Acura TSX / Honda Accord CL. Manual - part 555

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Digital Multimeter KS-AHM-32-003 (1) or a commercially available digital multimeter  

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Backprobe Set 07SAZ-001000A (2)  

1. Connect the backprobe adapters (A) to the stacking patch cords (B), and connect the cords to a digital 

multimeter. 

Fig. 6: Connecting The Backprobe Adapters To The Stacking Patch Cords & The Cords To A 
Digital Multimeter 

2. Using the wire insulation as a guide for the contoured tip of the backprobe adapter, gently slide the tip 

into the connector from the wire side until it touches the end of the wire terminal.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

3. If you cannot get to the wire side of the connector or the wire side is sealed (A), disconnect the connector 

and probe the terminals (B) from the terminal side. Do not force the probe into the connector.  

Fig. 7: Do Not Force The Probe Into The Connector 

ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING 

Special Tools Required: Honda Interface Module (HIM) EQS05A35570 

Use this procedure when you have to substitute a known-good ECM/PCM in a troubleshooting procedure. 
Update the ECM/PCM only if the ECM/PCM does not have the latest software loaded. 

HOW TO UPDATE THE ECM/PCM 

NOTE:

Do not puncture the insulation on a wire. Punctures can cause poor or 
intermittent electrical connections.

NOTE:

Do not turn the ignition switch OFF while updating the ECM/PCM. If you turn the 
ignition switch OFF before completion, the ECM/PCM can be damaged.

NOTE:

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To ensure the latest program is installed, do an ECM/PCM update 
whenever the ECM/PCM is substituted or replaced.  

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You can not update an ECM/PCM with the program it already has. It will 
only accept a new program.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

1. Turn the ignition switch ON (II). Do not start the engine.  

2. Connect the HDS or the Honda Interface Module (HIM) to the data link connector (DLC) (A) located 

under the driver's side of the dashboard. 

Fig. 8: Connecting The HDS Or HIM To The Data Link Connector (DLC) Located Under The 
Driver's Side Of The Dashboard 

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Before you update the ECM/PCM, make sure the vehicle's battery is fully 
charged.  

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To prevent ECM/PCM damage, do not operate anything electrical (audio 
system, brakes, A/C, power windows, moonroof, door locks, etc.) during 
the update.  

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If you need to diagnose the Honda Interface Module (HIM) because the 
HIM's red (#3) light came on or was flashing during the update, leave the 
ignition switch in the ON (II) position when you disconnect the HIM from 
the data link connector (DLC). This will prevent ECM/PCM damage.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

  

 

3. Do the ECM/PCM update procedure as described on the HIM label and in the ECM/PCM update system. 

4. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).  

5. Do the CKP pattern learn procedure, if you did the troubleshooting for DTC P0300, P0301, P0302, 

P0303, P0304, P0335 or P0339.  

HOW TO SUBSTITUTE THE ECM/PCM 

1. Remove the ECM/PCM form the vehicle.  

2. Install a known-good ECM/PCM.  

3. Rewrite the immobilizer code with the ECM/PCM replacement procedure in the HDS; it allows you to 

start the engine.  

4. After completing your tests, install the original ECM/PCM and rewrite the immobilizer code with the 

ECM/PCM replacement procedure in the HDS.  

OBD STATUS 

The OBD status shows the current system status of each DTC and all of the parameters. This function is used to 
see if the technician's repair was successfully finished. The results of diagnostic tests for the DTC are displayed 
as:  

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PASSED: On board diagnosis is successfully finished.  

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FAILED: On board diagnosis has finished but failed.  

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EXECUTING: The vehicle is in enable criteria conditions for the DTC and the on board diagnosis is 
running.  

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NOT COMPLETED: The on board diagnosis was running but is out of the enable conditions of the 
DTC.  

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OUT of COND: The vehicle has stayed out of the enable conditions of the DTC.  

DTC TROUBLESHOOTING INDEX

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX