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Test E: Powertrain Control Module (Pcm) Does Not Respond To NGS Tester

NOTE: If test results indicate PCM is faulty, always check for any engine performance related DTC prior to replacing PCM. If any DTCs are present, service DTCs as necessary and retest. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  1. Turn ignition switch to LOCK position. Disconnect PCM harness connector C175a, located in right rear corner of engine compartment. Disconnect NGS tester (if connected). Inspect PCM harness connector for loose, damaged or corroded terminals. If problem exists, repair harness connector as necessary and retest system for normal operation. If problem does not exist, go to next step.
  2. Connect PCM harness connector and connect NGS tester. Turn ignition switch to RUN position. Perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. If NGS tester indicates PCM: NO RESPONSE ON CKT 914 (BUS +), go to next step. If NGS tester indicates PCM: NO RESPONSE ON CKT 915 (BUS -), go to step  9 .
  3. Turn ignition switch to LOCK position. Disconnect PCM harness connector C175a. Disconnect NGS tester. Measure resistance between terminal No. 3 (Gray wire) at PCM harness connector C175a and terminal No. 2 (Gray/Red wire) at Data Link Connector (DLC). See Figure and Fig 1 . If resistance is greater than 5 ohms, go to next step. If resistance is 5 ohms or less, replace PCM and retest system for normal operation.
  4. Disconnect Auxiliary Junction Box (AJB) harness connector C283c, located behind left side of instrument panel. See Figure . Inspect harness connector for loose, damaged or corroded terminals. If problem does not exist, go to next step. If problem exists, repair harness connector as necessary and retest system for normal operation.
  5. Measure resistance in Gray wire between terminal No. 4 at AJB harness connector C283c and terminal No. 3 at PCM harness connector C201c. See Figure and Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Gray wire between AJB and PCM. Retest system for normal operation.
  6. Disconnect AJB harness connector C283d, located behind left side of instrument panel. See Figure . Measure resistance between terminal No. 4 at AJB connector C283c and terminal No. 16 at AJB connector C283d (component side). See Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace AJB and retest system for normal operation.
  7. Disconnect joint connector No. 4 harness connector C223, located behind left side of instrument panel. Measure resistance in Gray wire between terminal No. 12 at joint connector No. 4 harness connector C223 and terminal No. 16 at AJB harness connector C283d. See Figure and Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Gray wire between AJB and joint connector No. 4. Retest system for normal operation.
  8. Measure resistance between terminals No. 12 and 14 at joint connector No. 4 (component side). See Figure . If resistance is 5 ohms or less, repair open in Gray/Red wire between joint connector No. 4 and DLC. Retest system for normal operation. If resistance is greater than 5 ohms, replace joint connector No. 4 and retest system for normal operation.
  9. Turn ignition switch to LOCK position. Disconnect PCM harness connector C175a. Disconnect NGS tester. Measure resistance between terminal No. 4 (Blue wire) at PCM harness connector C175a and terminal No. 10 (Blue/Red wire) at Data Link Connector (DLC). See Figure and Fig 1 . If resistance is greater than 5 ohms, go to next step. If resistance is 5 ohms or less, replace PCM and retest system for normal operation.
  10. Disconnect Auxiliary Junction Box (AJB) harness connector C283c, located behind left side of instrument panel. See Figure . Inspect harness connector for loose, damaged or corroded terminals. If problem does not exist, go to next step. If problem exists, repair harness connector as necessary and retest system for normal operation.
  11. Measure resistance in Blue wire between terminal No. 1 at AJB harness connector C283c and terminal No. 4 at PCM harness connector C175a. See Figure and Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Blue wire between AJB and PCM. Retest system for normal operation.
  12. Disconnect AJB harness connector C283d, located behind left side of instrument panel. See Figure . Measure resistance between terminal No. 1 at AJB connector C283c and terminal No. 12 at AJB connector C283d (component side). See Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace AJB and retest system for normal operation.
  13. Disconnect joint connector No. 4 harness connector C223, located behind left side of instrument panel. Measure resistance in Blue wire between terminal No. 11 at joint connector No. 4 harness connector C223 and terminal No. 12 at AJB harness connector C283d. See Figure and Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Blue wire between AJB and joint connector No. 4. Retest system for normal operation.
  14. Measure resistance between terminals No. 9 and 11 at joint connector No. 4 (component side). See Figure . If resistance is 5 ohms or less, repair open in Blue/Red wire between joint connector No. 4 and DLC. Retest system for normal operation. If resistance is greater than 5 ohms, replace joint connector No. 4 and retest system for normal operation.
Fig 1: Identifying Powertrain Control Module Harness Connector Terminals
G00011081Courtesy of FORD MOTOR CO.
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