Diagnostic Aids

DTC P0703 indicates that the TCM did not see the proper input signal for service brake status during an acceleration or deceleration cycle. This may indicate an open or short in the TCC brake switch/cruise control release circuit or a faulty stop lamp switch.

• Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:
  • A bent terminal
  • A backed-out terminal
  • A damaged terminal
  • Poor terminal tension
  • A chafed wire
  • A broken wire inside the insulation
• When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
• You may have to drive the vehicle in order to experience a condition.