D 250 Pickup L6-359 5.9L DSL (1992)
During acceleration, the following actions occur:
-
The Throttle Position Sensor (TPS), Engine Speed Sensor and the Vehicle Distance (speed) Sensor are used to determine when the automatic
transmission can be shifted into overdrive.
-
If the coolant temperature is below 60°F (16°C), the coolant temperature switch will close, and the controller will prevent the automatic
transmission from being shifted into overdrive. Once the coolant temperature reaches 60°F (16°C), then the coolant temperature switch will
open.
-
If the air intake temperature is at or below 90°F (32°C), then the air temperature switch is closed, allowing voltage to flow to the KSB
solenoid. When the intake air temperature increases above 90°F (32°C), the air temperature switch will open, DE-ENERGIZING the KSB
solenoid.
-
If the transmission thermo-switch is open, the transmission will not be allowed to be shifted into overdrive (automatic transmission). If the
transmission thermo-switch opens while the transmission is in overdrive, then the transmission will be downshifted. The opening or closing
of the transmission thermo-switch is dependant upon the temperature of the transmission fluid. The thermo-switch opens at 273°F (134°C),
and closes when the transmission fluid drops to 240°F (116°C).
-
If the speed control system is being used, and the resume/accelerate button is held, the ECU will only allow the vehicle to accelerate at a
predetermined rate. If the speed control system has been set, and the resume/accelerate button is momentarily pressed, the ECU will
accelerate the vehicle at two mile per hour increments. If the brakes are applied, the ECU will de-activate the speed control system.
-
The ECU will turn on the Water-In-Fuel lamp if it receives a signal from the Water-In-Fuel sensor.
Deceleration
During deceleration, the following actions occur:
-
The Throttle Position Sensor (TPS), Engine Speed Sensor and the Vehicle Distance (speed) Sensor inputs are used to control automatic
transmission overdrive operation.
-
If the coolant temperature is below 60°F (16°C), the automatic transmission will not be allowed to enter overdrive operation. Once the
coolant temperature reaches 60°F (16°C), the coolant temperature switch will open.
-
If the transmission thermo-switch is open, the transmission will not be allowed to be shifted into overdrive (automatic transmission). If the
transmission thermo-switch opens while the transmission is in overdrive, then the transmission will be downshifted. The opening or closing
of the transmission thermo-switch is dependant upon the temperature of the transmission fluid. The thermo-switch opens at 273°F (134°C),
and closes when the transmission fluid drops to 240°F (116°C).
-
If the air intake temperature is at or below 90°F (32°C), then the air temperature switch is closed, allowing voltage to flow to the KSB
solenoid. When the intake air temperature increases above 90°F (32°C), the air temperature switch will open, DE-ENERGIZING the KSB
solenoid.
-
If the speed control system is being used, and the coast/set button is held, the ECU will only allow the vehicle to decelerate at a
predetermined rate. If the coast/set button is released, while decelerating, the ECU will reset the speed control to the rate of speed the vehicle
was traveling when the coast/set button was released.
-
If the brakes are applied, the ECU will de-activate the speed control system.
-
The ECU will turn on the Water-In-Fuel lamp if it receives a signal from the Water-In-Fuel sensor.
Ignition Switch Off
When the key is placed in the OFF position, the ECU still receives battery voltage. The ECU needs battery voltage at all times to keep its memory
alive. The memory stores TPS value from the previous Key-on and it stores fault codes.
