Honda S2000 Service Manual page 293

DTC P0301: No. 1 Cylinder Misfire
DTC P0302: No. 2 Cylinder Misfire
DTC P0303: No. 3 Cylinder Misfire
DTC P0304: No. 4 Cylinder Misf ire
1. After checking and recordingthe freeze data, reset
the ECM (see page 1 1-4). lf there is no freeze data of
the misfire, just clear the DTC.
2. Start the engine, listen for a clicking sound at the
injector at the problem cylinder
Does it click?
YES Go to step 3.
NO Go to step 30.
3. Turn the ignition switch OFF.
4. Exchange the ignition coil from the problem
cylinder with one from another cylinder.
5. Test-drive the vehicle severaltimes in the range of
the freeze data or under various conditions if there
was no freeze data.
6, Check for a DTC or Temporary DTC with the scan
t o o l .
ls DTC P0301, P0302, P0303 or P0304, or
Temporary DTC P1399 indicated?
YES Go to step 7.
NO Intermittent misfire due to poor contact atthe
i g n i t i o n c o i l c o n n e c t o r ( n o m i s f i r e a t t h i s t i m e ) . 1
7 . Determine which cylinder(s) had the misfire.
Does the misfire occut in the othet cylinder wherc
the ignition coil was exchanged?
Y E S R e p l a c e t h e f a u l t y i g n i t i o n c o i l . t
NO Go to step 8.
Turn the ignition switch OFF.
Exchange the spark plug from the problem cylinder
with one from another cylinder.
Test-drive the vehicle severaltimes in the range of
the freeze data or under various conditions if there
was no freeze data.
Check for DTC or Temporary DTC with a scan tool.
ls DTC P0301, P0302, P0303 or P0304, or
Temporary DTC P1399 indicated?
YES Go to step 12.
NO Intermittent misfire due to spark plug fouling,
etc. (no misfire at this time).I
Determine which cylinder had the misfire.
Does the misf ire occur in the other cylinder where
the spark plug was exchanged?
YES Replace the faulty spark plug.t
NO Go to step 13.
Turn the ignition switch OFF.
Exchange the injector from the problem cylinder
w i t h o n e f r o m t h e a n o t h e r c y l i n d e r .
Let the engine idle for 2 minutes.
Test-drive the vehicle severaltimes in the range of
the freeze data or under various conditions if there
was no freeze data.
(cont'd)
8 .
9 .
' 1 0 .
' l t .
, l t
1 3 .
1 4 .
1 5 .
t o .
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