If the battery is disconnected, several systems must be re-learned before they will work properly. Begin by relieving the fuel system pressure. Disconnect the cable from the negative battery terminal. Working from above in the engine compartment, remove the engine cover and air filter housing. To disconnect the fuel supply line, fuel bleeder line, and vacuum line (if equipped), press the circlip at the outer end of the connectors, then lift up on the connector to remove it, covering the fuel line openings to prevent debris from entering the fuel system. Disconnect the electrical connectors from the fuel injectors, Camshaft Position sensor, and the EVAP canister purge valve, and unclip the wiring harness and EVAP hose clamp from the intake manifold before opening the locking ring to remove the EVAP canister purge valve. Remove the throttle body and the power steering pump and bracket. On CBUA models, the secondary air injection pump must be removed to access the bracket bolts at the bottom of the intake manifold. Disconnect the Manifold Absolute Pressure sensor electrical connector and remove the harness from the manifold. Remove the intake manifold support bracket fasteners, then push the oil dipstick tube and grommet out from the molded bracket on the manifold. Remove the oil dipstick tube-to-engine block retaining fastener and rotate the tube out of the way. The intake manifold is secured with nine bolts, four below and five along the top; unscrew the bolts and pull the intake manifold away from the engine at a slight angle for clearance, ensuring the bolts remain with the manifold during removal. For installation, use new manifold gaskets and install the intake manifold, tightening the bolts in several stages, working from the center out, to the specified torque. The remainder of the installation follows the reverse order of removal.