DTC 72

Fig. 101 Code 72: Brake Switch Open Or Shorted (1 Of 4):

Fig. 101 Code 72: Brake Switch Open Or Shorted (2 Of 4):

Fig. 101 Code 72: Brake Switch Open Or Shorted (part 3 0f 4):

Fig. 101 Code 72: Brake Switch Open Or Shorted (part 4 Of 4)):

DTC 72 Brake Switch Open Or Shorted:

CIRCUIT OPERATION
The electronic brake control module EBCM/EBTCM monitors brake pedal position using the brake travel switch. The switch is normally closed. It opens when the brake pedal is depressed approximately 40% down. During most ABS braking conditions the EBCM/EBTCM turns on the pump motor, replenishing the PMV assembly reservoir and applying fluid pressure to the master cylinder. This causes the brake pedal to gradually rise. The EBCM/EBTCM turns off the pump motor when brake pedal height sufficiently rises to close the brake travel switch.

FAILURE CONDITIONS
DTC 72 sets when the EBCM/EBTCM detects the brake travel switch CKT 848 is shorted to ground (with the brake pedal depressed) or open.