P

Pinpoint Test P: DTC C1440 - Pressure Transducer Signal Fault

Test P1-P4:

Test P5-P8:

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

Normal Operation
The brake pressure switch provides an additional speed control deactivation if the Brake ON/OFF (BOO) switch fails. When the brake pedal is pressed, 125 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
^ ABS module.
^ Circuit 1003 (GY/YE).
^ Brake pressure switch.
^ Circuit 307 (BK/YE).