DTC U1603
DTC U1603: F-CAN Malfunction (Powertrain Control Module (PCM)-Battery Condition Monitor Module)
General Description
The controller area network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (H line and L line). When the information is not sent from the battery condition monitor module via the F-CAN lines and this condition continues for a specified time or when the information sent from the battery condition monitor module 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 off |
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
One of these conditions is met:
- The PCM does not receive any signals via the F-CAN lines for at least 1.5 seconds.
- The information sent from the battery condition monitor module is abnormal at least 20 times.
Possible Cause
- F-CAN circuit F-CAN A_H line short to ground
- F-CAN circuit F-CAN A_L line short to ground
- F-CAN circuit F-CAN A_H line open
- F-CAN circuit F-CAN A_L line open
- Battery condition monitor module failure (include fuse fall-outs)
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.