Ford Repair Questions? Ask a Mechanic for Answers ASAP
Thank you for your in depth response. I do however, have a number of questions, and would greatly appreciate your input.
Just to confirm I have the dpf with the additive tank.
Is the software programmed to continuously attempt a regeneration if the cycle fails? I would think that it would stop attempting to regenerate after x attempts, and just give PCM alarm "regeneration period"?
I had a fault a number of months back for the fuel cap filler sensor, but my mechanic just cleared it without investigating. Could this contribute to the problem?
If the cycle is failing because of a sensor/actuator, would that not show on the PCM as a fault? i.e. if the turbo is faulty, would that not show? If the EGR is not stuck or faulty, would this show on the PCM? Same question for glow plugs and all sensors?
I had to replace the rubber tubing on the turbo inlet in August as this had split. The part came with a new MAF. Does this need calibrating? Could this be delivering too much/too little air?
Do I have to replace the dpf to diagnose the problem as the mechanic can't diagnose the problem without the car running?
Can you please list the other sensors that control the regeneration cycle please? temperature sensors etc..
I had the static regeneration done by a local mechanic no problems. As soon as I got home I checked with the Forscan if this "dpf regeneration duration" alarm was still on: It was (P2458 - this doesn't show as an engine malfunction on the dash). I drove for 20 minutes to monitor the regeneration cycle, and unfortunately there has been no change: The dpf regeneration cycle is stuck repeating itself every 10 minutes or so. The dpf doesn't even need regeneration. Any thoughts?
DPF sensor has been checked and confirmed ok by the main dealer, the regeneration cycle constantly trys to repeat itself while driving even though the differential pressure doesn't exceed 16kPa.Fault P2458-61-PCM is not showing as an engine malfunction on the dash but is constantly present on the PCM. The ford dealer also tried to reprogram the PCM, and tried a de-install/re-install, but to no effect, fault still present.
Thank you for the reply, it's reading 0.9V at 3000rpm, they say at 1.3V it goes to regeneration. But mine just keeps regenerating!
Thanks, ***** ***** it the static dpf regeneration cycle completes itself successfully, but the forced regeneration doesn't? If there was a fault with any of the components mentioned above, would they not interrupt the static regeneration also? I had a static regeneration done successfully, and haven't measured dpf sensor voltage since, but can see that it drives with a value no greater than 15kPa, whereas before static regeneration it measured 25kPa under the same conditions.
Hello, can you tell me where the PCM is on the 1.6tdci 2009?
Hello, I checked the voltage it's reading 0.6Volts at 200rpm when the car is stationary. Seems OK? Just because the sensor is ok at the reference condition, does this also mean that it perfoms well/accurately under loaded conditions. The voltage can't be tested under a loaded condition, that's when this fault appears. I saw this faulty occuring when the pressure reached 7Kpa on the Forscan software. This happened repeatedly. (see attachment). I underastand 7kPa may not be the true vale, but something is happening that is causing this fault to appear and initiate the aformentioned repeated regeneration cycle. You may say that this is the loading value on the dpf that initiates the cycle, but why does it re-occur. Shouldn't the PCM just attempt one (or two) cycles, then the "P2458 - regeneration period" fault appear.
I'll try a new sensor just to eliminate this as a cause. Are these plug and play or do they need calibration/configuration??
I appreciate your continued support,
Thank you, ***** ***** regeneration is started because of a high differential pressure across the filter, why does the alarm "P2458 - Diesel Particulate Filter Regeneration Duration" appear immediately (I..e at the beginning of the regeneration)? Should it not appear after a set duration when if fails to detect a reduction in differential pressure? Is it normal for the PCM to log this alarm at the beginning of a regeneration cycle, like it is doing in my case?
Thank You, ***** ***** Forscan is inferior to the IDS software, but I can clear the P2458 fault, and drive fine without any DTC until I reach the 7/8Kpa on the dpf sensor. Then the "DTC Count" parameter goes from 0 to 1, and P2458 appears immediately.
The P242F fault only came up once and, after static regeneration, was cleared and has not come back. That said, I haven't been driving the car, only for diagnostic purposes!
When I brought the car to the ford garage with P2458, they could not clear this DTC using IDS, and spent the full day trying to diagnose the problem. They were even unable to perform a static regeneration. It was only when the filter blocked (P242F), that a local mechanic did a static regeneration. Ford did un-install and re-install the PCM.
Because of all this I am wondering is there a fault with the PCM and it needs replacing?
Thank you, ***** ***** confirm definitively that its is normal for the PCM to log P2458 at the beginning of a regeneration cycle, and not when the set duration has elapsed without successful regeneration?
It would seem logical that, since the DTC descriptor is "Diesel Particulate Filter Regeneration Duration", it would wait until the set time for duration has elapsed before logging the code?
I have driven on the open road for a prolonged period, but have seen the regeneration continually repeat itself every 10 minutes.
No Forscan doesn't give a "regeneration in progress" status, but I see the EGR valve shut to 0% and EGT rise to 600degC, it normally runs at 200-250degC.