Diagnostic Aids

An intermittent may be caused by a poor connection, rubbed-through wire insulation or a wire broken inside the insulation.

Check for a poor connection or damaged ECM/TCM harness. Inspect the serial data link circuit for the following conditions:

• Improper mating
• Broken locks
• Improperly formed
• Damaged terminals
• Poor terminal-to-wiring connections
• Damaged harness