Regal V6-3100 3.1L VIN M SFI (1996)
Serial Data: Initial Inspection and Diagnostic Overview
PCM DATA LINE
1. If all components are not accessible with a scan tool, check for an open in CKT 800 between Data Link Connector (DLC) terminal "9" and S237.
2. If a single component is not accessible with a scan tool, check for an open in CKT 800 between S237 and the component. Check the Class 2 Serial
Data Line between the Data Link Connector terminal "2" and the Powertrain Control Module (PCM). Also check C100 for a poor connection. If
the wires are OK, refer to Antilock Brake System for ABS diagnosis and to Air Bags (Supplemental Restraint Systems) for Supplemental Air
Restraint diagnosis.
See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems
See: Restraint Systems/Air Bag Systems
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Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a
continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be
checked by monitoring for a voltage drop with the system operational (under load).
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Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (refer to General
Troubleshooting Procedures). See: Diagrams/Diagnostic Aids
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Refer to System Diagnosis. See: Component Tests and General Diagnostics/System Diagnosis
