Abbreviations

	OBD - Onboard diagnostics
	ZF AVS automatic gearbox EST 14
	Fault listing
	Display indication Fault no. Effects on the system Behaviour notes/safety notes   N,  31 Applies only to engine braking safety via the AVS system: - no engine braking function - engine cannot be stopped using the engine brake Stop engine => see operating manual section 3.4.2, B version. Attention! In the event, switch back quickly   N,  32, 52 Applies only to ignition locking via the AVS system: Stop engine => see operating manual section 3.4.2, B version.   N,  36 No "hold clutch" function Wait for return pulse on clutch pedal. Attention: If you engage the clutch before this pulse, power will not be transferred (display indication "KU")   N, Stop,  51 Applies only to engine braking safety via the AVS system: - no engine braking function - engine cannot be stopped using the engine brake engine brake on permanently Stop engine => see operating manual section 3.4.2, B version. Attention! In the event, switch back quickly   N, Stop,  28, 41, 43, 45, 46, 47, 48 Gear does not engage Drive to nearest workshop on emergency power   N, Stop,  56 Clutch will sometimes fail to engage. Gear does not engage Clutch engages: Drive to nearest workshop on emergency power. Clutch does not engage: You cannot continue the journey, call for a tow   N, Stop,  61, 67 There is no display indication when the clutch is depressed If it is engaged, the display indication is "KU" Check air pressure. Otherwise, continue driving with substitute driving programme   N, Stop,  81 Gear does not engage If, after operating the drive switch (Off - On) no gear engages, you can only continue driving on emergency power. Drive to the nearest workshop.   N 35, 55 No return pulse to the clutch pedal You can continue driving. Note the display indication Engage the clutch when the new gear is displayed   N 62, 63, 64, 65 Gear does not engage Check air pressure. Otherwise, continue driving with substitute driving programme   N 75, 76 Gear does not engage Drive to nearest workshop on emergency power   N 91, 92, 93 No effects You can continue driving. Have the fault repaired   34, 54 Lamp for substitute driving programme does not light or stays on You can continue driving. Have the fault repaired   71, 72, 73, 74 AVS driving programme not set to optimum You can continue driving. Have the fault repaired   77 Drive signal absent You can continue driving. You can only switch back to the maximum rated rpm   78 Drive signal absent Increased switching time for start gear Reverse gear can only be engaged using the drive switch (Off - On) when the vehicle is stationary   N,  84 Incorrect control unit You can continue driving. You can only switch back to the maximum rated rpm   N,  88 Substitute driving programme is activated For use, see operating manual section 5   N,  21 First gear cannot be engaged Drive to nearest workshop on emergency power   N,  23 1. and 5th gear cannot be engaged You can continue driving with manual gear preselection. Attention! 1. First gear cannot be preselected   N,  24 2. and 6th gear cannot be engaged You can continue driving with manual gear preselection. Attention! 2. Start gear cannot be preselected, 1st gear is preselected   N,  25 3. and 7th gear cannot be engaged You can continue driving with manual gear preselection.   N,  26 4. and 8th gear cannot be engaged You can continue driving with manual gear preselection.   N,  27 Reverse gear cannot be engaged Reverse gear can be engaged with emergency switching