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Page Title:
CODE 54 XX -- ONCOMING SPEED TEST (AFTER SHIFT) |
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 WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
CODE 54 XX -- ONCOMING SPEED TEST (AFTER SHIFT)
Main code 54 indicates a failed oncoming ratio test. The ratio test after a shift is failed when the ECU has
commanded the end of a shift and has not seen the transmission shift into the target range (comparing turbine and
output speeds). Erratic readings from speed sensors are a likely cause of an oncoming ratio test failure. If conditions
for a shift still exist, the shift will be retried one more time. If the ratio test is still not met, a code is logged and the
DO NOT SHIFT response is commanded. If the code is set during a direction change, Neutral with No Clutches is
commanded, otherwise the transmission is commanded to the previous range. Code 54 12 can also be caused by the
ECU being calibrated for a close ratio transmission and installed with a wide ratio transmission, or vice versa.
Additional codes could be logged for other shifts where "X" indicates the range from and "Y" indicates the range to.
NOTE:
This test is not performed below a calibrated transmission output speed of 200 rpm.
Main Code Subcode
Meaning
54
01
L1 upshift
54
07
LR shift
54
10
1L downshift
54
12
12 upshift -- incorrect calibration, wide ratio vs. close ratio
54
17
1R shift
54
21
21 downshift
54
23
23 upshift
54
24
24 upshift
54
27
2R shift
54
32
32 downshift
54
34
34 upshift
54
35
35 upshift
54
42
42 downshift
54
43
43 downshift
54
45
45 upshift
54
46
46 downshift
54
53
53 downshift
54
54
54 downshift
54
56
56 upshift
54
64
64 downshift
54
65
65 downshift
54
70
RL shift
54
71
R1 shift
54
72
R2 shift
54
80
N1L shift
54
81
N11 shift
54
82
N12 shift
54
83
N13 shift
54
85
N15 shift
54
86
N16 shift
54
92
N22 shift
54
93
N33 shift
54
95
N35 shift
54
96
N46 shift
54
XY
X to Y shift
0021 00103
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