P1CBF FIAT – Hydraulic Pump Feedback

P1CBF FIAT Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1CBF FIAT Possible Causes

Faulty Smart Driver Unit (SDU),Smart Driver Unit (SDU) harness is open or shorted,Smart Driver Unit (SDU) circuit poor electrical connection,Faulty Transmission Control Module (TCM)

P1CBF FIAT Description

This diagnostic checks the performance of the hydraulic pump. The Smart Driver Unit (SDU) which is external to the Transmission Control Module (TCM) drives the hydraulic pump based upon a PWM command signal received from the Transmission Control Module (TCM). This diagnostic uses three feedback signals. The PWM driver, internal to TCM, returns a command feedback signal. The SDU returns to the TCM the hydraulic pump driver feedback signal. The TCM separately receives the hydraulic pump feedback signal confirming the pump state. This diagnostic checks the performance of the hydraulic pump.