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Home >> Volvo >> 1995 >> 850 Base, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Turbo >> Diagnostic Trouble Code Testing >> MOTRONIC 4.3 Control System >> Code 4-4-3: TWC Efficiency

Code 4-4-3: TWC Efficiency

  1. Check for other codes. If any code for misfiring is stored (Codes 4-5-1, 4-5-2, 4-5-3, 4-5-4, 4-5-5, 5-4-2, 5-4-3, 5-5-1, 5-5-2, 5-5-3, 5-5-4, 5-5-5, 5-4-4 or 5-4-5) perform that testing first. If Codes 4-3-5 or 4-3-6 are stored, perform testing for that code first. If none of the above codes are stored, go to next step.
  2. Perform a compression check on all cylinders. Repair as necessary. If compression is okay, go to next step.
  3. Check for air leakage in intake system. Repair as necessary. If there is no air leakage in intake system, check for air leakage in exhaust system. Repair as necessary. If there is no air leakage in exhaust system, check fuel and residual pressure. Repair as necessary. If fuel and residual pressure are okay, retest using new TWC.
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