Engine speed sensor, signal missing
â–¶ How to fix
Check the cable harness. Try fitting a new sensor and check whether the fault disappears.Contact an Allison dealer.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
There is no signal from the engine speed sensor which is located on the output shaft.
Possible cause
A possible cause of the fault may be damage to the cable harness or a defective rotation speed sensor.