Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1122
P0520-ENGINE OIL PRESSURE SENSOR CIRCUIT
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
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•
When Monitored:
Ignition on, engine not running.
•
Set Condition:
The PCM senses the oil pressure is out of the calibrated range.
Possible Causes
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
RESISTANCE (G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
RESISTANCE IN (F856) 5-VOLT SUPPLY CIRCUIT
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
ENGINE OIL PRESSURE SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
NOTE: Ensure that the engine oil is at the proper level. Also, check the customers oil change history to
ensure that the oil is being changed at the correct intervals and that the proper oil viscosity is being used.
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
ENGINE OIL PRESSURE SENSOR
Turn the ignition off.
Connect the PCM harness connectors.
Ignition on, engine not running.
With a scan tool, monitor the Engine Oil Pressure Sensor voltage.
Connect a jumper wire between the (K900) Sensor Ground circuit and
the (G6) Engine Oil Pressure Signal circuit.
NOTE: Engine Oil Pressure voltage should change from approxi-
mately 4.5 volts to less than 0.5 of a volt.
Is the voltage reading within the listed specification when the
jumper wire is installed?
Yes
>> Replace the Engine Oil Pressure Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
NOTE: Remove the jumper wire before continuing.
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ENGINE ELECTRICAL DIAGNOSTICS
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3.
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT HIGH RESISTANCE
Turn the ignition off.
CAUTION: CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will
damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815
along with the 8815-1 to perform the diagnosis.
Using a voltmeter perform a voltage drop test. Backprobe the (G6) Engine Oil Pressure Signal circuit at the Engine
Oil Pressure Sensor harness connector to the appropriate terminal of the special tool #8815. Ensure the voltmeter
leads are connected with the circuit’s correct polarity.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands
near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in
personal injury or death.
Start the engine and allow it to reach normal operating temperature.
Monitor the voltmeter.
Is the voltage below 0.5 volts?
Yes
>> Go To 4
No
>> Repair the excessive resistance in the (G6) Engine Oil Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
(F856) 5-VOLT SUPPLY CIRCUIT HIGH RESISTANCE
Turn the ignition off.
Perform a voltage drop test. Backprobe the (F856) 5-volt Supply circuit at the Engine Oil Pressure Sensor harness
connector to the appropriate terminal of the special tool #8815. Ensure the voltmeter leads are connected with the
circuit’s correct polarity.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands
near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in
personal injury or death.
Start the engine and allow it to reach normal operating temperature.
Monitor the voltmeter.
Is the voltage below 0.5 volts?
Yes
>> Go To 5
No
>> Repair the excessive resistance in the (F856) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.
(K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE
Turn the ignition off.
Perform a voltage drop test. Backprobe the (K900) Sensor Return circuit at the Throttle Body harness connector to
the appropriate terminal of the special tool #8815. Ensure the voltmeter leads are connected with the circuit’s cor-
rect polarity.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands
near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in
personal injury or death.
Start the engine and allow it to reach normal operating temperature.
Monitor the voltmeter.
Is the voltage below 0.5 volts?
Yes
>> Go To 6
No
>> Repair the excessive resistance in the (K900) Sensor Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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6.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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