Diagnostic instruments
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DDS diagnosis instrument
The main functions of the DDS diagnosis instrument can be summarised as follows:
-Retrieval of errors (faults) of the ignition-injection system stored in the engine control unit memory and their subsequent
deletion, if required.
-Reading of engine parameters (rpm, coolant and air temperature, atmospheric pressure, throttle opening, battery
voltage, injection times and ignition advance, etc.).
-Active diagnostics. Activation of ignition-injection system transducers to test functionality and control signals (fuel pump,
ignition coils, rev counter, injectors, etc.). With this function it is also possible to enter the code to override the
immobilizer.
-Road test. Allows the technician to store engine parameters recorded within a previously specified engine speed range
interval. The resulting parameters can then be analysed and displayed once they have been acquired.
-With specific sensors connected, the DDS diagnosis instrument can read electrical voltages, current, temperature, timing
belt tension, and pressure values (lubrication and fuel supply circuits for example).
Checking and adjusting timing belt tension
Note
The on-screen icons used during this procedure are explained in a table at the end of this section.
Note
This operation, which is performed using the DDS diagnosis instrument, has the advantage that it can be carried out on
both timing belts with the engine still installed on the frame. Connect an optical reader (5) to the DDS part no.
88765.1371. The optical reader has a green LED that serves to determine that the reader is correctly positioned in front
of the belt to be tested. It is also equipped with an infrared transmitter (A) and receiver (B) designed to detect
oscillations of the belt when caused to vibrate with the flick of a finger.
Unscrew the lambda sensor (6), undo the clamp (7), loosen nuts (8) and remove the exhaust pipe (9).
Remove the spark plug caps (10).
Unscrew the screws (11) and remove the side covers (12).
Remove the spark plugs.
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