Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Ford Excursion 2WD V10-6.8LFACTORY OEM SERVICE PROCEDURE
Output Test Mode
Description
The Output Test Mode (OTM) aids in servicing output actuators associated with the Powertrain Control Module (PCM). This mode allows the technician to energize and de-energize most of the system output actuators on command. When entering OTM, the outputs can be turned off and on without activating the fan control. The low and high speed fan control(s) may be turned on separately without energizing the other outputs. This function is supported by each vehicle strategy and may not be available on all scan tools.
As a safety precaution, Output Test Mode will default to the off state after 10 minutes and fuel pump off after approximately 7-10 seconds. OTM will also turn off after the vehicle is started or after cycling the key off then on.
WARNING: SAFETY MUST BE OBSERVED WHEN USING OUTPUT TEST MODE:
- WHEN ALL OUTPUTS ARE ON, THE ELECTRIC FUEL PUMP IS BRIEFLY ENERGIZED, SO MAKE SURE FUEL SYSTEM IS INTACT AND IS NOT BEING SERVICED AT THIS TIME.
- WHEN LOW SPEED OR HIGH SPEED FAN CONTROL(S) ARE TURNED ON, MAKE SURE FAN BLADES ARE CLEAR OF ANY OBSTRUCTION.
The Output Test Mode (OTM) aids in servicing output actuators associated with the Powertrain Control Module (PCM). This mode allows the technician to energize and de-energize most of the system output actuators on command. When entering OTM, the outputs can be turned off and on without activating the fan control. The low and high speed fan control(s) may be turned on separately without energizing the other outputs. This function is supported by each vehicle strategy and may not be available on all scan tools.
As a safety precaution, Output Test Mode will default to the off state after 10 minutes and fuel pump off after approximately 7-10 seconds. OTM will also turn off after the vehicle is started or after cycling the key off then on.
WARNING: SAFETY MUST BE OBSERVED WHEN USING OUTPUT TEST MODE:
- WHEN ALL OUTPUTS ARE ON, THE ELECTRIC FUEL PUMP IS BRIEFLY ENERGIZED, SO MAKE SURE FUEL SYSTEM IS INTACT AND IS NOT BEING SERVICED AT THIS TIME.
- WHEN LOW SPEED OR HIGH SPEED FAN CONTROL(S) ARE TURNED ON, MAKE SURE FAN BLADES ARE CLEAR OF ANY OBSTRUCTION.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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