Sierra 1500 4WD V8-5.3L VIN B (2005)
Steps 14-19
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests for an open fog lamp fuse.
3. This step tests for open cruise fuse.
4. This step tests the battery positive circuit for battery voltage.
5. This step tests the battery positive circuit for an open.
6. This step tests the PTO relay output circuit for an open.
7. This step tests the PTO ON signal circuit for battery voltage.
8. This step tests the PTO ON signal circuit for an open.
9. This step tests the cruise control set/coast switch signal circuit for battery voltage.
10. This step tests the PTO status circuit for an open.
11. This step tests the PTO switch and PTO unit ground circuits for an open.
12. This step tests the battery positive and PTO relay output circuits for a short to ground.
13. This step tests the ignition 3 circuit for a short to ground.
14. This step tests the cruise control ON switch signal, cruise control set/coast signal, PTO status, and PTO ON signal circuits for a short to ground.
15. This step tests the control side of the PTO relay for proper operation.
Power Take-Off (PTO) Indicator Inoperative
POWER TAKE-OFF (PTO) INDICATOR INOPERATIVE
CIRCUIT DESCRIPTION
This symptom chart will aid in diagnosing a failed power take-off (PTO) indicator. This diagnostic assumes that the PTO solenoid is functional and
only the indicator is failing to come on. When the ignition switch is in RUN, voltage should be present on the Ignition 3 Voltage circuit. When the
PTO switch is turned to ON, the LED will illuminate. The indicator has its own ground circuit. The LED and PTO solenoid have different ground
circuits. Therefore, the LED may be illuminated when the PTO solenoid is disengaged.
TEST DESCRIPTION
