P0AB9
DTC P0AB9
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 P0AB9
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Hybrid/EV System Performance
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 eAssist hybrid system has the ability to crank and start the engine using two different methods. The first method is a conventional 12 volt system. On every initial start up the conventional 12 volt starter and 12 volt battery are used to crank and start the engine.
The second starting method uses both the 115 Volt generator control and battery assembly, also called the hybrid EV battery pack, and the starter generator, also called the drive motor. The drive motor is a 3 phase AC induction machine. This device not only serves as a 115-volt AC generator, it is also used to provide engine power assist and to start the engine when in auto-stop mode. If the system is in the auto-stop mode and fails to restart with the drive motor, the 12 volt conventional starter will automatically be engaged to start the engine.
The drive motor can quickly rotate the engine to operating speed (800 RPM). The hybrid powertrain control module can detect a condition where the engine is stalling and command the drive motor to rotate the engine to prevent a stall.
Conditions for Running the DTC
Engine Running.
Conditions for Setting the DTC
The hybrid powertrain control module detects that engine speed has fallen below a specific minimum speed indicating the engine has stalled.
Action Taken When the DTC Sets
DTC P0AB9 is a Type C DTC.
Conditions for Clearing the DTC
* DTC P0AB9 is a Type C DTC.
* Engine restarts with key cycle.
Diagnostic Aids
Any condition that causes the engine to stall and/or not start may set this DTC. Possible conditions include:
* Fuel conditions such as low level, low pressure, or contamination.
* Engine conditions such as low compression.
* Restricted exhaust or air intake systems.
Always inspect for DTCs that would cause an engine stall and/or no start condition.
This DTC may set if the vehicle is powered off while driving.
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
Circuit/System Verification
1. Verify that no other DTCs are set.
• If other DTCs are set, diagnose them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Start the engine. The engine should start and run.
• If the engine fails to start, or stalls, diagnose the engine system. Refer to Engine Cranks But Does Not Run Engine Cranks but Does Not Run.
3. If the DTC is set, and the engine is running smoothly, program the K59 starter generator control module.
• If the DTC resets, 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 Starter Generator Control Module, replacement, programming and setup.