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Engine Cooling Diagnostic System Check

  1. Connect scan tool. If scan tool powers up, go to next step. If scan tool does not power up, see TEST A: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition on. Try to establish communication with Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). If scan tool communicates with all modules listed, go to next step. If scan tool does not communicate with all modules listed, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select Powertrain Control Module (PCM) DTCs function on scan tool. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCS, see appropriate article in ENGINE COOLING for further diagnosis.
  4. If scan tool does not display any DTCs that begin with a "U", see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool displays any DTCs that begin with "U", see TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
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