Egr System Dtc Troubleshooting; Egr Insufficient Flow; Egr Valve Insufficient Lift - Honda 2002 Accord Manual

EGR System
DTC Troubleshooting
DTC P0401: EGR Insufficient Flow
1. Reset the ECM/PCM (see page 11-4).
2. Test-drive under the f o l l o w i n g conditions. T h e n
check for a T e m p o r a r y DTC w i t h the scan t o o l .
• Without any electrical load.
• Decelerate f r o m 55 m p h (88 km/h) for at least 5
seconds.
Is Temporary DTC P0401 indicated?
Y E S —Clean the intake m a n i f o l d EGR port w i t h
carburetor cleaner. Clean the passage inside the
EGR valve w i t h carburetor cleaner, or replace the
EGR v a l v e . •
NO —Intermittent failure, g o t o step 3.
3. Turn the ignition switch OFF.
4. Disconnect the EGR valve 6P connector.
5. Connect the battery positive terminal to EGR
valve connector terminal No. 4.
E G R V A L V E 6 P C O N N E C T O R
E - E G R
J_ „J
1 2 3
4 6
b
e
P G 1
T e r m i n a l s i d e o f m a l e t e r m i n a l s
6. Start the engine and let it idle, then connect the
battery negative terminal t o EGR valve 6P
connector t e r m i n a l No. 6.
Did the engine stall or run rough?
YES —Intermittent failure, system is OK at this
t i m e . B
NO —Clean the intake m a n i f o l d EGR port w i t h
carburetor cleaner. Clean the passage inside t h e
EGR valve w i t h carburetor cleaner, or replace t h e
EGR valve. •
DTC P1491: EGR Valve Insufficient Lift
1. Reset the ECM/PCM (see page 11-4).
2. Start the engine. Hold the engine at 3,000 r p m w i t h
no load (in Park or neutral) until the radiator fan
comes o n .
3. Check for a T e m p o r a r y DTC w i t h the scan tool.
4. Test-drive the vehicle for approx. 10 minutes.
Try t o keep the engine speed in the 1,700 — 2,500
r p m range.
Is Temporary DTC P1491 indicated?
Y E S - G o to step 5.
NO —Intermittent failure, system is OK at this t i m e .
Check for poor connections or loose wires at the
EGR valve and the ECM/PCM. •
5. Turn the ignition switch OFF.
6. Disconnect the EGR valve BP connector.
7. Start the engine and let it idle.
8. Measure voltage between EGR valve 6P connector
terminals No. 4 and No. 6.
E G R V A L V E 6 P C O N N E C T O R
4
E - E G R ( P N K )
2
3
6
P G 1 ( B L K )
W i r e s i d e o f f e m a l e t e r m i n a l s
Is there battery voltage?
Y E S - S u b s t i t u t e a known-good ECM/PCM and
recheck (see page 11-5). If the symptom/indication
goes away, replace the original E C M / P C M . •
N O - G o t o step 9.
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