Charging Sys-Full Description-Trigger Voltages-Test Results

[colin39]

I am working on a hunch - but when you get it back together, I need to know any other issues you are having other than throttle limitation.
Anything else noted - hard starting, IPC Messages, door locks not working and I am focused on the Gen Desired Voltage - defaulting to 10.6
Plus, it would help to know, what has been Replaced and or checked so far - Detailed

I have a hunch that the PCM is losing the ISP-R. (Input)
Ignition Switch Position Run - This data is sent across all the data busses.
But for the PCM:
BCM to PAM & PCM - via HSCAN 1

With KOEO (Key on Engine Off) that is the normal Gen Desired Voltage 10.6 Volts, so it MAY possibly be an issue on this circuit, the PCM is thinking the engine should be off as it may be losing the ignition switch position.
I need to dig some more, to see what other factors could trigger the 10.6.
Just throwing out possible.

I have no other issues , ive been fighting this for 12months no fault codes nothing , just the cut. Annoyingly it could be fine for 3 or 4 hours


With KOEO (Key on Engine Off) that is the normal Gen Desired Voltage 10.6 Volts, so it MAY possibly be an issue on this circuit, the PCM is thinking the engine should be off as it may be losing the ignition switch position.
I need to dig some more, to see what other factors could trigger the 10.6.
Just throwing out possible.

Ive never looked but that sounds like a place to start

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[colin39]

I am working on a hunch - but when you get it back together, I need to know any other issues you are having other than throttle limitation.
Anything else noted - hard starting, IPC Messages, door locks not working and I am focused on the Gen Desired Voltage - defaulting to 10.6
Plus, it would help to know, what has been Replaced and or checked so far - Detailed

I have a hunch that the PCM is losing the ISP-R. (Input)
Ignition Switch Position Run - This data is sent across all the data busses.
But for the PCM:
BCM to PAM & PCM - via HSCAN 1

With KOEO (Key on Engine Off) that is the normal Gen Desired Voltage 10.6 Volts, so it MAY possibly be an issue on this circuit, the PCM is thinking the engine should be off as it may be losing the ignition switch position.
I need to dig some more, to see what other factors could trigger the 10.6.
Just throwing out possible.

Wow as for things thats been changed.....
5 injectors
Fuel pump high pressure and low pressure
Turbos 3 of em (dont ask long story none failed)
Gear box 6r80 inc torque converter
Wiring harness for the gearbox
Tcm
Pcm
Every sensor on the engine (all oem)

 

[colin39]

			Ok update, Found nothing tbh, unplugged every plug from behind the dash to the engine bay fuse box checked for loose of rotten pins or sockets and found none, replaced all the relays in the fuse box and 4.5k miles later ive had no issues , so at the moment im calling it fixed. @airline tech thank you for all your help and anyone else that chimed in

 

[TJC]

			Ok update, Found nothing tbh, unplugged every plug from behind the dash to the engine bay fuse box checked for loose of rotten pins or sockets and found none, replaced all the relays in the fuse box and 4.5k miles later ive had no issues , so at the moment im calling it fixed. @airline tech thank you for all your help and anyone else that chimed in

So did you ever narrow the problem to a specific relay or corroded contact ?

It is good that you resolved the issue. Still curious though.

 

[colin39]

So did you ever narrow the problem to a specific relay or corroded contact ?

It is good that you resolved the issue. Still curious though.

No never found anything obvious, other than the "generator desired voltage" which turned out to nothing to do with the lin wiring.
But the relay coil for the engine ecu had a hugely high resistance , the fuel pump relay had high resistance , compared to the ones next to them. 5 in total 2 bad 3 reasonable , so as a punt i replaced them.
I did compare them to another ranger but tbh only after i had changed them out.


It stays working , it is like a different vehicle.

Colin

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