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Home >> Volvo >> 1999 >> V70 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - S70 & V70 Non-Turbo >> Diagnostic Tests >> P1019/ECM-902A: Throttle Unit Communication Problems >> Fault Conditions

Fault Conditions

Control modules communicate with each other in a network via a standardized serial communication method - Controller Area Network (CAN). ECM has registered a fault in communication on CAN network. CAN signal from throttle unit is missing or not updated. ECM-902A is stored in ECM.

No substitute value is used. Accelerator pedal is ignored when braking Cruise control cannot be activated. RPM is limited using fuel shut off. Maximum permitted engine speed depends on accelerator pedal position. Throttle unit follows pulse width modulation accelerator pedal signal directly and control signal via CAN is ignored.

ETS warning lamp lit while ECM-901A is set. DTC can also cause uneven idle and jerking during engine braking.