Sundance Duster L4-153 2.5L SOHC VIN K TBI (1993)
If a signal is received within 0.5 seconds, the PCM energizes (grounds), the ASD and fuel pump relays. Supplying battery voltage to the fuel
pump, fuel injector, ignition coil and oxygen sensor heating element. After the PCM energizes the ASD and fuel pump relays, the PCM fires the
fuel injector 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 and fuel pump relays.
PCM MONITORS:
-
Engine Temperature (ECT Sensor)
-
Manifold Vacuum (MAP Sensor)
-
Throttle Position (TPS)
-
Engine speed (distributor pick-up)
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)
-
Engine rpm (distributor pick-up)
-
Throttle Position (TPS)
-
A/C Switch Status
-
Battery Voltage
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)
-
Engine rpm (distributor pick-up)
-
Throttle Opening (TPS)
-
Battery Voltage
PCM CONTROLS:
-
De-energizes EGR system, by grounding Electronic EGR Transducer (EET) solenoid.
-
Adjusts injector pulse width, to supply additional fuel.
-
Monitor oxygen sensor and fine tune air/fuel ratio by varying injector pulse width
-
Adjust ignition timing.
