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Home >> Ford >> 2007 >> Expedition 4WD V8-5.4L >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Pinpoint Tests >> Test I: The EATC System Is Inoperative, Intermittent or Incorrect Operation
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Test I: The EATC System Is Inoperative, Intermittent or Incorrect Operation

PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT OPERATION


I1-I6:






I7-I13:






I13-I14:






Normal Operation
Under normal operation, the electronic automatic temperature control (EATC) module receives a ground through circuit GD133 (BK). The EATC module is supplied constant battery voltage through circuit SBP15 (WH/RD) and ignition switched voltage through circuit CBP37 (WH).

NOTE: For a complete explanation of the EATC system functions, refer to Description and Operation.

Possible Causes
- Fuse(s)
- An open in circuit GD133 (BK), SBP15 (WH/RD) or CBP37 (WH)
- EATC module
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