Daytona IROC R/T L4-135 2213cc 2.2L DOHC Turbo VIN A FI (1993)
- 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:
If a signal is received within 0.5 seconds, the PCM energizes (grounds), the ASD relay. Supplying battery voltage to the fuel pump, fuel injector,
ignition coil and oxygen sensor heating element. After the PCM energizes the ASD relay, the PCM fires the fuel injectors 4 times per revolution,
(instead of the normal 2 pulses per revolution).
If NO signal received within 0.5 seconds, the PCM does not energize the ASD relay.
PCM MONITORS:
- Engine Temperature (ECT Sensor)
- Manifold Vacuum (MAP Sensor)
- Throttle Position (TPS)
- Charge Temperature Sensor
- Camshaft and Crankshaft Position (CMP and CKP Sensors)
- Engine Knock Sensor
PCM CONTROLS:
- Injector pulse width, (switching the ground on and off twice per engine revolution).
- Idle speed, through the IAC motor.
- Ignition timing.
PCM TESTS MAP SENSOR OPERATION:
When engine idle comes within ±64 rpm of target idle speed, the PCM, compares the current MAP sensor reading to the atmospheric pressure
measurement, taken during Ignition ON (Zero RPM) mode, and if a minimum difference is not detected, a MAP sensor Diagnostic Trouble Code
(DTC) is set in memory
Engine Warm Up
PCM MONITORS:
- Engine Temperature (ECT Sensor)
- Manifold Vacuum (MAP Sensor)
- Charge Temperature Sensor
- Cam and Crankshaft Position (CMP and CKP Sensors)
- Throttle Position (TPS)
- A/C Switch Status
- Battery Voltage
- Engine Knock Sensor
PCM CONTROLS:
- Injector pulse width, (switching the ground on and off twice per engine revolution).
- Idle speed, through the IAC motor.
- Ignition timing.
NOTE: PCM will monitor the ECT sensor, and when the time delay has elapsed and the engine has reached operating temperature, the system will leave
warm up mode and go into closed loop operation.
Wide Open Throttle (WOT)
PCM MONITORS:
- Engine Temperature (ECT)
- Manifold Vacuum (MAP sensor)
- Charge Temperature Sensor
