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P0562 System Voltage Low • Reverse battery cable connection (+/- reverse) • Faulty alternator P0563 System Voltage High P0650 Malfunction Indication Lamp • Open or short between lamp and ECM • Faulty lamp P1624 Cooling Fan Relay Circuit • Open or short between relay and ECM • Short to GND between relay and ECM • Open between relay and ECM • Faulty relay P1625 Cooling Fan Relay Circuit MAJOR SENSOR REFERENCE WAVE-FORMS |