The existing control valve and filter shutoff valve assembly will no longer be assembled on production engines but will remain available as Service items only. The engine serial number first for engines built with the new components is 79031440
The new, Turbocharger Control Valve - Low Mount, system will not require an air filter. However, the vehicle must be equipped with an air dryer to meet engine installation requirements.
The vehicle air supply will be plumbed directly to the turbocharger control valve at the inlet port .In addition, a new electronic control module (ECM) has been released with circuit changes to accommodate the new turbocharger control valve logic. The new ECM is a CM870, Part Number(NNN) NNN-NNNN and can be used on previously built ISX CM870 engines. However, the existing ISX CM870 ECM, Part Number(NNN) NNN-NNNN is not forward compatible and can not be used in conjunction with engines assembled with the new turbocharger control valve.
As with previous ISX CM870 engines, the electronic control Module (ECM) sends a pulse width modulated (PWD) signal to the turbocharger control valve to control the variable geometry actuator mounted on the turbocharger. The turbocharger control valve modulates air pressure to the variable geometry actuator on the turbocharger. Thus, as the signal increases, more air pressure is applied to the variable geometry actuator.
A new engine harness is required to interface with the ECM and a new air control line is required to interface with, the turbocharger control valve and the VGT turbocharger.
The new turbocharger control valve has two new Fault Codes:
- Fault Code 2384 VGT Actuator Driver Circuit - Voltage Below Normal, or Shorted to Low Source
- Fault Code 2385 VGT Actuator Driver Circuit - Voltage Above Normal, or Shorted to High Source
The wiring diagram,(NNN) NNN-NNNN03, has been revised to reflect the new circuitry of the low mount turbocharger control valve. It will also include specifics on the new fault codes, 2384 and 2385, associated with the new low mount turbocharger control valve.
you should makemsure the correct calibration is in the ecm for the05 engine. you will have problems if the 03 calibration is contorling the 05 engine, and the correct code for this engine to run properly is