MB E290 diesel. DTC P1403.Problem is with acceleration. This problem occured like this. About a year ago while driving i find out that acceleration is poor ant tachometer was going only antil 3000rpm. Three months later this hapened again. And no I am having this problem 3-5 times a day. You should stop the car, turn of the ignition, wait for few second, and then run the car and you can drive for a while. So as i understand its an electrical problem, but it was developing like a mechanical - in slow motion and a long time. I have changed everyting : IAT sensor, MAF sensor, bouth EGR transducers, cleaned and checked the EGR valve (it hold up the vacum for a half an hour). Olso checked all vacum systems (its all ok), all wiring systems (its ok too). And the problem still remains. 10 mechanics have checked and tried to repair my car already - and they all failed. The dtc P1403 stil remains, and the problem remains too. HELP ME SOMEONE.

Prado?
did you mean
Toyota Land Cruiser Prado no year told (1985 to now 2022+) vast years made!!!!
no engine told ,not even gas (petrol) or diesel (28 total) OMG lots.!
engine size not told so there is no answer possible.
on Petrol the ECU/PCM modulates injectors.
diesel is many answers for 37 years, may diesel pumps or diesel ECU.

What make, model an year vehicle ? P1403 could mean something different from make to make .
P1403 - DPFE Sensor Hoses Reversed
P1403 Chevrolet - Exhaust Gas Recirculation System Valve 1
P1403 Hyundai - DMTL Valve Circuit
P1403 Volkswagen - EGR System Control Difference

Use an ohmmeter to check your spark plug wires all have very close to the exact same resistive value

on its own
seem like you need big time help in a real shop if it does that.
we dont have KB here in usa.
so i cant guess your drive train at aLL. 2.0l:?
Petrol engine
or Diesel.
we cant guess that either. nor the year.
or if its direct injected diesel.
see? all know know is the body type. zero else.
scan it yet?

that be like first.
the DTC errors are huge clues.

change filters yet, that be way before sensors.

This answer is coutesy of expert ZL Limited

DTC P1275 - Acceleration Position Sensor 1 Circuit Malfunction
The acceleration position (AP) sensor circuit provides a voltage signal relative to acceleration pedal angle. The acceleration pedal angle (AP1) will vary about 13% at idle position to about 87% at wide open throttle (WOT). This code detects a continuous short to ground or high in either the circuit or the sensor.


Conditions for setting the DTC:
* The Ignition is "ON".
* The acceleration pedal angle is less than 2.5% or more than 97% for 12 counts within 500 test samples (15.6 m sec ).

Action Taken When the DTC Sets:
* The PCM will store condition which were present when the DTC was set as Freeze Frame and in the Failure Records data.

Conditions for Clearing the MIL/DTC:
* The PCM will turn the MIL "OFF" on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
* A history DTC P1275 will clear after 40 consecutive trip cycle during which the warm up cycles have occurred without a fault.
* DTC P1275 can be cleared using the Tech 2 "Clear Info" function or by disconnecting the PCM battery feed.



Diagnostic Aids
An intermittent may be caused by the following:
* Poor connections.
* Mis routed harness.
* Rubbed through wire insulation.
* Broken wire inside the insulation.

Check for the following conditions:
* Poor connection at PCM-Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
* Damaged harness-Inspect the wiring harness for damage. If the harness appears to be OK, observe the APP sensor 1 display on the Tech 2 while moving connectors and wiring harnesses related to the sensor.

A change in the display will indicate the location of the fault. If DTC P1275 cannot be duplicated, the information included in the Failure Records data can be useful in determined vehicle mileage since the DTC was last set.

If it is determined that the DTC occurs intermittently, performing the DTC P1275 Diagnostic Chart may isolate the cause of the fault.


Referential sensor location.

Hi, the DTC P1121 sets when a problem has occurred in the accelerator pedal position sensor. I would recommend you take it to your nearest Toyota dealer.

I have exactly the same problem with my MB E290TD. The same DTC, also changed MAF, also need to torn of the engine for 5-10 sec to get the engine running well. And I checked all vacums - they are all good.
Also I have changed egr transducers (both of them) for two times, didnt helped.
Cleaned and checked for holding vacum EGR, good - didnt helped.
It seems like a mechanical problem that affects the electronic seestem - but i can not figure out what ir is.
The strange thing is that you can tur engine on in the morning and it can imediatly cach the foult. But there are days that you can drive all dai long and the car will run fine. That pises me off. Because I have done everything that can be done - but NO ONE can tell the exact explonation of the P1403 (exhaust gas recirculation - HFM-regulation). Every explonation is a quess.?

sounds like a turbo problem. take it to a good deisel specialist. if it's not out of warranty, take it to jag.

Hello there! Here is a break down of the majority of the codes you posted and an explanation.
First of al the P1402 + P1403+ P0441 are all connected.
P1402- DMTL Motor Circuit
P1403- DMTL Valve
P0441- Gross evaportive emissons leak (of the least concern of all codes)
P1402 +P1403 are both in connection with the Charcoal canister. Generally over fueling a vehicle cause these codes. Hyundai's are particular prone to this issue due to emissons control locations. Simply put a DTML is a sensor. There is 2 of these particular ones on your car. One mounted at the engine and one connected to the throttle body. Fuel more than likely has contaminated the charcoal canister. If only one of the codes were set i'd assume it was just a wiring issue. More than likely the canister and solonoid need to be replaced. Obviously checking the wiring should be done first. Corrison or a broken wire also could cause these codes to trip.
P1632- Transmission Temp Pull-Up Resistor issue. I am not a Hyundai Tech so I don't have allot of experiance with there transmisson codes. However the same code with same function is listed on the F-body site(GM). I would correct the other 3 and go from there. I assure you that poor engine performance would definately cause transmisson issues, especially with the shift points. Especially with a transmisson like yours that is totally electrically controlled. Please let me know if any of this makes more sense. If need be I can elborate more.

00-30-001 2000 ACCENT DMTL DIAGNOSIS: DTC CODES P1401, P1402 AND P1403

p1402 - dm-tl air pump motor is shorted or disconnected.

2000 model year accent is equipped with a new enhanced evaporative emission system. this new system is capable of measuring leaks as small as 0.020" diameter. the new system pressurizesthe evaporative emission system with a diagnostic module for tank leakage (dm-tl), while the previous model's system appliedengine vacuum through the purge valve to detect system leaks.

service information
vehicles that have the check engine light illuminated and have dtc p1401, p1402 and p1403 stored in the ecm should have their electrical systems diagnosed related to the appropriate dtc. these codes are not related in any way to an evaporative emission system leak. the conditions that set the diagnostic codes areas follows:
p1401 - dm-tl air pump motor current draw is higher or lower than expected (normal = 17-36 ma).
p1402 - dm-tl air pump motor is shorted or disconnected.
p1403 - dm-tl changeover valve is shorted or disconnected