2000 Ford Taurus SELFACTORY OEM SERVICE PROCEDURE

Micro ISO Relay

  1. Remove relay to be tested. Measure resistance between terminal No. 5 and all other terminals. See Fig 1 . If all resistance reading are greater than 5 ohms, go to next step. If any resistance reading is 5 ohms or less, replace relay.
  2. Measure resistance between terminals No. 3 and 4. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace relay.
  3. Apply battery voltage and ground between terminals No. 1 and 2. Measure resistance between terminals No. 3 and 5. Resistance should be 5 ohms or less. Measure resistance between terminals No. 3 and 4. Resistance should be greater than 5 ohms. If resistance is not as specified, replace relay. If resistance is as specified, relay is okay at this time.
Fig 1: Identifying Micro ISO Relay Terminals
G97J28141Courtesy of FORD MOTOR CO.
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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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