Purpose, Function
HLA
The HLA maintains the valve clearance at a constant 0 mm and maintenance-free valve clearance is realized.
Rocker arm
With the adoption of the needle roller bearing built into the rocker arm, the contact to the cam employs rolling contact to reduce sliding resistance.
Construction
HLA
The HLA is installed to the cylinder head.
Rocker arm
The rocker arm is installed to the HLA and upper area of the valve.
The needle roller bearing is built into the rocker arm.
Operation
Before valve opening
1. The plunger presses up the rocker arm by the spring force of the plunger spring to maintain the valve clearance at 0 mm.
During valve opening
1. If the cam presses down the rocker arm, load is applied to the plunger and valve.
2. If load is applied to the plunger, the hydraulic pressure in the high pressure chamber (A chamber) increases and the check ball closes the hydraulic passage.
3. If the hydraulic passage is closed, the plunger is fixed becoming the rocker arm pivot point because the volume of the engine oil in the high pressure chamber is not changed.
4. The rocker arm presses down the valve.
After valve opening
1. If load is not applied to the plunger, the plunger spring presses up the plunger (maintains valve clearance at 0 mm).
2. Because the capacity of the high pressure chamber (A chamber) increases in Step 1, the check ball is opened and engine oil flows from the reserve chamber (B chamber) to the high pressure chamber (A chamber) to prepare for the next step.
3. The oil in the reserve chamber (B chamber) which is decreased by supplying it to the high pressure chamber (A chamber), is supplied from the oil passage of the cylinder head.
Air Fuel Ratio (A/F) Sensor Inspection
A/F Sensor Inspection
1. Connect the M-MDS to the DLC?2.
2. Switch the ignition ON (engine on).
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs using the M-MDS..
VSS (Vehicle speed)
RPM (Engine speed)
O2S11 (A/F sensor output current ...
Liftgate Recess Removal/Installation
1. Insert a tape-wrapped flathead screwdriver in the position indicated by the
arrow in the figure and detach hooks A.
2. Remove the liftgate recess in the direction of the arrow shown in the figure
avoiding hooks B.
3. Install in the reverse order of removal. ...
A/C Compressor Control [Full Auto Air Conditioner]
Purpose
The A/C compressor control switches the A/C compressor on/off according to
the vehicle environment.
Function
The A/C compressor control turns the A/C compressor on/off based on the climate
control unit operation and signals from each sensor.
The A/C compress ...