DTC U1205 (PGM-FI System)

WARNING: This page is about a different variant/trim than selected.

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

General Description

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

The controller area network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (CAN H and CAN L). When the information is not sent from the power control unit (PCU) via the EP-CAN lines and this condition continues for a specified time or when the information sent from the PCU is abnormal and this condition continues for a specified cycle, the powertrain control module (PCM) detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	200 milliseconds or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition	Minimum	Maximum
Elapsed time after the vehicle condition is turned to the ON mode	3 seconds	-
12 volt battery voltage [Battery]	10.0 V	-

[ ]: HDS Parameter

Malfunction Threshold

Either of the condition is met:

The PCM cannot receive any signals from the PCU via the EP-CAN lines for at least 200 milliseconds.
The information sent from the PCU is abnormal at least 20 times.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

EP-CAN circuit EP-CAN A_H line open
EP-CAN circuit EP-CAN A_L line open
EP-CAN circuit EP-CAN A_H line short to ground
EP-CAN circuit EP-CAN A_L line short to ground
PCU failure (include fuse blown)
PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.