When the battery is disconnected, a number of systems will have to be re-learned before they can be used successfully. To change the water pump, firstly, disconnect the cable with the negative terminal of the battery and take off the engine cover. Lift the front end of the car and place it firmly on jackstands, then drain the cooling system by removing the lower splash shield beneath the engine and disposing of the old coolant in a proper manner or reusing the new version of the same. In the case of the four-cylinder BPY engine, take out the timing belt, then the water pump mounting fasteners and the water pump. Attach the house and block together with an O-ring and discard it between them replacing with a new one. Fill up and bleed the cooling system and then start the engine to ensure that there is no leakage. With four-cylinder CCTA and CBFA engines, it is necessary to disassemble many parts, such as small coolant pipe, charge air pipe, and so forth, being careful to re-install O-ring of the coolant pipe-to-water pump housing. Disassemble the throttle body assembly, wiring harness strap, after-run coolant pump bracket, and radiator hoses and then disassemble the water pump and its surroundings, cleaning them off and replacing seals. In the case of five-cylinder engines, disassemble battery and battery tray, drivebelt, exhaust pipe and other parts, install the new water pump and the sealed plug with the water pump facing downwards and tighten the bolts to the desired torque. Some models have after-run coolant pump, which under the car should be raised, coolant emptied and the hoses and electrical connectors unattached and attached and the cooling system refilled and bled again.