Catalyst, Selective Catalytic Reduction (SCR): Installation

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1. If removed, install the NOx sensor (1/2) (2) and tighten to 55 N.m (41 ft. lbs.).
2. If removed, install the Particulate Matter (PM) sensor (1/2) (2) and tighten to 60 N.m (44 ft. lbs.).

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3. Clean all the gasket sealing surfaces.
4. Install NEW  Selective Catalytic Reduction Catalyst (SCR) flange gasket (6).
5. Position the SCR (9) onto flange and install the flange nuts (7) finger tighten.
6. Install the isolators (8, 10) onto the SCR hanger rods.
7. Tighten the flange nuts (7) to 32 N.m (24 ft. lbs.).
8. Install the tail pipe assembly (12). Refer to TAILPIPE, EXHAUST, INSTALLATION .
9. Check the exhaust system for contact with the body panels. A minimum of 25 mm (1.0 in.) is required between the exhaust system components and body/frame parts. Make the necessary adjustments, if needed.

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10. Connect the PM sensor wire harness connector (1).

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11. Install the module mounting bracket (2). Tighten the nuts to 11 N.m (8 ft. lbs.).

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12. Connect the NOx sensor 1/2 wire harness connector (2).

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13. Install the NOx sensor 1/2 module cover (1). Tighten the nuts to 8 N.m (71 in. lbs.).

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14. Connect the DEF fluid supply line (1).
15. Connect the DEF injector wire harness connector (3).
16. Connect the front exhaust temperature sensors wire harness connector (1).
17. If equipped, install skid plates.
18. Remove support and lower the vehicle.
19. Connect negative battery cable.
20. Using a scan tool, perform SCR System Catalyst Reset  function found under MISCELLANEOUS FUNCTIONS.