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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 1-5-4: EGR System Leakage

Code 1-5-4: EGR System Leakage

  1. Start and run engine at idle. If engine runs unevenly at idle, go to next step. If engine runs smoothly at idle, fault is intermittent. Go to step 5).
  2. Operate engine at idle. Disconnect EGR connector. If engine still runs unevenly, go to next step. If engine now runs smoothly, check wiring between EGR controller connector terminal No. 1 and ECM terminal A40 for a short to ground.
  3. Operate engine at idle. Carefully remove Yellow hose from EGR controller. If engine still runs unevenly, go to next step. If engine now runs smoothly, test system using new EGR controller.
  4. Operate engine at idle. Carefully remove Yellow hose from EGR valve. If engine still runs unevenly at idle, test system using a new EGR valve. If engine now runs smooth at idle, check if Yellow hose is blocked or kinked. Replace as necessary.
  5. Check wiring between EGR controller connector terminal No. 2 and ECM connector terminal A40 for possible intermittent short circuits to ground. Ensure EGR controller is operating. Ensure EGR valve is not sticking.
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