P1E1E

DTC P1E1B-P1E1F

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 P1E1B
- Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensing Performance

DTC P1E1C
- Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage

DTC P1E1D
- Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 High Voltage

DTC P1E1E
- Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage

DTC P1E1F
- Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 High Voltage

Circuit/System Description

The power inverter module, also called the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Two of the motor control modules operate their respective drive motor generator based upon power inverter module commands. The third motor control module controls the auxiliary transmission fluid pump motor. The motor control modules and the hybrid powertrain control module are part of the power inverter module and are not serviced separately.

Each motor control module measures hybrid battery high voltage with several internal sensors. The motor control modules test for loss of isolation between either the high voltage positive circuit or high voltage negative circuit and vehicle chassis. The motor control modules test for isolation when the high voltage contactor relays are closed. The hybrid powertrain control module 2 only tests the hybrid battery assembly for high voltage loss of isolation when the high voltage contactor relays are open.

Motor control module loss of isolation is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the high voltage positive and high voltage negative circuits. The center connection of the two resistors is also connected to vehicle chassis. The motor control module then measures the voltage drop across one of the resistors. Without a loss of isolation, the motor control module should measure about half of the high voltage potential. This is referred to as mid-pack voltage. The mid-pack voltage value is then doubled by the software and displayed on a scan tool as Motor 1 Isolation Voltage, Motor 2 Isolation Voltage, or Auxiliary Transmission Fluid Pump Isolation Voltage. When a loss of isolation is present, the motor isolation voltage display will indicate voltage that is more or less than actual hybrid battery high voltage. The motor control module monitors the loss of isolation voltage measuring circuitry for correct operation.

Conditions for Running the DTC

1. The vehicle is ON.
2. The system voltage is at least 9 V.

Conditions for Setting the DTC

P1E1B

The motor control module detects a correlation difference between the mid pack isolation sensor and overall pack voltage.

P1E1C and P1E1E

The motor control module detects isolation sensor voltage less than 20 V.

P1E1D and P1E1F

The motor control module detects isolation sensor voltage greater than 40 V.

Action Taken When the DTC Sets

DTCs P1E1B, P1E15C, P1E1D, P1E1E, and P1E1F are Type C DTCs.

Conditions for Clearing the DTC

DTCs P1E1B, P1E15C, P1E1D, P1E1E, and P1E1F are Type C DTCs.

Reference Information
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

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

Program the T6 power inverter module. If the DTC resets, replace the T6 power inverter module.

Repair Instructions

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

Control Module References Programming and Relearning for Drive Motor Generator Power Inverter Module, also called the power inverter module, replacement, programming, and setup.