Honda Ridgeline. Manual — part 164
04
05
D position D3 Driving Mode Control
14-41
SHIFT LEVER KNOB
D3 SWITCH
GAUGE ASSEMBLY
D3 INDICATOR
D INDICATOR
A/T GEAR POSITION
INDICATOR
This automatic transmission is equipped with the D3 driving mode in D. The D position has two modes; general
driving mode (shifts gears automatically 1st through 5th), and the D3 driving mode (shifts gears automatically 1st
through 3rd). The transmission switches the mode when the D3 switch on the end of the shift lever knob is pressed
with the transmission in D.
When the transmission is switched into the D3 driving mode, the D3 indicator next to the D indicator in the gauge
assembly comes on. In the D3 driving mode, the D3 driving mode is cancelled by pressing the D3 switch, and the D3
indicator goes off. Also, the D3 driving mode is cancelled when the ignition switch is turned to LOCK (0). When the
shift lever is moved out of D in the D3 driving mode, the D3 indicator goes off, but the transmission returns to the D3
driving mode when the shift lever is returned to D, and the D3 indicator comes on again.
(cont’d)
*05
Electronic Control System (cont’d)
Shift Control - Grade Logic Control
14-42
Automatic Transmission
System Description (cont’d)
PCM
Engine RPM Signal
Throttle Position
Sensor Signal (DBW)
Engine Coolant
Temperature
Sensor Signal
Barometric Pressure
Sensor Signal
Transmission Range
Switch Signal and
D3 Switch Signal
Output Shaft
(Countershaft)
Speed Sensor Signal
Brake Pedal Position
Switch Signal
Shift Solenoid Valve A
Shift Solenoid Valve B
ATF Temperature
Sensor Signal
Shift Solenoid Valve C
Actual
Driving
Shift
Position
Read of ATF
Temperature
Engine RPM Control
Shift Position
Control
Fail-safe Control
Comparison
with
Signals
Master Target of
Shifting Position
Grade Logic Control
Calculation of
Gradient
Correction of Engine
Coolant Temperature
Sensor Signal Data
Correction of Cruise
Control Signal Data
by Downshift
Request Signal
Accelerator Pedal
Position Sensor
Signal
Input Shaft
(Mainshaft)
Speed Sensor Signal
Correction of Data
Selection of
Shifting Mode
VSA Modulator-control
Unit Signal
The grade logic control system is used to control shifting in D. The PCM compares actual driving conditions with
programmed driving conditions, based on the input from the throttle position sensor, the engine coolant temperature
sensor, the barometric pressure sensor, the brake pedal position switch signal, and the shift lever position signal, to
control shifting while the vehicle is ascending or descending a slope.
*01
*02
Grade Logic Control: Ascending Control
Grade Logic Control: Descending Control
Deceleration Control
14-43
100 %
50
0
ASCENDING MODE: Upshift Schedule
Vehicle speed
: MEDIUM ASCENDING MODE
: FLAT ROAD MODE
: STEEP ASCENDING MODE
: GRADUAL ASCENDING MODE
: HEAVY STEEP ASCENDING MODE
50
DESCENDING MODE: Downshift Schedule
Vehicle speed
0
: FLAT ROAD MODE
: GRADUAL DESCENDING MODE
: STEEP DESCENDING MODE
: MEDIUM DESCENDING MODE
100 %
Thr
ot
tl
e
ope
ni
ng
2ND
3RD 3RD
4TH
2ND
4TH
5TH
1ST
2ND
3RD 3RD
4TH
2ND
4TH
5TH
1ST
T
h
rot
tl
e
o
pe
n
ing
When the PCM determines that the vehicle is climbing a hill in the D position, the system extends the engagement
area of 2nd gear, 3rd gear, and 4th gear to prevent the transmission from frequently shifting between 2nd and 3rd
gears, between 3rd and 4th gears, and between 4th and 5th gears, so the vehicle can run smooth and have more
power when needed.
NOTE: Shift commands stored in the PCM between 2nd and 3rd gears, between 3rd and 4th gears, and between 4th
and 5th gears, enable the PCM to automatically select the most suitable gear according to the magnitude of a gradient.
When the PCM determines that the vehicle is going down a hill in the D position, the shift-up speed from 4th to 5th
gear, 3rd to 4th gear, and from 2nd to 3rd (when the throttle is closed) becomes faster than the set speed for flat road
driving to extend the 4th gear, 3rd gear, and 2nd gear driving areas. This, in combination with engine braking from the
deceleration lock-up, achieves smooth driving when the vehicle is descending. There are three descending modes
with different 4th gear driving areas, 3rd gear driving areas and 2nd gear driving areas according to the magnitude of
a gradient stored in the PCM. When the vehicle is in 5th or 4th gear and you are decelerating while applying the brakes
on a steep hill, the transmission will downshift to a lower gear. When you accelerate, the transmission will then return
to a higher gear.
When the vehicle goes around a corner and needs to decelerate first and then accelerate, the PCM sets the data for
deceleration control to reduce the number of times the transmission shifts. When the vehicle is decelerating from
speeds above 27 mph (43 km/h), the PCM shifts the transmission from 5th or 4th to 2nd earlier than normal to cope
with upcoming acceleration.
(cont’d)
*06
Electronic Control System (cont’d)
Clutch Pressure Control
14-44
Automatic Transmission
System Description (cont’d)
PCM
Engine RPM Signal
Throttle Position
Sensor Signal (DBW)
ATF Temperature
Sensor Signal
Actual
Driving
Shift
Position
Correction of Data
Master Target of
Controlling Current
Decision of
Shifting Mode
Current
Feedback
A/T Clutch Pressure
Control Solenoid
Valves A, B, and C
Engine Coolant
Temperature
Sensor Signal
Input Shaft
(Mainshaft)
Speed Sensor Signal
Output Shaft
(Countershaft)
Speed Sensor Signal
Manifold Absolute
Pressure Sensor Signal
3rd Clutch
Transmission Fluid
Pressure Switch Signal
4th Clutch
Transmission Fluid
Pressure Switch Signal
Accelerator Pedal
Position Sensor
Signal
Barometric Pressure
Sensor Signal
Correction of Engine
Coolant Temperature
Sensor Signal Data
Correction of ATF
Temperature Sensor
Data
Correction of
Hydraulic Pressure
Application Timing
Correction of Engine
Torque Signal Data
The PCM actuates A/T clutch pressure control solenoid valves A, B, and C to control the clutch pressure. When shifting
between lower and higher gears, the clutch pressure regulated by A/T clutch pressure control solenoid valves A, B,
and C engages and disengages the clutch smoothly.
The PCM receives input signals from the various sensors and switches, processes the data, and outputs current to A/T
clutch pressure control solenoid valves A, B, and C.
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