P1A73

DTC P1A71-P1A73

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 P1A71

-
14 Volt Power Module Temperature Sensor 2 Performance

DTC P1A72

-
14 Volt Power Module Temperature Sensor 2 Circuit Low Voltage

DTC P1A73

-
14 Volt Power Module Temperature Sensor 2 Circuit High Voltage

Circuit/System Description

The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module.

The 14V power module constantly monitors its temperature to protect against overheat conditions. The module also monitors the performance of the temperature sensors to assure they are working properly. These sensors are internal to the 14V power module and are not serviced separately from the generator control module.

Conditions for Running the DTC

* The Ignition is ON.

* Ignition voltage is between 9-16V.

P1A71

* DTCs P1A90, P1A91, P1A92, P1A71, P1A72, P1A73, P0A2B, P0A2C, P0A2D, P0A2F, P0AEE, P0AEF, P0AF0, P0C11, and P262B are not set.

* Ignition must be off for 8 hours or more.

Conditions for Setting the DTC

P1A71

14V Power Module Temperature Sensor 2 has a value of 20°C greater than the average value of 14V Power Module Temperature Sensor 1, Motor Generator Unit Temperature, and the Inverter Temperature for greater than 4 seconds.

P1A72

14V Power Module Temperature Sensor 2 is greater than 145°C (293°F) for greater than 4 seconds.

P1A73

14V Power Module Temperature Sensor 2 is less than -65°C (-85°F) for greater than 4 seconds.

Action Taken When the DTC Sets

* DTCs P1A71, P1A72, or P1A73 are Type B DTCs.

* The 14V power module stops supplying power to the 12V system.

* The charging system light will illuminate, and Service Battery Charging System will display on the Driver Information Center.

Conditions for Clearing the DTC

DTCs P1A71, P1A72, or P1A73 are Type B DTCs.

P1A72

14V Power Module Temperature Sensor 2 is less than 140°C (284°F).

P1A73

14V Power Module Temperature Sensor 2 is greater than -60°C (-76°F).

Diagnostic Aids

Verify 14V Power Module Temperature Sensor 2 reads between -59°C (-74°F) and +139°C (+282°F) and is within 20°C (36°F) of the average of 14V Power Module Temperature Sensor 1, Drive Motor Temperature, and 14V Power Module Temperature Sensor 2 after ignition has been off for 8 hours.

Reference Information

Schematic Reference

Hybrid Energy Storage Schematics [1][2]Electrical Diagrams

Description and Operation

* Starter Generator Description and Operation Starter Generator Description and Operation

* Generator Control Module Description and Operation Generator Control Module Description and Operation

* Hybrid Modes of Operation Description Hybrid Modes of Operation Description

DTC Type Reference

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

Circuit/System Verification

If the DTC is set, replace the K59 starter generator control module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Programming and Relearning for Generator Control Module, also called the Starter Generator Control Module, replacement, programming and setup.