Honda ACCORD HYBRID 2005 Service Manual page 628

Catalytic Converter System
D T C T r o u b l e s h o o t i n g
DTC P0420: Rear Bank Catalyst System
Efficiency Below Threshold (Bank 1)
DTC P0430: Front Bank Catalyst System
Efficiency Below Threshold (Bank 2)
NOTE:
• These catalysts are m o u n t e d to the cylinder head.
• If some of the DTCs listed b e l o w are stored at the
same t i m e as DTC P0420 and/or P043CT, troubleshoot
those DTCs first, then recheck for DTC P0420 and/or
P0430*.
P0137, P0138, P0157, P0158, P2270, P2271, P2272*,
P2273*: Secondary H 0 2 S (Sensor 2)
P0141, P0161 *: Secondary H 0 2 S (Sensor 2) heater
• Poor quality fuel can cause these DTCs.
• Information marked w i t h an asterisk (*) applies to the
front bank (Bank 2).
1. Turn the ignition switch ON (II).
2. Clear the DTC w i t h the HDS.
3. Start the engine. Hold the engine speed at
3,000 r p m w i t h o u t load (in Park or neutral) until the
radiator fan comes o n , t h e n let it idle.
4. Test-drive under these conditions:
• Engine coolant temperature above 158 °F (70 °C)
• Transmission in D position
• Vehicle speed between 45 m p h (72 km/h) and
75 m p h (120 km/h) for 5 minutes or more w i t h
cruise control set
• Maintain the vehicle speed at 55 m p h (88 km/h)
for 5 minutes or more w i t h cruise control set
5. Monitor the OBD STATUS for DTC P0420 and/or
P0430* in the DTCs M E N U w i t h the HDS.
Does the screen indicate EXECUTING?
Y E S — G o t o step 6.
NO—Go to step 4 and recheck.
6. Continue test-driving until a result comes on.
7. Monitor the OBD STATUS for DTC P0420 and/or
P0430* in the DTCs M E N U w i t h the HDS.
Does the screen indicate FAILED?
Y E S — G o t o step 8.
NO—If the screen indicates PASSED, intermittent
failure, system is OK at this t i m e . If the screen
indicates EXECUTING, keep driving until a result
comes o n . If the screen indicates OUT OF
CONDITION, go to step 4 and recheck.
8. Turn the ignition switch OFF.
9. Replace the WU-TWC (see page 11-390).
10. Turn the ignition switch ON (II).
11. Reset the PCM w i t h the HDS.
12. Do the PCM idle learn procedure (see page 11-340).
11-388