Silverado 3500 4WD V8-8.1L VIN G (2006)
Power Take-Off: Testing and Inspection
Engine RPM Does Not Increase With Power Take-Off Engaged
ENGINE RPM DOES NOT INCREASE WITH POWER TAKE-OFF ENGAGED
CIRCUIT DESCRIPTION
When the power take-off (PTO) switch is turned to the ON position and all PTO engage conditions are met, the engine RPM should increase to the
standby speed. When the powertrain control module (PCM) receives the signal from the PTO switch the PCM will send a signal to the throttle actuator
control module (TAC). The TAC module controls the TAC motor which changes the position of the throttle. Communications between the two
modules is monitored and checked for accuracy by the PCM. DTCs may be recorded in the event of the failure. The 6.6L diesel engine does not have
a TAC system and the engine RPM is strictly controlled by the engine control module (ECM) and the Fuel Injection Control Module.
TEST DESCRIPTION
