Lincoln Navigator: Starting System - 3.5L EcoBoost (272kW/370PS) / Starter Amperage Draw Test. General Procedures

NOTE: Make sure the test is performed with the engine at 60.8 °F ( 16 °C) or above.

1. Make sure the battery is fully charged.
   For additional information, refer to: Specifications (414-01 Battery, Mounting and Cables, Specifications).

1. Disable the Fuel System. For Gasoline engines refer to:
   For additional information, refer to: Fuel System Pressure Release (310-00 Fuel System - General Information - 3.5L EcoBoost (272kW/370PS), General Procedures).
   . For Diesel engines refer to: Wiring section for fuel pump inline connector location.
   

1. Connect the 0-500-amp probe to the starter B+ Cable and to the VCMM .
   

1. Connect the VCMM and use the Oscilloscope option scaled to 100/A/Div. Add PIDS "Ambient Air Temp" and "Engine RPM".
   

1. Crank the engine, no more than 6 seconds at a time.
   

   NOTE: Allow 2 minutes between tests to allow for starter cooling to prevent overheat and damage to the motor.

1. Record the results, specifically Ambient Air Temperature (AAT), Starter Current (Current Clamp) and Cranking speed (PCM signal Engine_Speed).
   

1. Compare the results to the specifications in the workshop manual.
   For additional information, refer to: Specifications (303-06 Starting System - 3.5L EcoBoost (272kW/370PS), Specifications).

1. If both signals do not meet specification replace the starter motor.
   For additional information, refer to: Starter Motor (303-06 Starting System - 3.5L EcoBoost (272kW/370PS), Removal and Installation).

1. Clear all CMT DTC s.