L322 Range Rover System Description and Operation
INSTRUMENTS
DESCRIPTION AND OPERATION
88-29
Test Function No. 14 – Read Self Diagnostic Error Bytes
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This function is locked and needs to be unlocked via the procedure in Function Test No. 19. Errors are stored in
the EEPROM in the form of bytes and are displayed in hexadecimal form. The maximum five errors can be
scrolled through using the trip reset button and are displayed as follows:
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'DIAG: 1 90 84 040' – the first number shows the error location number 1 - 5. The following numbers show
error source code, type of error and frequency of error occurrence.
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TestBook/T4 must be used to interrogate the EEPROM and convert the hexadecimal values into meaningful error
descriptions.
Test Function No. 15 – Display of Input/Output Port Status
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This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The individual ports
can be scrolled through using the trip reset button.
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'PORT: A03 11010001' – shows the inputs and outputs for microprocessor 1 in binary format.
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'PORT: B01 01001110' – shows the inputs and outputs for microprocessor 2 in binary format.
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This function allows for rapid vehicle diagnostics by displaying the status of each microprocessor inputs and
outputs in binary format. TestBook/T4 must be used to read the binary code and interpret the code meanings.
Test Function No. 16 – Momentary Value for Engine Oil Temperature
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This function is locked and needs to be unlocked via the procedure in Function Test No. 19.
This function shows the momentary value for the engine oil temperature which is updated every 200 milliseconds.
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'OELTMP: 83
°
C'
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The ignition must be in position II for the oil temperature to be displayed. The value is derived from a CAN
message transmitted from the ECM. If an error occurs, the maximum displayable temperature of 207
°
C is
displayed. The display is only available if set in the coding, if not, only dashes (- - -) are displayed.
Test Function No. 17 – Minute Counter for Radio Controlled Clock
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This function is allocated for future use. Therefore the following blank message appears: 'RCC-EMPF.: - - - MIN'.
Test Function No. 18 – Dimming Parameters
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This function is locked and needs to be unlocked via the procedure in Function Test No. 19. This display
comprises a block of six numbers which define the operating parameters of the instrument pack dimmer.
Test Function No. 19 – Lock/Unlock
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The unlock code is known as a checksum of the VIN. The VIN can be obtained from Test Function No. 1. The
numbers of the VIN are added together and the resulting figure equals the checksum. For example, if the VIN is
XA37295 the checksum will equal 26, which in turn equals the unlock code.
Enter the unlock as follows:
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When test function No. 19 is entered, 'LOCK : ON' is displayed
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Press the trip reset button once, 'LOCK : 00' is displayed
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Press the trip reset button until the unlock checksum is reached, i.e. 26
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Press the check control button once, all test functions will be unlocked.
NOTE: All test functions will remain unlocked, even when the ignition is switched off.
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Relock the test functions as follows:
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Go to test function No. 19 and press the trip reset button, 'LOCK : OFF' is displayed
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Press the trip reset button a second time, 'LOCK : ON' is displayed
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Press the check control button or switch the ignition off to relock the test functions.