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Bus Short To Ground

CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector or battery.
  1. Turn ignition switch to OFF position. Disconnect scan tool from DLC. Using DVOM, measure resistance between ground and DLC connector terminal No. 5 (Black/Tan wire). If reading is less than 5 ohms, go to next step. If readings is 5 ohms or more, repair open in Black/Tan wire. Perform BODY VERIFICATION TEST  .
  2. For models with manual transmission, go to next step. On models with automatic transmission, turn ignition switch to OFF position. Disconnect Transmission Control Module (TCM). Turn ignition switch to ON position. If scan tool displays same CCD bus failure message, go to next step. If CCD bus failure message changes, check all connectors for good terminal contact. Repair connectors as necessary. If connectors are okay, replace TCM. See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
  3. Turn ignition switch to OFF position. Disconnect Powertrain Control Module (PCM). Turn ignition switch to ON position. If scan tool displays same CCD bus failure message, go to next step. If CCD bus failure message changes, check all connectors for good terminal contact. Repair connectors as necessary. If connectors are okay, replace PCM. See POWERTRAIN CONTROL MODULE (PCM) VERIFICATION TEST  .
  4. Turn ignition switch to OFF position. Disconnect Controller Anti-lock Brake (CAB) module. Turn ignition switch to ON position. If scan tool displays same CCD bus failure message, go to next step. If CCD bus failure message changes, check all connectors for good terminal contact. Repair connectors as necessary. If connectors are okay, replace CAB module. Perform CONTROLLER ANTI-LOCK BRAKE (CAB) VERIFICATION TEST  .
  5. On models not equipped with Compass Mini Trip Computer (CMTC), go to next step. Turn ignition switch to OFF position. Disconnect CMTC connector. Turn ignition switch to ON position. If scan tool displays same CCD bus failure message, go to next step. If CCD bus failure message changes, check all connectors for good terminal contact. Repair connectors as necessary. If connectors are okay, replace CMTC. Perform BODY VERIFICATION TEST  .
  6. Turn ignition switch to OFF position. Disconnect radio 2-pin connector. Turn ignition switch to ON position. If scan tool displays same CCD bus failure message, go to next step. If CCD bus failure message changes, check all radio connectors and terminals for good terminal contact. Repair connectors as necessary. If connectors are okay, replace radio. Perform BODY VERIFICATION TEST  .
  7. Turn ignition switch to OFF position. Disconnect Central Timer Module (CTM) connector(s). Turn ignition switch to ON position. If scan tool displays same CCD bus failure message, go to next step. If CCD bus failure message changes, check all connectors for good terminal contact. Repair connectors as necessary. If connectors are okay, replace CTM. Perform BODY VERIFICATION TEST  .
  8. Turn ignition switch to OFF position. Remove Mechanical Instrument Cluster (MIC) from dash. Turn ignition switch to ON position. If scan tool displays same CCD bus failure message, go to next step. If CCD bus failure message changes, check all connectors for good terminal contact. Repair connectors as necessary. If connectors are okay, replace MIC. Perform BODY VERIFICATION TEST  .
  9. Turn ignition switch to OFF position. Disconnect negative battery cable. Wait 2 minutes. Disconnect Air Bag Control Module (ACM). Connect negative battery cable. Turn ignition switch to ON position. If scan tool displays same CCD bus failure message, go to next step. If CCD bus failure message changes, check all connectors for good terminal contact. Repair connectors as necessary. If connectors are okay, replace ACM. Perform AIR BAG VERIFICATION TEST  .
  10. Ensure interior lighting if off. Measure resistance between ground and MIC connector C1 terminals No. 10 (Violet/Brown wire) and terminal No. 9 (White/Black wire). If either resistance reading is less than 700 ohms, repair short to ground in Violet/Brown wire or White/Black wire. Perform BODY VERIFICATION TEST  . If both resistance readings are 700 ohms or more, go to next step.
  11. Turn ignition switch to OFF position. Disconnect negative battery cable. Connect all previously disconnected connectors and inspect connectors for good terminal contact. Repair connectors as necessary. Connect negative battery cable. Turn ignition switch to ON position. If CCD bus failure message changes, fault is not present at this time. If scan tool displays same CCD bus failure message, and connectors are okay, repair or replace scan tool or scan tool cable(s) as necessary. Perform BODY VERIFICATION TEST  .
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