How to End A Troubleshooting Session

HDS Clear Command

The ECM/PCM stores various specific data to correct the system even when there is no electrical power such as the battery negative terminal or No 8 FI ECU (ECM/PCM) (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 command to meet the purpose. They are DTC clear, ECM/PCM clear, and CKP pattern clear DTC clear command erases all stored DTC codes, freeze data and readiness codes. This must be done with the HDS after reproducing the DTC during troubleshooting. ECM/PCM clear command erases all stored DTC codes, freeze data, readiness codes, and all specific data to correct the system except CKP pattern. If the CKP pattern data in 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 the repair of a misfire or CKP sensor.

DTC CLEAR

1. Do the DTC CLEAR in the CLEAR MENU with the HDS while the engine is stopped
2. Turn the ignition switch OFF
3. Turn the ignition switch ON (II). Wait for 30 seconds.
4. Turn the ignition switch OFF, and disconnect the HDS from the DLC

ECM/PCM RESET

This command clears stored specific data from each vehicle such as DTCs freeze data, and readiness codes. It does not clear CKP PATTERN data.

1. Do the ECM/PCM RESET in the CLEAR MENU with the HDS while the engine is stopped.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II). Wait for 30 seconds.
4. Turn the ignition switch OFF, and disconnect the HDS from the DLC.
5. Do the ECM/PCM idle learn procedure.

CKP PATTERN CLEAR/CKP Pattern Learn Procedure

Enable Criteria
ECT at 176 °F (80 °C) or higher.

Procedure
1. Do the CKP PATTERN CLEAR in the CLEAR MENU with the HDS while the engine is stopped.
2. Turn the ignition OFF.
3. Turn the ignition ON (II), and wait for 30 seconds.
4. Test drive the vehicle on a level road Decelerate (with the throttle fully closed) from engine speed of 2,500 rpm to 1,000 rpm with the A/T in 2 position, or the M/T in 2nd or 3rd gear.
5. Stop the vehicle Do not turn the ignition off.
6. Select the ALL DATA LIST in the DATA LIST MENU of the HDS.
7. Check the status of PULSER F/B LEARN. If it is set to NG, the enable criteria was probably not met, repeat the procedure from the beginning.

How to End a Troubleshooting Session (required after any troubleshooting)

1. Do the ECM/PCM RESET in the CLEAR MENU with the HDS.
2. Do the ECM/PCM idle learn procedure.
3. Turn the ignition switch OFF.
4. Disconnect the HDS from the DLC.

NOTE: The ECM/PCM is part of the immobilizer system. If you replace the ECM/PCM, it will have a different immobilizer code. In order for the engine to start, you must rewrite the immobililzer code with the HDS.