P0344-CAMSHAFT POSITION SENSOR INTERMITTENT
For a complete wiring diagram Refer to Section 8W.
Possible Causes
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(F856) 5-VOLT SUPPLY CIRCUIT OPEN
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(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
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(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
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(K44) CMP SIGNAL CIRCUIT OPEN
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(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND
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(K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT
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TONE WHEEL/PULSE RING
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CAMSHAFT POSITION SENSOR
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PCM
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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, select View DTCs.
Is the DTC Active at this time?
Yes
No
2.
CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE
Turn the ignition off.
With a lab scope probe and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the CMP harness connector.
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.
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
No
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 partially 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 mounting bolt(s) are torqued to the proper specification.
Refer to any TSBs that may apply.
Were any of the above conditions present?
Yes
No
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 harness connector.
Is the voltage between 4.5 and 5.2 volts?
Yes
No
-
Repair the open or short to ground in the (F856) 5-volt Supply 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
No
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.
With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the CKP harness connector.
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.
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
No
7.
CAMSHAFT POSITION SENSOR
If there are no possible causes remaining, view repair.
Repair
8.
(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the CMP Sensor connector.
Disconnect the C2 PCM harness connector.
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 0 volts?
Yes
No
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
No
10.
(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K44) CMP Signal circuit in the CMP Sensor harness connector.
Wiggle the related wire harness while monitoring the resistance value.
Does the resistance ever drop below 100 ohms?
Yes
No
11.
(K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (F856) 5-volt Supply circuit and the (K44) CMP Signal circuit in the CMP harness connector.
Wiggle the related wire harness while taking this measurement.
Is the resistance below 5.0 ohms?
Yes
No
12.
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
No