Code 48: Idle Air Control Valve Fault

Check base idle speed. See appropriate ON-VEHICLE ADJUSTMENTS article. If base idle speed is okay, test idle speed stepper motor. Perform Test "M". See Fig 1 and Fig 2 . After completing the tests, retest the vehicle to ensure the faults have been rectified. If faults still persist, recheck using Lucas Diagnostic Equipment or Test Book.

Fig 1: Idle Air Control Valve Fault Test "M" (1 Of 2)

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Fig 2: Idle Air Control Valve Fault Test "M" (2 Of 2)

Courtesy of LAND ROVER NORTH AMERICA, INC.