Diagnostic instruments
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The socket to which the cable (Measurement Module) (17) is to be connected is indicated on the screen with a capital
letter: A, B or C.
Flick the belt lightly with your finger and read the frequency value (Hz) on the DDS diagnosis instrument.
Note
Do not stress the belt several times repeatedly, since the necessary minimum time for the DDS diagnosis instrument to
take a reading is 1 second.
The tension values are those detailed in Sect. 3 - 1.1,
Timing system/valves and must be checked when the engine is
cold: apply the installation values when fitting a new belt, and the reset values when belt tension reaches 70 Hz.
Warning
The timing belts can become slack during normal operation. When checking belt tension, if the reading is less than 70 Hz,
restore to the specified nominal values (Sect. 3 - 1.1,
Timing system/valves).
If the tension value is incorrect, tighten or slacken the belt by loosening the screws (19) and moving the tensioner
pulleys.
Manually raise the tensioner pulley (20) to increase belt tension or lower it to reduce belt tension.
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