chart
*: This signal is transmitted via CAN communication line.
• The TCM receives the manual mode signal, non-manual mode signal, manual mode shift up signal and
manual mode shift down signal from combination meter via CAN communication line. The TCM shifts shift
pattern control to the manual mode based on these signals, and then shifts the A/T by operating each sole-
noid valve according to the shift operation of the driver.
• The TCM prohibits the manual mode while being in fail-safe mode due to an A/T malfunction, etc. Refer to
.
Manual Mode Information
• The TCM transmits the manual mode shift refusal signal to the combination meter if the TCM refuses the
transmission from the driving status of vehicle when the selector lever shifts to “UP (+ side)” or “DOWN (
−
side)” side. The combination meter blinks shift indicator on the combination meter and sounds the buzzer to
indicate the driver that the shifting is not performed when receiving this signal. However, the TCM does not
transmit the manual mode shift refusal signal in the conditions as per the following.
- When the selector lever shifts to “DOWN (
−
side)” side in 1GR.
- When the selector lever shifts to “UP (+ side)” side in 7GR.
LOCK-UP CONTROL
LOCK-UP CONTROL : System Diagram
INFOID:0000000006226777
LOCK-UP CONTROL : System Description
INFOID:0000000006226778
• The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
• Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
• The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid
valve, which is controlled by a signal from TCM, and the torque converter clutch control valve engages or
releases the torque converter clutch piston.
Item
Signal
TCM function
Actuator
Output speed sensor
Vehicle speed
Manual mode
• High and low reverse clutch
solenoid valve
• Direct clutch solenoid valve
• Input clutch solenoid valve
• Low brake solenoid valve
• 2346 brake solenoid valve
• Front brake solenoid valve
• Torque converter clutch sole-
noid valve
• Line pressure solenoid valve
• Anti-interlock solenoid valve
A/T fluid temperature sensor
ATF temperature
ECM
Engine speed signal*
Accelerator pedal position sig-
nal*
Combination meter
Manual mode signal*
Non-manual mode signal*
Manual mode shift up signal*
Manual mode shift down signal*
JSDIA1350GB
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