P0516

P0516-BATTERY TEMPERATURE SENSOR CIRCUIT LOW





For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.

Theory of Operation

The ECM monitors the battery temperature to help determine when it is ok too charge the battery. Charging a battery that is too hot or too cold may damage the battery. At key on after a cold soak, the ECM compares the battery temperature reading to the ambient intake air temperature and coolant temperature. The key on monitor is disabled for ambient temperatures below -6.7° C (20° F). The ECM looks for the temperature reading to change over time after the engine is started. This monitor is used to detect a stuck sensor. Both the key-on and engine running portions of this rationality error require that the diagnostic fails in two consecutive drive cycles before the MIL lamp is lit. The ECM turns off the MIL lamp when the diagnostic runs and passes in 4 consecutive drive cycles.

- When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.

- Set Condition:
The circuit voltage to the ECM falls below 0.25 volts for five seconds.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

1. ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 30 seconds.
5. Turn the ignition on.
6. With the scan tool, read DTCs.

Did the DTC reset?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION - DIESEL (Diagnostic Procedure). Intermittent Condition Test

2. BATTERY TEMP SENSOR
1. Ignition on.
2. While monitoring the scan tool, disconnect the Battery Temperature Sensor harness connector.

Did DTC P0517 set?

Yes

- Replace the Battery Temperature Sensor.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

No

- Go To 3

3. (K25) BATTERY TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND




1. Disconnect the ECM C2 harness connector.
2. Check connectors - Clean/repair as necessary.
3. Measure the resistance between the ground and the (K25) Battery Temperature Sensor Signal circuit at the Battery Temperature Sensor connector.

Is the resistance below 10.0 ohms?

Yes

- Repair the short to ground in the (K25) Battery Temperature Sensor Signal circuit.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

No

- Go To 4

4. (K25) BATTERY TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO (K900) BATTERY TEMPERATURE SENSOR RETURN CIRCUIT




1. Measure the resistance between the (K25) Battery Temperature Sensor Signal circuit and the (K900) Battery Temperature Sensor Return circuit at the ECM C2 harness connector.

Is the resistance below 10.0 ohms?

Yes

- Repair the short between the (K25) Battery Temperature Sensor Signal circuit and the (K900) Battery Temperature Sensor Return circuit.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

No

- Replace the ECM.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test