Proper Testing For Air Intake System Leakage
The turbocharger on the dCi6 engines in Mack Freedom model chassis use an outlet adapter that cannot be checked for leakage by conventional methods. The following method can be used to investigate low power complaints or when performing similar diagnostic procedures:
Engine Electronic Control Unit Flash & Reprogram
Mack has warned that before replacing an engine ECU on an E-Tech or ASET engine for any reason other than an “engine cranks but does not start” condition, the control unit must be flashed and reprogrammed without saving customer data.
All customer data must be entered manually when the process completes. The flash and reprogramming is necessary to ensure that the issue is module-related and not program-related.
Note that if the reflash fails and “Error 74” occurs, upload the verification file to V-Mac Online. Also verify that the fuses for all other control units have been removed and then attempt to reflash the engine ECU a second time. If the second reflash fails, stop and contact the company’s reliability engineering department for further instructions.
For ASET AC engines the VTG actuating system must be recalibrated for proper operation following the reflash/reprogramming procedure, or whenever parts are replaced or when certain diagnostics are performed.
Monitor the actuator during calibration to ensure that full stop-to-stop travel is achieved. A failure to calibrate the VTG actuating system could result in performance issues, or logged VTG and/or EGR codes. Perform recalibration during any of the following circumstances: Turbocharger replacement, engine ECU replacement or reprogramming, VTG actuator replacement, actuator control valve replacement, active or inactive 4-5 or 4-9 fault codes with an FMI of 7 and complaints of low boost.
Alternative Wheel Removal & Installation
Hendrickson calls for the complete removal of the tee fitting from the hubcap when removing the wheel assembly from the suspension.
