Initial Inspection and Diagnostic Overview

FAULT DIAGNOSIS: ZF4HP22 Automatic Gearbox
Before referring to the fault diagnosis chart, ensure that the following static checks are carried out first:

Initial Static Checks
Check start positions P & N only
Reverse lights R only
Gear engagements N-D, N-3, N-2, N-1, N-R
Full throttle Engine switched off, check full travel at engine and at pedal.
Oil level N selected, engine running at normal running temperature.

Pressure test
2000 rpm 150 psi ±5 psi
Idle pressure at 665-735 rpm 100 psi ±5 psi