Control Module & Stator Test
- Perform step 1) of COIL PRIMARY CIRCUIT TEST. If modified plug sparked, but engine would not run, substitute any known good distributor. Ground distributor, but do not install. Spin gear and check for sparks. See Fig 1.
- If sparks occur, reconnect original distributor to check if it is damaged. Repeat tests and check for sparks. If no sparks occur, replace distributor stator assembly.
- If no sparks occurred when gear of good distributor was spun, disconnect 3-wire distributor connector and 4-wire control module connector. Check harness wires as indicated in steps 4)
through 8).
- Turn ignition off. Connect ohmmeter leads to ends of each wire, one at a time. Wire mating with control module Black wire (terminal No. 8) grounds distributor. Wires mating with control module Orange and Purple wire signal control module as to when coil primary circuit should be shut off and on. Continuity should exist at each wire.
- Connect ohmmeter leads to harness wires mating with Orange wire (terminal No. 3) and Purple (terminal No. 7) wire of control module. There should be no continuity between these 2 wires.
- Connect one ohmmeter lead to ground and touch other lead in turn to wires mating Orange wire (terminal No. 3) and Purple (terminal No. 7) control module wires. An open condition should exist.
- If harness checks okay, reconnect distributor connector. Substitute a known good module and repeat system tests. If sparks occur, reconnect original control module and retest. If no sparks occur, replace original control module with a new one.
- If harness proved defective in step 4) through step 6), repair wires or connectors as necessary and retest for spark at modified plug.
Courtesy of FORD MOTOR CO.