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Pinpoint Test "A"

  1. Disconnect harness connector No. 1. See Fig 3 . Inspect connector and pin No. 2 (Tan/Orange wire) for damage or corrosion. If any faults are found, repair as necessary. If no faults are found, go to next step.
  2. Disconnect harness connector No. 1. Inspect connector for damage or corrosion and repair if necessary. Measure resistance between Data Link Connector (DLC) pin No. 2 (Tan/Orange wire) and harness connector No. 1 Tan/Orange wire terminal. See Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace circuit No. 914 (Tan/Orange wire) and circuit No. 915 (Pink/Light Blue wire).
    Fig 1: Identifying DLC Terminals (Mustang)
    G96C01147Courtesy of FORD MOTOR CO.
    Fig 2: Identifying PCM Connector Terminals (Mustang)
    G96E01148Courtesy of FORD MOTOR CO.
  3. Disconnect PCM 104-pin connector. Inspect pin No. 16 and circuit (Tan/Orange wire) for damage or corrosion. See Fig 2 . Repair if necessary. If circuit is okay, go to next step.
  4. Measure resistance between PCM connector pin No. 16 and harness connector No. 1 Tan/Orange wire terminal. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, replace circuit No. 914 (Tan/Orange wire) and circuit No. 915 (Pink/Light Blue wire) between PCM connector pin No. 16 and harness connector.
  5. Disconnect harness connector No. 1. Inspect connector and pin No. 7 (Pink/Light Blue wire) for damage or corrosion. If any faults are found, repair as necessary. If no faults are found, go to next step.
  6. Measure resistance between Data Link Connector (DLC) pin No. 10 (Pink/Light Blue wire) and harness connector No. 1 Pink/Light Blue wire terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace circuit No. 914 (Tan/Orange wire) and circuit No. 915 (Pink/Light Blue wire).
  7. Disconnect PCM 104-pin connector. Inspect pin No. 15 and circuit (Pink/Light Blue wire) for damage or corrosion. Repair if necessary. If circuit is okay, go to next step.
  8. Measure resistance between PCM connector pin No. 15 and harness connector No. 1 Pink/Light Blue wire terminal. If resistance is less than 5 ohms, replace circuit No. 914 (Tan/Orange wire) and circuit No. 915 (Pink/Light Blue wire) between PCM connector and harness connector C1. If resistance is 5 ohms or more, no faults are present at this time. Reconnect all components and verify symptom/fault code are present.
Fig 3: Module Communication Network Layout (Mustang)
G96G01149Courtesy of FORD MOTOR CO.
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