Air Conditioner Pressure Sensor
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Wiring Tab
Options
Input Type
Analogue Voltage
Selected when the supplied calibration data for the sensor is in voltage. This will require an Analogue Voltage Input (AVI) to be used and configured.
Digital Duty Cycle
Select when the input is a variable duty signal. This will require an SPI (Synchronised Pulsed Input) or DPI (Digital Pulsed Input) to be used and configured.
Connections
Air Con Pressure Input
Select an appropriate input to use for the A/C Pressure sensor. An AVI (Analogue Voltage Input), SPI (Synchronised Pulsed Input) or DPI (Digital Pulsed Input) should be used.
Connection Type - Analogue Voltage
AVI
An AVI (Analogue Voltage Input) is suggested.
Pull Up
Typically the pull up should be enabled with any two-wire sensor, and disabled for sensors with their own voltage supply. If the sensor is being shared with another ECU, such as with a piggyback installation with an OEM ECU, then the other ECU will generally include a necessary pull up and this setting should be set to Disabled.
SPI
An SPI (Synchronised Pulsed Input) can be used as an analogue input if there are no available AVIs.
Sensor Type
Set to Hall Effect for all Analogue inputs
Pull Up
Enables a weak 10k pull up if a voltage reference is not provided at the sensor end. For two-wire sensors that require a pull up, enabling the Internal pull up may cause pre-installed calibrations to require adjustment. Alternatively, disabling the Internal pull up and using an external 1k resistor between the signal and the +5V sensor supply will ensure the pre-installed calibrations are correct, and provide functionality equivalent to a dedicated AVI.
Connection Type - Digital Duty Cycle
SPI/DPI
An SPI or DPI requires configuring of the edge and the type of Sensor to be connected.
Edge Select
Select the edge of the signal to be used. Typically this will be Falling unless instructed otherwise.
Sensor Type
Select if the sensor being used is a digital Hall Effect or a reluctor sensor.
Pull Up
Some Hall Effect sensors require a Pull Up if it is not incorporated in the wiring or the sensor itself. Enable as required.
Calibration Tab
This allows calibrations for a A/C Pressure Sensor to be loaded or saved. A number of calibrations come pre-installed with the ESP Software package. If your sensor is not listed, a custom calibration can be created with the data provided by the sensor manufacturer.
From the image above:
1 – Selecting the yellow Open icon on the top left will allow the loading of a pre-configured calibration file.
2 – Selecting the blue Disk icon next to the open icon will allow the saving of your custom calibration file.
Display Tab
Warning Minimum
When the A/C pressure sensor reads below this amount, any A/C pressure items on the ESP software will flash Red as a warning of low pressure.
Warning Maximum
When the A/C pressure sensor reads above this amount, any A/C pressure items on the ESP software will flash Red as a warning of high pressure.
Diagnostics Tab
The settings in this tab allow limits to be set for the detection of either fault conditions, or conditions that could be considered to cause engine damage related to the A/C pressure.
Raw Min
When enabled, this allows for the error code P0532 to be set when the voltage is below the set amount. This is used to detect a short or disconnection with the wiring. If the Engine Protection function is active a DTC Severity level can be selected for this condition if desired. (Default = Disabled)
Raw Max
When enabled, this allows for the error code P0533 to be set when the voltage is above the set amount. This is used to detect a short or disconnection with the wiring. If the Engine Protection function is active a DTC Severity level can be selected for this condition if desired. (Default = Disabled)
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