Honda Accord 2008 Manual page 323

07/11/02 08:59:57 61TA0000_110_0004
Fuel and Emissions Systems
General Troubleshooting Information (cont'd)
If the MIL did not stay on
If the MIL did not stay on but there is a driveability
problem, do the symptom troubleshooting.
If you can't duplicate the DTC
Some of the troubleshooting requires you to reset the
ECM/PCM and try to duplicate the DTC. If the problem is
intermittent and you can't duplicate the code, do not
continue through the procedure. To do so will only
result in confusion and possibly, a needlessly replaced
ECM/PCM.
HDS Clear Command
The ECM/PCM stores various specific data to correct the
system even if there is no electrical power such as
when the battery negative terminal or No. 17 FI MAIN
(15 A) fuse are disconnected. Stored data based on
failed parts should be cleared by using the CLEAR
COMMAND of the HDS, if parts are replaced.
The HDS has three kinds of clear commands to meet
this purpose. They are DTC clear, ECM/PCM reset, and
CKP pattern clear. DTC clear command erases all stored
DTC codes, freeze data, on-board snapshot, and
readiness codes. This must be done with the HDS after
reproducing the DTC during troubleshooting.
The ECM/PCM reset command erases all stored DTC
codes, freeze data, on-board snapshot, readiness codes,
and all specific data to correct the system except CKP
pattern. If the CKP pattern data in the ECM/PCM was
cleared, you must do the CKP pattern learn procedure.
The CKP pattern clear command erases only CKP
pattern data. This command is for repair of a misfire or
the CKP sensor.
Scan Tool Clear Command
If you are using a generic scan tool to clear commands,
be aware that there is only one setting for clearing the
ECM/PCM, and it clears all commands at the same time
(CKP pattern learn, idle learn, readiness codes, freeze
data, on-board snapshot, and DTCs). After you clear all
commands, you then need to do these procedures, in
this order: ECM/PCM idle learn procedure (see page
11-343); CKP pattern learn procedure; test-drive to set
readiness codes to complete (see page 11-62).
11-4
DTC Clear
1. Clear the DTC with the HDS while the engine is
stopped.
2. Turn the ignition switch to LOCK (0).
3. Turn the ignition switch to ON (II), and wait
30 seconds.
4. Turn the ignition switch to LOCK (0), and
disconnect the HDS from the DLC.
ECM/PCM Reset
1. Reset the ECM/PCM with the HDS while the engine
is stopped.
2. Turn the ignition switch to LOCK (0).
3. Turn the ignition switch to ON (II), and wait
30 seconds.
4. Turn the ignition switch to LOCK (0), and
disconnect the HDS from the DLC.
5. Do the ECM/PCM idle learn procedure (see page
11-343).