DTC U0599 (35), U1220 (34)

DTC U0599  : DC-DC Converter Serial Communication Receive Error

DTC U1220  : DC-DC Converter Serial Communication Transmit Error

DTC (Electric Powertrain)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode.

   -5. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   U0599 DC-DC Converter Serial Communication Receive Error
   U1220 DC-DC Converter Serial Communication Transmit Error

   Are DTC U0599 and/or U1220 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the DC-DC converter and battery condition monitor module A. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. CAN gateway system DTC check

   -1. Turn the vehicle to the ON mode.

   -2. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC

   DTC (CAN Gateway)

   Are any DTCs indicated?

   YES 

   Go to the troubleshooting for CAN gateway system DTC(s) .

   NO 

   Go to step 3.

3. DTC check

   -1. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0AFA HV Battery System A Voltage Low

   Is DTC P0AFA indicated?

   YES 

   Go to the DTC P0AFA troubleshooting .

   NO 

   Go to step 4.

4. Open wire check (IGB line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Do the 12 volt battery terminal disconnection procedure .

   -3. Remove the service plug .

   -4. Remove the IPU .

   -5. Remove the IPU cover .

   -6. Disconnect the following connector.

   DC-DC converter 4P connector

   -7. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	DC-DC converter 4P connector: disconnected
   Test point 1	IPU 33P connector (male terminals) No. 33:
   Test point 2	DC-DC converter 4P connector (male terminals) No. 2:

   Courtesy of HONDA, U.S.A., INC.

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Go to step 5.

   NO 

   Repair an open in the IGB wire between the IPU 33P connector and the DC-DC converter.

5. Open wire check (F-CAN A_H line, F-CAN A_L line)

   -1. Disconnect the following connector.

   Battery condition monitor module A connector G (24P)

   -2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	DC-DC converter 4P connector: disconnected
   	Battery condition monitor module A connector G (24P): disconnected

   Test point 1	Battery condition monitor module A connector G (24P) No. 12
   Test point 2	DC-DC converter 4P connector (female terminals) No. 1:

   Test point 1	Battery condition monitor module A connector G (24P) No. 24
   Test point 2	DC-DC converter 4P connector (female terminals) No. 3:

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Replace the DC-DC converter .

   NO 

   Repair an open in the F-CAN A_H or the F-CAN A_L wire between battery condition monitor module A and the DC-DC converter.