Code 90, TCC Brake Switch: Notes

Code will set if the following occur:

• Codes 33, 106, 133 and 137b are not set.
• Non drive wheel speed is 36 MPH or greater, or if non drive wheel speed is 36 MPH or greater and has not fallen below 1.6 MPH since.
• A 2.5 MPH or greater decrease in non drive wheel speed occurred in 0.2 second.
• A transition in extended travel brake switch has occurred with no change in TCC brake switch.
• All conditions have occurred 5 times.
  NOTE: Test numbers refer to numbers on diagnostic chart.

1. Checks for power to switch.
2. Checks switch.