Selective Catalytic Reduction Catalyst: Notes

REMOVAL 

1. Disconnect and isolate the negative battery cable(s). Refer to BATTERY DISCONNECT - DUAL 12 VOLT BATTERY SYSTEM .
2. Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE .
3. Remove the transfer case skid plates. Refer to PLATE, SKID, TRANSFER CASE, REMOVAL AND INSTALLATION .

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   1 - Diesel Exhaust Fluid Supply Line

4. Disconnect the DEF fluid supply line quick connect fitting. Refer to QUICK-CONNECT FITTINGS .

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   1 - Diesel Exhaust Fluid Injector Wire Harness Connector

5. Disconnect the Diesel Exhaust Fluid (DEF) injector wire harness connector.
6. Remove the Particulate Matter (PM) sensor. Refer to SENSOR, PARTICULATE MATTER, REMOVAL AND INSTALLATION .
7. Remove the NOx sensor 1/2. Refer to SENSOR, NOX, REMOVAL AND INSTALLATION .
8. Remove the exhaust muffler. Refer to MUFFLER, EXHAUST, REMOVAL AND INSTALLATION  .

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   1 - Exhaust Valve Actuator Wire Harness Connector

   2 - Wire Harness Retainer

9. Disconnect the exhaust valve actuator wire harness connector.

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   1 - Exhaust Isolator

   2 - Exhaust Isolator Bolts

10. Remove the exhaust isolator bolts and the rear exhaust isolator.

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    1 - Exhaust Isolator

    2 - Exhaust Isolator Bolts

11. Remove the exhaust isolator bolts and the front exhaust isolator.

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    1 - Selective Catalytic Reduction Catalyst Nuts

    2 - Selective Catalytic Reduction Catalyst

12. Saturate the fasteners with Mopar® Rust Inhibitor. Allow 5 minutes for penetration.
13. Remove the SCR catalyst nuts and the SCR catalyst.
14. Remove and discard the flange gasket.

INSTALLATION 

During installation, torque the fasteners to the specifications in the torque table(s) below.

Follow the removal procedure in reverse for general reassembly of the components on the vehicle. The steps listed below are calling out specific procedures that should be followed during installation.

• Clean all gasket sealing surfaces.
• Install a NEW  Selective Catalytic Reduction (SCR) catalyst gasket.
• Check the exhaust system for contact with the body panels. A minimum of 25.4 mm (1.0 in.) is required between the exhaust system components and body/frame parts. Make the necessary adjustments, if needed.
• Using the scan tool, perform SCR System Catalyst Reset  function found under MISCELLANEOUS FUNCTIONS.