Basic Circuit Checks: Description: Note

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2005 Ford RV Cutaway, 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

The suspect circuit must be isolated before testing.
When disconnecting any harness connector, always inspect for damaged or pushed-out pins, corrosion, and loose wires. Repair as necessary.
The digital multimeter (DMM) must be set to the correct scale.
The techniques do no apply in all situations; therefore, it is necessary to carry out each pinpoint test step accurately and completely.
General resistance and voltage values are specified below. Always use the pinpoint test values if they differ.
Always turn the key to the OFF position unless directed otherwise by the pinpoint test.

Each of the following procedures requires the powertrain control module (PCM) and component to be disconnected to isolate the harness.