Honda HR-V: CVT System Description - Power Flow (CVT)
P Position
Hydraulic pressure is not applied to the forward clutch and the reverse
brake. Power is not transmitted to the secondary drive gear. The driven pulley
is locked by the park pawl interlocking the park
gear.
N Position
Engine power transmitted from the torque converter drives the input shaft,
but the hydraulic pressure is not applied to the forward clutch and the reverse
brake. Power is not transmitted to the drive
pulley shaft.
Low Speed Range
- Hydraulic pressure is applied to the forward clutch, then the forward
clutch engages the forward clutch hub/sun gear with the drive pulley shaft.
- The drive pulley shaft drives the driven pulley shaft linked by the
steel belt.
- The driven pulley shaft drives the secondary driven gear via the
secondary drive gear.
- Power is transmitted to the final drive gear, which in turn drives the
final driven gear.
- At low speed range; pulley ratio high, the drive pulley receives lower
pressure than driven pulley received pressure, the drive pulley applies the
small-pulley-diameter to the steel belt.
High Speed Range
- Power flow to the final driven gear is the same as at the low speed
range.
- As the vehicle speed is increased, the drive pulley pressure is
increased by the CVT drive pulley pressure control solenoid valve, and the
driven pulley pressure is decreased by the CVT driven
pulley pressure control solenoid valve.
- At high speed range; pulley ratio low, the drive pulley receives higher
pressure than driven pulley received pressure, the drive pulley applies the
large-pulley-diameter to the steel belt.
R Position
- Hydraulic pressure is applied to the reverse brake, and the planetary
carrier locks with the reverse brake.
- The ring gear joined with the forward clutch drum and the input shaft
drives the sun gear via the planetary pinion gears.
- The sun gear rotates in the reverse direction from the input shaft
rotational direction, and drives the drive pulley shaft.
- The drive pulley shaft drives the driven pulley shaft linked by the
steel belt.
- The driven pulley shaft drives the secondary driven gear via the
secondary drive gear.
- Power is transmitted to the final drive gear, which in turn drives the
final driven gear.
CVT SYSTEM DESCRIPTION - SHIFT LOCK SYSTEM (CVT)
Shift Lever Assembly
The shift lever equips the shift lock function. Also, the parking pin switch
is used for one of the key interlock system and installed on the shift lever,
and sends the parking position signal (shift lever
is in P position/mode) to the Multiplex Integrated Control Unit (MICU). The MICU
controls that the ignition key can be pulled out from the key cylinder only when
the shift lever is in P
position/mode.
Shift Lock System
The shift lock system prevents the shift lever from moving unless certain
conditions are met. The shift lock solenoid is normally OFF. After starting the
engine in P position/mode, the shift lock stop
prevents the shift lever from moving to any other positions / modes from P
position/mode. When the brake pedal is pressed and the accelerator pedal is not
pressed, the PCM commands the shift lock
solenoid ON; the shift lock solenoid plunger in the shift lock solenoid pulls
the shift lock stop to release the lock pin. Pressing the shift lever button
allows the shift lever to move to any other
positions / modes. When the brake pedal and the accelerator pedal are pressed at
the same time, the PCM commands the shift lock solenoid OFF and the shift lock
system is locked.
Shift Lock Release
When the shift lock system does not operate due to mechanical or electrical
problem, you can unlock the shift lock temporarily by inserting the ignition key
into the shift lock release hole and
pressing the shift lock release. When the shift lock release is pressed, the
shift lock stop releases the lock pin, and the shift lever can move to any other
positions / modes.
READ NEXT:
CVT SYSTEM DTC TROUBLESHOOTING INDEX (KA/KC CVT)
NOTE: Before you troubleshoot, record all freeze data and any on-board
snapshot with the HDS, and review the General Troubleshooting Information -
Re
Test
1. Vehicle - Lift
2. Engine Undercover - Remove (With 2WD)
3. CVT Clutch Pressure Control Solenoid Valve - Test
Disconnect the connector (A).NOTE:
To prevent damage, cover the connector usin
SEE MORE:
DTC (Backup Control Unit)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the
instructions in B-CAN System
Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System
Diagnosis Test Mode
A - Initial Communication and DTC Checks.
1. Problem verification.
Cl
Removal & Installation
Do not spill brake fluid on the vehicle; it may damage the paint. If brake
fluid does contact the paint, wash it off
immediately with water.
NOTE:
Press the brake pedal several times to deplete the vacuum in the brake
booster.
Be careful when handling the master cyl