The letter received refers to "electronic throttle body may develop Contamination"
Anyone one know exactly what that means? I feeble mind can only wrap around fuel mixture interaction with the medal Throttle Body causes this contamination that "fouls" up the Throttle Body causing the Computer to sense Engine issues putting it into safe mode when it not an internal ICE issue at all; the only inconvenience if it happens the Vehicle goes to safe Mode rendering the Vehicles top speed of whatever...15/20mph...but other than that, no real damage is, or will take Place. Am I even Close?
If this Throttle is replaced, what will prevent it from happening again? The new throttle body is made from different metals/parts?
Some have written this goes back to 2015....but that CSP reads more like it was/is more Internal ICE than Throttle...... I just resist the tear-down of a factory build although I feel my dealer has competent Service Techs. The C-Max has only been to the dealer for Oil change (after a few cosmetic parts had to be replaced on delivery). I have a 2014 Honda CR-V; its only been to the dealer in 3.5 yrs for 3 Oil changes...and that is it.
Filtered air (plus some exhaust gas via the EGR valve) flows through the throttle body. There is no fuel injection on the intake side of the throttle body. So, either the throttle body was contamined when built / assembled or contamination (dirt / carbon from EGR maybe) is entering the throttle body stepper motor / electrical connection due to a manufacturing defect. Ford doesn't tell us. All Ford says in 16B32 attached below is " the electronic throttle body internal motor contacts may develop contamination resulting in increased electrical resistance." Can you scan and post 17B28 as it is not readily available on the internet yet to compare with 16B32..
If I were you, I'd get it done as Ford can discontinue a CSP at anytime and you may have to pay for a new throttle body if it fails if you are out of warranty.
Like I said in my previous post 17B28 sounds like 16b32 (thanks to Bill-N) attached below. 16B32 exired on 9/30/2017 and did not include the C-Max. The problem identified in both programs apparently is contamination of the throttle body. The fix in both programs is to replace the throttle body.
From the service manual, it appears that the mode of operation if the throttle position is deemed incorrect not controllable is as below:
RPM Guard With Default Throttle
In this mode, the throttle plate control is disabled due to the loss of throttle position, the throttle plate position controller, or other major electronic throttle body concern. Depending on the concern detected, the throttle plate is either commanded to the default (limp home) position or the motor is disabled and the spring returns the throttle plate to the default (limp home) position. A maximum allowed RPM is determined based on the position of the accelerator pedal (RPM Guard). If the actual RPM exceeds this limit, spark and fuel are used to bring the RPM below the limit. The powertrain malfunction indicator (wrench) and the MIL illuminate in this mode and a DTC for an ETC related component is set. EGR and VCT outputs are set to default values and cruise control is disabled.
Edited by Plus 3 Golfer, 17 October 2017 - 04:55 PM.