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Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Tests W/Codes - Turbo - MOTRONIC 4.3) >> Circuit Tests >> DTC 4-4-3 - Three-Way Catalyst (TWC) Efficiency

DTC 4-4-3 - Three-Way Catalyst (TWC) Efficiency

WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for other DTCs. If any DTC for misfiring is stored (DTCs 4-5-1, 4-5-2, 4-5-3, 4-5-4, 4-5-5, 5-4-2, 5-4-3, 5-4-4, 5-4-5, 5-5-1, 5-5-2, 5-5-3, 5-5-4 or 5-5-5) perform that testing first. If DTCs 4-3-5 or 4-3-6 are stored, perform testing for that DTC first. If none of the above DTCs 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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