Diagnostic software

[Rawze]

(04-23-2021 )Truckdriven Wrote:  I am a mechanic for a very mixed Fleet operation...

well, I was sent a program for a CM2250 engine today for review. Sure enough,... it is another typical rip-off bad delete file. Here is the details....


  20210512-Review Worksheet esn79502726d.pdf (Size: 50.21 KB / Downloads: 167)

Summary:

* This program lacks any necessary corrections to engine operating mode control logic. Many of these modes deal specifically with exhaust device (DOC/DPF/SCR element) heating, and they are all still active. With no editing of the engine mode control logic, the engine will continue to enter one or more of these operating modes resulting in the engine creating extra heat in the exhaust all the time by way of over-working the turbocharger and cylinders in attempts to warm up an emissions system that is no longer present. This is harmful to both the engine and the turbo, causing higher than normal friction all the time, significantly shortening engine life. It should be noted that this mistake/oversight is one of the most common (and most damaging) mistakes that is seen in bad delete programming.

* The actual engine power and torque are set considerably higher than what will show when connecting to the engine with the Insite or other diagnostic software. Although it is withing the engines ratings, It will deceptively show 450HP and 1650-ft.lbs … however the actual engine power/torque is set at 540HP / 1960-trq. Some of this power is derived by someone editing the flywheel torque settings, and some comes form editing injector quantity settings to fool the ecm into placing more fuel into the cylinders in an uncontrolled manner. This clearly shows a lack of someone altering power levels properly.

* The injector quantity vs. power has been edited deceptively. This leads to the ecm placing more fuel into the cylinders that it can account for. The result is loss of proper cylinder balancing, the ecm will lie and report higher fuel mileage numbers into the dash of the vehicle that are higher than actual. It also adds power/torque that the ecm cannot account for. This is one of the worst possible ways to edit the engine combustion cycle towards power, torque or other gains and is completely unnecessary, as there are proper methods that can be used.

* Engine restart limiters are still in place. This could potentially lead to a shutdown and prevention of engine re-starts without any warning. Considering there are also several codes blocked for the EGR system, this could lead someone towards incorrect diagnosis, and to believe the ecm has failed if it ever does this.

* Many of the engine Derate limiters are still in place. This can lead to unknown power/torque losses, and is likely the reason someone deceptively edited injector quantity vs. fuel. It shows a lack of understanding of these systems and how to properly switch them off.

* No proper removal of auxiliary Emissions has been done. This leads to inconsistencies in engine operation and power levels. Amonia and Nox gas combustion clamping is still in place for all engine operating modes. With the emissions systems removed, the engine will try to control these directly by altering the combustion cycle heavily... leading to unpredictable power/torque, and other issues.

* The injection timing has been edited incorrectly for the missing egr gas and is not at very harmful levels. It is in excess of 8+ degrees too far advanced in the active engine modes and will lead to high internal cylinder lateral friction, eventual liner fretting (on wet-liner engines such as the ISX, ISC), and eventual head gasket failure. It can also result in the engine suffering a sudden failure due to a cracked piston or failed wrist pin.

* The turbocharger has NOT been re-programmed for proper fuel-air mix with consideration to the missing egr gas. This will lead to the engine running too lean all the time and a shortened engine life will result.

- Overall, this program is moderately harmful to the engine and its turbocharger. This could lead to the engine unpredictably jumping engine modes and causing things like unstable conditions, power losses, silent ghost derates, possibly an over-spooling VGT turbo, inefficient combustion, excess exhaust heat produced and a shortened engine life due to incorrect injection timing, and improper fuel-air-mix. Combine all this together and this program is a recipe for disaster.

-- Welcome to the bad delete club.