A/T - Cycling or No TCC, Shift Hunting
Date: 1996Technical Bulletin # 220B
Transmission:
E4OD
Subject:
No TCC, TCC cycling, shift hunting
Application:
Ford Trucks (Diesel)
Revised - Replace bulletin 22OA with this bulletin number 22OB
E4OD
(Diesel Engine Only)
No TCC, TCC Cycling, Shift Hunting
All of these problems can be caused by a short or open of the RPM sensor. The sensor can be checked with a DMM. Set the DMM to measure frequency (Hz). The frequency should rise with engine RPM In this particular case, the frequency will be equal to engine RPM.
Example: Idle in Drive = 550-600 Hz.
Stall in Drive = 1600 - 1700 Hz.
If sensor is faulty, replace it with part number E5TZ-17B384-A.
NOTE:
It is best to use a break-out box for this rather than piercing the wires.