DTC 74

DTC 74 PMV Pressure Switch Circuit Open Or Shorted (part 1 Of 3):

DTC 74 PMV Pressure Switch Circuit Open Or Shorted (2 Of 3):

DTC 74 PMV Pressure Switch Circuit Open Or Shorted (part 3 Of 3):

PMV Pressure Switch Circuit Open Or Shorted:

CIRCUIT OPERATION
The pressure switch monitors primary brake system pressure. The normally closed switch opens when the brakes are applied and pressure exceeds 700 kPa (101 psi). If the brakes are manually applied during traction control mode, the PMV pressure switch input, along with the brake switch input, signal the EBTCM to disable traction control and allow manual braking. The pressure switch is part of the pressure modulator valve (PMV) assembly and is not serviceable.

FAILURE CONDITIONS
DTC 74 sets when the EBTCM detects an open or short to ground in the PMV pressure switch circuitry.

Possible Causes
^ Open in CKT 853 or 1659.
^ Short to ground in CKT 1659 with the brakes applied.
^ Failed PMV pressure switch.