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

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: Measuring Resistance Between Connector And Ground
  Courtesy 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.
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: Measuring Voltage Between EATC Module C228B Pin 11, Circuit 22 (LB/BK) And Ground
  Courtesy 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.
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: Measuring Voltage Between EATC Module C228B Pin 22, Circuit 296 (WH/VT) And Ground
  Courtesy 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. 412-00-30