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Home >> Chevrolet >> 2003 >> Impala LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls - System & Component Testing - 3.4L) >> Computerized Engine Controls >> Powertrain Control Module >> Notes
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Powertrain Control Module: Notes

WARNING: This page is about a different variant/trim than selected.
CAUTION: To prevent damage caused by the improper probing of connector terminals, use the Connector Test Adapter Kit (J 35616-A) for any test that requires probing the following items:
  • The PCM harness connectors.
  • The electrical center fuse/relay cavities.
  • The component terminals.
  • The component harness connector.
NOTE: To identify circuits, see WIRING DIAGRAMS .

Poor power or ground connections can cause widely varying symptoms. For additional diagnostic and repair procedures, see INTERMITTENTS in TROUBLE SHOOTING - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.

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