B1516

DTC B1516

Diagnostic Instructions

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

DTC Descriptors

DTC B1516 08
- Battery Current Sensor Performance Signal Invalid

DTC B1516 66
- Battery Current Sensor Performance Wrong Mounting Position

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) supplies 5 volts and ground to the battery current sensor. The battery current sensor measures the amount of current flowing to or from the battery, and supplies a pulse width modulation (PWM) signal to the BCM.

Conditions for Running the DTC

* Ignition ON.
* The engine is running.

Conditions for Setting the DTC

The BCM detects a duty cycle of PWM input signal is less than 4 percent or greater than 96 percent for 33 seconds.

Action Taken When the DTC Sets

The charge indicator illuminates on the instrument panel cluster (IPC).

Conditions for Clearing the DTC

* The DTC clears as current status when the battery sensed current returns to normal range for 5 seconds.
* A history DTC will clear after 100 ignition cycles.

Circuit/System Testing

1. Verify that the current sensor is mounted correctly on the battery cable. Refer to Battery Negative Cable Replacement (LZ9) Battery Negative Cable Replacement (LY7) Battery Negative Cable Replacement (LZ4) Battery Negative Cable Replacement (LE5).
2. Ignition ON, disconnect the battery current sensor. Measure the voltage of the current sensor 5 volt reference circuit terminal A. Verify that the 5-volt reference circuit measures 5 volts.

• If the voltage is less than 5 volts, test the current sensor 5-volt reference circuit for a short to ground, a high resistance, or an open circuit. If the circuit tests normal, replace the BCM.

3. Measure the voltage of the between the current sensor 5-volt reference circuit terminal A and the low reference circuit terminal B. Verify that there is 5 volts between the supply voltage circuit and the low reference circuit.

• If the voltage is less than 5 volts, test the current sensor low reference circuit for a high resistance, or an open circuit. If the circuit tests normal, replace the BCM.

4. Measure the voltage of the current sensor signal circuit terminal C. Verify that the signal circuit measures 4-6 volts.

• If the signal circuit voltage is less than 4 volts, test the current sensor signal circuit for a short to ground, a high resistance, or an open circuit. If the circuit tests normal, replace the BCM.
• If the signal circuit voltage is greater than 6 volts, test the current sensor signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.

5. If all 3 circuits test normal, replace the battery current sensor.

Repair Instructions

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

* Battery Negative Cable Replacement (LZ9) Battery Negative Cable Replacement (LY7) Battery Negative Cable Replacement (LZ4) Battery Negative Cable Replacement (LE5)