Starter Amperage Draw Test
WARNING: This page is about a different car, the 2024 Ford Transit-350 HD, 2024 Ford Transit-350, 2024 Ford Transit-250, and 2024 Ford Transit-150. However, it is still accessible from the selected car via links, so may be relevant.
For information on Ford Color Coded Illustrations refer to OEM COLOR CODING
NOTE:
Make sure the test is performed with the engine at 16 deg.C or above.
- Make sure the battery is fully charged. For additional information, refer to: Specifications .
- Disable the fuel system. For gasoline engines, For additional information, refer to: FUEL SYSTEM PRESSURE RELEASE . For diesel engines, refer to: Wiring service information for fuel pump inline connector location.
- Connect the 0-500-amp probe to the starter B+ Cable and to the VCMM.
- Connect the VCMM and use the Oscilloscope option scaled to 100/A/Div. Add PIDS "Ambient Air Temp" and "Engine RPM".
- Crank the engine, not 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.
- Record the results, specifically Ambient Air Temperature (AAT), Starter Current (Current Clamp), and Cranking speed (PCM signal Engine_Speed).
- Compare the results to the specifications in the service information. For additional information, refer to: SPECIFICATIONS .
- If both signals do not meet specification, replace the starter motor. For additional information, refer to: Starter Motor .
- Clear all CMT DTC.