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WesTech Technical Information - Jaguar Code Retrieval
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Accessing Diagnostic Trouble Codes

LUCAS MICROFUELING ELECTRONIC FUEL INJECTION

The ECU is capable of self-diagnosis. In the event of a fuel injection system failure, the words FUEL and FAIL will be displayed alternately on the trip computer. The diagnostic trouble code (DTC) will be stored in ECU memory, allowing the vehicle to be driven carefully until repairs can be made.

To obtain stored diagnostic trouble code, switch ignition Off, then On. After approximately 10 seconds, one or more diagnostic trouble codes will be displayed.

LUCAS ENGINE MANAGEMENT ELECTRONIC FUEL INJECTION

In the event of an engine management fault occurring, the "Check Engine" lamp will be illuminated. Additional information can be displayed by pressing the Vehicle Condition Monitor (VCM) button located on the trip computer panel.

When a malfunction occurs, the appropriate diagnostic trouble code will be retained in ECU memory. The "Check Engine" lamp will stay on until the malfunction is repaired and the ECU memory is cleared.

When a fault has been signaled, the likely area responsible for the malfunction can be indicated when the vehicle is stationary. Switch off ignition for a minimum of five seconds, then turn ignition to position II (do not start engine) and press VCM button. This will cause trip computer to illuminate the applicable diagnostic trouble code. The diagnostic trouble codes are displayed in order of priority, one at a time. The next DTC is only displayed when the first DTC is repaired or cleared from memory.

MARELLI ENGINE MANAGEMENT SYSTEM

Place ignition switch in the Off position for five seconds, then turn ignition switch to the No. 2 position without starting engine. Press VCM (Vehicle Condition Monitor) button. This will cause the VCM/Trip monitor computer to display the applicable diagnostic trouble code.

CLEARING DIAGNOSTIC TROUBLE CODES

After service, the diagnostic trouble code's retained in the ECU memory must be cleared by disconnecting the battery ECU pin ground cable or cleared by Jaguar diagnostic.


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