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 3-1-1 (SPEEDOMETER SIGNAL)
1993 Volvo 960 4D Wagon, AW30-43
Code 3-1-1 (Speedometer Signal)
1993 Volvo 960 4D Wagon, AW30-43SECTION Code 3-1-1 (Speedometer Signal)
- Control unit is dependent on this signal for WOT enrichment, fan control, etc. A fault code will be set if speed exceeds 3390 RPM, load signal corresponds to part load and signal is absent for 3 seconds.
- To check speedometer signal, raise vehicle with rear wheels suspended. Connect Measuring Unit (999-3070 ) to ECU. See CONNECTING MEASURING UNIT TO ECU . Connect voltmeter between measuring unit terminals No. 9 and 19. Turn ignition on. Spin rear wheels, and check voltmeter. Voltage should be 0.1-12.0 volts.
- If voltage is not present, check wiring between control unit and instrument cluster. Connect ohmmeter between measuring unit terminal No. 9 and terminal at rear of instrument cluster (Green/Orange wire). Ohmmeter should indicate zero ohms.
- If no reading is obtained, check wiring between instrument cluster and control unit. If reading is obtained, check wiring between instrument cluster and rear axle. On A/T models, check test mode No. 1 if speed signal fault is obtained. See TEST MODE NO. 1 under RETRIEVING CODES.
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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.