TM 10-3930-669-20 22.  TRANSMISSION DOES NOT OPERATE IN FORWARD OR REVERSE (CONT). KNOWN INFO All 24 Vdc circuits operate. Fuse 3 OK. HIGH Range Indicator operates. Wire 10 OK. Interlock switch OK. Wire 10A OK. POSSIBLE PROBLEMS Master cylinder pressure switch faulty. Wire 10B faulty. Diode module DM1 faulty. KNOWN INFO All 24 Vdc circuits operate. Fuse 3 OK. HIGH Range Indicator operates. Wire 10 OK. Interlock switch OK. Wire 10A OK. Master cylinder pressure POSSIBLE PROBLEMS Wire 10B faulty. Diode module DM1 faulty. TEST OPTIONS Continuity test. STE/ICE-R #91. REASON FOR QUESTION If continuity is not present master cylinder pressure switch is faulty. TEST OPTIONS Voltage test. STE/ICE-R #89. REASON FOR QUESTION If 22 to 24 Vdc are not present, wire  10B  is  faulty.  If  wire  10B is     OK     diode     module     DM1 faulty. ¬ ¬ 2-258