JKS 3575
JKS J-CAL Installation
Page 3
Diagnostics
A Diagnostic Trouble Code (DTC) arises when a vehicle’s
computer detects a sensor failure or a parameter outside
a specific range. In the case of a detected failure, most
vehicles will illuminate the check engine light alerting you
of a failure:
The JKS J-CAL allows you view these codes, and gives
you the option to clear them. The two Diagnostic menu
options are as follows:
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Read DTCs - will display the code along with a full
text description.
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Clear DTCs - will allow you to clear the code,
which will then turn off your check engine light.
If a DTC Persists, this could indicate a vehicle
malfunction. We recommend seeking a qualified
professional in resolving the issue. Return the vehicle
back to stock prior to service.
Identify Vehicle
The following information is provided by this feature:
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Vehicle Engine Control Unit (ECU) - is a device
used to ensure optimum running.
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Diagnostic Comm - is how your vehicle
communicates with individual systems & sensors.
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Vehicle Identification Number (VIN) - is a unique
serial number use to identify your vehicle.
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Engine Control Module (ECM PN) part number -
identifies the specific ECM installed.
Vehicle Functions
Based on the year and model of your Jeep, you may have
the option to modify various features using the JKS J-CAL
device. This section provides a brief explanation on what
these functions are, and how they are used.
TIRE SIZE
Improve the accuracy of the vehicle’s speedometer by
compensating for non-stock tire sizes.
To adjust the Tire Size:
Click the Tire Size option from the Vehicle
Functions Menu.
Using the left/right arrows, adjust the slide until
the correct tire diameter is displayed.
Press OK.
AXLE RATIO
Improve your Jeep’s 2WD shift points by modifying the
axle gear ratio.
To adjust the Axle Ratio:
Click the Axle Ratio option from the Vehicle
Functions Menu.
Using the left/right arrows to adjust the slide.
Press OK.
TRANSFER CASE HIGH (T.CASE HI)
Improve your Jeep’s 4 Hi shift points by modifying the
transfer case gear ratio.
To adjust the Transfer Case High Gear Ratios:
Choose an option from the Vehicle Functions
Menu.
Use the left/right buttons to adjust the value.
Press OK.
