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DTC C0269 Or C0274: Excessive Dump/Isolation Time: Diagnosis

WARNING: This page does not describe the selected car, but rather 54 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Sonoma, and 1999 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
  2. Turn ignition off. Disconnect 2-pin EBCM harness connector. Inspect connector for damage or corrosion which could result in loss of power to EBCM. If connector is okay, go to next step. If connector is not okay, go to step 11)  .
  3. Check resistance between ground and 2-pin EBCM harness connector terminal "B". If resistance is 0-2 ohms, go to next step. If not, go to step 12)  .
  4. Check voltage between ground and 2-pin EBCM harness connector terminal "A". If voltage reading is greater than 10 volts, go to step 6)  . If not, go to next step.
  5. Inspect ABS 60-amp MAXI-fuse. If fuse is open, go to step 13)  . If fuse is okay, go to step 14)  .
  6. Turn ignition off. Disconnect 10-pin EBCM harness connector. Inspect connector for damage or corrosion which could result in loss of power to EBCM. If connector is okay, go to next step. If connector is not okay, go to step 15)  .
  7. Check resistance between ground and terminal J of 10-pin EBCM harness connector. If resistance is 0-2 ohms, go to next step. If not, go to step 16)  .
  8. Turn ignition switch to RUN position. Check voltage between ground and 2-pin EBCM harness connector terminal "A". If voltage reading is greater than 10 volts, go to step 10)  . If not, go to next step.
  9. Inspect ABS 10-amp fuse. If fuse is open, go to step 17)  . If fuse is okay, go to step 18)  .
  10. Turn ignition off. Disconnect 10-pin and 2-pin EBCM harness connector. Inspect connector for damage or corrosion which could result in loss of power to EBCM. Repair any evident damage. Reconnect all connectors. Clear all DTCs using the scan tool. Test drive the vehicle above 10 mph. If DTC resets, go to step 19)  . If not, malfunction is intermittent, see DIAGNOSTIC AIDS .
  11. Repair 2-way EBCM connector.
  12. Repair open or high resistance in ground circuits.
  13. Repair short to ground in circuit No. 442.
  14. Repair open or high resistance in circuit No. 442.
  15. Repair the 10-way connector.
  16. Repair open or high resistance in signal and power ground circuits.
  17. Repair short to ground in circuit No. 441.
  18. Repair open or high resistance in circuit No. 441.
  19. Replace the EBCM.
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