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 3-1-4 (CAMSHAFT SENSOR SIGNAL)
1993 Volvo 960 4D Wagon, AW30-43
Code 3-1-4 (Camshaft Sensor Signal)
1993 Volvo 960 4D Wagon, AW30-43SECTION Code 3-1-4 (Camshaft Sensor Signal)
- Camshaft sensor enables control unit to determine which cylinder requires fuel and ignition. A fault code is recorded if signal remains constantly high or low for more than 30 seconds.
- To check camshaft sensor signal, remove fuse No. 31 to prevent engine from starting and connect Measuring Unit (999-3070 ) to ECU. See CONNECTING MEASURING UNIT TO ECU . Turn ignition switch to ON position. Connect voltmeter across measuring unit terminals No. 8 and 19. Operate starter motor. Voltage should oscillate between .1 and .5 volt. Install fuse No. 31.
- If signal is absent or faulty, ensure voltage across measuring unit terminals No. 10 and 30 is about 11 volts. Turn ignition off. Ensure measuring unit terminal No. 30 is grounded. Connect an ohmmeter between measuring unit terminals No. 30 and 19. 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:
- • 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.