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Home >> Oldsmobile >> 1999 >> Eighty-Eight Base >> Repair and Diagnosis >> Brakes >> Anti-Lock Brake System With Traction Control System >> Diagnostic Tests >> DTC C1272: Left Front TCS Prime Valve Malfunction

DTC C1272: Left Front TCS Prime Valve Malfunction

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
  2. Turn ignition off. Disconnect EBTCM connector. Separate EBTCM from BPMV assembly. Check EBTCM-to-BPMV connection for damage, corrosion, poor terminal contact, or for brake fluid. If connection is okay, go to next step. If connection is faulty, go to step 6)  .
  3. Connect breakout box to BPMV connector. Using DVOM, measure resistance between breakout box terminals No. 11 and 7. If resistance is 8-12 ohms, go to next step. If resistance is not 8-12 ohms, go to step 8)  .
  4. Using DVOM, measure resistance between breakout box terminal No. 11 and BPMV case. If resistance is infinite, go to next step. If resistance is not infinite, go to step 8)  .
  5. Disconnect breakout box. Reattach EBTCM to BPMV assembly. Reconnect EBTCM connector. Turn ignition on, with engine off. If DTC C1272 resets as current, go to step 9)  . If DTC C1272 does not reset, go to step 7)  .
  6. If EBTCM-to-BPMV connection is damaged, corroded or has poor terminal contact, replace EBTCM and/or BPMV as necessary. If brake fluid is present, replace EBTCM and BPMV assembly.
  7. With scan tool in ABS/TCS SPECIAL TESTS, run AUTO TEST. If DTC C1272 resets as current, go to next step. If DTC C1272 does not reset, see INTERMITTENTS & POOR CONNECTIONS  under DIAGNOSIS & TESTING.
  8. Replace BPMV assembly.
  9. Replace EBTCM.
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