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Home >> Chevrolet >> 1998 >> Forward Control P30, 6.5 F, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Tests W/Codes - 5.7L) >> Diagnostic Trouble Codes >> DTC P0125 - ECT Excessive Time To Closed Loop >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Allow engine to completely cool. Install scan tool. Turn ignition on, engine off. Using scan tool, compare ECT and IAT sensor values. If values are the same or close to each other, go to next step. If values are not the same, go to DTC P0117.
  3. Start engine. Using scan tool, monitor ECT. If engine coolant temperature steadily rises to greater than 95°F (35°C) within 9 minutes, see DIAGNOSTIC AIDS. If engine coolant temperature does not steadily rise to greater than 95°F (35°C) within 9 minutes, go to next step.
  4. Check cooling system coolant level. Repair as necessary. If cooling system is okay, go to next step.
  5. Compare ECT displayed on scan tool to actual coolant temperature. If values are about the same, repair cooling system. If values are not about the same, go to next step.
  6. Replace ECT sensor. After replacing sensor, go to next step.
  7. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
  8. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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