Honda ACCORD HYBRID 2005 Service Manual page 633

D T C T r o u b l e s h o o t i n g
DTC P0401: EGR Insufficient Flow
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 , then let it idle.
4. Do the EGR TEST in the INSPECTION MENU w i t h
the HDS.
Is the result OK?
Y E S — G o t o step 5.
NO—Go to step 7.
5. Test-drive under these conditions:
• Engine coolant temperature above 158 °F (70 °C)
• Transmission in D position
• Vehicle speed at 25 m p h (40 km/h) or more, and
engine speed between 1,100 r p m and 3,000 r p m
• During t h e drive, decelerate (with the throttle
fully closed) for 5 seconds
6. M o n i t o r the OBD STATUS for DTC P0401 in the
DTCs MENU w i t h the HDS.
Does the screen indicate FAILED?
Y E S — R e m o v e the intake manifold cover (see step
1 on page 9-3), and clean the intake m a n i f o l d EGR
port w i t h throttle plate and induction cleaner, then
g o t o s t e p 9 .
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 on. If the screen indicates O U T OF
CONDITION, go to step 5 and recheck.
7. Turn the ignition switch OFF.
8. Replace the EGR valve (see page 11-404).
9. Turn the ignition switch ON (II).
10. Reset the PCM w i t h the HDS.
11. Do the PCM idle learn procedure (see page 11-340).
12. Test-drive under these conditions:
• Engine coolant temperature above 158 °F (70 °C)
• Transmission in D position
• Vehicle speed at 25 m p h (40 km/h) or m o r e , and
engine speed between 1,100 r p m and 3,000 r p m
• During the drive, decelerate (with the throttle
fully closed) for 5 seconds
13. Check for T e m p o r a r y DTCs or DTCs w i t h the HDS.
Are any Temporary DTCs or DTCs indicated?
Y E S — I f DTC P0401 is indicated, check for poor
connections or loose terminals at the EGR valve
and the PCM. If the connections are OK, go t o step
I 15. If any other Temporary DTCs or DTCs are
indicated, go to the indicated D T C s
t r o u b l e s h o o t i n g .
N O — G o t o step 14.
14. M o n i t o r the OBD STATUS for DTC P0401 in the
DTCs MENU w i t h the HDS.
Does the screen indicate PASSED?
Y E S — T r o u b l e s h o o t i n g is complete. •
NO—If the screen indicates FAILED, go to step 1
and recheck. If the screen indicates EXECUTING,
keep driving until a result comes o n . If the screen
indicates OUT OF CONDITION, g o to step 12 and
recheck.
(cont'd)
11-393