Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1127
3.
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
>> Remove the Engine Oil Pressure sensor and ensure the oil
passage/port is free from any blockage. If OK, replace the
Engine Oil Pressure Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
NOTE: Remove the jumper wire before continuing.
4.
EXCESSIVE RESISTANCE IN THE (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the PCM harness connectors.
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
to perform diagnosis.
Measure the resistance of the (G6) Engine Oil Pressure Signal circuit
from the Engine Oil Pressure Sensor harness connector to the appro-
priate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the excessive resistance in the (G6) Engine Oil
Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
9 - 532
ENGINE ELECTRICAL DIAGNOSTICS
LX
5.
(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (G6) Engine Oil Pres-
sure Signal circuit in the Engine Oil Pressure Sensor harness connec-
tor.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (G6) Engine Oil Pressure
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
EXCESSIVE RESISTANCE IN THE (F856) 5–VOLT SUPPLY CIRCUIT
Measure the resistance of the (F856) 5-volt Supply circuit from the
Engine Oil Pressure Sensor harness connector to the appropriate ter-
minal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the excessive resistance in the (F856) 5-volt Supply
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 533
7.
(F856) 5-VOLT SUPPLY SHORTED TO GROUND
Measure the resistance between ground and the (F856) 5-volt Supply
circuit in the Engine Oil Pressure Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (F856) 5-volt Supply cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
8.
EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
Measure the resistance of the (K900) Sensor Ground circuit from the
Engine Oil Pressure Sensor harness connector to the appropriate ter-
minal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 9
No
>> Repair the excessive resistance in the (K900) Sensor
Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
9 - 534
ENGINE ELECTRICAL DIAGNOSTICS
LX
9.
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)
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 535
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