P0516

P0516-LOW VOLTAGE AT THE BAT TEMP SENSOR

P0516 - Low Voltage At The Bat Temp Sensor:

WHEN MONITORED
With the ignition on and battery voltage greater than 10.4 volts.

SET CONDITION
The circuit voltage to the ECM falls below a calibrated threshold for a certain period of time.

POSSIBLE CAUSES
- Battery temp sensor
- (K25) Signal circuit shorted to ground
- (K25) Signal circuit shorted
- Intermittent condition
- ECM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

1. BATTERY TEMP SENSOR
Turn the ignition off.
Disconnect the Battery temp sensor harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance of the Battery temp sensor.

Q: Is the resistance between 300 and 90k ohms?

YES: Go To 2
NO: Replace the battery temp sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

2. (K25) SIGNAL CIRCUIT SHORTED TO GROUND





Disconnect the ECM harness connectors.
Check connectors - Clean/repair as necessary.
Measure the resistance between the engine ground and the temperature sensor (K25) signal circuit at the sensor connector.

Q: Is the resistance more than 100 k ohms?

YES: Go To 3
NO: Repair the Battery temp sensor (K25)signal circuit shorted to ground. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

3. (K25) SIGNAL CIRCUIT SHORTED





Measure the resistance between the Battery temp sensor (K25) signal circuit and all other circuits in the ECM harness connector of the engine harness.

Q: Is the resistance more than 100k ohms?

YES: Go To 4
NO: Repair the (K25) signal circuit shorted to another circuit. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

4. INTERMITTENT CONDITION
Reconnect the disconnected Battery temp sensor harness connector.
While monitoring with scan tool, disconnect the temperature sensor harness connector.

Q: Did P0517 set?

YES: Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
NO: Replace the ECM. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1