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CIRCUIT DIAGRAMS B-147 METER AND GAUGE (See P.B-148,152.) OPERATION When the ignition switch is at the “ON” position, the fuel gauge is activated. D When there is much fuel, the unit’s resistance is small and the current flowing in the circuit is great, so the gauge’s indicator indicates in the “Full” area. D When there is little fuel, the unit’s resistance is high and the current flowing in the circuit is small, so the gauge’s indicator indicates in the “Empty” area. <Engine coolant temperature gauge> When the ignition switch is at the “ON” position, the engine coolant temperature gauge is activated. D When the engine coolant temperature is high, the unit’s resistance is low and there is a great flow of current in the circuit, so the gauge’s indicator indicates in the “H” area. D When the engine coolant temperature is low, the unit’s resistance is high and there is a small flow of current in the circuit, so the gauge’s indicator indicates in the “C” area. TROUBLESHOOTING HINTS incorrectly. (1) The fuel gauge indicates “F” when the fuel gauge unit (sub) connector is disconnected and the “1” terminal is earthed. Check fuel gauge. 2. Engine coolant temperature gauge does not operate, or registers incorrectly. (1) When the engine coolant temperature gauge is earthed with its connector unplugged, it registers “H”. Check engine coolant temperature gauge unit. |