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HOMESERVICE MANUALSFORD2007FOCUS SES, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 96 (HVAC CONTROL SYSTEM - GENERAL INFORMATION -- F250-F550 SUPER DUTY)DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMPINPOINT TESTSPINPOINT TEST E: NO COMMUNICATION WITH THE ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE
2007 Ford Focus SES, 4D Sedan, Standard

Pinpoint Test E: No Communication With The Electronic Automatic Temperature Control Module

2007 Ford Focus SES, 4D Sedan, StandardSECTION Pinpoint Test E: No Communication With The Electronic Automatic Temperature Control Module
WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. E1 CHECK CIRCUIT 676 (PK/OG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: EATC Module C228a.
    • Measure the resistance between the EATC module C228a pin 2, circuit 676 (PK/OG) and ground.
      Fig 1: Checking Circuit 676 (PK/OG) For An Open
      G03924291Courtesy of FORD MOTOR CO.
    • Is the resistance less than 25 ohms? 
    • Yes  : GO to E2.
    • No  : REPAIR circuit 676 (PK/OG) for an open. TEST the system for normal operation.
  2. E2 CHECK CIRCUIT 22 (LB/BK) FOR B+ 
    • Disconnect: EATC module C228b.
    • Measure the voltage between the EATC module C228b pin 11, circuit 22 (LB/BK) and ground.
      Fig 2: Checking Circuit 22 (LB/BK) For B+
      G03910082Courtesy of FORD MOTOR CO.
    • Is the voltage B+? 
    • Yes  : GO to E3.
    • No  : REPAIR circuit 22 (LB/BK) for an open. TEST the system for normal operation.
  3. E3 CHECK CIRCUIT 296 (WH/VT) FOR B+ 
    • Key in ON position.
    • Measure the voltage between the EATC module C228b pin 22, circuit 296 (WH/VT) and ground.
      Fig 3: Checking Circuit 296 (WH/VT) For B+
      G03910083Courtesy of FORD MOTOR CO.
    • Is the voltage B+? 
    • Yes  : REFER to MODULE COMMUNICATIONS NETWORK to diagnose a network concern.
    • No  : REPAIR circuit 296 (WH/VT) for an open. TEST the system for normal operation.
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