What is the correct procedure for overhauling and reinstalling the rear suspension, including the rear shock absorber and coil spring assembly on 2004 Toyota Matrix?

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Rejection of the rear suspension starts with wheel removal and the subsequent removal of deck board No.2, deck board sub-assy, deck floor box rear, luggage compartment tray and shock absorber head cover. The next step involves supporting the rear axle beam assembly with a jack while removing two nuts with bolts and the nut and rear shock absorber LH cushion retainer before separately removing the rear shock absorber with coil spring. Special Service Tool: 09727-30021 must be applied to compress the coil spring rear LH when performing this task because an impact wrench should never be used to avoid tool damage. Using a 6 mm hexagon wrench to hold the piston rod will enable you to remove the nut before extracting rear shock absorber cushion washer No.1, rear suspension support, rear spring front bracket sub-assy LH, LH support assembly rear suspension, rear coil spring insulator upper LH, rear spring bumper No.1 LH along with coil spring rear LH. The shock absorber assembly rear LH should undergo testing by applying compression and extension to its rod while listening for unusual noises and checking for abnormal resistance; then replace with a new assembly when any issues arise. For the installation of rear shock absorber assembly LH insert the coil spring rear LH into the assembly after compressing it again with the same special service tool. Position the lower end of the spring inside the spring lower seat gap. The technician should install the rear spring bumper No.1 LH along with the LH support assembly rear suspension and then position the rear coil spring insulator upper LH on the rear spring front bracket sub-assy LH. Follow these steps: Place the rear suspension support and rear shock absorber cushion washer No.1, briefly tighten a new center nut then eliminate the special service tool before checking the rear spring front bracket sub-assy LH orientation along with securing the nut through a 6 mm hexagon wrench while tightening the nut to 56 Nm (571 kgf-cm, 41 ft. lbs.). The next procedure involves installing the rear shock absorber with coil spring then fastening it using two nuts and a bolt while torquing them to 80 Nm (816 kgf-cm, 59 ft. lbs.). Reinsert the luggage compartment tray followed by the deck board sub-assy and deck board No.2 and deck floor box rear and shock absorber head cover. The suspension needs stabilization when the rear wheel is installed and the vehicle reaches floor height before tightening the wheel to 76 ft. lbs (1,050 kgf-cm or 103 Nm). The stabilization process requires multiple bounces of the vehicle. The repair is complete by tightening the shock absorber rear nut to 80 Nm then inspecting the wheel alignment. Drilling a cylinder hole during the disposal process of shock absorber assembly rear LH requires fully extending the shock absorber rod while discharging the gas inside but ensuring to maintain safe distances from flying parts and recording that the non-poisonous gas appears colorless with no odor.

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