Thread: Intermittant loss of throttle response Puma 2.4

Originally Posted by Brid

Not sure. The engine malfunction light didn't come on, so I would think not (could be wrong of course). I didn't think to check the scan gauge, but so far it has only identified a fault code when the malfunction light comes on.
Will advise if & when it is sorted.

Not all fault codes trigger the MIL, so check with the scanguage and you can look up the code(s) here: Diesel performance tuning and economy remap chip tuning for Landrover Defender Discovery TD5 Puma TDV6 TDV8 or in the manual.

It could be the throttle position sensor?

watching this thread closely... thanks for the video link.. have actually seen it but alas got bit by the procastination bug

Originally Posted by BilboBoggles

Would the PUMa store codes for overheating, and perhaps throttle pot failure? I would have thought the dealer could locate those codes?

my 2.4 puma experienced this problem twice last month after finishing a dusty track. Got it checked by an independent LR specialist back in melbourne, no DTC found.

Drove thru a bog hole full of water and mud on last Sunday and it played up once just now.

Will check the radiator tmr.

Check intercooler & turbo hoses

The MIL lamp only illuminates with tested DTC's to do with the Emissions control of the engine. The dealers only check the modules for tested DTC's using SDD and not untested or pending DTC's. If the EMS went into limp mode due to overheating then a Tested DTC would be logged in the EMS.
If you have a diagnostic tool check that the accelerator is sending valid position values back to the EMS.

Nanocom:


MSV2


It may be a good idea to remove the accelerator plug and coat the contacts on both the plug and the pedal contacts with electrical contact cleaner. If the pedal readings are constant when you lose power again then you will have discounted the pedal as being at fault and then you can move onto tracing the loom back to the EMS looking for chaffing, shorts etc.

HTH Brian.

Hi Lorryman100,
what if it was a momentary loss? Actually I don't have to stop the vehicle and turn off the engine to get it back to normal. I just depressed the pedal a couple of times and all of a sudden the power came back.

any suggestion to diagnose this issue?

Originally Posted by Lorryman100

The MIL lamp only illuminates with tested DTC's to do with the Emissions control of the engine. The dealers only check the modules for tested DTC's using SDD and not untested or pending DTC's. If the EMS went into limp mode due to overheating then a Tested DTC would be logged in the EMS.
If you have a diagnostic tool check that the accelerator is sending valid position values back to the EMS.

Nanocom:


MSV2


It may be a good idea to remove the accelerator plug and coat the contacts on both the plug and the pedal contacts with electrical contact cleaner. If the pedal readings are constant when you lose power again then you will have discounted the pedal as being at fault and then you can move onto tracing the loom back to the EMS looking for chaffing, shorts etc.

HTH Brian.

First thing I would do is disconnect the accelerator pedal plug and check the pins for contamination then clean it with an electrical contact cleaner. Then a live data check on the EMS sensors along with the pedal position sensor with a diagnostic tool to see if the values corresponded with my foot on the pedal, if it happened again after cleaning the terminals. Also I would be able to check the other parameters as well, MAP, MAF, Fuel rail pressure, CHT and Turbo boost. Once I had the live data then I would be in a better position to say if the pedal was at fault or if it was something else causing the lack of throttle response.

HTH Brian

Is there a way to check the "Pedal Sensor" using the ScanGauge2 ?