DTC U1205, U1206, U12A5, U12AA, U12B4 (PGM-FI System)

DTC U1205  : EP-CAN Malfunction (PCM-Motor Control Module)

DTC U1206  : EP-CAN Malfunction (PCM-Battery Condition Monitor Module)

DTC U12A5  : EP-CAN Malfunction (PCM-Motor Control Module)

DTC U12AA  : EP-CAN Malfunction (PCM-SBW Shifter)

DTC U12B4  : EP-CAN Malfunction (PCM-Park Pawl Actuator Driver Unit)

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• If the power system indicator flashes, go to the electric powertrain system general troubleshooting information .
• According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the PCM.

DTC (PGM-FI)

1. 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

   Are any DTCs indicated?

   YES 

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

   NO 

   Go to step 2.

2. F-CAN circuit communication check (Receiving control unit)

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   Which result is indicated?

   Bus E is Not Available

   Go to step 3.

   Bus E is Available

   Go to step 4.

3. Open wire check (EP-CAN A_H line, EP-CAN A_L line)

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

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. Disconnect the following connectors.

   CAN gateway 16P connector

   PCM connector A (50P)

   -4. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 16:
   Test point 2	PCM connector A (50P) No. 21

   Test point 1	CAN gateway 16P connector (female terminals) No. 8:
   Test point 2	PCM connector A (50P) No. 20

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

   Is there 1.0 Ω or less?

   YES 

   The EP-CAN A_H wire and the EP-CAN A_L wire are OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

   NO 

   Repair an open in the EP-CAN A_H wire or the EP-CAN A_L wire between the PCM (A20, A21) and the CAN gateway.

4. Open wire check (EP-CAN A_H line, EP-CAN A_L line)

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

   -2. Disconnect the receiving control unit connector(s).

   NOTE:  Jump the SCS line with the HDS, and wait more than 1 minute when disconnecting the PCM connector(s).

   PCM connector A (50P)

   -3. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

   NOTE:  Before disconnecting the PCU connector and/or the battery condition monitor module connector, do the 12 volt battery terminal disconnection procedure , and turn off the service plug .

   DTC	Connector
   -	CAN gateway 16P connector
   U1205	PCU 33P connector
   U1206	Battery condition monitor module connector E (32P)
   U12A5	PCU 33P connector
   U12AA	SBW shifter control module 20P connector
   U12B4	Park pawl actuator driver unit 26P connector

   -4. Measure the resistance between the receiving control unit and the transmitting control unit on the EP-CAN A_H circuit and the EP-CAN A_L circuit.

   Test condition	Vehicle OFF (LOCK) mode
   	Receiving control unit connector(s): disconnected
   	Transmitting control unit connector(s) for indicated DTCs: disconnected

   DTC	Circuit name	Receiving control unit		Transmitting control unit
   		Connector	Terminal	Connector	Terminal
   U1205	EP-CAN A_H	CAN gateway 16P connector (female terminals):	No. 16	PCU 33P connector	No. 27
   	EP-CAN A_L		No. 8		No. 28
   U1206	EP-CAN A_H	CAN gateway 16P connector (female terminals):	No. 16	Battery condition monitor module connector E (32P)	No. 11
   	EP-CAN A_L		No. 8		No. 10
   U12A5	EP-CAN A_H	CAN gateway 16P connector (female terminals):	No. 16	PCU 33P connector	No. 27
   	EP-CAN A_L		No. 8		No. 28

   DTC	Circuit name	Receiving control unit		Transmitting control unit
   		Connector	Terminal	Connector	Terminal
   U12AA	EP-CAN A_H	CAN gateway 16P connector (female terminals):	No. 16	SBW shifter control module 20P connector	No. 9
   	EP-CAN A_L		No. 8		No. 10
   U12B4	EP-CAN A_H	CAN gateway 16P connector (female terminals):	No. 16	Park pawl actuator driver unit 26P connector	No. 8
   	EP-CAN A_L		No. 8		No. 7

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

   Is there 1.0 Ω or less?

   YES 

   The EP-CAN A_H wire and the EP-CAN A_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. According to the detected DTC on the following table, substitute or replace the correspond control unit.

   DTC	Operation for transmitting control unit
   U1205	Check for poor connections or loose terminals at the CAN gateway and the PCU. Substitute a known-good PCU .
   U1206	Check for poor connections or loose terminals at the CAN gateway and the battery condition monitor module. Substitute a known-good battery condition monitor module .
   U12A5	Check for poor connections or loose terminals at the CAN gateway and the PCU. Substitute a known-good PCU .
   U12AA	Check for poor connections or loose terminals at the CAN gateway and the SBW shifter control module. Substitute a known-good SBW shifter control module .
   U12B4	Check for poor connections or loose terminals at the CAN gateway and the park pawl actuator driver unit. Substitute a known-good park pawl actuator driver unit .

   NO 

   Repair an open in the EP-CAN A_H wire and/or the EP-CAN A_L wire between the receiving control unit and the transmitting control unit.