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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 1881 (Engine Controls - Diagnostic Subroutines -- Diesel 6.0L (99P E-Series & 99P F450/550)) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> P1502 - Invalid Test - Auxiliary Power Control Functioning

P1502 - Invalid Test - Auxiliary Power Control Functioning

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Ford RV Cutaway, 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
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 or manual transmission in NEUTRAL with the clutch pedal released
  • 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 or manual transmission in NEUTRAL with the clutch pedal released; 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   refer to PINPOINT TEST AN .
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