P1643 FIAT Engine Speed Output Circuit
Possible causes
– Reprogram computer – Faulty ECM
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1643 FIAT Description
There is a communication problem with Control Area Network (CAN) link from the Engine Control Module (ECM)to the Transmission Control Module (TCM)
Citroen Vehicle:Fiat 500,Fiat Bravo,Fiat Croma,Fiat Grande Punto,Fiat Idea,Fiat Weekend,Fiat Panda