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DTC P1502: Invalid Test - Auxiliary Power Control Functioning

DTC P1502: INVALID TEST - AUXILIARY POWER CONTROL FUNCTIONING

Description:  The power take-off (PTO) system provides an input signal to the powertrain control module (PCM) indicating there is an additional load being applied to the engine. The PCM disables the on-board diagnostic (OBD) monitors and increases the engine RPM based on the PTO system or auxiliary idle control input.
The following entry conditions are required to enable the PTO or auxiliary idle control:
  • accelerator pedal released
  • automatic transmission is in the PARK position
  • brake pedal released
  • engine at normal operating temperature
  • parking brake applied
Possible Causes: 
  • PTO or auxiliary idle control active during self-test
  • Short to voltage in PTO input circuit
Diagnostic Aids:  Verify that the accelerator pedal is released, the automatic transmission is in the PARK position, the brake pedal is released, the engine is at normal operating temperature and the parking brake has been applied.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST AN .
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