DTC Troubleshooting: U0073 (126), U0155 (126)

DTC U0073:  FCAN Malfunction (Bus-Off)
  
  


1.Turn the ignition switch ON (II).

2.Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or the HDS.

3.Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.

Is DTC U0073 and/or U0155 indicated?


YES - Go to 4.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the gauge control modure, VSA control unit, the navigation unit and the  ECM/PCM.n


4.Check for DTCs in the DTCs MENU in the Body Electrical system with the Honda PGM Tester or the HDS.

Is DTC B1168, B1169 and/or B1178 indicated?


YES - Go to 5.


NO - Perform the gauge control module input test.n


5.Turn the ignition switch OFF.

6.Remove the gauge control module.

7.Disconnect the gauge control module 30P connector.

8.Disconnect the VSA control unit 47P connector.

9.If equipped with the Honda navigation system, disconnect the navigation unit 20P connector.

10.Jump the SCS line with the Honda PGM Tester or HDS.

11.Disconnect ECM/PCM connector E (31P).

12.Check for continuity between ECM/PCM connector terminals E11, E24 and body ground individually.

Is there continuity?


YES - Repair short in the wire between the gauge control module, VSA control unit, the navigation unit and the ECM/PCM (E11 (E24)*), then go to 18.


NO - Go to 13.
*: CANL line


13.Check for continuity between ECM/PCM connector terminals E11 and E24.

Is there continuity?


YES - Repair short in the wire between the ECM/PCM E11 (CANH line) and E24 (CANL line), then go to 18.


NO - Go to 14.

14.Check for continuity between ECM/PCM connector terminal E11 and the following connector terminals:

Connector Terminal 
Gauge control module 30P No. 24 (WHT) 
VSA control unit 47P No. 14 (WHT) 
Navigation unit 20P No.8 (WHT) 


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


YES - Go to 15.


NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to 18.


15.Check for continuity between ECM/PCM connector terminal E24 and the following connector terminals:

Connector Terminal 
Gauge control module 30P No. 23 (RED) 
VSA control unit 47P No. 30 (RED) 
Navigation unit 20P No.18 (RED) 


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


YES - Go to 16.


NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to 18.


16.Refer to the following chart. Select the row that most closely represents the combination of DTCs retrieved from the PGM-FI, VSA, and Body Electrical systems: Check connections at the control module indicated in the last column. If all connections are OK, then substitute the control module. After substitute the control module, go to 18 and recheck.

PGM-FI ABS/TCS Body
Electrical 		Control
module 
U0155 86-1 B1168
B1169
B1178 		Gauge
Control
Module 
U0073
U0121
U0155 		68-1
86-1 		B1168
B1169
B1178 		ECM/PCM 
U0073
U0121
U0155 		68-1
86-1 		B1168
B1178 		VSA
control unit 


Are the DTCs still indicated?


YES - Substitute the remaining control module's one at time until the DTCs are no longer present then replace that control module. After replacing the control module that is faulty, go to 18.


NO - Replace the faulty control module, then go to 18.


17.Reconnect all the connectors.

18.Turn the ignition switch ON (ll).

19.Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS.

20.Do the ECM/PCM idle learn procedure.

21.Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC U0073 and/or U0155 is indicated, check for poor connections or loose terminals at the gauge assembly, VSA control unit, the navigation unit and the ECM/PCM, then go to 1. If any other DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Troubleshooting is complete.n