Acura TSX / Honda Accord CL. Manual - part 554

Fig. 4: Connecting The HDS To The Data Link Connector (DLC) Located Under The Driver's Side 
Of The Dashboard 

3. Turn the ignition switch ON (II).  

4. Check the diagnostic trouble code (DTC) and note it. Also check the freeze data. Refer to the DTC 

Troubleshooting Index and begin the appropriate troubleshooting procedure. 

5. If no DTC are found, go to MIL troubleshooting (see MIL CIRCUIT TROUBLESHOOTING ).  

If the MIL did not stay on 

NOTE:

z

Freeze data indicates the engine conditions when the first 
malfunction, misfire, or fuel trim malfunction was detected.  

z

The HDS can read the DTC, freeze data, current data, and other 
engine control module (ECM)/powertrain control module (PCM) data.  

z

For specific operations, refer to the user's manual that came with the 
HDS.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

If the MIL did not stay on but there is a driveability problem, refer to the Symptom Troubleshooting Index in 
this section. 

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 when there is no electrical power such as 
the battery negative terminal or No. 8 FI ECU (ECM/PCM) (15A) 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 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 in this service manual. 

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 (see ECM/PCM IDLE LEARN PROCEDURE ).  

CKP PATTERN CLEAR/CKP PATTERN LEARN PROCEDURE 

Enable Criteria 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

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 (see ECM/PCM IDLE LEARN PROCEDURE ).  

3. Turn the ignition switch OFF.  

4. Disconnect the HDS from the DLC.  

HOW TO REMOVE THE ECM/PCM FOR TESTING 

If DTC troubleshooting requires voltage or resistance checks at the ECM/PCM connectors, remove the 
ECM/PCM and test it.  

1. Jump the SCS line with the HDS.  

2. Remove the center lower covers (A). 

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 immobilizer code with the HDS.

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

Fig. 5: Removing The ECM/PCM 

3. Remove the duct (B).  

4. Disconnect the ECM/PCM connectors (C).  

5. Remove the bolts (D), then remove the ECM/PCM (E).  

6. Install the ECM/PCM in the reverse order of removal.  

7. Open the SCS line with the HDS.  

HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM 

Special Tools Required:  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX