P: C1440 (ABS Only) Pressure Transducer Signal Fault

Pinpoint Test P: DTC C1440 (ABS Only) Pressure Transducer Signal Fault

Normal Operation
The brake pressure switch provides an additional speed control deactivation if the stoplamp switch fails. When the brake pedal is pressed, 1700 kPa (246 psi) of brake fluid pressure in the brake master cylinder opens the brake pressure switch, removing B+ voltage to the speed control servo electric clutch.

Possible Causes
^ circuit 10 (LG) open
^ circuit 307 (BK/YE) open, or short to voltage
^ anti-lock brake system (ABS) module
^ brake pressure switch

Test P1:

Tests P2 - P6:

Tests P6 (continued) - P8:

Test P9:

PINPOINT TEST P: DTC C1440 (ABS ONLY) PRESSURE TRANSDUCER SIGNAL FAULT

CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.