Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B1516: Battery Current Sensor Performance - GBCMCircuit/System Description
The generator battery control module (GBCM) monitors its internal battery current sensor for charging system operations, and also for diagnostic purposes. If the values of the internal battery current sensor are out of range, DTC B1516 will set.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The duty cycle of the internal battery current sensor is less than 2 percent duty cycle or greater than 98 percent duty cycle for 4 minutes.
Action Taken When the DTC Sets
| • | The charge indicator turns ON. |
| • | The driver information center (DIC) displays the SERVICE CHARGSYS message. |
| • | The generator field control circuit duty cycle is set to 100 percent. |
| • | The filtered battery current is set to 0.1 amp. |
| • | The battery voltage parameter defaults to 13.8 V. |
Conditions for Clearing the DTC
The duty cycle of the internal battery current sensor is greater than 2 percent duty cycle or less than 98 percent duty cycle.
Reference Information
Schematic Reference
Starting and Charging Schematics
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Replace the GBCM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for GBCM replacement, setup, and programming.
