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Nairaland Forum / Nairaland / General / Car Talk / On-Board Diagnostics (OBD II) - Questions And Answers Thread (54645 Views)
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 9:10pm On Mar 25, 2017 |
I can't buy the sensors from USA because they don't have Avensis verso in USA. I will look around Europe where I can get them cheaper |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 9:13pm On Mar 25, 2017 |
olaboy1: Valid observation. Independently verified. While we attempt to clarify this, please go-ahead to purchase the upstream sensors |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by SmartchoicesNG: 9:15pm On Mar 25, 2017 |
AutoElectNG:I have a car whose obd2 plug cables have been cut... How can I reconnect them? |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by SmartchoicesNG: 9:18pm On Mar 25, 2017 |
I will like to fix the wires to the obd2 port correctly... Please help |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 9:30pm On Mar 25, 2017 |
SmartchoicesNG: Full description of the car so we know what the patient is, and how to approve this case! --------------------- MODIFIED BELOW --------------------- how to approach this case! |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 9:33pm On Mar 25, 2017 |
olaboy1: They don't have Avensis Verso in America true BUT Toyota used the 1AZ-FE engine in several vehicle besides the above. Just run a part number search beginning with Amazon to see if you actually cannot find it cheaper in America |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 9:36pm On Mar 25, 2017 |
olaboy1: m_05_0092 deals with 1AZ-FE engines running the SFI SYSTEM m_05_0057 deal with 1AZ-FE engines running the EFI SYSTEM. From your user manual, which one does your vehicle run? That will determine which values are appropriate? --------------------------- MODIFIED BELOW -------------------------- Study both documents in their entirety, subtle differences exist, especially in/around the following: 1. heater resistance results are different 2. EFI relay position is different 3. EFI relay design is different The key to determine which system your ride uses is to study the EFI RELAY POSITION, then you will know which of the two documents to follow! |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by SmartchoicesNG: 10:04pm On Mar 25, 2017 |
AutoElectNG:1996 Honda civic European model... Manual transmission MA8. 1.4i |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 10:15pm On Mar 25, 2017 |
SmartchoicesNG: We could proceed but can you provide pictures of the problem area? It will help immensely in determining resolution approach |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by SmartchoicesNG: 10:58pm On Mar 25, 2017 |
AutoElectNG:Tomorrow. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 9:03pm On Mar 26, 2017 |
AutoElectNG: My car runs the EFI system, also base on the ECM connectors/pins settings in the pix attached below that are the same with my car, and the position of EFI relay. So readings from m_05_0057 are correct. Also since Toyota gave me the correct part numbers for the downstream sensors which normally read around 13ohms, so we can hereby conclude if my sensors manufacturer's readings must be above 10ohms then I can't run on SFI. SFI (5-10ohms) EFI (11-16ohms). |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 9:15pm On Mar 26, 2017 |
ECM
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 9:16pm On Mar 26, 2017 |
EFI relay 1 Like
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 10:09pm On Mar 26, 2017 |
I think I have to get back to you regards the EFI/SFI system thingy. I need more investigation on this, and this will be done when I get to the car physically tomorrow. The previous posts were made by just looking at the user manual and this seem not to be the best way to check my EFI relay at this time. I guess the manufacturer should write EFI on the relay in the car for easy identification. I have checked my engine spec in the manual and no where did they write EFI or SFI, just 1AZ-FE |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 10:17pm On Mar 26, 2017 |
This is the fuse box diagram in my user manual that seems to match with the SFI system diagram in m_05_0092
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 10:18pm On Mar 26, 2017 |
m_05_0092
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 10:20pm On Mar 26, 2017 |
m_05_0057
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 10:56pm On Mar 26, 2017 |
Till you sight the car! |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 11:06am On Mar 27, 2017 |
That's the fuse box. I asked from Toyota and they said it's EFI. Please can you confirm where the EFI relay is from this pix.
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 12:39pm On Mar 27, 2017 |
Orientation of your picture is wrong. Please find attached the correct orientation
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 3:01pm On Mar 27, 2017 |
Thanks. So it means my system is EFI. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 8:32pm On Mar 27, 2017 |
olaboy1: Cool, so you know which tests to follow! |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 8:35pm On Mar 27, 2017 |
Could you please break down the wire harness test procedure in m_05_0057 for P0141 and P0161 Because I did continuity test for ECM E10 connector HT1B with no result, and for ECM E9 connector HT2B I got 00.2ohms. So I want to know which connector/wire harness is for P0141 or P0161 while I wait for the upstream sensors to be delivered by Toyota. Note I disconnected the battery negative terminal during this continuity and short tests as adviced by you, although the FSM did not state that in step (3) but then in step (4) it was stated for the harness/oxygen sensor EFI relay test. https://www.motor.com/magazine-summary/diagnosing-o2-sensor-heater-circuit-failures/ |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 9:09pm On Mar 27, 2017 |
The third and last steps for P1135/P1155 in the FSM m_05_0098 did not explain how to check air fuel ratio sensor heater relay, and how to repair or replace wire harness or connector and the values in ohms/miliohms expected should that be the problem. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 8:05am On Mar 28, 2017 |
Additionally to the FSM wire harness integrity test, can I use the video below for proper diagnosis. I have an OBD2 wifi adapter now and a pro version of OBD car doctor app on my iPad to help me with all the data I need regards freeze frame, O2 sensor voltage scope, fuel trims etc. https://www.youtube.com/watch?v=PYFQ3Y4eFWY |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 1:24pm On Mar 28, 2017 |
Busy...will be here when the workload lessens... |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 4:36pm On Mar 28, 2017 |
AutoElectNG: Take your time broda. You have been very amazing giving us the right information. I did the wire harness test today and was able to detect the ECM connectors specifically for P0141 and P0161. The wire harness tests for continuity for both downstream sensors gave me 0.1ohms each (manufacturer's req is resistance 1ohms or less). I tried many times to test for short and never got any reading for both O2 sensors. I disconnected the ECM connectors (E10/E9), back probed HT1B and E2 no reading, HT2B and E2 no reading, and the only time I got some readings for both is before touching the lead on E2 which I presume is the ground, and I noticed the reading seem to be coming from my body or something. So for the short test I got 0.L on my DMM. I don't want to conclude that I have a short because I had difficulties before testing the ECM voltage and wire harness continuity until I got them right. My suspicion though is that HT1B and HT2B are the signal wires and E2 is the ground for both circuits, so maybe the ground E2 is not working properly and my body served as the ground during the tests and that accounted for the reading I got while the DMM lead was not on E2. As for the last tests which are oxygen sensor connector and EFI relay, the FSM did not state which pin on the EFI to touch. There are 4 pins on the relay and the way FSM described it like you need to probe one of the pins in the housing of the fuse box where the relay sits. I was wondering doing this test this way would not tell us if the relay is good or bad. Pleas shed more light on this. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 4:48pm On Mar 28, 2017 |
Steps 3 and 4 pixs attached
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by tunde783: 7:08pm On Mar 28, 2017 |
AutoElectNG: The timing chain was the culprit for the p0016code, it was exposed today. It jumped by one tooth. Find attached pic
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 7:58pm On Mar 28, 2017 |
tunde783:Great. AutoElectNG stated this in one of his posts. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 7:59pm On Mar 28, 2017 |
tunde783: Is it all sorted out? This was the suggested solution on this thread: https://www.nairaland.com/3661728/on-board-diagnostics-obd-ii-questions/5#54780638 as far back as March 20, 2017 at 1921 In the following words:
Have you done a post-repair scan that ensures that the following conditions are fulfilled?
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 8:00pm On Mar 28, 2017 |
Last picture
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