BMW 1989-1995 525i Service Manual page 239

AU TOMATIC TRANSMISSION
Table b. Automatic Transmission Troubleshooting
240-3
Symptom Probable cause Corrective action
1. Park does nOI hold a. Selector lever li nkage misadjusted. a. Adjust selector lever linkage . 250 Gearshift Li nkage
b. Parking pawl or pawl spring broken. b. Transmission must be removed and part ially disassembled to
access parking pawl.
2.
No Drive (car will a. ATF level low. a. Check and if necessary correct ATF level. See ATF serv ice
not move)
b
. Selector lever linkage misadjusted.
b .
Adjust linkage. 250 Gearshift Linkage
c. Sticking pressur e valves. faulty ATF c. Test ATF main pressur e. See DIagnostic Tests
pump. or broken gear or shaft.
3.
Irregular drive in all a. ATF level low. a. Check ATF level. See ATF serv ice
forward gears
b. ATF pump strain er (liiter ) parlially b. Remove ATF sump. Clean or replace filter screen.
clogged. See ATF service
c. Transmission range switch faulty. c. Replace transmission range switch. See Transmissio n Service
d.
Internal transmission damage.
d.
Overhaul or replace transm ission.
4. Transmission slips a. ATF level low. a. Check ATF level. See ATF service
during corner ing b. Clogged ATF strainer. b. Clean/replace strainer. See ATF service
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5. ATF smells burned. a. Damaged clutch friction linings. a. Overhaul or replace transmission.
dark colored internal faults
6. Selector lever will a. Selector lever linkage binding
a.
Check and adjust linkage. 250 Gearshift Linkage
not move
b.
Interna l transmission failure.
b. Overhaul or replace transmission.
c.
Shift-lock faulty (if applicable). c. Check shift-lock solenoid. See 250 Gearshift Linkage
7.
Hard jolt when a. Idle speed too high a. Check engine idle speed. See 130 Fuellnjectlon-DME
moving selector
b. ATF level low. b. Check and correct ATF level. See ATF service
lever from N
c. Faulty transmissi on range switch. c. Replace transm ission range switch . See 250 Gearshift Linkage
to 0 or R
d.
Internal transmission fault. d. Overhaul or replace Iransm ission
a.
Hard jolt on upshift a. Faulty ctutchtes). a. Overhaul or replace transm ission
or downs hift
b.
Valve body faulty.
b.
Replace valve body. Dealer service recommended
c. Transmission e tectronics faulty. c. Check transmission electronic controls. Dealer service recom-
mended
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9.
Vibration when a. Driveshalt vibration. a. Check driveshaft u -joints. driveshaft center bearing. driveshalt
accele rating quickly alignment. See 260 Drlveshaft
from a stop
b . Faulty clutch(es). b. Overhaul or replace transm ission. Dealer service recommended
10. Car cannot be a. Faulty transmission range switch. a. Replace transmission range switch, See 250 Gearshift Linkage
started in N or P
11. No upshift into 2nd.
a.
Faulty transm ission range switch . a. Replace transmission range switch. 250 Gearshift Li nkage
3rd or 4th gear
b.
Transm ission electronics faulty
b.
Test valve body solenoid operation. Dealer service tecom -
(valve body solenoid faulty). mended
c. Valve body faulty. c. Replace valve body. Dealer service recom mended
d. Transm ission electron ics faulty. d. Check transmission electronic controls. Dealer service recom-
mended
e.
Valve body solen oids faulty. e. Repair or replace valve body. Dealer service recommended
12. Upshift delayed in a.
ATF level low.
a.
Check and correct ATF level. See ATF service.
all gears
b.
Valve body con taminated or plugged.
b.
Remove valve body and clean or replace.
Dealer service reco m-
c. Internal pressure valves sticking or mended
faulty. c. Overhaul or replace transmission.
d.
Transmission e lectronics faulty.
d.
Check transmission electronic controls. Dealer service recom-
mended
TROUBLESHoonNG