1992 Volvo 240 GL, StandardFACTORY OEM SERVICE PROCEDURE

Testing Fuel System Components

  1. Turn ignition on. Locate diagnostic unit, and remove its cover. Connect selector cable to socket No. 2. Depress push button 3 times. Each time button is depressed, hold it for more than 1 second and less than 3 seconds. While LED flashes, fuel injectors and idle valve should operate. Check by listening or feeling component when it is activated. If injectors fail to operate and LED flashes, go to step 2). If idle valve fails to operate and LED flashes, go to step 3).
  2. To test fuel injector circuit, connect an ohmmeter between harness side of fuel system ECU connector terminals No. 9 (Orange wire on 240; Blue/Yellow wire on 740/940) and No. 18 (Green/White wire on 240; Gray wire on 740/940). Resistance should be 4 ohms.
  3. If resistance is 5.3 ohms, one injector or wire to it is faulty. If resistance is 8.0 ohms, 2 injectors or wires to them are faulty. If resistance is 16 ohms, 3 injectors or wires to them are faulty. If resistance is incorrect, remove each injector connector. Each injector connector should have 16 ohms resistance. Repair as required.
  4. To test idle valve circuit, connect an ohmmeter between fuel system ECU connector terminals No. 33 (Green/Red wire on 240; Red/Black wire on 740/940) and No. 9 (Orange wire on 240; Blue/Yellow wire on 740/940). Resistance should be 8 ohms. If resistance is not as specified, check wiring and connections between idle valve and ECU. If wiring is okay, check idle valve. See IDLE AIR CONTROL VALVE in procedures in SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE Section.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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