Dodge Ram Truck 1500-2500-3500. Manual — part 1091
P0516-LOW VOLTAGE AT THE BAT TEMP SENSOR
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0516-LOW VOLTAGE AT THE BAT TEMP SENSOR (CONTINUED)
For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)
For a complete wiring diagram Refer to Section 8W.
•
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. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
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.
Is the resistance between 300 and 90k ohms?
Yes
>> Go To 2
No
>> Replace the battery temp sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
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P0516-LOW VOLTAGE AT THE BAT TEMP SENSOR (CONTINUED)
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 tempera-
ture sensor (K25) signal circuit at the sensor connector.
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 POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
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.
Is the resistance more than 100k ohms?
Yes
>> Go To 4
No
>> Repair the (K25) signal circuit shorted to another circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0516-LOW VOLTAGE AT THE BAT TEMP SENSOR (CONTINUED)
4.
INTERMITTENT CONDITION
Reconnect the disconnected Battery temp sensor harness connector.
While monitoring with scan tool, disconnect the temperature sensor harness connector.
Did P0517 set?
Yes
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
No
>> Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1289
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