Land Rover Iidtool For Discovery 3 Britpart Manual

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IIDTool
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009D3-
  Anti-lock Braking System (ABS)   
Yaw Rate Sensor Calibration
This routine is used when a new ABS ECU or a new yaw sensor is fi tted. The yaw sensor measures a 
vehicle’s angular velocity around its vertical axis.
  Transfer Case ECU
Clutch Calibration
This routine will calibrate the transfer case clutch.
 Preparations
•      Turn engine OFF
•      Select neutral and engage the parking brake
•      Start the routine and follow the instructions on screen
 Use
This function is used when:
•      The switch is replaced
•      The transfer box ECU is replaced
•      The range position sensor is replaced
•      The transfer box motor is replaced
•      The transfer box is replaced
Position or Range Sensor Calibration
This routine will allow the TCCM ECU to learn the sensors characteristics.
 Preparations
•      Turn engine OFF
•      Select neutral and engage the parking brake
•      Start the routine and follow the instructions on screen
 Use
This function is used when:
•      The transfer box ECU is replaced
•      The range position sensor is replaced
•      The transfer box is replaced
Notes: Both calibrations should be performed outside since starting the engine is required at one point. 
It is normal for warning lights to turn ON and error messages to be displayed during these calibrations. 
						

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IIDTool
D3-
 Suspension ECU
Defi nition
For baseline calibration, the standard function allows changes to each corner individually, Front Left, 
Front Right, Rear Left and Rear Right.
These menu items allow calibration of the absolute value (in mm) of each height sensor.  
This is 
only required when height sensors, linkages or any parts related to the height measuring are 
replaced or reinstalled. It may also be needed after a wheel alignment. For height changes, rai-
sing or lowering the vehicle, please refer to the Height function. 
 At a minimum, calibration can 
be done on either axle, front or rear, but it is recommended that all four corners be calibrated simulta-
neously. 
 
WARNING
Calibration of individual sensors should only be attempted by 
experienced users. Read this section very carefully and only 
undertake a calibration when the procedure is fully understood.
Serious damages can occur if the procedure is performed im-
properly! GAP Diagnostics assumes no liability for damages or 
injuries incurred during use or resulting from the use of the IID-
Tool. 
Notes: 
•  Different calibration values for each corner are normal – they do NOT need to be set to the 
same value! These values represent arbitrary electrical values provided by the height sensors. 
Correlating these values to the measured height of each corner is part of the calibration proce-
dure.
•  Changes in calibration are instantaneous in the EAS ECU but the ECU may not apply these 
changes immediately. The EAS ECU will adjust a corner when it’s +/- 10 mm or higher than the 
desired height. For example if the corner is at +9 mm, it will not adjust the height.
•  The settings and changes are given in millimeters but this does not correspond exactly to 
changes at the wheel. Each change in height must be measured from the bottom of the wheel 
arch to the center of the wheel (see step 5).
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009 
						

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IIDTool
Steps:
1. Preparation: go to 
http://gap-diagnostic.com/support/documents.html, download and print the  
EAS Calibration Aid and Sample EAS Calibration Calculation. Make sure the air pressure in 
each tire (or tyre...) are within specifi cation and that no heavy objects are in the vehicle.  Place 
the vehicle on a fl at, level surface in standard mode with wheels straight. While small surface 
irregularities may not reduce the accuracy of a calibration, large irregularities can make the 
calibration harder to verify. The calibration must be done outside with the engine running as the 
air suspension will not rise when the engine is not running. Study these instructions and the 
Sample EAS Calibration Calculation before proceeding.
2.  The vehicle must fi rst be brought to a steady state in standard height mode. To do this, change 
the height to off-road using the switch on the console. Once at off-road height (off-road LED not 
fl ashing), return to standard height and again wait for the LED to stop fl ashing. Move the vehicle 
forward 5 meters and back to its original position. 
3.  Use the IIDTool to take note of the actual calibration. Go to menu item ‘Live Values-
>Suspension 
ECU-
>Calibration’. Note down the values in the EAS Calibration Aid.
4.  Navigate the IIDTool to ‘Live Values-
>Suspension-
>Current Height’. The driver’s weight affects 
the current height values therefore they must be noted from outside the vehicle. Open the dri-
ver’s window, exit the vehicle and close the door. After a few seconds, open the door slightly. 
This will prevent the EAS ECU from making adjustments while measuring. Leave the IIDTool in 
‘Live Values-
>Suspension-
>Current Height’ mode for the following steps.
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009D3- 
						

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IIDTool
5. Measure the height in millimeters of each 
corner from the bottom of the wheel arch 
to the center of the wheel. For each corner 
take note of the current height displayed 
on the cluster LCD (from outside) just be-
fore or after taking the measurement. 
Make sure the measurement of each cor-
ner is noted at the corresponding spot.
  •  
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009D3- 
						

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IIDTool
 Option 1 : Calibrating the left sensor and using the right sensor as reference.
6.  The correct calibration is achieved by adjusting only the left side of the vehicle to match the 
right. Calculate the new calibration value for the left side using the formula below. To do the 
calculation, fi ll in the table below or on the EAS Calibration Aid with the values noted for front 
corners and repeat for rear corners.
All values are in millimeters
Front
Current Calibration Values Current Height Values Measured Heights
Front LeftX= A= C=
Front RightB= D=
                                 
Rear
Rear LeftX= A= C=
Rear RightB= D=
Calibration Formula
for left hand adjustment
All values are in millimeters
 
New Calibration 
Value  Left  Front     =Old Calibration
Value Left X+Current 
Height A-Current 
Height B-Measured 
height C+Measured 
height D
=+--+
New Calibration 
Value Left Rear=Old Calibration
Value Left X+Current 
Height A-Current 
Height B-Measured 
height C+Measured 
height D
=+--+
*Please remember: when a value minus a negative value, the minus in the equation becomes a plus 
(subtracting a negative number = adding a positive number). For example, 3 - -3 = 6
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009D3- 
						

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IIDTool
 Option 2 : Calibrating the right sensor and using the left sensor as reference.
6.   The correct calibration is achieved by adjusting only the right side of the vehicle to match the 
left. Calculate the new calibration value for the right side using the formula below. To do the 
calculation, fi ll in the table below or on the EAS Calibration Aid with the values noted for front 
corners and repeat for rear corners.
All values are in millimeters
Front
Current Calibration Values Current Height Values Measured Heights
Front RightX= A= C=
Front LeftB= D=
                                 
Rear
Rear RightX= A= C=
Rear LeftB= D=
Calibration Formula
for right hand adjustment
All values are in millimeters
New Calibration 
Value Right Front     =Old Calibration
Value Right X+Current 
Height A-Current 
Height B-Measured 
height C+Measured 
height D
=+--+
New Calibration 
Value Right Rear=Old Calibration
Value Right X+Current 
Height A-Current 
Height B-Measured 
height C+Measured 
height D
=+--+
*Please remember: when a value minus a negative value, the minus in the equation becomes a plus 
(subtracting a negative number = adding a positive number). For example, 3 - -3 = 6
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009D3- 
						

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IIDTool
 
Step 7 is an example for a left side (option 1) adjustment. If a right side adjustment is  
performed, simply replace the left for right in the following text and picture.
7.  If the ‘new calibration value left’ varies less than 3mm from the old calibration value it can be 
considered good. Otherwise navigate the IIDTool to ‘Calibration-
>Adjust Front Left’ or ‘Calibra-
tion-
>Adjust Rear Left’ and use the Speed + / Menu up and Speed - / Menu down buttons to 
adjust the value to the ‘new calibration value left’.
Repeat the process to verify the calibration.
 
8.  Once the calibration is done, the vehicle baseline height can be adjusted to the user require-
ments. Navigate to ‘Height’-
>   
Adjust Front’, ‘Height-
>Adjust Rear’ or ‘Height-
>Adjust All’ and use 
the Speed + / Menu up and Speed - / Menu down buttons to adjust the value. 
These are the original baseline heights for your vehicle. Tire size has no effect when measuring from 
the center of the wheel.
Original Standard height values  Front (mm) Rear (mm)
Wheel Center to lower edge of wheel arch 466 485
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009D3- 
						

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IIDTool
6. Service/Test 
 
Defi nition
This section gives access to service routines available for a system or ECU. For example, the suspen-
sion defl ation functions are service routines. 
 
WARNING
Service Routines should only be performed by qualifi ed users 
with appropriate mechanical and electrical knowledge. Make 
sure no objects or people are near any components or systems 
related to the service routine.
Serious damage or injury can occur if the procedure is perfor-
med improperly! GAP Diagnostics assumes no liability for da-
mages or injuries incurred during use or resulting from the use 
of the IIDTool. 
When entering this menu, the ECU list will now be displayed. The menu is navigated up and down with 
the Speed + / Menu up and Speed - / Menu down buttons. Choose an ECU and press Resume / Enter 
to select. The fi rst service routine for this ECU is now displayed. Scroll up and down to view another 
service routine.
In some cases, the display does not have enough characters to display the whole service routine 
name. In these cases, it is scrolled through.
Notes:  
•  The IIDTool enters the ECU list at the bottom – The list is not in alphabetical order. 
•  It is normal to see warning light(s) turning ON when performing a service routine.
•  While not mandatory, we strongly suggest clearing fault of all ECU’s after performing a service 
routine. If you have faults currently stored that you would like to note, perform a read fault prior 
to viewing live values and clearing.
•  Some service routines will not work if faults are stored in the ECU.
For more details about individual service routine procedures, please consult Section V of this 
user manual.
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009D3- 
						

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IIDTool
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009
7.  Live Values
 Defi nition
This function allows viewing the current value or state of a sensor or actuator. For a complete list of live 
values for your vehicle, please consult the functionality list on the IIDTool’s webpage.
To allow viewing of live values by the passenger, the value selected prior to driving the vehicle will 
stay displayed while the vehicle is on the move. For safety reasons, the IIDTool will not respond to any 
commands from the cruise control buttons while on the move. When the vehicle comes to a halt, the  
cruise control commands will become operative and navigation can resume.
 
WARNING
The driver should never observe a live value while driving. For 
safety reasons, only the passenger should read a live value while 
the vehicle is on the move.
Before viewing live values, please read the notes at the end of 
this page.
 
When entering this menu, the ECU list will now be displayed. The menu is navigated up and down with 
the Speed + / Menu up and Speed - / Menu down buttons. Choose an ECU and press Resume / Enter 
to enter. The fi rst live value for this ECU is now displayed. Scroll up and down to select other values.
As the display does not have enough characters, the description (i.e. Battery Voltage) is scrolled 
through. The value displayed (11.520V) is not scrolled.
Notes:  
•  The IIDTool enters the ECU list at the bottom – The list is not in alphabetical order. 
•   
 Only the name of the live value will fi rst be displayed and scrolled if necessary. After a few 
seconds, the value or status will appear on the right with its associated unit in the metric system. 
•  On certain ECU’s, it is normal to see warning light(s) turning on when viewing live values.
•  When broadcasting live values, some ECUs will stop sending messages on the networks. As a 
result, other ECUs will interpret this as a communication error. While not mandatory, we strongly 
suggest performing a clear fault of all ECUs after viewing live values. If you have faults currently 
stored that you would like to note, perform a read fault prior to viewing live values and clearing.
D3- 
						

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IIDTool
Viewing live values using the mobile App (from V2.0)
  Live value selection and sampling rate 
You can select up to 8 live values in the graph and 4 in the numeric display which can be viewed 
simultaneously. The sampling rate of each live value is divided by the number of live values selected. 
For example, if one live value is selected, the sampling rate will be 16 per seconds / 1 live values = 16 
samples per seconds. If 4 values are selected, 16 / 4 = 4 samples per seconds for each live values. 
The absolute maximum sampling rate of each live value is determined by the ECU.
 Basic controls
 Full screen / normal screen button
 This button will start the recording of live data. 
Once the stop button is pressed (same location), 
user will be able to save and name the recording 
if necessary. Saved logs can be accessed by se-
lecting View Log in the Live Value submenu.
  Graph view options
Press in the yellow area to make the top option bar appear.
D3-
GAP Diagnostic 7/15/2014 All right reserved
User manual: Version 8, Firmware V3.0
Land Rover Discovery 3/LR3, Range Rover Sport 2004-2009