Engine and Emission Control System Description — Fuel Pressure Regulator Control (Cont'd) / Acceleration Cut Control
EF & EC-20prose procedureFuel Pressure Regulator Control (Cont'd)
SYSTEM DESCRIPTION
The fuel "pressure-up" control system briefly increases fuel pressure for improved starting performance of a hot engine. Under normal operating conditions, manifold vacuum is applied to the fuel pressure regulator. When starting the engine, however, the E.C.U. allows current to flow through the ON/OFF solenoid valve in the control vacuum line, opening this line to the atmosphere. As a result, atmospheric pressure is applied, throttling the fuel passage to increase fuel pressure.
Fuel Pressure Regulator Control Timing Diagram
Rendering diagram…
Acceleration Cut Control
INPUT/OUTPUT SIGNAL LINE
Acceleration Cut Control Input/Output Signal Line
Computing layout…
Wire Details
| From | To | Color |
|---|---|---|
| throttle_sensor | eccs | |
| crank_sensor | eccs | |
| eccs | ac_relay |
SYSTEM DESCRIPTION
When E.C.U. detects heavy load conditions, air conditioner is turned off for a few seconds. This system improves acceleration when air conditioner is used.