Catalytic Converter: Testing and Inspection
Catalytic Converter Inspection
Removal
1. Vehicle Lift
1. Raise the vehicle on a lift, and make sure it is securely supported.
2. Front Splash Shield
1. Remove the bolts (A), then remove the clips (B) that secure the front inner fender and the front splash shield (C) to the body.
2. From under the front bumper (D), remove the clips (E).
3. From under the body, remove the clips (F), then pull out the front splash shield.
3. Front Floor Undercover
1. Remove the bolts (A) and the clips (B, C) securing the front floor undercover (D), then remove the front floor undercover.
4. Both Windshield Wiper Arm Assemblies
NOTE: Set the wiper arms to the auto-stop position before removal.
1. Remove the caps (A) and nuts (B).
2. Remove the wiper arms (C).
5. Front Fender Trim - Both Sides
NOTE: Repeat on the opposite side.
1. Remove the clips (A, B).
2. Pull up the front fender trim (C) by hand to detach the clips (D), then remove the trim.
6. Cowl Top Cover - Both Sides
NOTE: Repeat this procedure on the opposite side.
1. Remove the clip (A).
2. Pull out the hood rear seal (B).
3. Detach the hooks, and remove the cowl top cover (C).
7. Side Cowl Cover - Both Sides
NOTE: Repeat on the opposite side.
1. Detach the hook (A) at the inside of the cowl cover (B).
2. Release the hooks (C) from the cowl cover and the front fender (D), then remove the side cowl cover (E).
3. Right side; Detach the windshield washer tube.
8. Center Cowl Cover
1. Remove the clips (A).
2. Carefully pull the center cowl cover (B) forward to release the hooks (C) from the windshield and the body.
9. Under-Cowl Panel
1. Disconnect the connector (A).
2. Remove the bolts and the nuts, then remove the under-cowl panel (B).
3. Remove the wire harness (C) from the under-cowl panel.
10. A/F Sensor
1. Remove the A/F sensor (A).
11. Exhaust Chamber Cover
1. Remove the exhaust chamber cover (A).
12. WU-TWC
1. Separate the lower side of the WU-TWC (A) from the under-floor TWC (B).
2. Remove the WU-TWC (C).
3. Remove the WU-TWC cover (D).
13. Secondary HO2S
1. Remove the secondary HO2S (A).
14. Under-Floor TWC
1. Remove the under-floor TWC (A).
Inspection
1. Catalytic Converter - Inspection
WU-TWC
TWC
1. If excessive exhaust system back-pressure is suspected, remove the WU-TWC and TWC from the vehicle. Using a flashlight (A), make a visual check for plugging, melting or cracking of the catalyst. Replace the TWC if any of the visible area is damaged or plugged.
Installation
1. Under-Floor TWC
1. Install the under-floor TWC (A) with new gaskets (B).
2. Secondary HO2S
1. Install the secondary HO2S (A).
3. WU-TWC
1. Install the upper side of the WU-TWC (A) with a new gasket (B).
2. Install the WU-TWC cover (C).
3. Install the lower side of the WU-TWC with a new gasket (A).
4. Exhaust Chamber Cover
1. Install the exhaust chamber cover (A).
5. A/F Sensor
1. Install the A/F sensor (A).
6. Under-Cowl Panel
1. Install the under-cowl panel (A), then install the bolts and the nuts.
2. Install the wire harness (B) to the under-cowl panel.
3. Connect the connector (C).
7. Center Cowl Cover
1. Install the center cowl cover (A). Make sure the clips (B) and the hooks (C) snap into place securely.
8. Side Cowl Cover - Both Sides
NOTE: Repeat on the opposite side.
1. Install the side cowl cover (A). Make sure the hooks (B) snap into place securely.
2. Right side; Install the windshield washer tube.
9. Cowl Top Cover - Both Sides
NOTE: Repeat this procedure on the opposite side.
1. Install the cowl top cover (A).
2. Install the hood rear seal (B).
3. Install the clip (C).
10. Front Fender Trim - Both Sides
NOTE: Repeat on the opposite side.
1. Install the front fender trim (A), then install the clips (B, C). Make sure the clips (D) snap into place securely.
11. Both Windshield Wiper Arm Assemblies
NOTE: Set the wiper arms to the auto-stop position before installation.
1. Install the wiper arms (A), the nut (B), and the caps (C).
12. Front Floor Undercover
1. Install the front floor undercover (A), then install the bolts (B) and the clips (C, D). Make sure the clips snap into place securely.
13. Front Splash Shield
1. Install the front splash shield (A), then install the bolts (B) and the clips (C, D). Make sure the clips snap into place securely.