Acura RL. Manual - part 707

YES - Go to step 18. 

NO - Go to step 22. 

18. Turn the ignition switch OFF.  

19. Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).  

20. Turn the ignition switch ON (II), and read the HDS. 

Does the HDS communicate with the PCM?  

YES - Go to step 21. 

NO - Go to "DLC CIRCUIT TROUBLESHOOTING" 

21. Check for Temporary DTCs or DTCs with the HDS. 

Is DTC U0073 and/or U0155 indicated?  

YES - Go to the indicated DTCs troubleshooting 

NO - Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or 
substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the 
symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM 
REPLACEMENT ) 

22. Turn the ignition switch OFF.  

23. Inspect the No. 23 +B IG MAIN (50A) fuse in the under-hood fuse/relay box. 

Is the fuse OK?  

YES - Repair open in the wire between the No. 23 +B IG MAIN (50A) fuse and the ignition switch. If 
the wire is OK, go to step 24. 

NO - Repair short in the wire between the No. 23 +B IG MAIN (50A) fuse and the under-hood 
fuse/relay box. Also replace the No. 23 +B IG MAIN (50A) fuse 

24. Inspect the No. 8 Fl ECU (PCM) (15A) fuse in the under-hood fuse/relay box. 

Is the fuse OK?  

YES - Go to step 31. 

NO - Go to step 25. 

25. Remove the blown No. 8 Fl ECU (PCM) (15A) fuse from the under-hood fuse/relay box.  

26. Remove the left kick panel (see step 3 under TRIM REMOVAL/INSTALLATION - DOOR 

AREAS ), then remove PGM-FI main relay 1 (Fl MAIN) (A) from the driver's under-dash fuse/relay 
box. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

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Fig. 150: Identifying PGM-FI Main Relay 1 (Fl MAIN) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

27. Check for continuity between body ground and PGM-FI main relay 1 (Fl MAIN) 4P connector 

terminals No. 1 and No. 3 individually. 

Fig. 151: Checking Continuity Between Body Ground And PGM-FI Main Relay 1 (FL MAIN) 
4P Connector Terminals 1 And 3 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between the No. 8 Fl ECU (PCM) (15A) fuse and PGM-FI main relay 
1 (Fl MAIN). Also replace the No. 8 Fl ECU (PCM) (15A) fuse 

NO - Go to step 28. 

28. Disconnect each of the components or connectors below, one at a time, while checking for continuity 

between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 2 and body ground. 



PGM-FI main relay 2 (FUEL PUMP)  



PCM connector A (31P)  



Each injector 2P connector  



Camshaft position (CMP) sensor 3P connector  



Crankshaft position (CKP) sensor A/B 6P connector 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

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

A/F sensor relay (LAF) 4P connector  



Radiator fan control (RFC) relay 4P connector 

Fig. 152: Checking Continuity Between PGM-FI Main Relay 1 (Fl Main) 4P Connector 
Terminal 2 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Does continuity go away when one of the above components is disconnected?  

YES - Replace the component that made the short to body ground go away when disconnected. If the 
item is the PCM, update the PCM if it does not have the latest software (see UPDATING THE 
PCM ), or substitute a known-good PCM (see HOW TO TROUBLESHOOT CIRCUITS AT THE 
PCM CONNECTORS ), then recheck. If the symptom/indication goes away with a known-good 
PCM, replace the original PCM (see PCM REPLACEMENT ). Also replace the No. 8 Fl ECU 
(PCM) (15A) fuse 

NO - Go to step 29. 

29. Disconnect the connectors from these components: 



PGM-FI main relay 2 (FUEL PUMP)  



PCM connector A (31P)  



Injectors  



Camshaft position (CMP) sensor  



Crankshaft position (CKP) sensor A/B  



A/F sensor relay (LAF)  



Radiator fan control (RFC) relay  

30. Check for continuity between PGM-FI main relay 1 (Fl MAIN) 4P connector terminal No. 2 and body 

ground. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

me 

 

Friday, June 05, 2009 2:35:00 PM

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Fig. 153: Checking Continuity Between PGM-FI Main Relay 1 (Fl Main) 4P Connector 
Terminal 2 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between PGM-FI main relay 1 (Fl MAIN) and each item. Also replace 
the No. 8 Fl ECU (PCM) (15A) fuse 

NO - Replace PGM-FI main relay 1 (Fl MAIN). Also replace the No. 8 Fl ECU (PCM) (15A) fuse 

31. Turn the ignition switch ON (II).  

32. Measure voltage between PCM connector terminal D6 and body ground. 

Fig. 154: Measuring Voltage Between PCM Connector Terminal D6 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Go to step 33. 

NO - Repair open in the wire between the No. 19 FUEL PUMP (20A) fuse and the PCM (D6) 

33. Measure voltage between PCM connector terminal E5 and body ground. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

me 

 

Friday, June 05, 2009 2:35:00 PM

Page 173  © 2005 Mitchell Repair Information Company, LLC.