P1AA0

DTC P1A9C, P1A9D, P1AA0, or P1AA1

Diagnostic Instructions

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

DTC Descriptors
DTC P1A9C
- Starter/Generator Inverter Phase U Temperature Sensor Circuit Low Voltage

DTC P1A9D
- Starter/Generator Inverter Phase U Temperature Sensor Circuit High Voltage

DTC P1AA0
- Starter/Generator Inverter Phase V Temperature Sensor Circuit Low Voltage

DTC P1AA1
- Starter/Generator Inverter Phase V Temperature Sensor Circuit High Voltage

Circuit/System Description

The power inverter module (PIM) temperature 1 and 2 sensors are used for overheat protection. The thermistors are located on the control board, near the phase U or V power MOSFET. The starter/generator control module (SGCM) monitors the inverter temperature sensor for the following:

* To detect if the inverter phase U or V temperature sensor is shorted.
* To detect if the inverter phase U or V temperature sensor is open.

If one of the above conditions is detected, the SGCM will set the appropriate DTC.

Conditions for Running the DTC

P1A9C, P1A9D, P1AA0, P1AA1

The engine is running.

Conditions for Setting the DTC

P1A9C, P1AA0

Sensor output voltage is less than 0.2 volt for 1 second.

P1A9D, P1AA1

Sensor output voltage is greater than 4.6 volts for 1 second.

Action Taken When the DTC Sets

P1A9C, P1A9D, P1AA0, P1AA1

50 percent maximum torque limit.

Conditions for Clearing the DTC

P1A9C, P1A9D, P1AA0, P1AA1

Normal range for 10 seconds.

Diagnostic Aids

P1A9C, P1AA0

Possible temperature sensor short to ground.

P1A9D, P1AA1

Possible temperature sensor short to voltage or open.

Reference Information
Schematic Reference

Hybrid Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Starter/Generator Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

Warning

To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.

1. With a scan tool, clear the DTC.
2. Ignition OFF, wait 30 seconds.
3. Ignition ON, operate the vehicle within the Conditions for Running the DTC.

• If the DTC resets, replace the SGCM.

Repair Instructions

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

Control Module References (Programming and Relearning)for SGCM replacement, setup, and programming