*02
HDS Clear Command
Scan Tool Clear Command
DTC Clear
PCM Reset
Crank (CKP) Pattern Clear/Crank (CKP)
Pattern Learn
Clear/Learn Procedure (with the HDS)
11-4
Fuel and Emissions Systems
General Troubleshooting Information (cont’d)
A
The 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. 8 FI ECU
(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, PCM reset, and crank
(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 PCM reset command erases all stored DTC codes,
freeze data, on-board snapshot, readiness codes, and
all specific data to correct the system except crank
(CKP) pattern. If the crank (CKP) pattern data in the PCM
was cleared, you must do the crank (CKP) pattern learn
procedure. The crank (CKP) pattern clear command
erases only crank (CKP) pattern data. This command is
for repair of a misfire or the CKP sensor.
If you are using a generic scan tool to clear commands,
be aware that there is only one setting for clearing the
PCM, and it clears all commands at the same time
(crank (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: PCM idle learn procedure
(see page 11-273); crank (CKP) pattern learn procedure;
test-drive to set readiness codes to complete (see page
11-54).
1. Clear the DTC with the HDS while the engine is
stopped.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II), and wait
30 seconds.
4. Turn the ignition switch OFF, and disconnect the
HDS from the DLC.
1. Reset the PCM with the HDS while the engine is
stopped.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II), and wait
30 seconds.
4. Turn the ignition switch OFF, and disconnect the
HDS from the DLC.
5. Do the PCM idle learn procedure (see page 11-273).
1. Connect the HDS to the data link connector (DLC)
(A) located under the driver’s side of the dashboard.
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the PCM. If
it doesn’t, go to the DLC circuit troubleshooting
(see page 11-194).
4. Select CRANK PATTERN in the ADJUSTMENT
MENU with the HDS.
5. Select CRANK PATTERN LEARNING with the HDS,
and follow the screen prompts.