Reducing idling vibrations by changing idling speed
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SERVICE INFORMATION
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Bulletin Nbr:
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248-1824
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Date:
...........
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NOVEMBER 1997
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Market:
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EJ US, CA
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Reducing idling vibrations by changing idling speed
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Saab 900 from VIN V2048171 (3D/5D) and V7014757 (CV) respectively, with Trionic without OBD II, automatic transmission.
Vibrations at idling speed on some cars when the gear selector is in position D may be disturbing. In the event of customer complaint, the idling speed can be increased using Tech 2 with version number 20.000 or higher. The increase is made in steps of 10 rpm up to max. 50 rpm. The increased rpm can reduce vibrations but will only remain as long as the battery is connected. Once the battery has been disconnected, the rpm will return to normal speed.
Warning
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An increased rpm entails lower vacuum, which means that the brake pedal must be pressed down harder.
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Before starting work, the situation in which the customers experiences the problem must be recreated.
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2.
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Connect TECH 2 to the data link connector under the steering wheel.
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3.
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Select Diagnostics and press ENTER.
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4.
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Select 1998 and press ENTER.
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5.
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Select 900 and press ENTER.
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6.
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Select Engine and press ENTER.
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7.
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Select Trionic and press ENTER.
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8.
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Select Adjustment and press ENTER.
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9.
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Select Offset, idling speed in Drive and press ENTER.
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11.
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Put the gear selector in position D.
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12.
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Adjust the rpm until the best result is obtained.
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Important
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The value must be confirmed with OK before the electronic control module is programmed and the changed rpm can be noticed.
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13.
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Conclude the procedure and disconnect TECH 2.
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Important
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When the battery is disconnected, the idling speed returns to normal.
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14.
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Notify the customer that the idling speed of the car has been changed and if the rpm has been increased that the brake pedal may require more pressure to obtain necessary braking power.
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