A bit of a diagnostics walk through today, my Dad’s car (Zafira A) sprouting some confusing problems…
First things first, if you own a Vauxhall and have an engine light on do yourself a favour and get a live data retriever like what you see above. Why pay more for a garage to scan the car once when you can have a £20 reader that will probably outlast the car.
So it all started with the exhaust system, the factory down pipe flexi had failed and was blowing a lot. Purchased a new down pipe and a new o2 sensor to save the hassle or removing the old one out of the original down pipe. Everything was replaced pretty easily though once the car was started we had two codes: P0170 and P0136…
P0170 – Lean Exhaust
This code was not too tricky, and since the middle silencer and muffler had only been replaced by a garage on the last MOT I was not expecting this at all. After a few minutes I found a hairline leak from the welded side seam off the middle silencer, so a very poorly made silencer right here ! Luckily I was able to seal this defect using VersaChem.
P0136 – O2 Sensor 2 Open Circuit
This one was a bit trickier, I got an open circuit issue now ? somehow ? First things first and that was check the sensor itself. The first thing you can do on the four wire o2 sensor is check continuity and resistance in the heater circuit, which are the two white wires off the sensor:
Set multi meter to “ohms resistance” and connect to the white wires at the four pin terminal connector, you should be able to get a confirmation beep and numbers around 04.5Ω.
Next you will check the voltage range of the sensor, this is typically 0.2 to o.8 volts as you apply heat to the sensor (best done with a blow torch).
Here I recorded a video to demonstrate how you go about doing this, you will go into “Volts DC” for the meter and connect up to the grey and black wires at the terminal this time. Apply heat to the end of the sensor and see if you get a steady voltage climb, as you can see this was not the case for me, so the sensor was faulty !
Since I researched how to check the harness I will also highlight on this:
Before you go any further make sure your vehicles ignition is off !
For the Zafira A / Astra G (Z16XE) the engine ECU is located on the right side of the cylinder head next to the battery, and you should see two rather large black connectors coming off it. You have the upper harness connection and the lower harness connection, you need to unlock the top connector (known as connector X72). You simply do this by easing out the plastic slider (no.48) and then the big metal hinge will unlock for you.
We need to create a circuit testing ohms resistance with the meter connected to the X72 and then right down to terminal 3 on the o2 sensor connector (wiring harness side). You need to use a fine needle probe to pin 62 on this plug, so just two along from 64 as you see on the diagram. To connect to terminal 3 you will obviously need longer wires, speaker cable is pretty ideal especially combined with block connectors (look at the you tube video above to see how I did my “DIY” leads).
Once connected you should get a low reading of around 0.3Ω and confirmation continuity beep.
A few final tests can be carried out at the 4 pin o2 sensor connector (harness side):
o2 sensor disconnected: Ignition On / Terminal 4 (black) Harness Side to Ground = 400-500mV
o2 sensor connected: Ignition On / Terminal 4 (black) jumper Harness Side to Ground = less than 50mV
This sums up all the testing you can do, other things are if you have a live diagnostics reader go into the measuring blocks and see what kind of mV readings you are getting. The sensor should change every second, and on this bad sensor it was always stuck at 447mV or 453mV so definitely an issue. There is always the unlikely case your ECU is at fault, it is rare but it is known for them to fail since it’s effectively attached to the engine and experiencing a lifetime of noise, vibration and changing temperatures.
With the work carried out you would think that would be the end of it, but not in this case. A day after the car developed a bad misfire out of nowhere and we had codes:
P0300 – General misfire
P0303 – Cylinder 3 misfire
It seemed very strange that this would happen, and I initially thought it might be linked to all the wiring tests I had been doing. It turned out the car battery was failing, only delivering 7volts when cranking which is not ideal for any car. The sealed Vauxhall battery was at least 10 years old so that was replaced, I swapped the spark plugs out for some spares and no joy, so it was onto the Coilpack:
Here is a good video for testing the coilpack, and after replacing the unit the car was all good again, finally fixed !
Happy New Year !
Here is a personal fave that I took a week or so ago. This is a four image merge into HDR which has ended up looking some ND filter due to the soft wave overlaps. I’ve submitted it into the Flickr ‘your best shot 2015’ pool and it’s proven to be very popular, so I hope you all like it also.
Back to college next week and I’ve just been sorting out my LV08 chassis assignment this evening. Hopefully I can get that marked off then it will be more workshop related tasks in the new year which I can share on the blog.
2015 for the college blog has been pretty steady, nearly 200 genuine followers and regular commenters must mean I’m doing something right. It’s clear the site has moved over into more of a photo hobbyist gallery, but since college will finish around June 2016 I will probably carry this on as a photography blog primarily.
I would like to note a few of my favorite blogs this year:
Jazz You Too This has been a great source for alternative listening and generally chilled out tracks.
Ray Laskowitz The Storyteller, a great variety of photos from Ray, many thanks.
Drakes Doodles This site is really interesting, simple doodles of art it’s really worth following !
Playing With My First DSLR Camera Well known blog for macro and close up photography, great for ideas yet I just need to get a better close up lens now !
Colline’s Blog I’ve really enjoyed this blog about the perspectives of teaching, with it’s challenges and rewards it’s been great to follow this year.
Tim Scribbles A car show blog from the US that I enjoy very much.
THE MAD MOVIE RANTER Useful site for knowing what films to check out and the ones to avoid. It’s really that simple !
Forgotten NZ Abandoned places in New Zealand and around the world, I’ve been following this site since I started my own blog and it’s really cool.
Marc Aerophoto Marc will always be joking to me about something on my blog, but you just cannot beat taking photos from the sky ! Marc has been helpful with what to get for my camera so a special thanks to him !
There are many more blogs I can think to include but I need to carry on with my assignment, and why are people doing fireworks already it’s only 21:00PM !