Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLVO1993960 4D WAGON, AW30-43REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESFAULT CODE TESTINGCODE 2-4-3 (THROTTLE SWITCH SIGNAL ABSENT OR FAULTY)
1993 Volvo 960 4D Wagon, AW30-43
Code 2-4-3 (Throttle Switch Signal Absent Or Faulty)
1993 Volvo 960 4D Wagon, AW30-43SECTION Code 2-4-3 (Throttle Switch Signal Absent Or Faulty)
- Enter test mode No. 2. See TEST MODE NO. 2 under RETRIEVING CODES. Turn throttle slightly. Throttle function is correct in idling position if flashing code 3-3-2 is displayed.
- Turn throttle to full-load position and release. Throttle function is correct in full-load position if flashing code 3-3-3 is displayed.
- Connect Measuring Unit (999-3070 ) to ECU. See CONNECTING MEASURING UNIT TO ECUΒ . Turn ignition on. Connect voltmeter between measuring unit terminals No. 30 and 53. Voltmeter should indicate about 0.5 volts at idle and about 4.5 volts at full load.
- Connect voltmeter between measuring unit terminals No. 12 and 30. Voltmeter should indicate 5 volts. Turn ignition off. Ensure measuring unit terminal No. 30 is grounded. Connect an ohmmeter between measuring unit terminals No. 19 and 30. Ohmmeter should indicate zero ohms.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.