A/C Signal: Testing and Inspection

INSPECTION
The "SCAN" tool can be used in diagnosing this system, as it has the ability to read the A/C request input to the Electronic Control Module (ECM) as well as displaying when the ECM has commanded the A/C clutch "ON".

For diagnosing the electrical portion of the A/C circuit, refer to Computers and Controls / System Diagnosis / Procedures / Diagnostic Charts / Chart C-10C. Testing and Inspection