Ambient Air Temperature Sensor
An Ambient Air Temperature Sensor measures the temperature of the air outside of the vehicle. Temperature sensors are typically two wire sensors; a signal wire that is connected to an AVI, and a signal ground wire.
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Wiring Tab
Options
Input Type
Analogue Voltage
Select when the input is a varying 0 to 5V signal.
Analogue Resistance
Select when the input is a varying resistance
Thermocouple Type K
Select when a Haltech TCA unit is connected and a Thermocouple is to be used.
Connections
Ambient Air Temperature Input
Select an appropriate input to use for the ambient air temperature sensor. An AVI (Analogue Voltage Input) or SPI (Synchronised Pulsed Input) should be used.
Connection Type
AVI
An AVI (Analogue Voltage Input) is suggested.
Pull up
Enables a 1k pull up resistor to 5V.
Typically the pull up should be enabled with any two-wire temperature 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 where there are no available AVIs.
Sensor Type
Set to Hall Effect for all analogue inputs
Pull up
Enables a weak 10k pull up resistor to 5V.
Typically the pull up should be enabled with any two-wire temperature 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.
Please note pre installed temperature sensor calibrations will require adjustment if used with an SPI.
Calibration Tab
This allows calibrations for an Ambient Air Temperature 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.
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 Ambient Air Temperature Sensor.
Raw Min
When enabled, this allows for the error code P0070 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 P0071 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)
Operating Min
When enabled allows detection of ambient air temperature conditions that could indicate a sudden drop in air temp. This will activate the DTC P0072. If the Engine Protection function is active a DTC Severity level can be selected for this condition if desired. (Default = Disabled)
Operating Max
When enabled allows detection of ambient air temperature conditions that could indicate a sudden spike in air temperature. This will activate the DTC P0073. If the Engine Protection function is active a DTC Severity level can be selected for this condition if desired. (Default = Disabled)