DTC Advanced Diagnostics: P0864 (3.0L Engine)

DTC P0864: PF-CAN C Malfunction (Powertrain Control Module (PCM)-Transmission Control Module (TCM))

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 (F-CAN_H and F-CAN_L). When the information is not sent from the transmission control module (TCM) via the F-CAN lines and this condition continues for a specified time or when the information sent from the TCM 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	1.5 seconds or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition	Minimum	Maximum
Elapsed time after the vehicle 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 TCM via the F-CAN lines for at least 1.5 seconds.
The information sent from the TCM unit 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.

PF-CAN circuit PF-CAN C_H line open
PF-CAN circuit PF-CAN C_L line open
PF-CAN circuit PF-CAN C_H line short to ground
PF-CAN circuit PF-CAN C_L line short to ground
PF-CAN circuit PF-CAN C_H line short to power
PF-CAN circuit PF-CAN C_L line short to power
PF-CAN circuit PF-CAN C_H line short to PF-CAN circuit PF-CAN C_L line
TCM failure (include fuse fall-outs)
PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected the MIL comes on and a Pending DTC, Confirmed DTC, the freeze data, and the on-board snapshot 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, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.