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Questions tagged [diagnostics]

Use this tag for generic questions related to tools, techniques and methodologies for diagnosing problems. Do not use this tag for case-specific problems, the "troubleshooting" tag is better suited for that.

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2answers
35 views

What things cannot be tested(except by elimination) when trying to diagnose a sluggish engine?

As far as I'm aware there are certain things that cannot really be diagnosed if you have a sluggish engine and so you can only find them by elimination. As an example if you test a car due to ...
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1answer
45 views

What things are tested during a diagnosis for a sluggsh engine?

I enquired at both dealer and garage about diagnosing my car for being a bit sluggish and less peppy. Both said it usually takes one hour to find the problem\narrow it down for such a matter. I'm ...
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1answer
39 views

How difficult is it to collect obd commands ?Will it be different for different brands?

OBD is something very interesting I found these days.Thanks to this repo https://github.com/pires/obd-java-api & wikipedia which provides the basic information of PIDs.But there is a lot of ...
8
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1answer
361 views

Exactly how much refrigerant is in there?

A concern that comes up regularly when troubleshooting A/C problems is whether an A/C system has too little refrigerant (hello leaks) or too much of it (hello overcharging). The traditional way to do ...
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0answers
19 views

Replicating a OBD Reader cable

I've got a broken cable used to interface between a diagnostic tool, and an OBDII interface. It's made with a 25-pin serial connector, converted to the OBDII connector. Does anyone have a resource ...
2
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2answers
23 views

Need Help Diagnosing and Fixing my Kawasaki Ninja

First time poster here. I have a 2010 Kawasaki Ninja 250 - this is a bit of a story and I try and keep it short. A couple weeks ago my bike was having trouble - when I would rev the engine in low ...
0
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1answer
39 views

My Octavia 1.9 TDI 2004 not won't cross 120km

My car would not cross 120 km. What is the problem? What is maximum speed of the 2004 Octavia 1.9 TDI engine superup
2
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1answer
70 views

Are mineral oil smoke test machines sensor safe?

So there's heaps of DIY smoke test machines demonstrated around the web. I learned to built one of these, was kinda fun. It worked, even found a crack on my air intake that was messing with the ...
3
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1answer
68 views

Need help with diagnosing weak AC on ford explorer

2007 Explorer has weak AC. When driving at speed, the AC can produce reasonably cool air. When stopped at traffic lights or such, the air warms to ambient temps rather quickly. I hooked up the ...
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0answers
39 views

Check engine light won't stay off

I've attempted to get my check engine light fixed a couple times and at each repair facility they've scanned the code and told me it was a bad oxygen sensor. I had the oxygen sensor replaced at both ...
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3answers
52 views

Brake problems with 1991 Toyota Celica

I have no brakes. I have bled the brakes, changed the pads and calipers, brake hose. The front driver side bled with no problems but the passenger won't. What else could it be? I've also replaced the ...
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0answers
316 views

Replaced transmission now car wont start

Had my transmission replaced drove car for three days now it won't start. Lights and radio work. No crank no start. Replaced battery, starter, and starter relay. PLEASE HELP HAVEN'T HAD MY CAR A YEAR ...
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0answers
70 views

2006 Mazda MX-5 P0126 + B1318

2006 MX-5 57k Miles USDM 2.0L 6-Speed P0126 and B1318 Set but no light on/Sporadic illumination. Coolant reservoir is full. https://www.obd-codes.com/p0126 That site references that there's a TSB ...
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2answers
138 views

Toyota Vitz 2007: Can a vacuum leak lead to PO171

In my Toyota Vitz 2007 (Yaris in some countries), I sometimes get a PO171 (System too lean) trouble code when the vehicle is idling in a traffic. When my mechanic scanned the vehicle for trouble ...
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2answers
68 views

Electrical Diagnostic Procedural Lists [closed]

Post your general/specific Testing/Diagnostics Procedural Lists for Automotive Electrical Systems. These procedures are intended to target vehicles with modern 12V systems. The format of the site ...
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0answers
24 views

What can be tested with a smoke tester?

I'm curious what all the distinct and separate compartments that can be tested with a smoke tester. So far I've heard of... Intake EVAP Exhaust Combustion Chamber (when valve cover is removed) Does ...
3
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2answers
84 views

Developing an OBD2 application - Engine Warning Lights

I am currently developing an application which retrieves diagnostic trouble codes from my car's OBD system and display any DTCs in a list. However, as my car has no trouble codes I am unable to test ...
3
votes
1answer
37 views

Diagnostic connector broken; wires corroded and pulled out of the housing

1990 f150, XLT Lariat. Has been having idling issues, and the check engine light flicked on. I went to try and pull codes off, and realized that the wires inside the diagnostic connector had corroded. ...
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2answers
3k views

DTC checking while engine running

Why it is said that DTC (Diagnostic Trouble Code) should not be checked when the engine is running?
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1answer
835 views

Sniffing the CANbus on an Audi A5

I've asked a similar question before: Connecting to car CANbus Unfortunately I haven't progressed much. The first product I tried was a CANLogger 2000, I got nowhere with it, so I sent it back. ...
1
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2answers
817 views

OBD-II Fuel type and level of Monofuel Cars

I'm making an application like Torque and i have some issues with commands of Fuel Type and Fuel level with cars that use only one type of fuel like, Only Diesel or only gasoline. With car Bifuel ...
2
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1answer
1k views

Infrequently sticking clutch in 08 VW GTI

I have owned my 2008 GTI MKV FSI for the past 4 years. For the first ~8k miles (bought at 42k), everything behaved as expected and performed nicely. At a certain point around 50k, I noticed that the ...
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0answers
137 views

How do I diagnose a blinking overdrive off light on a 2001 Ford F-150 with 4R70W transmission?

Today the "OFF" light on the transmission shifter starting blinking on my 2001 Ford F-150. It is the 4.6L with a 4R70W transmission. I pulled the codes but all I found was "Evap system inoperative" ...
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0answers
103 views

Not receiving multi line response ELM 327

I am sending the following commands to my Hyundai i20 2012 model (OBDLink SX Bluetooth device): AT Z AT H1 AT L1 AT S1 AT AL AT SP6 AT SH 7D1 18 00 FF 00 The response I am getting is 7D9 10 0B 58 03 ...
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0answers
189 views

Volvo c30 ABS issues

Car specs: Volvo C30 D5 SE(geartronic) R design I have an issue with my car where i will be driving along without an issue and all of a sudden the warning triangle will come on and displays the ...
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1answer
117 views

How do I diagnose trouble code P0567 OBD-II in my car and what are its causes? Which component of cruise control system should be checked first?

I am getting issue with my car's cruise control system, and while diagnosing, this code is shown, I want to know the reason and meaning of this code.
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1answer
2k views

Why does my truck die when I have the ac running?

So my 2003 Chevy Trailblazer dies when I have the AC running. When I'm idling mostly (at a red light or stop sign) and it's died a couple times while driving at a low speed (thru a parking lot). ...
3
votes
1answer
77 views

Safe rounding of CCA during battery load testing

How do you determine the safe amp load of a battery tester? I am looking at testing a battery on a 2012 Mazda 3 sport which has a Mazda factory battery 75D23L (52). The service manual states in the ...
2
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0answers
31 views

Illusive evap code - Hard to find the issue

98 Honda Civic Ex. For a while now my car will throw a p1456 evap code but sometimes it doesn't and the system completes the test. I'll randomly hook up my obd2 scanner and it'll either have a ...
1
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1answer
9k views

What could be causing a grinding noise when car accelerates quickly?

My son is an hour away and we are trying to diagnose this problem on a 2001 Toyota Corolla. When the car is accelerated slowly and gradually everything is fine. However when the gas "pedal is to the ...
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0answers
31 views

98 Chevy Malibu 2.4 liter has fuel and fire but will not start

98 chevy malibu 2.4 liter .Has fuel to injectors and fire to the plugs but won't start?
2
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4answers
2k views

Suzuki sv650s will not start, no lights, no fuel pump, nothing

My sv650s will not start at all. I put the key in the ignition and turn it on and none of my accessory lights come on and the fuel pump doesn't engage. It's done this before and I fixed it originally ...
1
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1answer
62 views

Skoda Fabia 2005: what I need to know to buy a diagnostics machine?

I'd like to buy a diagnostics machine for my Skoda Fabia 2005. My issue is I'm absolutely newbie on this. I don't know which cable connection requires, if there's some standard, ... Will you provide ...
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0answers
859 views

Why does my gas engine sound like a diesel?

I have a 2011 Chevy Impala 3.9L police package car. I've had to issue with the engine running rough, stuttering, burning oil etc...but, when I am at idle, parked, or in traffic; I can hear a very ...
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3answers
3k views

Best practice to tell if an interference engine has bent valves?

I have a 2003 Mitsubishi Galant 2.4L SOHC engine with 251k miles on it. While I was driving it all of sudden the engine just died. I pulled off the road and then had it towed to a local mechanic. ...
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0answers
224 views

Peugeot Satelis diagnostic plug diagram needed

I am want to connect my scooter to OBD II but I need a diagnostic plug diagram to do so. My Satelis is from 2008 and this and newer models should have CAN BUS.
3
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1answer
1k views

How To Diagnose 3rd Brake Light (Without Proper Equipment)

I have a 2012 Ford Focus (sedan version). The third brake light stopped working recently and I'm trying to determine if the problem is with the light itself or inside the vehicle, but a I have very ...
3
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3answers
171 views

Simple fool proof way to identify Bank1 and Bank2 side

Is there a simple and fool proof way to locate which "side" of the engine Bank1 or Bank2 is on, with reference to OBDII data? For example, you read ODBII live data and find that Bank2 Sensor2 (...
2
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0answers
79 views

Air conditioning hisses, but gauges show pressure, no cold air

So my 2010 VW Routan's (basically a Dodge Caravan) AC has gradually stopped working. I figured I had a small leak and it finally just didn't have enough juice to cool. I have a set of gauges that I'...
2
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1answer
4k views

2011 Jeep Compass No-Start

Car comes in with the complaint engine cranks doesn't start. Confirm the complaint and check for codes, P0688 - ASD Relay Control Sense stored in memory. After doing a quick fuse check I found that ...
3
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0answers
133 views

What does muddy transmission fluid indicate?

I'm in the process of pulling out the engine & transmission from my Lumina (progress here). The picture below shows the state of the transmission fluid. It has a slightly grainy texture to it. I ...
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1answer
34 views

When connecting diagnostic PC to OBD port - What is the most detailed output file?

When the garage connecting the "official" manufacturer software to the OBD port in the car - What is the most detailed file that can be retrieved, containing all the raw data information? Thanks,
4
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2answers
935 views

Is there a diagnostic that can be done on a used hybrid car's battery pack?

I'm looking at a used hybrid Lincoln MKZ with 70k miles. The manufacturer provides an 8-yr/100k mile warranty on the hybrid system, so I believe I should still be covered until 2019. I've read that ...
7
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1answer
103 views

Is an injector an injector?

In general terms at least - lately the engines I've been working on are diesels and I've never had to troubleshoot fuel injection problems on gasoline/petrol engines. So, I'm wondering, how many ...
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2answers
1k views

P0300, P0302, P0303 on 2003 Honda Civic 1.7

I'm in the process of helping someone with their 2003 Honda Civic, 1.7L engine, 161k miles on the clock. Pulling the codes from the vehicle I got three specific codes: P0300, P0302, P0303. The codes ...
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2answers
69 views

OBD reader returning “0 Codes” way too fast?

Normally, when I read my '07 Hyundai Sonata, the reader takes about 10 seconds and then returns "0 Codes" (or whatever). However, I just was checking out a 2010 Sonata. I hit Read and it popped up "0 ...
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2answers
2k views

Why does Honda Civic 05 overheat when water reservoir gets full?

My father in law's Honda Civic overheats when the water reservoir is full or to the top. He is wondering what could be the problem if the radiator needs water when the reservoir is full. The ...
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0answers
517 views

Check engine light is on but no codes provided when checking with reader [closed]

I have a 2004 Chevy Trailblazer. My check engine light is on, but I'm getting no codes when checking with reader only blank screen. How could this happen?
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4answers
143 views

Basic Automotive Maintenance Repair - Compiling a Toolset

I am looking into getting more serious about doing my own automotive repair and maintenance, and am working toward gathering the appropriate tools. However, I am admittedly can be a bit of an ...
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0answers
282 views

Help !!! 2007 Honda Accord 2.2 diesel not starting intermittently

my Honda Accord has developed an issue where by sometimes it fails to start when the key is turned, it will turn over but not start, the green key light stays Stays flashing on the dash, does this ...