Retarder (RET), diagnosis, function check · ad4340l3000a · Mercedes-Benz WIS

AD43.40-L-3000A

Retarder (RET), diagnosis, function check

20.1.98

MODELS 668.323 /353, 670.323 /324 /353 /373 /374 with ENGINES 904.908 /914 /923 /936
with CODE (B02) Brake system, anti-lock brake system (ABS)
with CODE (B16) 2-circuit hydraulic brake/2-circuit compressed air brake
with CODE (BR3) CC 80 retarder
with CODE (BR5) Combined manual and foot-operated switch for retarder

	Retarder (RET), diagnosis, previous knowledge		AD43.40-L-2000A
	 Battery voltage 22.5 up to 29.5 V  The electrics have been checked in accordance with the owner's manual for the vehicle and found to be in order
	Function check
Scope of test	Operation/requirement	Specification	Possible cause / Remedy
1 Relay in relay box	Ignition: ON  Switch hand switch through all braking stages	Retarder malfunction indicator lamp illuminates, Relays switch audibly	AD43.40-L-6000A
	 Move hand switch to 0 position and switch foot-operated switch through braking stages one after the other	Retarder malfunction indicator lamp illuminates, relays switch audibly	AD43.40-L-6000A
2 Retarder	Vehicle in motion  Switch hand switch through all braking stages	Retarder malfunction indicator lamp illuminates Retarder brakes correctly in all braking stages	AD43.40-L-6000A
	 Move hand switch to 0 position and switch foot-operated switch through braking stages one after the other	Retarder malfunction indicator lamp illuminates Retarder brakes correctly in all braking stages	AD43.40-L-6000A

Referenced documents

ad4340l2000a Retarder (RET) diagnosis, previous knowledge
ad4340l6000a Retarder (RET) electrical system test