Electronic transmission control (ETC) diagnosis, troubleshooting, power transmission - AD27.19-P-5006A

TRANSMISSION 722.6 in MODELS 129, 140, 163, 170, 202, 208, 210

	Electronic transmission control (ETC), diagnosis, previous knowledge		AD27.19-P-2000A
	Troubleshooting
Complaint	Possible cause	Note	Remedy
Hardness 2 → 1 stationary downshift	Transmission adaptation (adapting of ETC)		AD27.19-P-3000-04A
	ETC software dating		AD27.19-P-5006-01A
	Freewheel F1		AD27.19-P-5006-01A
Hardness 3 → 2 stationary downshift (occurs again after new adaptation)	Clutch K3	all models with engines 119, 120 to transmission end no. 27083	AD27.19-P-5006-05A
No or delayed upshift	Different tire sizes mounted to the front axle.		Mount standard tire sizes to the front axle.
No upshift 3 → 4 and 4 → 5 at fast-of), only in transmission mode "S"	Upshift prevention at dynamic driving style	Inform customer
No upshift into 5th. gear at full throttle or kickdown	Upshift 4 → 5 always takes place at full throttle or kickdown just before the engine breakaway speed is reached. Very powerful vehicles under these conditions don't shift into 5th gear until 250 km/h.	Inform customer
No upshift from 1st gear (transmission mode "S") and 2nd gear (transmission mode "W") at n < 5000 RPM -1, cold. Fault cannot always be reproduced	Gear recognition switch (S16/10) and/or ETC		Send part for diagnosis to VSE/PB
Engine runs away when shifting from 2 → 3 and/ or has a hard downshift from 3 → 2	Oil level Oil filter Freewheel F2	Inspect oil level in automatic transmission, top up if necessary Freewheel F2 changed from plain bearing to ball bearing as of 6/99 Transmission end no. 01574575	AD27.19-P-5006-02A AR27.00-P-0101A Repair automatic transmission
Juddering 2 → 3 deceleration or 3 → 2 "B" mode	Oil level Oil filter Control, shift or command valve Clutch disks K3	Inspect oil level in automatic transmission, top up if necessary	AD27.19-P-5006-03A AR27.00-P-0101A
No kickdown, downshift	Specified pedal value < 95% (test using HHT)	all models with engine 111	Check engine control, correct if necessary
Delayed cutting-in process / no positive connection in "R" and/or "D", and temporary	possible causes at fault which is not always reproducible Oil level Gear recognition switch (S16/10) Oil filter Delayed pressure buildup at B2/B3 pistons Assignment ETC control module/EHS electrohydraulic control unit	Inspect oil level in automatic transmission, top up if necessary Dismantle and assemble floor shift	AD27.19-P-5006-04A AR27.00-P-0101A AR27.60-P-0920B
	possible causes at fault which is always reproducible Joint flange collar nut is loose Piston B2/B3 Shift pressure regulating solenoid valve (Y3/6y2) Modulating pressure control solenoid valve (Y3/6y1) Control, shift or command valve Circlips	Remove, install multiple-disc brake B2, multiple-disk pack B3 and park pawl gear Disassemble and assemble multi-disk brake B2.	AR27.50-P-0781A AR27.50-P-0880A
Hardness stationary downshift 4 → 3, shortly before vehicle standstill	Intermediate panel of EHS electrohydraulic control module	Only in selector-lever position "D" or "4"; not in position "3" or "2" Only to transmission end no. 0527574, thereafter intermediate panel in series modified	Replace EHS intermediate panel, part no. (140 277 39 14)