Allison

Main code 57 indicates failure of the range verification C3 pressure switch test. Range verification C3 pressure switch while in 4th. The test occurs when a range is commanded that does not use the C3 clutch (neutral, 1, 2, 4, and 6). The code is set if the C3 pressure switch is closed when it should be open. If C3 clutch comes on when not needed, three clutches are applied and a transmission tie-up occurs. The ECU will command a range which does not use the C3 clutch and activate the DO NOT SHIFT response.

Main code 57 indicates failure of the range verification C3 pressure switch test. Range verification C3 pressure switch while in 6th. The test occurs when a range is commanded that does not use the C3 clutch (neutral, 1, 2, 4, and 6). The code is set if the C3 pressure switch is closed when it should be open. If C3 clutch comes on when not needed, three clutches are applied and a transmission tie-up occurs. The ECU will command a range which does not use the C3 clutch and activate the DO NOT SHIFT response.

Main code 57 indicates failure of the range verification C3 pressure switch test. Range verification C3 pressure switch while in N1. The test occurs when a range is commanded that does not use the C3 clutch (neutral, 1, 2, 4, and 6). The code is set if the C3 pressure switch is closed when it should be open. If C3 clutch comes on when not needed, three clutches are applied and a transmission tie-up occurs. The ECU will command a range which does not use the C3 clutch and activate the DO NOT SHIFT response.

Main code 57 indicates failure of the range verification C3 pressure switch test. Range verification C3 pressure switch while in N2/N4. The test occurs when a range is commanded that does not use the C3 clutch (neutral, 1, 2, 4, and 6). The code is set if the C3 pressure switch is closed when it should be open. If C3 clutch comes on when not needed, three clutches are applied and a transmission tie-up occurs. The ECU will command a range which does not use the C3 clutch and activate the DO NOT SHIFT response.

Main code 61 indicates the ECU has detected a hot fluid condition in the output retarder.

Possible causes (but not all causes) for hot fluid are:
1. Prolonged retarder use.
2. Low fluid level.
3. High fluid level.
4. A retarder apply system that allows the throttle and retarder to be applied simultaneously.
5. Cooler inadequately sized for retarder.

Main code 62 indicates the retarder temperature sensor or circuitry is providing a signal outside the usable range of the ECU. Retarder temperature sensor failed low (?45?C; ?49?F)

Main code 62 can be the result of a hardware failure or an actual extremely high or low temperature condition.

Main code 62 indicates the retarder temperature sensor or circuitry is providing a signal outside the usable range of the ECU. Retarder temperature sensor failed high (178?C; 352?F)

Main code 62 can be the result of a hardware failure or an actual extremely high or low temperature condition.

NOTE: A combination of codes 62 23, 33 23, and 21 23 indicates a problem with one of the branches of the common ground wire (wire 135) between the throttle and temperature sensors.

Code 63 00 is set when one of the two inputs for an input function Auxiliary Function Range Inhibit (Special) is in a different state (on or off) from the other input for longer than two minutes. When this condition is detected, Code 63 00 is set, the Service Indicator output is turned on. The transmission will not be inhibited in shifting from neutral to range.

If Code 63 00 is set and the ECU was programmed after 9/26/94, the SERVICE icon on the shift selector will be illuminated.

Subcode 26 is set when this function (Kickdown) is selected by calibration, the calibration designated input is active but not failed, and throttle position is less than the calibration value defined. The kickdown shift schedule is inhibited when subcode 26 is active. The service indicator will be turned on if it is selected by the calibration. The kickdown shift schedule is not inhibited, the code is cleared and the service indicator will be turned off if the kickdown input remains inactive for the calibration time period while throttle position is less than the calibration value.