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Discussion Starter · #1 ·
Hi all, is anyone familiar with using an OBD2 module and the Torque App on a 2.0 Diesel Cruze ?
I bought one of these modules recently to reset the fault codes and monitor performance as the car will intermittently go into limp mode (code 84) while driving along. Typically it will happen while coasting to a stop. I reset it and all is fine again for the short term.
When stopped and at idle, monitoring the Throttle Graph (showing in percentage) on the Torque App, it is showing an unusually high and fluctuating throttle position even during idle at 800 rpm. I would of thought the graph would be sitting flat around 10% but it's more like 50% and fluctuating. If the accelerator is pressed just a little, the graph spikes to 98% and then resumes fluctuating around 50%. This carries on for about 2 minutes then the idle increases to 900 rpm on its own and the thermo fans come on...
This issue is driving me nuts!!!
I have cleaned the throttle body even though there was very little soot, cleaned and checked the Mass Airflow Sensor (MAF), disconnected & reconnected the battery, Engine Control Module and the Accelerator Pedal Position connector.
The air filter and fuel filter have also been replaced with a genuine products.
The most obvious answer would be the throttle position sensor however it is stupidly molded into the throttle body itself and Holden quoted $690. This is an expensive fault finding exercise and hope I don't have to go down this path.

If anyone can shed some light with their experience using the OBD2 and any thoughts on what is going on, it would be very much appreciated.

I have a video but can't post it so have attached a few snap shots.
 

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That certainly doesn't look normal to me. This would be the first I've heard of a bad TPS, but that doesn't mean it isn't bad.
 

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Discussion Starter · #3 ·
True. I'm not all that familiar with turbo diesels but I would expect the throttle position graph to be flat at idle and rise and fall with a linear curve. To test this theory I connected the OBD2 to my V6 VE Commodore and the graph was flat at idle and the curve linear when revved.
Who knows, is it the TPS or something else feeding erratic signals into it...
 

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Discussion Starter · #5 ·
Actually it did do a regen on the way to work this morning. Cruised at 120km per hour at about 2400 rpm and lasted about 20 minutes but unfortunately no change to the original issue.
 

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Discussion Starter · #6 ·
Ok I think it's time to take it in to a Holden dealer to get this issue diagnosed and fixed.
Appears to have a hard fault now which is good I suppose - car goes into limp mode (code 84) and the engine light appears simultaneously every time I take my foot is off the accelerator and coast to a stop. I then reset the ECU using the OBD2 module and Torque App on my phone and all is good again until the next time I coast to a stop.
Checking the Torque App graphs, all parameters appear to be normal except for Throttle percentage which is all over the place regardless of the accelerator pedal position.

Has anyone else used the Torque App or similar App on the Cruze diesel and monitored the Throttle percentage graph ?
It would be great to know what other people are seeing on this graph at constant speed and how the curve changes when accelerating and decelerating ?
 

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Discussion Starter · #7 ·
The issue is fixed and would you believe it was a blown intercooler. Check out the photo, I'm surprised it ran at all...

WP_20150920_20_44_55_Pro[1].jpg
 
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