No engine braking
Probable cause(s)
Shift cable broken, binding, or out of adjustment
Connection between shift cable and transmission or shift lever is worn
Output shaft (countershaft) speed sensor defective
Notes
Check for a loose shift cable at the shift lever and the selector control lever.
Check the output shaft (countershaft) speed sensor installation.
Inspect the output shaft (countershaft) speed sensor O-ring for wear and damage.