Note On Intermittents

If an intermittent Code 39 is being set, it could be due to the adjustment of the brake switches. The ECM does not test for the TCC code if it sees the brake applied through the cruise control brake signal on circuit 919. This is because the TCC brake switch is also open under this condition. If the TCC brake switch is adjusted such that it opens before the Cruise Control brake switch. A Code 39 could be set if the operator were to keep the brake pedal applied just enough to open the TCC switch but not the Cruise Control switch.