Daytona L4-153 2.5L SOHC VIN B (1993)
Disables EVAP purge system, by grounding EVAP solenoid.
Warm Idle
PCM MONITORS:
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Engine Temperature (ECT Sensor)
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Manifold Vacuum (MAP Sensor)
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Engine rpm (distributor pick-up)
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Throttle Position (TPS)
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Exhaust Gas Oxygen Content (O2S)
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A/C Switch Status
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Battery Voltage
PCM CONTROLS:
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Air/fuel ratio, by varying injector pulse width. Switches injector ground on and off twice per engine revolution.
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Idle speed, through the IAC motor.
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Ignition timing.
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Monitor oxygen sensor and fine tune air/fuel ratio by varying injector pulse width
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Operate A/C Compressor Clutch relay (if selected)
Limp-In Operation
NOTE: The vehicle has entered Limp-In if the Malfunction Indicator Lamp (MIL), is illuminated during vehicle operation.
PURPOSE
In Limp-In mode the PCM allows for limited vehicle operation, when one or more inputs is out side of limits.
The vehicle should be driven to a service facility as soon as possible.
OPERATION
The PCM substitutes the input of an alternate sensor for that of the failed sensor, while continueing to monitor the faulty sensor input(s).
If the faulty sensor input returns to and remains within limits for a long enough period, the PCM resumes normal operation.
Ignition Switch on (Zero RPM)
PCM READS:
Atmospheric Pressure (MAP sensor)
Engine Temperature (ECT Sensor)
Throttle Position (TPS)
PCM OPERATION:
The PCM calculates basic start-up fuel strategy, using current; atmospheric pressure, engine temperature, and throttle position.
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PCM prepositions the idle air control motor.
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PCM energizes ASD and fuel pump relays for up to 3 seconds.
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PCM energizes oxygen sensor heating element.
NOTE: When the key is on and the engine is not running, the Automatic Shutdown (ASD) and fuel pump relays are deactivated after 1 to 3 seconds.
Engine Start-Up (Cranking)
THE PCM LOOKS FOR AN IGNITION REFENCE SIGNAL: