Acura TSX / Honda Accord CL. Manual - part 624

Fig. 120: Measuring Voltage Between PGM-FI Main Relay 1 4P Connector Terminal No. 2 & 
Body Ground 

60. Turn the ignition switch OFF.  

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

ECM/PCM connector terminals A2 and A3 individually. 

Is there continuity? 

YES: Replace PGM-FI main relay 1 (FI MAIN).  

NO: Repair open in the wire between PGM-FI main relay 1 (FI MAIN) and the ECM/PCM 
(A2, A3).  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 121: Checking For Continuity Between PGM-FI Main Relay 1 (FI MAIN) 4P Connector 
Terminal No. 1 & ECM/PCM Connector Terminals A2 & A3 

62. Measure voltage between body ground and ECM/PCM connector terminals A4, A5, A8 and A9 

individually. 

Is there more than 0.2 V? 

YES: Repair open in the wire(s) that had more than 0.2 V between G101 and the ECM/PCM 
(A4, A5, A8, A9).  

NO: Go to step 63.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 122: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminals A4, 
A5, A8 & A9 

63. Measure voltage between body ground and ECM/PCM connector terminal A21. 

Is there more than 5 V? 

YES: Go to step 71 .  

NO: Go to step 64.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 123: Measuring Voltage Between Body Ground & ECM/PCM Connector Terminal A21 

64. Turn the ignition switch OFF.  

65. Disconnect the connector from each of these sensors, one at a time, and measure voltage between body 

ground and ECM/PCM connector terminal A21 with the ignition switch ON (II): 

z

Manifold absolute pressure (MAP) sensor  

z

Accelerator pedal position (APP) sensor  

z

Mainshaft speed sensor (A/T) 

Is there about 5 V? 

YES: Replace the sensor that restored 5 V when disconnected.  

NO: Go to step 66. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX