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Test N: Front Control Unit (FCU) Does Not Respond To Scan Tester

  1. Ensure ignition switch is in OFF position. Disconnect 84-pin harness connector C217. Harness connector C217 is located behind driver's side of instrument panel. See Figure .
  2. Using ohmmeter, check resistance between terminal No. 76 (Tan/Orange wire) on male side of harness connector C217 and terminal No. 2 (Tan/Orange wire) on Data Link Connector (DLC). See Figure and Figure .
  3. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Tan/Orange wire between DLC and harness connector C217. Repeat TEST A  .
  4. Using ohmmeter, check resistance between terminal No. 77 (Pink/Light Blue wire) on male side of harness connector C217 and terminal No. 10 (Pink/Light Blue wire) on DLC. See Figure and Figure .
  5. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Pink/Light Blue wire between DLC and harness connector C217. Repeat TEST A  .
  6. Disconnect Black 16-pin connector C224 from Front Control Unit (FCU). The FCU is located behind center of instrument panel on the radio. See Figure .
  7. Using ohmmeter, check resistance between terminal No. 8 (Tan/Orange wire) on connector C224 and terminal No. 76 (Tan/Orange wire) on male side of harness connector C217. See Figure and Fig 1 .
  8. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Tan/Orange wire between harness connector C217 and connector C224. Repeat TEST A  .
  9. Using ohmmeter, check resistance between terminal No. 16 (Pink/Light Blue wire) on connector C224 and terminal No. 77 (Pink/Light Blue wire) on male side of harness connector C217. See Figure and Fig 1 .
  10. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Pink/Light Blue wire between harness connector C217 and connector C224. Repeat TEST A  .
  11. Inspect pins and wire connections on harness connector C217 and connector C224. If pins and wire connections are okay, replace FCU. Repeat TEST A  . If pins or wire connections are defective or damaged, repair pins or wire connections as necessary. Repeat TEST A  .
Fig 1: Identifying Connector C224 Terminals
G96I29478Courtesy of FORD MOTOR CO.
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