Acura TSX / Honda Accord CL. Manual - part 606

DTC P0325: KNOCK SENSOR CIRCUIT MALFUNCTION

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS.  

3. Start the engine. Hold the engine speed at 3,000 RPM with no load (in Park or neutral) until the radiator 

fan comes on, then let it idle.  

4. Hold the engine at 3,000-4,000 RPM for at least 60 seconds.  

5. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. 

Is DTC P0325 indicated? 

YES: Go to step 6.  

NO: Intermittent failure, system is OK at this time. Check for poor connections or loose 
terminals at the knock sensor and the ECM/PCM.  

6. Turn the ignition switch OFF.  

7. Jump the SCS line with the HDS.  

8. Disconnect the knock sensor 1P connector.  

9. Disconnect ECM/PCM connector A (31P).  

10. Check for continuity between ECM/PCM connector terminal A1 and body ground. 

Is there continuity? 

YES: Repair short in the wire between the ECM/PCM (A1) and the knock sensor, then go to 
step 14 .  

NO: Go to step 11.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 63: Checking For Continuity Between ECM/PCM Connector Terminal A1 & Body 
Ground 

11. Connect the knock sensor 1P connector terminal to body ground with a jumper wire. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 64: Connecting The Knock Sensor 1P Connector Terminal To Body Ground With A Jumper 
Wire 

12. Check for continuity between ECM/PCM connector terminal A1 and body ground. 

Is there continuity? 

YES: Go to step 13.  

NO: Repair open in the wire between the ECM/PCM (A1) and the knock sensor, then go to 
step 14 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 65: Checking For Continuity Between ECM/PCM Connector Terminal A1 & Body 
Ground 

13. Replace the knock sensor (see IAT SENSOR REPLACEMENT ).  

14. Turn the ignition switch ON (II).  

15. Reset the ECM/PCM with the HDS.  

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

17. Hold the engine at 3,000-4,000 RPM for at least 60 seconds.  

18. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. 

Are any Temporary DTCs or DTCs indicated? 

YES: Go to step 20 .  

NO: Go to step 19.  

19. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS. 

Does the screen indicate PASSED? 

YES: Troubleshooting is complete.  

NO: If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates NOT 
COMPLETED, go to step 16 and recheck. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX