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Diagnostic System Check - Engine Cooling

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install a scan tool. If the scan tool powers up, go to next step. If the scan tool does not power up, see SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Turn ON the ignition, with the engine OFF. Attempt to establish communication with the Powertrain Control Module (PCM). If the scan tool communicates with the PCM, go to next step. If the scan tool does not communicate with the control modules, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Select the PCM display DTCs function on the scan tool. If the scan tool displays any DTCs, go to next step. If the scan tool does not display any DTCs, go to SYMPTOMS - ENGINE COOLING  under TROUBLE SHOOTING.
  4. If the scan tool displays any DTCs which begin with a "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If the scan tool does not display any DTCs which begin with a "U", go to next step.
  5. Does the scan tool display DTC P0112 or P0113? If yes, diagnose those DTCs first. See appropriate SELF-DIAGNOSTICS article in FAULT ISOLATION in ENGINE PERFORMANCE. If not, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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