Acura TSX / Honda Accord CL. Manual - part 593

YES: Troubleshooting is complete.  

NO: If the screen indicates FAILED, check for poor connections or loose terminals at the 
A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT 
COMPLETED, go to step 24 and recheck.  

27. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see 

HOW TO SUBSTITUTE THE ECM/PCM ).  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0135 is indicated, check for poor connections or loose terminals at the A/F 
sensor (Sensor 1), and the A/F sensor relay and the ECM/PCM, then go to step 1 . If any 
other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.  

NO: If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was 
substituted, replace the original ECM/PCM (see HOW TO REMOVE THE ECM/PCM 
FOR TESTING ).  

DTC P1157: A/F SENSOR (SENSOR 1) AFS LINE HIGH VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS.  

3. Start the engine.  

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

Is DTC P1157 indicated? 

YES: Go to step 5.  

NO: Intermittent failure, system is OK at this time. Check for poor connections or loose 
terminals at the A/F sensor (Sensor 1) and the ECM/PCM.  

5. Turn the ignition switch OFF.  

6. Jump the SCS line with the HDS.  

7. Disconnect the A/F sensor (Sensor 1) 4P connector.  

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

9. Connect A/F sensor (Sensor 1) 4P connector terminals No. 1 and No. 2 with a jumper wire. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 27: Connecting A/F Sensor (Sensor 1) 4P Connector Terminals No. 1 & No. 2 With A Jumper 
Wire 

10. Check for continuity between ECM/PCM connector terminals A28 and A31. 

Is there continuity? 

YES: Go to step 14 .  

NO: Go to step 11.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 28: Checking For Continuity Between ECM/PCM Connector Terminals A28 & A31 

11. Remove the jumper wire from the A/F sensor (Sensor 1) 4P connector.  

12. Connect A/F sensor (Sensor 1) 4P connector terminal No. 2 to body ground with a jumper wire. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 29: Connecting A/F Sensor (Sensor 1) 4P Connector Terminal No. 2 To Body Ground With A 
Jumper Wire 

13. Check for continuity between ECM/PCM connector terminal A31 and body ground. 

Is there continuity? 

YES: Repair open in the wire between the ECM/PCM (A28) and the A/F sensor (Sensor 1), 
then go to step 15 .  

NO: Repair open in the wire between the ECM/PCM (A31) and the A/F sensor (Sensor 1), 
then go to step 15 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX