Welcome to DieselPlace

 

I also want to add I have a Diablo tuner that came with the truck. It was able to read all codes, clear all codes, and view some live data. Now it will not allow me to says cannot read/clear codes and will say cannot view live data. Snapon, mac, and a cheap 50 dollar code reader from walmart can still read and clear codes(All of which are friends who help when they get a moment)

 

I'll have a look further when I get some time, but it sounds like the ECM can't talk to the CKP, and you have a module (ECM, TCM, BCM etc) that is being missed.


No, if the ECM can't figure out where the CK is, it will not inject fuel. That would be bad. Berry berry bad.

Keep in mind that just because you replaced the CKP doesn't meant 1. That the new sensor works or 2. That the ECM can talk to it. Test...

LB7 P0335 Code

Truck died on me yesterday, 2004 LB7 Cali emissions, had it towed home, pulled codes, P0335. Changed the Crank Position Sensor, ran like a top for about 8 miles this morning and died again. Have a code but haven't pulled it yet. What's chances of the sensor shitting the bed that quick? It...

www.duramaxforum.com

I'm assuming P0335'B' was a typo?

If the ECM is not working, or connected correctly, that could be why you could now not be able to erase codes. But it might just have lost its stuff. Hard to say. I would definitely check the plugs for corrosion, and verify that all the grounds are good. I can't tell you how many times guys have swapped an engine and forgot one, and the truck totally goes haywire.

Thank you for your detailed write-up. It makes it worth spending the time to try and help you sort it out

 

I'll have a look further when I get some time, but it sounds like the ECM can't talk to the CKP, and you have a module (ECM, TCM, BCM etc) that is being missed.


No, if the ECM can't figure out where the CK is, it will not inject fuel. That would be bad. Berry berry bad.

Keep in mind that just because you replaced the CKP doesn't meant 1. That the new sensor works or 2. That the ECM can talk to it. Test...

LB7 P0335 Code

Truck died on me yesterday, 2004 LB7 Cali emissions, had it towed home, pulled codes, P0335. Changed the Crank Position Sensor, ran like a top for about 8 miles this morning and died again. Have a code but haven't pulled it yet. What's chances of the sensor shitting the bed that quick? It...

www.duramaxforum.com

I'm assuming P0335'B' was a typo?

If the ECM is not working, or connected correctly, that could be why you could now not be able to erase codes. But it might just have lost its stuff. Hard to say. I would definitely check the plugs for corrosion, and verify that all the grounds are good. I can't tell you how many times guys have swapped an engine and forgot one, and the truck totally goes haywire.

Thank you for your detailed write-up. It makes it worth spending the time to try and help you sort it out

I can erase the codes using a snapon scanner or a mac scanner no problems just the diablo tuner scanner thing will not work anymore. And this is a picture of the code when I had the scanner. Ill look into the test tomorrow after work.

 

 

Cool. Must be a Mac thing. I wouldn't know, I'm just a home gamer

 

Cool. Must be a Mac thing. I wouldn't know, I'm just a home gamer

Same man 😂
Checked the ground and they all appear to be good. Also had a wire tester and everything was reading normal I believe.

I still have not been able to get someone with a scanner to come back so I’m going to get some tuner that is capable or viewing codes and live data hopefully by the end of the year. They are a little pricey.

 

This was a line running from the return line on the CP3, I did this 2 times and this is my result. Would this mean I have a bad CP3?

 

Would this mean I have a bad CP3?

No. But why did you do that? Hey, at least you know you've got fuel to the CP3!

Your truck is throwing codes because It can't figure out where the CKP is. If it doesn't know where it is, it can't time the fuel injection, so it won't inject fuel. You'll have bypassing fuel at the CP3 via the cascade and overflow valve for sure. You have to fix that sensor issue. I know you've checked, but you have shorts or opens somewhere. You must. You probably have at least 2 shorts. That's why one of the modules isn't reporting in like it's supposed to and you're getting a P1000. Test the wire...

CONDITIONS FOR RUNNING THE DTC

P0335
- The engine is cranking or running.
- The camshaft position (CMP) sensor signal is present.
- DTC P0335 runs continuously when the above conditions are met.

P0336
- The engine is cranking or running.
- DTC P0336 runs continuously when the above condition is met.

CONDITIONS FOR SETTING THE DTC

P0335
The ECM determines no signal from the CKP sensor for less than 8 seconds.

P0336
The ECM determines that the CKP sensor signal is out of range for less than 2 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
- An intermittent CKP sensor signal may cause DTC P0336 to set. Wiggle the wiring harness with the engine running and observe the CKP Sensor Pulses Missed parameter on the scan tool. If the parameter indicates anything other than 0, there is an intermittent condition.
- Inspect for insufficient fuel.

CIRCUIT/SYSTEM VERIFICATION
- If DTCs P0642 or P0643 are set, diagnose those DTCs first.
- The engine starts and runs.
- Engine running, observe the DTC information with a scan tool. DTCs P0335 or P0336 should not set.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame Records data.

CIRCUIT/SYSTEM TESTING
1. With the key ON and the CKP sensor disconnected, measure the voltage between the 5-Volt reference and a good ground and observe that the DMM measures 4.98-5.02 volts.
- If the DMM does not measure 4.98-5.02 volts, test the 5-Volt reference for an open or high resistance. If the circuits test normal, replace the control module.
2. With the key ON and the CKP sensor disconnected, measure the voltage between the 5-Volt reference circuit and the low reference circuit, and observe that the DMM measures 4.98-5.02 volts.
- If the DMM does not measure 4.98-5.02 volts, test the low reference for an open or high resistance. If the circuits test normal, replace the control module.
3. With the key ON and the CKP sensor disconnected, connect a fused jumper wire to the signal circuit and momentarily and repeatedly probe the low reference circuit, and observe that the Crank Signal Present and engine RPM parameters change.
- If the crank signal parameter and engine RPM does not change, test the signal circuit for an open, high resistance, a short to ground, a short to voltage. If the circuits test normal, replace the control module.
4. Ensure that the CKP sensor circuits are not routed too closely to the fuel injector wiring, after-market add-on electrical equipment, solenoids, relays, or motors.
5. Inspect the CKP sensor for physical damage, loose or improper installation, excessive air gap, or foreign material passing between the sensor and the reluctor wheel.
6. Inspect the CKP reluctor wheel for physical damage, improper installation, or excessive endplay or looseness.
7. If no other condition is found, replace the CKP sensor.

 

Thank you so much for letting us know what you found. There's nothing more devious than getting a brand new part that doesn't work because you just naturally assume it's a good part. Such a pain in the neck. Glad you got it running!