Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1090
•
When Monitored:
While cranking the engine and engine running.
•
Set Condition:
When the failure counter reaches 20. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K44) CMP SIGNAL CIRCUIT OPEN
(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND
(K44) CMP SIGNAL CIRCUIT SHORTED TO (F856) 5-VOLT SUPPLY
TONE WHEEL/PULSE RING
CAMSHAFT POSITION SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
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.
CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE
Install Miller Special Tools #8815 and #8815-1 to perform diagnosis.
Using a lab scope, probe the (K44) CMP Signal circuit in the appropri-
ate terminal of special tool #8815.
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 instruc-
tions can result in personal injury or death.
Ignition on, engine not running.
Observe the lab scope screen.
Start the engine.
Observe the lab scope screen.
Are there any irregular or missing signals?
Yes
>> Go To 3
No
>> Go To 8
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ENGINE ELECTRICAL DIAGNOSTICS
LX
3.
WIRE HARNESS INSPECTION
Turn the ignition off.
Visually inspect the related wire harness including the ground circuit. Look for any chafed, pierced, pinched, or par-
tially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mount-
ing bolt(s) are torqued to the proper specification.
Refer to any TSBs that may apply.
Were any of the above conditions present?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(F856) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND
Disconnect the CMP Sensor connector.
Ignition on, engine not running.
Measure the voltage on the (F856) 5-volt Supply circuit in the CMP har-
ness connector.
Is the voltage between 4.5 and 5.2 volts?
Yes
>> Go To 5
No
>> Repair the open or short to ground in the (F856) 5-volt Sup-
ply circuit. Use Miller special tool #8815 when checking for
an open circuit to prevent PCM harness connector terminal
damage.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
5.
TONE WHEEL/PULSE RING INSPECTION
Turn the ignition off.
Carefully disconnect the Battery Ground cable.
Remove the Camshaft Position Sensor.
Inspect the Tone Wheel/Pulse Ring for damage, foreign material, or excessive movement.
Were any problems found?
Yes
>> Repair or replace the Tone Wheel/Pulse Ring as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 385
6.
CHECKING CRANKSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE
NOTE: An intermittent condition in the Crank Position Sensor can
cause the P0344 to set.
Install the CMP Sensor and connect the Battery cable.
Install Miller Special Tools #8815 and #8815-1 to perform diagnosis.
Using a lab scope, probe the (K24) CKP Signal circuit in the appropri-
ate terminal of special tool #8815.
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 instruc-
tions can result in personal injury or death.
Ignition on, engine not running.
Wiggle the related wire harness and lightly tap on the Crank Position
Sensor.
Observe the lab scope screen.
Start the engine.
Observe the lab scope screen.
Are there any irregular or missing signals?
Yes
>> Replace the Crank Position Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
7.
CAMSHAFT POSITION SENSOR
If there are no possible causes remaining, view repair.
Repair
Replace the Camshaft Position Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
8.
(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the CMP Sensor connector.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (K44) CMP Signal circuit.
Wiggle the related wire harness while taking this measurement.
Does the voltage ever increase above 5.2 volts?
Yes
>> Repair the short to battery voltage in the (K44) CMP Signal
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 9
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ENGINE ELECTRICAL DIAGNOSTICS
LX
9.
(K44) CMP SIGNAL CIRCUIT OPEN
Turn the ignition off.
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 in the (K44) CMP Signal circuit from the CMP
harness connector to the appropriate terminal of special tool #8815.
Wiggle the related wire harness while taking this measurement.
Is the resistance below 5.0 ohms?
Yes
>> Go To 10
No
>> Repair the excessive resistance in the (K44) CMP Signal
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
10.
(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K44) CMP Signal cir-
cuit in the CMP Sensor harness connector.
Wiggle the related wire harness while monitoring the resistance value.
Does the resistance ever go below 100 ohms?
Yes
>> Repair the short to ground in the (K44) CMP Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 11
LX
ENGINE ELECTRICAL DIAGNOSTICS
9 - 387
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