Acura RL. Manual - part 701

Fig. 118: Checking Continuity Between PCM Connector Terminals E15 And E26 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wires between the PCM E15 (CANH line) and E26 (CANL line), then go to 
step 21. 

NO - Go to step 18. 

18. Check for continuity between PCM connector terminal El 5 and these connector terminals: 

CONNECTOR TERMINAL REFERENCE 

Is there continuity between the PCM terminal and each of the terminals in the chart?  

YES - Go to step 19. 

NO - Repair open in the wire between the PCM (E15) and the appropriate connector, then go to step 
21. 

19. Check for continuity between PCM connector terminal E26 and these connector terminals: 

CONNECTOR TERMINAL REFERENCE 

Is there continuity between the PCM terminal and each of the terminals in the chart?  

YES - Go to step 20. 

NO - Repair open in the wire between the PCM (E26) and the appropriate connector, then go to step 
21. 

Connector

Terminal

Gauge control module 28P

No. 16 (WHT)

VSA modulator-control unit 47P

No. 14 (WHT)

SH-AWD control unit 26P

No. 11 (WHT)

Navigation unit 20P

No. 8 (WHT)

Adaptive cruise control (ACC) unit 20P No. 10 (WHT)
TPMS control unit 20P

No. 19 (WHT)

E-pretensioner unit 14P

No. 3 (WHT)

Connector

Terminal

Gauge control module 28P

No. 15(BLK)

VSA modulator-control unit 47P

No. 30 (BLK)

SH-AWD control unit 26P

No. 10(BLK)

Navigation unit 20P

No. 18 (BLK)

Adaptive cruise control (ACC) unit 20P No. 20 (BLK)
TPMS control unit 20P

No. 10 (BLK)

E-pretensioner unit 14P

No. 5 (BLK)

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

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20. Referring to the following chart. Select the row that most closely represents the combination of DTCs 

retrieved from the PGM-FI, VSA, TPMS, adaptive cruise control (ACC), and body electrical systems. 
Then check the connections at the control module indicated in the last column. If all the connections 
are OK, substitute the control module. After substituting the control module, check for DTCs with the 
HDS. 

CONTROL MODULE REFERENCE 

Are the DTCs still indicated?  

YES - Substitute the remaining control modules, one at time, until the DTCs are no longer present, 
then replace the control module that made the DTCs go away. After replacing the faulty control 
module, go to step 21. 

NO - Replace the faulty control module, then go to step 21. 

21. Reconnect all connectors.  

22. Turn the ignition switch ON (II).  

23. Reset the PCM with the HDS.  

24. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).  

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

Is DTC U0073 and/or U0155 indicated?  

YES - If DTC U0073 and/or U0155 is indicated, check for poor connections or loose terminals at the 
gauge control module, the VSA modulator-control unit, the SH-AWD control unit, the navigation 
unit, the adaptive cruise control (ACC) unit, the TPMS control unit, the E-pretensioner unit, and the 

PGM-FI VSA SH-AWD Body Electrical ACC

Control module

U0155

86

41 
77

B1168 
B1169 
B1178

113

Gauge 

Control 

Module

U0073 
U0114 
U0122 
U0155

83 
86

41 
77

B1168 
B1169 
B1178

110
111

PCM

U0073 
U0114 
U0122 
U0155

83 
86

41 
77

B1168 
B1170 
B1178

112

VSA-modulator control unit

U0073 
U0114 
U0122 
U0155

83 
86

41 
77

B1168 
B1169

115

SH-AWD control unit

U0073 
U0104 
U0155

83 
86

--

B1171 
B1178

110
111
112
113
115

Adaptive cruise control (ACC) unit

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

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PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated 
DTCs troubleshooting. 

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the 
indicated DTCs troubleshooting 

DTC U0104: F-CAN MALFUNCTION (ADAPTIVE CRUISE CONTROL (ACC) UNIT-PCM) 

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS.  

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

Is DTC U0104 indicated?  

YES - Go to step 4. 

NO - Intermittent failure, the system is OK at this time.. Check for poor connections or loose 
terminals at the gauge control module, the adaptive cruise control (ACC) unit, and the PCM 

4. Check for a DTC in the DTCs MENU with the HDS. 

Is ACC DTC 110 or 111 indicated?  

YES - Go to step 5. 

NO - Go to step 8. 

5. Turn the ignition switch OFF.  

6. Disconnect the adaptive cruise control (ACC) unit 20P connector.  

7. Check for continuity between adaptive cruise control (ACC) unit 20P connector terminals No. 10 and 

No. 20. 

NOTE:



Before you troubleshoot, record all freeze data and any on-board 
snapshot, and review the general troubleshooting information (see 
GENERAL TROUBLESHOOTING INFORMATION ).  



If DTC U0073 is stored at the same time as DTC U0104, troubleshoot 
DTC U0073 first, then recheck for DTC U0104.  

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

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Page 148  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 119: Checking Continuity Between Adaptive Cruise Control (ACC) Unit 20P Connector 
Terminals 10 And 20 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Substitute a known-good adaptive cruise control (ACC) unit, then go to step 15 and recheck. If 
DTC U0104 is not indicated, replace the original adaptive cruise control (ACC) unit, then go to step 
15. 

NO - Repair open in the wire between the adaptive cruise control (ACC) unit (No. 10 (No. 20)) and 
the PCM (E15 (E26)), then go to step 15. 

8. Check for a poor connection at the adaptive cruise control (ACC) unit 20P connector. 

Is the connection OK?  

YES - Go to step 9. 

NO - Repair the poor connection at the adaptive cruise control (ACC) unit 20P connector, then go to 
step 16. 

9. Turn the ignition switch OFF.  

10. If not already done, disconnect the adaptive cruise control (ACC) unit 20P connector.  

11. Turn the ignition switch ON (II).  

12. Measure voltage between adaptive cruise control (ACC) unit 20P connector terminal No. 2 and body 

ground. 

Fig. 120: Measuring Voltage Between Adaptive Cruise Control (ACC) Unit 20P Connector 
Terminal 2 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Go to step 13. 

NO - Check the No. 29 (10A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair 
open in the wire between the No. 29 (10A) fuse and the adaptive cruise control (ACC) unit, then go to 
step 15. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

me 

 

Friday, June 05, 2009 2:34:59 PM

Page 149  © 2005 Mitchell Repair Information Company, LLC.