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P1EB9




DTC P1EB9

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P1EB9 00
- High Voltage Energy Communication Bus Enable Circuit

Diagnostic Fault Information






Circuit/System Description

The hybrid powertrain control module 2 activates the high voltage energy management communication enable circuit when the vehicle is on. This circuit wakes up the control modules for high voltage energy bus communication.

Conditions for Running the DTC

* The system voltage is between 9-16 V.
* The vehicle power mode master requires serial data communication to occur.

Conditions for Setting the DTC

The hybrid powertrain control module 2 detects a fault in the high voltage energy management communication enable circuit.

Action Taken When the DTC Sets

* DTC P1EB9 is a type A DTC.
* The control modules is never signaled, therefore the specific subsystems will not function.

Conditions for Clearing the DTC

DTC P1EB9 is a type A DTC.

Diagnostic Aids

Short to ground will also set multiple no communication codes for control modules on high voltage energy serial data bus.

Reference Information
Schematic Reference

* Data Communication Schematics [1][2]Electrical Diagrams
* Control Module References Programming and Relearning

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Data Link Communications Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information
Special Tools

EL-48900 - HEV Safety Kit

For equivalent regional tools, refer to Special Tools Tools and Equipment.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.


The High Voltage Disabling procedure will perform the following tasks:


* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.


Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:


* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.


- Visually and functionally inspect the gloves before use.

- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.


Failure to follow the procedures exactly as written may result in serious injury or death.


Note: Use the schematic to identify the following:

* The control modules that share the K114B hybrid powertrain control module 2 terminal 48 X2 high voltage energy management communication enable circuit
* The control module B+, ignition, and high voltage energy management communication enable circuit terminals

1. Vehicle OFF, disconnect the X2 harness connector at the K114B hybrid powertrain control module 2.
2. Vehicle OFF and all vehicle systems OFF, all keys at least 3 meters away from vehicle, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for greater than 100 ohm, but less than infinite resistance, between the high voltage energy management communication enable circuit terminal 48 X2 and ground.

• If less than the specified range, refer to Testing the High Voltage Energy Management Communication Enable Circuits for a Short to Ground.

• If infinite resistance, test the high voltage energy management communication enable circuit for an open/high resistance.

3. Vehicle in Service Mode, verify that a test lamp illuminates between each B+ circuit terminal and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the K114B hybrid powertrain control module 2.

4. Vehicle in Service Mode, verify that a test lamp illuminates between each ignition circuit terminal and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the K114B hybrid powertrain control module 2.

5. If the circuits test normal, replace the K114B hybrid powertrain control module 2.

Testing the High Voltage Energy Management Communication Enable Circuits for a Short to Ground
1. Perform the High Voltage Disabling procedure. Refer to High Voltage Disabling High Voltage Disabling.
2. Reconnect the 12 V battery.
3. Vehicle OFF, disconnect the harness connector at an easily accessible control module that shares the K114B hybrid powertrain control module 2 terminal 48 X2 high voltage energy management communication enable circuit.
4. Test for less than 100 ohm between the K114B hybrid powertrain control module 2 high voltage energy management communication enable circuit terminal 48 X2 and ground.

• If greater than the specified range, replace the control module that was just disconnected.

5. Repeat step 3 until all control modules on the K114B hybrid powertrain control module 2 high voltage energy management communication enable circuit terminal 48 X2 have been disconnected.
6. Repair the short to ground on the high voltage energy management communication enable circuit.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Programming and Relearning for control module replacement, programming and setup.

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