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Old 09-29-2007, 01:09 PM   #1
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Cps ?????

Hello all Jeep gurus, I've been lurking for the past two weeks and decided to join. i was wondering if anyone can diagnose my issue. I have a 05 TJ X. My error code is P0344 (CPS). I had it changed a couple of days ago(warranty). Now I've got it again. The symptoms are when I have to do a hard acceleration like when merging on the streets, i get fuel lag. It feels like the fuel pump is cutting out on me and then the CEL comes on. What do you guys think is causing the CPS code if it's not the CPS at fault? Thanks.

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Old 09-29-2007, 01:18 PM   #2
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Sounds like your crank position sensor is fine. Could be fuel or ignition problem first start by checking all the connections.

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Old 09-29-2007, 01:43 PM   #3
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Appreciate the reply,

will check. thanks.
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Old 09-29-2007, 02:35 PM   #4
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Welcome to WF.

Good luck getting you jeep working the way it should.
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Old 09-29-2007, 08:49 PM   #5
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welcome to wf

im no mechanic so i cant help though
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Old 09-29-2007, 11:05 PM   #6
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Warmest Welcome!
Start by taking it back to the dealership and letting them service the issue correctly.

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Old 03-26-2010, 05:17 PM   #7
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I have the same jeep and the same problem. I've changed the camshaft pos. sensor, the crankshaft pos sensor, the spark plugs...i dont know what to do and I am not under warranty. I see your problem was a few years ago, any insight as to what the cause was? I think its a faulty wire or connection between the sensor and the receptor but idk...let me know!
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Old 03-26-2010, 06:29 PM   #8
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X2 take it back to the dealer. They love taking shortcuts, just had mine back for the third time under warranty for the same code. They were willing to " fore-go" the deductible this time. (like I would have paid it again)
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Old 03-26-2010, 06:33 PM   #9
Knows a couple things...

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My gut reaction is to clean/rinse out with contact cleaner or WD-40, then reseat the connectors for both the CKP (crankshaft position sensor) and CPS (camshaft position sensor).

Next, closely examine the wiring harness for both connectors. Look for any signs of damage, wear, burned spots, etc.

Next is a troubleshooting procedure. Such lengthy procedures often make my eyes glaze over but if nothing else does it, there's not much else left to try.

Symptom:
P0344-CAMSHAFT POSITION SENSOR INTERMITTENT
When Monitored and Set Condition:
P0344-CAMSHAFT POSITION SENSOR INTERMITTENT
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
GOOD TRIP EQUAL TO ZERO
CMP WIRE HARNESS INSPECTION
(K6) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND
TONE WHEEL/PULSE RING INSPECTION
CHECKING CKP SENSOR SIGNAL WITH THE DRBIIIt LAB SCOPE
CAMSHAFT POSITION SENSOR
(K44) CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K44) CMP SIGNAL CIRCUIT OPEN
(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND
(K44) CMP SIGNAL CIRCUIT SHORTED TO (K6) 5-VOLT SUPPLY
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes ! Go To 2
No ! Refer to the INTERMITTENT CONDITION Symptom (Diagnostic
Procedure).
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.

2 Turn the ignition off.
With the DRBIIIt 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 A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
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?
All
Yes ! Go To 3
No ! Go To 8
3 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.
Ensure the Crankshaft Position Sensor and the Camshaft Position Sensor are
properly installed and the mounting bolt(s) are tight.
Refer to any TSBs that may apply.
Were any of the above conditions present?
All
Yes ! Repair as necessary
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 4
4 Disconnect the CMP Sensor connector.
Ignition on, engine not running.
Measure the voltage on the (K6) 5-volt Supply circuit in the CMP harness connector.
Is the voltage between 4.5 and 5.2 volts?
All
Yes ! Go To 5
No ! Repair the open or short to ground in the (K6) 5-volt Supply
circuit. Use Miller special tool #8815 when checking for an open
circuit to prevent PCM harness connector terminal damage.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
5 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?
All
Yes ! Repair or replace the Tone Wheel/Pulse Ring as necessary.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 6

6 NOTE: An intermittent glitch in the Crank Position Sensor can cause the
P0344 to set.
Install the CMP Sensor and connect the Battery cable.
With the DRBIIIt 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 A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
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?
All
Yes ! Replace the Crank Position Sensor.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 7
7 If there are no possible causes remaining, view repair. All
Repair
Replace the Camshaft Position Sensor.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
8 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?
All
Yes ! Repair the short to voltage in the (K44) CMP Signal circuit.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 9
9 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?
All
Yes ! Go To 10
No ! Repair the excessive resistance in the (K44) CMP Signal circuit.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.

10 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 go below 100 ohms?
All
Yes ! Repair the short to ground in the (K44) CMP Signal circuit.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 11
11 Measure the resistance between the (K6) 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?
All
Yes ! Repair the short between the (K6) 5-volt Supply circuit and the
(K44) CMP Signal circuit.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
No ! Go To 12
12 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.
If there are no possible causes remaining, review repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.
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Old 04-06-2010, 12:20 PM   #10
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How can you bench test the CPS to see if its faulty?

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