Code 3-1-1 (Speedometer Signal)

Turn ignition off. Remove panel under instrument panel on driver's side. Disconnect 12-pin connector from speedometer. On 240 series, connect an ohmmeter between Blue wire of speedometer connector and terminal No. 34 (Blue wire) of fuel system ECU. On 740 GL, connect ohmmeter between Violet/White wire of speedometer connector and terminal No. 34 (Violet/White wire) of fuel system ECU. Resistance should be zero ohms. If resistance is present, check wiring and connectors. If problem persists, check speedometer operation and related wiring.