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Pcm Data Line

  1. If all components (except Anti-Theft Module) cannot be accessed with a scan tool, check the 800 circuit wire for an open or short between the Data Link Connector (DLC) terminal No. 9 and splice S237. See Figure and WIRING DIAGRAMS  .
  2. If a single component cannot be accessed with a scan tool, check the Tan 800 circuit wire for an open between the component and splice S237. See WIRING DIAGRAMS  .
  3. Check the Purple 1807 circuit wire for an open or short between the PCM and DLC terminal No. 2. Check C100 for a faulty connection. See Figure and WIRING DIAGRAMS  .
  4. If wires are okay, perform diagnostic system check for module that does not communicate. See OBD SYSTEM CHECK in appropriate BASIC TESTING article in ENGINE PERFORMANCE, or DIAGNOSTIC CIRCUIT CHECK in ANTI-LOCK BRAKE SYSTEM article in BRAKES or SIR DIAGNOSTIC SYSTEM CHECK in AIR BAG RESTRAINT SYSTEM article in RESTRAINTS.
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