[Whizbang]

Troubleshooting (Auto Transmissions)

Chart of Inspections (w/o disassembly)
A. ATF quality
B. Range selector linkage
C. Inhibitor switch and wiring
D. Vacuum diaphragm and piping
E. Kickdown solenoid, switch and wiring
F. Engine idling speed
G. Oil Pressure
H. Engine Stall Speed
I. Rear lubrication
J. Control valve
K. Governor valve
L.. Band servo
M. Transmission air check
N. Fluid inspection
O. Ign. switch or start motor
P. Engine adjustment and brake inspection

Chart of Inspections (after disassembly)
1. Rear clutch
2. Front clutch
3. Brake band
4. Low and reverse brake
5. Oil pump
6. Hydraulic circuitry
7. Torque converter one-way clutch
8. Power train one-way clutch
9. Parking gear mechanism
10. Planetary gear


***inspections for probable causes are in order from most likely to least likely***

Q. Engine does not start in "P" or "N"
A. Probable causes: O, B, C

Q. Engine starts in ranges other than "P" or "N"
A. Probable causes: B, C

Q. Excessive "N" to "D" range shift shock
A. Probable causes: F, D, G, J, 1

Q. Vehicle does not move in "D" but does in "1, 2, R"
A. Probable causes: B, G, J, 8

Q. Vehicle does not move in "1, 2, D" but does in "R" / Very poor acceleration
A. Probable causes: A, B, N, G, J, M, P, 1, 6, 2

Q. Vehicle does not move in "R" but does in "1, 2, D" / Very poor acceleration
A. Probable causes: A, B, G, N, J, M, 4, 2, 1, 6

Q. Vehicle does not move in any range
A. Probable causes: A, B, G, N, J, M, 5, 6, 9

Q. Power transmission slippage felt when starting
A. Probable causes: A, B, G, N, J, D, M, 5, 6

Q. Vehicle moves in "N" range
A. Probable causes: B, N, J, 1

Q. Low max. speed / Poor acceleration
A. Probable causes: A, B, N, G, H, L, J, P, 3, 4, 1, 2, 5

Q. Vehicle braked when "R" range selected
A. Probable causes: N, M, L, 1, 3, 9

Q. Excessive creep
A. Probable causes: F

Q. No creep at all
A. Probable causes: A, B, F, N, J, 5, 6, 1, 2

Q. Does not shift from 1st to 2nd gear
A. Probable causes: B, D, E, N, J, K, M, L, 3, 6

Q. Does not shift from 2nd to 3rd gear
A. Probable causes: B, D, E, N, J, K, M, L, 2, 6

Q. Excessively high 1-2, 2-3 shift points
A. Probable causes: D, E, G, N, J, K,

Q. Shift directly from 1 to 3
A. Probable causes: N, J, M, K, 3, 6

Q. Excessive 1-2 shift shock
A. Probable causes: D, H, N, J, L, 3

Q. Excessive 2-3 shift shock
A. Probable causes: D, G, J, M, L, 2

Q. No 1-2 shift shock or slippage
A. Probable causes: A, B, D, G, N, J, M, L, 3, 6

Q. No 2-3 shift shock or slippage / Engine runaway
A. Probable causes: A, B, D, G, N, J, M, L, 2, 6

Q. Vehicle braked when shifted from 1 to 2
A. Probable causes: N, J, 2, 4, 8

Q. Vehicle braked when shifted from 1 to 2
A. Probable causes: N, L, J, 3

Q. Does not shift from 3 to 2
A. Probable causes: D, N, J, K, M, L, 2, 3, 6

Q. Does not shift from 2 to 1 or 3 to 1
A. Probable causes: D, N, J, K, M, L, 3, 8

Q. Shift shock once accelerator is released and vehicle is decelerating
A. Probable causes: B, D, E, G, J, K, 2

Q. Excessively high 3-2, 2-1 shift points
A. Probable causes: B, D, E, G, J, K, 2

Q. Does not kickdown in 3 within kickdown limit
A. Probable causes: E, D, N, J, K, 3, 6

Q. Abnormal rise of engine speed and/or kickdown in 3 outside kickdown limit
A. Probable causes: B, D, G, N, J, K, M, 2, 6

Q. Engine runaway or slippage from 3 to 2
A. Probable causes: D, G, N, J, M, L, 2, 3, 6

Q. Does not shift from 3-2, with "D" to "2" range shift
A. Probable causes: B, G, N, J, L, 3, 6

Q. Shifts from 2-1 or 2-3 in "2" range
A. Probable causes: B, G, J

Q. No shift shock / Engine runaway in "1" to "2" range shift
A. Probable causes: A, B, D, F, N, J, M, H, 3, 5

Q. No 3-2 shift in "3" to "2" range shift
A. Probable causes: B, G, N, J, K, M, L, 2, 3, 6

Q. No engine braking in "1" range
A. Probable causes: B, G, N, J, M, 4, 6

Q. Shifts from 1-2 or 2-3 in "1" range
A. Probable causes: B, J, 6

Q. Does not shift from 2-1 in "1" range
A. Probable causes: A, B, N, J, K, L, M, 4, 6

Q. Excessively large 2-1 shift shock in "1" range
A. Probable causes: D, H, N, J, 4

Q. vehicle moves in "P" and/or parking gear not disengaged when "P" range is disengaged
A. Probable causes: B, 9

Q. Transmission overheats
A. Probable causes: A, I, G, H, N, J, M, L, 2, 3, 4, 5, 6, 7, 10

Q. Oil emission and/or white smoke while running
A. Probable causes: A, I, D, N, G, H, J, M, 2, 3, 4, 5, 6, 7, 10

Q. Abnormal odor from oil charging pipes
A. Probable causes: A, N, 1, 2, 3, 4, 5, 6, 7, 10

Q. Transmission noisy in "P" and "N" ranges
A. Probable causes: A, G, 5

Q. Transmission noisy in "D", "1", "2" and "R"
A. Probable causes: A, G, 1, 5, 8, 10