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Coil Current Draw Test

  1. Verify the battery state of charge. Refer to Electrical/Battery System/BATTERY - Diagnosis and Testing .
  2. Connect an ammeter (0 to 10 ampere scale selected) in series with the A/C clutch coil feed terminal using Back Probe Tool 6801. Connect a voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the A/C clutch coil.
  3. With the A/C-heater control in any A/C mode and the blower motor at low speed, start the engine and allow it to run at a normal idle speed.
  4. The A/C clutch should engage immediately and the A/C clutch coil supply voltage should be within two volts of the battery voltage. If the A/C clutch coil supply voltage is OK, go to  5. If the A/C clutch coil supply voltage is not within two volts of battery voltage, test the clutch coil feed circuit for excessive voltage drop and repair as necessary.
  5. See the A/C Clutch Coil Specifications chart for the acceptable A/C clutch coil current draw. Specifications apply for a work area temperature of 21° C (70° F). If voltage is more than 12.5 volts, add electrical loads by turning on electrical accessories until voltage reads below 12.5 volts.
A/C CLUTCH COIL SPECIFICATIONS

A/C Compressor  Coil Resistance  Current Draw 
Denso 10S15/10S17 3.6 ± 0.2 ohms 3.2 - 3.3 amps @ 12V ± 0.5V
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