ME-SFI control unit, ME-SFI fault code description - AD07.61-P-4000-91L

		ME-SFI control unit, fault in function monitoring
1	Fault code	P203B First fault occurring in function monitoring (P0221)
1	( Display on generic scan tool)	P203C Second fault in function monitoring with highest priority (P0221)
2	Fault storage	After expiry of test duration and fault
2	Activation of the engine diagnosis indicator lamp (EURO3/4) or CHECK ENGINE (MIL) malfunction indicator lamp	Following two successive driving cycles with faults
3	Checking frequency	Continuous
4	Checked signal or status	Functions in ME-SFI control unit
5		Replace the ME-SFI control unit in the event of a fault. If faults are also stored for the hot film MAF sensor, first check the hot film MAF sensor. The following faults are detected: Fault in engine torque monitoring Fault in injection sequence monitoring at cylinder shutoff Fault in locking time monitoring for cylinder shutoff Fault in air mass monitoring Fault in cruise control switch/variable cruise control switch monitoring Fault in stop lamp switch monitoring Fault in ETC monitoring Fault in Distronic monitoring Fault in ESP monitoring Fault in pedal value sensor signal monitoring Fault in throttle valve actual value potentiometer monitoring Fault in speed signal monitoring Fault in ignition angle monitoring Fault in electronic accelerator pedal false reaction monitoring Fault in A/D converter for pedal value sensor signal monitoring.
6		Function monitoring protects the electronic accelerator pedal in order to prevent any false reactions such as sudden acceleration. The limp-home mode function is activated in the event of a fault Function monitoring in the ME-SFI control unit works in parallel with and independently of the actual function computers. A fault is stored if deviations between function monitoring and function computers become too large. A fault is stored for Distronic, ESP, ETC, stop lamp switch and selector lever module only where no faults are detected at the associated components and CAN signals.