2003 Duramax LB7
 

Hello Everyone,

I am hoping for some help from you guys. I drive a 2003 Chevy Duramax Crew Cab 4x4 with the LB7 engine. I have the Banks 4" exhaust and the Banks Cold Air Intake with Super Scoop and the Edge Attitude Chip for aftermarket parts.
Here is my problem: When driving down the road in my truck, the truck will all of a sudden shut off. I coast to a stop and pull over to the side of the road where I try to start the truck with no success. I try several more times to start the truck but have no success. Finally after approximately 10 minutes of setting there the truck will start. It seems like the truck has to cool off before it will start again. The code that is set from my check engine light is a P0335 Crankshaft Position Sensor "A" Circuit Malfunction. I purchased a Crankshaft Postion Sensor and wiring connector from Chevrolet and replaced the old one. The truck has worked fine for the last couple of days until today when the exact same problem and engine code reappeared. If any one has any ideas or have had this problem before please let me know. Thank you for your time.

CIRCUIT DESCRIPTION
The hall effect crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. There are 57 teeth on the front of the crankshaft sprocket, plus a sync gap. The CKP sensor will output an ON-OFF pulse as each window passes the sensing element. The CKP sensor is connected directly to the electronic control module (ECM) by the following circuits:

• The 12- volt reference circuit
• The low reference circuit
• The CKP sensor signal circuit

CONDITIONS FOR RUNNING THE DTC

• The engine is cranking or running.
• The camshaft position (CMP) sensor signal is present.

CONDITIONS FOR SETTING THE DTC
The engine control module (ECM) determines no signal from the CKP sensor for less than 8 seconds .

ACTION TAKEN WHEN THE DTC SETS

• The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
• The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC

• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
• Clear the MIL and the DTC with a scan tool.

DIAGNOSTIC AIDS

IMPORTANT:

• Remove any debris from the ECM connector surfaces before servicing the ECM. Inspect the ECM connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM.
• For any test that requires probing the ECM or the component harness connectors, use the J 35616-A Connector Test Adapter Kit. Using this kit prevents any damage to the harness connector terminals. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.
• The following conditions may cause this DTC to set:
• Any poor connections or poor terminal tension at the sensor. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.
• Any crankshaft reluctor wheel damage or improper installation
• The sensor coming in contact with the reluctor wheel
• The engine running out of fuel
• Excess crankshaft end play causes the CKP sensor reluctor wheel to move out of alignment with the CKP sensor. This could result in any one of the following conditions:
• A no start
• A start and stall
• Erratic performance
• For an intermittent, refer to Intermittent Conditions. See: Initial Inspection and Diagnostic Overview\Diagnostic Strategies\Intermittent Conditions

TEST

Attachment 50059

Attachment 50060

Can these tests be done with the truck running fine or does the truck have to act up in order for these tests to be accurate? Thanks