Test A: No Communication With Generic Electronic Module
- Turn ignition switch to LOCK position. Disconnect Generic Electronic Module (GEM) 22-pin harness connector C201a. GEM is located behind center of instrument panel. Turn ignition switch to RUN position. Measure voltage between ground and GEM harness connector C201a terminal No. 12 (Orange/Light Green wire). See Fig 1
. Measure voltage between ground and GEM harness connector C201a terminal No. 13 (Red/Yellow wire). If both voltages are 10 volts or more, go to next step. If either voltage is less than 10 volts, repair open in Orange/Light Green wire or Red/Yellow wire.
- Turn ignition switch to LOCK position. Disconnect GEM 26-pin harness connector C201b. GEM is located behind center of instrument panel. Turn ignition switch to RUN position. Measure voltage between ground and GEM harness connector C201b terminal No. 26 (Black/White wire). See Fig 2
. If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in Black/White wire.
- Turn ignition switch to LOCK position. Ensure GEM harness connector C201a is still disconnected. Turn ignition switch to RUN position. Measure voltage between ground and GEM harness connector C201a terminal No. 1 (Black/Pink wire). If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open in Black/Pink wire.
- Turn ignition switch to LOCK position. Measure resistance between ground and GEM harness connector C201b terminal No. 12 (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between GEM and ground. Ground point is located on floor below driver's seat.
- Measure resistance between ground and GEM harness connector C201a terminal No. 2 (Black/White wire). If resistance is less than 5 ohms, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - ESCAPE article. If resistance is 5 ohms or more, repair open in Black/White wire between GEM and ground. Ground point is located behind center of instrument panel, near GEM.
Courtesy of FORD MOTOR CO.
Courtesy of FORD MOTOR CO.