JWales Posted June 6, 2020 Share Posted June 6, 2020 I have a 1999 RD688s. Started the truck last week and noticed the tach not working, then the accelerator also not working. The truck was idling a little fast. When I turned the truck off it took 15 to 20 seconds for the truck to shut off. I called my local Mack dealer and they said throttle sensor under the accelerator pedal probably the culprit. I ordered a new one and changed it. No change in the truck. Any suggestions? Quote Link to comment https://www.bigmacktrucks.com/topic/62811-1999-rd688s/ Share on other sites More sharing options...
fjh Posted June 6, 2020 Share Posted June 6, 2020 Check the vehicle ecu locate under the passenger kick panel it may have had leaking windshield and water has gotten in the main plug. Quote Link to comment https://www.bigmacktrucks.com/topic/62811-1999-rd688s/#findComment-452757 Share on other sites More sharing options...
JWales Posted June 7, 2020 Author Share Posted June 7, 2020 Do I need to disconnect the batteries before I in plug it? Quote Link to comment https://www.bigmacktrucks.com/topic/62811-1999-rd688s/#findComment-452840 Share on other sites More sharing options...
JWales Posted June 8, 2020 Author Share Posted June 8, 2020 I have cleaned the connection and no difference. Quote Link to comment https://www.bigmacktrucks.com/topic/62811-1999-rd688s/#findComment-452909 Share on other sites More sharing options...
Deunis Posted October 16, 2023 Share Posted October 16, 2023 On 5/6/2020 at 21:40, JWales said: Tengo un RD688 del año 1999. Arranqué el camión la semana pasada y noté que el tacómetro no funcionaba y luego el acelerador tampoco funcionaba. El camión estaba ralentí un poco rápido. Cuando apagué el camión, tardó entre 15 y 20 segundos en apagarse. Llamé a mi distribuidor local de Mack y me dijeron que el sensor del acelerador debajo del pedal del acelerador probablemente era el culpable. Pedí uno nuevo y lo cambié. No hay cambios en el camión. ¿Alguna sugerencia? Hello, did you find the problem? The same thing is happening to me, what solution did you find? Quote Link to comment https://www.bigmacktrucks.com/topic/62811-1999-rd688s/#findComment-540424 Share on other sites More sharing options...
tjc transport Posted October 16, 2023 Share Posted October 16, 2023 he has not logged on in over three years. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/62811-1999-rd688s/#findComment-540431 Share on other sites More sharing options...
Joey Mack Posted October 16, 2023 Share Posted October 16, 2023 You rekon he needs to start a new thread, and use English? Just askin'... Quote Link to comment https://www.bigmacktrucks.com/topic/62811-1999-rd688s/#findComment-540434 Share on other sites More sharing options...
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