Exhaust valve timing control : system diagram
Exhaust valve timing control : system description
INPUT/OUTPUT SIGNAL CHART
Sensor | Input signal to ECM | ECM function | Actuator |
Crankshaft position sensor (POS) | Engine speed*1 Piston position | Exhaust valve timing control | Exhaust valve timing control solenoid valve |
Camshaft position sensor (PHASE) | |||
Engine oil temperature sensor | Engine oil temperature | ||
Engine coolant temperature sensor | Engine coolant temperature | ||
Combination meter | Vehicle speed*2 |
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the exhaust valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, engine oil temperature and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the exhaust valve timing (EVT) control solenoid valve depending on driving status. This makes it possible to control the shut/ open timing of the exhaust valve to increase engine torque and output in a range of high engine speed.
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Additional service when replacing
ECM
Description
When replacing ECM, the following procedure must be performed.
PROGRAMMING OPERATION
NOTE:
After replacing with a blank ECM, programming is required to write ECM
information. Be sure to follow the procedure
to perform the programming.
Work Procedure
1.CHECK ECM PART NUMBER
Che ...
The braking distance is long
Diagnosis Procedure
CAUTION:
The stopping distance on slippery road surfaces might be longer with the ABS
operating than when
the ABS is not operating.
1.CHECK ABS FUNCTION
Turn ignition switch OFF.
Disconnect ABS actuator and electric unit (control unit) connector to
deactivate ABS ...