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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #1  
Old 07-03-2010
Rob Robinson's Avatar
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Default HELP - 90 PT Won't Shift

Just got a call from a chap down Alabama way whose 1990 PT won't shift into gear. We'd like to help him out so I'd like to know if there is a procedure for getting a transmission code readout for the 90 PT. Also if there is a code readout does anyone have the info on what each code means. This fellow is stranded so any help would be appreciated.
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  #2  
Old 07-03-2010
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I e-mailed the code list below to Rob, but I'm posting here as well.

The 90 has a 755, which is the same as several later years, so not a unique 90 thing. There is a "Check Transmission" switch with light to the right of the key pad. On mine that does nothing, so I'm not sure of its working. The only time I've had transmission problems it was due to low voltage, and the "Do not shift" light came on.

ATEC SYSTEM FAULT INDEX
1.
CODE 12 Low Oil Level
2-818
.................................................. .............................
2.
CODE 13 Low Battery Voltage
2-828
.................................................. .....................
3.
CODE 14 Forward Pressure Switch Inoperative
2-834
.................................................
4.
CODE 15 Reverse Pressure Switch Inoperative
2-842
.................................................
5.
CODE 21 Throttle Sensor Inoperative
-850
.................................................. ............
6.
CODE 22 Speed Sensor Inoperative
-862
.................................................. ..............
7.
CODE 23 Shift Selector
-870
.................................................. ...............................
8.
CODE 24 Oil Temperature (High Limit Exceeded)
-884
............................................
9.
CODE 32 Transmission Direction Signal
-886
.................................................. ........
10.
CODE 33 Oil Temperature Sensor Inoperative
-896
..................................................
11.
CODE 34 Prom Check
-904
.................................................. ................................
12.
CODES 41 Through 45 And 51 Through 53:
Solenoids J, F, D, C, B, A, G, E, Or H Inoperative
-908
.................................................
13.
CODE 46 Solenoid A Inoperative
-914
.................................................. .................
14.
CODE 54 A, B, C, D, F, And J Solenoid Off Test
-920
...............................................
15.
CODE 69 Electronic Control Unit (ECU) Failure
-930


Clear ATEC codes.
(a)
Turn OFF ENGINE switch (TM 9-2320-364-10).
(b)
Place a jumperwire between terminals A and B on DDL connector MC13.
(c)
Start engine (TM 9-2320-364-10).
(d)
Observe "TRANS CHECK" light for codes being flashed.
(e)
Apply brake and shift the transmission in the following sequence:
1
N (Neutral).
2
D (Drive).
3
R (Reverse). (Leave in reverse until "TRANS CHECK" light stops flashing, approximately
five seconds).
4
N (Neutral).
(f)
If "TRANS CHECK" light stops flashing, codes have been cleared and fault corrected.
(g)
If "TRANS CHECK" light continues flashing, fault has not been corrected.
(h)
Turn OFF ENGINE switch.
(i)
Remove jumperwire
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  #3  
Old 07-03-2010
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Don I've passed your info on the the fellow. Apparently, like yours, his tranny check light doesn't work either. I've told him to begin by checking and cleaning the cannon plugs, checking for 12V at the ECM and insuring clean and tight battery connections.
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  #4  
Old 07-03-2010
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Just a silly question here: Are his idle RPMs and transmission fluid levels right?
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  #5  
Old 07-03-2010
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Rob: Have the chap start the generator...if his problem is low voltage to the ECM, starting the generator may increase the voltage enough to allow the transmission to shift. Just my small contribution; good luck.
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Old 07-03-2010
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don't forget the ground strap going to the transmission,its on the curb side and bolts onto the filter bracket,where we have alum,copper and steel all in one connection,think its a good connection? NO!

Also,Rob,didnt you mention they replaced the batteries and hooked them up backwards or something?
Is there a fuse on the TCM?
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