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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 1-5-4 - EGR System Leakage

DTC 1-5-4 - EGR System Leakage

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. 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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