Test A: No Communication With Front Electronic Module
- Turn ignition switch to LOCK position. Remove and inspect fuses No. 2 (10-amp) and No. 14 (10-amp) from battery junction box, located on left side of engine compartment. If either or both fuse(s) are blown, inspect circuit(s) for short to ground, and repair as necessary. If circuit(s) is okay, replace fuse(s). If fuses are okay, turn ignition switch to RUN position. Measure voltage between ground and battery junction box fuses No. 2 and No. 14 input side. If all voltages are 10 volts or more, install fuses and go to next step. If any voltage is less than 10 volts, repair battery junction box power supply circuit(s). See POWER DISTRIBUTION article in WIRING DIAGRAMS. Clear DTCs and repeat Front Electronic Module (FEM) self-test.
- Turn ignition switch to LOCK position. Disconnect FEM harness connectors C190 and C346. See Figure . Measure voltage between ground and FEM harness connector C346 terminal No. 1 (Light Blue/Red wire). See Figure . Measure voltage between ground and FEM harness connector C190 terminal No. 6 (Red wire). See Figure . If all voltages are less than 10 volts, repair open in Light Blue wire or Red wire. If any voltage is 10 volts or more, go to next step.
- Disconnect FEM harness connector C192. Measure resistance between ground and FEM harness connector C190 terminal No. 12 (Black wire). Measure resistance between ground and FEM harness connector C192 terminals No. 11, 13, 14 and 15 (all Black wires). See Figure . If all resistances are less than 5 ohms, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - WINDSTAR article. If any resistance is 5 ohms or more, repair open in Black wire(s). Clear DTCs and repeat FEM self-test.