2003 6.0 No Start
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I returned pcm/tcm back to stock programming after re-installing my original ficm (wasn’t sure if leaving the other ficm on during reprogram would change it’s programming) and the engine does sound like it’s trying to fire, same as it did with the “known good ficm” I tried, and the injectors have the same audible tone now as with the other ficm (side note the truck has been plugged in since yesterday and EOT is probably ~90F) but I didn’t get any of the dtc’s I saw with that other ficm even after a few crank cycles. I did, as a hail mary, unplug the icp and try cranking again, and it cranked with no sign of trying to fire. I did wiggle wire harnesses and had P0670 pop up (Gpcm related) but it didn’t come back after a reset and another KOEO.
I haven’t had any injector-related dtc’s at any point that came back, but I guess I also haven’t had the truck running to run a balance test, but I don’t know if I should be thinking about going right to injectors right now?? And if that is the recommended course of action where should I be calling for injector rebuilding service?
At this point I’ll start removing the wire harnesses for close inspection and testing.
I haven’t had any injector-related dtc’s at any point that came back, but I guess I also haven’t had the truck running to run a balance test, but I don’t know if I should be thinking about going right to injectors right now?? And if that is the recommended course of action where should I be calling for injector rebuilding service?
At this point I’ll start removing the wire harnesses for close inspection and testing.
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This is when I wish we had an inexpensive way to do an uncompensated contribution test. Worth considering taking it in.
That said, where I was going with the disconnecting of #5 is that one injector solenoid shorting out might affect the performance of the others.
Unfortunately you didn't see any other injector identified as an issue (codes).
Have you addressed the P0046 - VGT connector/wiring short? Maybe that is pulling down the VPOWER
That said, where I was going with the disconnecting of #5 is that one injector solenoid shorting out might affect the performance of the others.
Unfortunately you didn't see any other injector identified as an issue (codes).
Have you addressed the P0046 - VGT connector/wiring short? Maybe that is pulling down the VPOWER
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Yeah, I’m thinking the same, it’s a pita when there’s no solid dtc(s) to run off of. The VGT dtc didn’t come back after re-installing my ficm and reverting to stock programming. I did look at the wires for any chaffing and pulled the plug and re-installed, but maybe I should dive further into that and check the pid’s during KOEO and cranking.
*I should add again that I probably had the vacuum pump connector disconnected when that VGT code popped up, and my cold side cac is off, not sure if either could cause it but felt it was relevant.
*I should add again that I probably had the vacuum pump connector disconnected when that VGT code popped up, and my cold side cac is off, not sure if either could cause it but felt it was relevant.
Last edited by pnw_at; Jan 30, 2022 at 05:18 PM.
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This is a WAG. But when you changed your secondary fuel filter the last time, did you install it in the top first then put it on the spring loaded shutoff valve? If the filter twists or crushes slightly, it will not completely open the shutoff valve and over time the valve will complete shut. Been there, done that. I know you have fuel pressure. Not sure if the pressure is measured on the pump or injector side of the fuel bowl. Might be worth a check.
Ed
Ed
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This is a WAG. But when you changed your secondary fuel filter the last time, did you install it in the top first then put it on the spring loaded shutoff valve? If the filter twists or crushes slightly, it will not completely open the shutoff valve and over time the valve will complete shut. Been there, done that. I know you have fuel pressure. Not sure if the pressure is measured on the pump or injector side of the fuel bowl. Might be worth a check.
Ed
Ed
And I'm checking pressure at the port on the side of the bowl by the pressure regulator cover. I don't have a gauge tapped into the cap.
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AK2 DIAGNOSTIC TROUBLE CODE (DTC) P0046
AK3 is taking active control of VGT and testing (if you have that ability)
AK7 is referenced and it is for cleaning the VGT
AK4 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
AK5 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO GROUND
AK6 CHECK VGT CONTROL CIRCUIT FOR AN OPEN
- Key off.
- Disconnect the VGT actuator electrical connector.
- Key on.
- Measure the voltage between the VGT electrical connector pin 1 and ground.
AK3 is taking active control of VGT and testing (if you have that ability)
AK7 is referenced and it is for cleaning the VGT
AK4 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Key off.
- Remove the test light.
- Disconnect the PCM engine harness electrical connector.
- Key on.
- Measure the voltage between the VGT actuator harness connector pin 2 and ground.
AK5 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO GROUND
- Key off.
- Measure the resistance between VGT actuator connector pin 2 and ground.
AK6 CHECK VGT CONTROL CIRCUIT FOR AN OPEN
- Measure the resistance between the VGT actuator connector pin 2 and PCM connector pin 10.
Thread Starter
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Freshman User
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AK2 DIAGNOSTIC TROUBLE CODE (DTC) P0046
AK3 is taking active control of VGT and testing (if you have that ability)
AK7 is referenced and it is for cleaning the VGT
AK4 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
AK5 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO GROUND
AK6 CHECK VGT CONTROL CIRCUIT FOR AN OPEN
- Key off.
- Disconnect the VGT actuator electrical connector.
- Key on.
- Measure the voltage between the VGT electrical connector pin 1 and ground.
AK3 is taking active control of VGT and testing (if you have that ability)
AK7 is referenced and it is for cleaning the VGT
AK4 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Key off.
- Remove the test light.
- Disconnect the PCM engine harness electrical connector.
- Key on.
- Measure the voltage between the VGT actuator harness connector pin 2 and ground.
AK5 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO GROUND
- Key off.
- Measure the resistance between VGT actuator connector pin 2 and ground.
AK6 CHECK VGT CONTROL CIRCUIT FOR AN OPEN
- Measure the resistance between the VGT actuator connector pin 2 and PCM connector pin 10.