F360 CEL code P1269

I have a 360 that runs only one bank 1, bank 2 has an error code P1269 and is shut off by the computer. Touching the headers confirmed that bank 2 is not running and remains cold to the touch while bank 1 is hot.

The 360 OBD code list has a generic descriptor "Function Monitoring, Safety Fuel Cut off" while my code reader has a more descriptive name for that code: "Throttle Safety Function, Bank 2"

I am extrapolating the two descriptions to mean "something is wrong with the electronic throttle self-test and bank 2 is shut off"

Questions for those of you in the know:

1) does that sound like a plausible extra-polation for the error code?
2) Doesn't the left hand side ECU control the right hand side throttle plate? If so, how does it know that the left side throttle plate is bad?
3) How do I test a electronic throttle plate functionality?

I seem to remember a thread by Trev360 a few months ago about throttle plate testing ...

 

Update: So it got better and much worse at the same time.

I was able to get the car reliably running on both banks by swapping out a flaky master relay, and cutting the power to the battery overnight. The shut down error has not repeated. Armed with the running car, I have been driving the drive cycle for 2 days to reset all the smog monitors to pass smog in California. No CEL, no pending DTC for 2 days. On the third day, the engine fired up and ran for a minute then the CEL light came on. There were 12 engine error codes. There were so many I had to group them into groups to make sense.

Group 1: Road Bed Roughness Signal (what the hell is that?)
Group 2: Intake manifold switching valve, evap system purge valve, secondary air pump switching valve
Group 3: Air Mass Flow Circuit Low
Group 4: Heater O2 Sensor B1 S2
Group 5: Misfires on Bank 2 Cyl 5 and 8

I am going to see if I can do a vacuum test, smoke test on the intake manifold to check out the valves, and continuity check on MAF.
Then probably look to see loose connection somewhere.
Does anybody have a clue what Road Bed Roughness mean?

 

I did the last time it paid me a visit. But I will check the battery again.

 

I did all the smoke test and vacuum tests of the Evap circuits and connectors, Secondary air injection circuit and valve, Modular manifold tuning valve circuit and vacuum test... everything is working well. Seeing though many of these error codes have to do with "signal xx shorted to ground" I am going to do an experiment to see if the short is actually inside the CPU module. I will swap CPU left to right, cut power over night, and drive cycle the next few days to see if some of the errors move from bank to bank.

I do want to change the rear O2 sensor on Bank1 or the smog monitor will never set.

 

Trevor , I already have the error codes isolated between banks:

Bank 1: Road roughness code, Sec Air Inj codes, Manifolds tuning codes, MAF code, O2 sensor code
Bank 2: road roughness code, misfires 300/301/304

I will swap the CPUs left to right anyway but it is unlikely to affect the Sec Air Inj, and manifold codes since those functions are specific to bank 1. The O2 sensor code and MAF code may move.

 

@360trev ,

On the pdf document you attached, if the error codes are shown to be logged by Bank 1, then that condition happened on Bank 1, even though the codes are being logged by Bank 2 ECU?
Am I reading that correctly?

For example, all misfire codes are grouped under Bank 1 ... but cyl 5-8 are obviously on Bank 2. Does that make any sense

 

Also the pdf document refers to LH bank as Bank 1, and RH bank as Bank 2. In Ferrari speaks, it is RH bank to be Bank 1 and LF bank to be Bank 2.

But, putting all that aside, and using the information in the document, I have segregated all error codes to come from right Bank. There are three misfire codes tied to the CPU on bank 2, 300/301/304, and those are misfires for Cyl 1 and Cyl 4, which are also on Right Bank.

The exercise indicates that all error conditions are happening on the right bank, and the causes are likely bad wiring, or bad ECU, or bad circuits inside the ECU unit.

Does that compute?

 

Also, the side comments for many of the codes refer to a "power amplifier ... " that must indicate something inside the ECU box...

 

I swapped the ECU over and it will take several days of cold start and driving to see any changes. There is one additional clue that happened before the change and after the change.

Sometimes during the drive, the ASR warning light comes on, the ABS light comes on, and the Speedometer drops to zero. Turning the car off, and back on again makes that error condition go away. This was before the ECU change as well as after the ECU swap. I'm unsure if it is related to all the other codes but I thought full disclosure is better.

 

Update:

@Qavion, @360trev, @flash32

Two days of driving after swapping the ECU L/R,

1) No CEL yet, pending codes P1149 and P1189
2) Speedo meter did drop to zero and works again after car is restarted. Before and after the swap pointing to a real Wheel Speed sensor issue at RR wheel
3) Throttle response is nil. I can floor the pedal and it acts like no gas is given. When there is any response, the Pedal Position parameter maxes out at 20%.

I am going to give it one more day to see if the CEL comes back.