Pinpoint Test J: The Dual Automatic Temperature Control (DATC) Module Does Not Respond To The Diagnostic Tool: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

J1 CHECK THE DATC MODULE C228A FOR DAMAGE
- Key in OFF position.
- Disconnect: DATC Module C228a.
- Inspect the DATC module C228a for damage.
- Is the DATC module C228a OK?
- Yes : GO to J2.
- No : REPAIR the DATC module C228a as necessary. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
J2 CHECK MEDIUM SPEED CONTROLLER AREA NETWORK (CAN) CIRCUITS 2180 (WH/BK) AND 2181 (BK/YE) BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE DATC MODULE C228A FOR AN OPEN
- Measure the resistance between the DATC module C228a-12, circuit 2180 (WH/BK), harness side and the DLC C251-3, circuit 2180 (WH/BK), harness side; and between the DATC module C228a-13, circuit 2181 (BK/YE), harness side and the DLC C251-11, circuit 2181 (BK/YE), harness side.
  
  Fig 1: Measuring Medium Speed Controller Area Network (CAN) Circuits 2180 (WH/BK) And 2181 (BK/YE) Between Data Link Connector (DLC) C251 And DATC Module C228A
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to J3.
- No : REPAIR the circuit in question. CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
J3 CHECK FOR CORRECT DATC MODULE OPERATION
- Disconnect all the DATC module connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the DATC module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new DATC module. REFER to CONTROL COMPONENTS . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .