Acura TSX / Honda Accord CL. Manual - part 623

Fig. 116: Measuring Voltage Between PGM-FI Main Relay 1 (FI MAIN) 4P Connector 
Terminal No. 3 & Body Ground 

52. Check for continuity between PGM-FI main relay 1 (FI MAIN) 4P connector terminal No. 4 and 

ECM/PCM connector terminal E7. 

Is there continuity? 

YES: Test PGM-FI main relay 1 (FI MAIN) (see RELAYS ). If the relay is OK, update the 
ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, 
then recheck (see HOW TO SUBSTITUTE THE ECM/PCM ). If the symptom/indication 
goes away with a known-good ECM/PCM, replace the original ECM/PCM.  

NO: Repair open in the wire between PGM-FI main relay 1 (FI MAIN) and the ECM/PCM 
(E7).  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 117: Checking For Continuity Between PGM-FI Main Relay 1 (FI MAIN) 4P Connector 
Terminal No. 4 & ECM/PCM Connector Terminal E7 

53. Reconnect ECM/PCM connector E (31P).  

54. Turn the ignition switch ON (II).  

55. Measure voltage between body ground and ECM/PCM connector terminals A2 and A3 individually. 

Is there battery voltage? 

YES: Go to step 62 .  

NO: Go to step 56.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 118: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminals A2 
& A3 

56. Turn the ignition switch OFF.  

57. Remove PGM-FI main relay 1 (FI MAIN) (A). 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 119: Removing PGM-FI Main Relay 1 (FI MAIN) 

58. Turn the ignition switch ON (II).  

59. Measure voltage between PGM-FI main relay 1 4P connector terminal No. 2 and body ground. 

Is there battery voltage? 

YES: Go to step 60.  

NO: Repair open in the wire between the No. 8 FI ECU (ECM/PCM) (15A) fuse and PGM-
FI main relay 1 (FI MAIN). 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX