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Page Title:
CODE 61 XX -- RETARDER OIL TEMPERATURE HOT |
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 WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
CODE 61 XX -- RETARDER OIL TEMPERATURE HOT
TEMPERATURE VS. RESISTANCE
TEMP F
OHMS
TEMP C
2900
-58
525
-50
-40
577
-40
7.0C
2700
-22
632
-30
-4
691
-20
14
754
-10
2500
32
820
0
889
50
10
2300
5.0C
962
68
20
1039
86
30
1118
104
40
2100
1202
122
50
1288
140
60
4.0C
1900
1379
158
70
1472
176
80
1700
1569
194
90
3.0C
1670
212
100
1774
230
110
1500
1882
248
120
2.0C
1993
266
130
1300
2107
284
140
2225
150
302
1100
2628
183
361
1.6C
900
LOW PT
700
3.0C
SUMP TEMPERATURE IN F
500
4
32
68
104
140
176
212
248
284
320
356
Main code 61 indicates the ECU has detected a hot fluid condition in the output retarder. Table 57 shows what
actions are taken by the ECU at elevated retarder temperatures.
Possible causes (but not all causes) for hot fluid are:
1. Prolonged retarder use.
2. TID 2 transmission with ECU prior to Version 8A.
3. Low fluid level.
4. High fluid level.
5. A retarder apply system that allows the throttle and retarder to be applied simultaneously.
6. Cooler inadequately sized for retarder.
If the validity of the hot fluid diagnosis is in question, temperature can be checked by using a temperature gauge at the
retarder-out port or by reading retarder temperature with the Pro-Link diagnostic tool. Another method of checking
retarder temperature is to remove the "T" connector at the ECU and measure resistance (Ohms) between terminals T28
and T25. Compare the resistance value to the value in Figure 621 to see if the result is within the expected operating
range.
Use the Pro-Link diagnostic tool to determine the software version being used.
NOTE:
The retarder temperature sensor is located externally on the HD retarder housing and under the plate on the MD
retarder housing. When retarder temperature reaches a preset level, a retarder hot temperature light is illuminated.
NOTE:
When an ECU with a version 8 calibration is used with a TransID 2 transmission, 62 XX codes are set
because the ECU does not have the proper calibrations for the TID 2 thermistors. The ECU calibration
must be updated to version 8A.
0021 00110
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