Dual Electronic Automatic Temperature Control (DATC) Module Diagnostic Trouble Codes - DTCs

If using the diagnostic tool or front panel diagnostics to check for DATC DTCs:

1. Check continuous DTCs.
2. Run DATC self-test. Refer to FRONT PANEL DATC SELF-TEST (ON-DEMAND DIAGNOSTIC TROUBLE CODES - DTCS) .

General Information: 

• If the DTC is continuous only and does not appear in the self-test, this indicates an intermittent fault condition, such as a poor wiring connection or a loose terminal. If the DATC does not appear after running the self-test it may also indicate that the DTC may no longer exist.
• If the DTC is continuous and appears in the self-test, this indicates a hard fault. A hard fault suggests a permanent wiring failure, disconnected connector or component failure.