Porsche 928 Workshop Manual page 807

38
Automatic Transmission / Gears, Valve nody
928
Condition:
Parking lock does not engage
Correction:
Check adjustment of selector lever cable. correcting if necessary.
Condition: Selector lever cannot be engaged in "H" and *P
a) With engine running
b) With engine stopped
Correction:
1. a) Disassemble, clean and service centrifugal governor.
2. b) Service blocking piston in rear transmission case.
Condition: Engine cannot be started with selector lever in
"P" or "N"
Correction:
1. Adjust selector lever cable and starter interlock switch.
2. Replace starter interlock and backup light switch.
Condition: Invisible oil loss (leak cannot be seen on outside)
Diaphragm in vacuum box defective. ATF drawn in by engine
via vacuum line.
Correction:
Replace vacuum box
Condition:
Sudden thick smoke caused by defective
vacuum box
Correction:
Replace vacuum box
38 _ 18
Troubleshooting
Printed in Germany