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 Descriptors
DTC B1516 08: Battery Current Sensor Performance Signal InvalidDTC B1516 66: Battery Current Sensor Performance Wrong Mounting Position
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5-Volt Reference | B1516 08 | B1516 08 | -- | -- |
Signal | B1516 08 | B1516 08 | B1516 08 | B1516 08, B1516 66 |
Low Reference | -- | B1516 08 | -- | -- |
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. The BCM monitors the battery current signal, and sets DTC B1516 08 if the signal is outside the normal range of 4-96 percent duty cycle. The BCM also monitors the current polarity, and sets DTC B1516 66 if reverse polarity is detected.
Conditions for Running the DTC
B1516 08
The BCM is awake.
B1516 66
| • | The BCM is awake. |
| • | The engine is not running. |
| • | DTC B1516 08 has run and passed. |
| • | DTC B1516 66 has not run and passed. |
Conditions for Setting the DTC
B1516 08
The battery current signal is less than 4 percent or greater than 96 percent duty cycle for 2 minutes.
B1516 66
The battery current polarity is positive for 2 minutes.
Action Taken When the DTC Sets
The regulated voltage control (RVC) is disabled.
Conditions for Clearing the DTC
| • | The DTC passes when the battery current signal returns to the normal range for 2 minutes. |
| • | A history DTC will clear after 100 ignition cycles. |
Diagnostic Aids
DTC B151 66 may set if a battery charger is used.
Reference Information
Schematic Reference
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 Testing
- Verify that the current sensor is mounted correctly on the negative battery cables. The sensor should be installed with the coil around the negative battery cables, with the tape tab pointing away from the battery.
- Ignition OFF, disconnect the battery current sensor.
- Ignition OFF and scan tool disconnected, remove the 30A IBCM 1 fuse 20 from the underhood fuse block, and wait 45 seconds. Test for less than 5 ohms between the low reference circuit terminal B and ground.
- Ignition ON, test for 4.5-5.5 volts on the 5-volt reference circuit terminal A.
- Ignition ON, test for 4.5-5.5 volts on the signal circuit terminal C.
- If all circuits test normal, replace the battery current sensor.
| ⇒ | If greater than the specified value, test the current sensor low reference circuit and the BCM ground circuits for an open/high resistance. If the circuits test normal, replace the BCM. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming. |
