U144C

U144C-IMPLAUSIBLE HYBRID CONTROL PROCESSOR STATUS DATA RECEIVED - HEV





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

Theory of Operation

The Hybrid Control Processor (HCP) sends information over the CAN Bus circuit to the Powertrain Control Module (PCM).

- When Monitored:
Ignition on.

- Set Condition:
The PCM gets an implausible signal over the CAN circuit from the HCP. The circuit is continuously monitored. One trip fault.





WARNING: On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, select view DTCs.

Is the U144C-Implausible Hybrid Control Processor Status Data Received active at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test.

2. U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT IS ACTIVE
1. Continue reading DTCs.

Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE at this time?

Yes

- U0001 Perform the U0001-No Communication on the CAN C BUS Circuit diagnostic procedure.

No

- Go To 3

3. HCP MODULE IS ACTIVE ON THE CAN BUS
1. With the scan tool, select ECU View.
2. Verify that the HCP active on the bus.

Is the HCP Active on the bus?

Yes

- Go To 4

No

- Replace the Hybrid Control Processor if other modules are reporting Loss of Communication DTCs against the HCP. If the Hybrid Gateway Module (HGM) is the only module reporting DTCs against the HCP, check the BUS Communication lines between the two modules for opens or shorts.
- Perform the TPIM VERIFICATION TEST.

4. ACTIVE DTCS
1. With the scan tool, select ECU.
2. With the scan tool, view Active DTCs.

Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE at this time?

Yes

- Replace the Hybrid Control Processor (HCP).
- Perform the TPIM VERIFICATION TEST.

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.