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Test D: Powertrain Control Module (Pcm) Does Not Respond To Scan Tester

WARNING: This page is about a different car, the 1997 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.
  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 40-pin harness connector C150. Harness connector C150 is located at driver's side rear corner of engine compartment. See Figure .
  7. Using ohmmeter, check resistance between terminal No. 11 (Tan/Orange wire) on female side of harness connector C150 and terminal No. 76 (Tan/Orange wire) on female 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 connectors C217 and C150. Repeat TEST A  .
  9. Using ohmmeter, check resistance between terminal No. 15 (Pink/Light Blue wire) on female side of harness connector C150 and terminal No. 77 (Pink/Light Blue wire) on female 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 connectors C217 and C150. Repeat TEST A  .
    Fig 1: Identifying Harness Connector C139 & C150 Terminals
    G97I28769Courtesy of FORD MOTOR CO.
  11. Disconnect Black 16-pin harness connector C127. Harness connector C127 is located in engine compartment, near brake booster. See Figure .
  12. Using ohmmeter, check resistance between terminal No. 2 (Tan/Orange wire) on male side of harness connector C127 and terminal No. 11 (Tan/Orange wire) on male side of harness connector C150. See Fig 1 and Fig 2 .
  13. 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 connectors C127 and C150. Repeat TEST A  .
  14. Using ohmmeter, check resistance between terminal No. 3 (Pink/Light Blue wire) on male side of harness connector C127 and terminal No. 15 (Pink/Light Blue wire) on male side of harness connector C150. See Fig 1 and Fig 2 .
  15. 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 connectors C127 and C150. Repeat TEST A  .
    Fig 2: Identifying Harness Connector C127 Terminals
    G97B28770Courtesy of FORD MOTOR CO.
  16. Disconnect Gray 104-pin connector C1032 from Powertrain Control Module (PCM). The PCM is located in passenger's side of engine compartment, on the firewall. See Figure .
  17. Using ohmmeter, check resistance between terminal No. 2 (Tan/Orange wire) on female side of harness connector C127 and terminal No. 16 (Tan/Orange wire) on connector C1032 for PCM. See Fig 2 and Fig 3 .
  18. 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 C127 and connector C1032. Repeat TEST A  .
  19. Using ohmmeter, check resistance between terminal No. 3 (Pink/Light Blue wire) on female side of harness connector C127 and terminal No. 15 (Pink/Light Blue wire) on connector C1032 for PCM. See Fig 2 and Fig 3 .
  20. 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 C127 and connector C1032. Repeat TEST A  .
  21. Inspect pins and wire connections on harness connectors C127, C150 and connector C1032 for PCM. If pins and wire connections are okay, replace PCM. Repeat TEST A  . If pins or wire connections are defective or damaged, repair pins or wire connections as necessary. Repeat TEST A  .
Fig 3: Identifying Connector C1032 Terminals
G97C28771Courtesy of FORD MOTOR CO.
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