April 2001 Issue
Issue Summary:
When a vehicle equipped with the THM 4L60-E will not start in Neutral, the cause may be the Park/Neutral switch or the C1 or C2 repair harness.
Trouble code P1870 in THM 4L60-E units usually results from slippage of the torque-converter clutch. Proper procedures for assembly of the front pump on the Ford 5R55N are important, because some misassemblies can occur if the technician does not refer to the manual.
For example, the outer pump gear must be placed in the pump body with the ID marks facing down.