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No communication with the ECU

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Odin68510
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Joined: 04 Apr 2014
Posts: 32
Location: France

PostPosted: Fri Apr 04, 2014 20:38    Post subject: No communication with the ECU Reply with quote

Hello, I'm French my English is not good, but translate helps me.
I have a 1999 Trooper 3.0 TD Duty for 1 year, it has 110000 km.
He started to run on 3 cylinders, I go to the Isuzu garage to check with Tech2, the mechanic told me that he can not control anything because it does not communicate with the ECU.
Do you have an idea of ​​this failure?
Tech2 on the screen it says "No communication with the ECU"

thank you and Sorry for the BAD English  Sad
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Browndoff
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Joined: 22 Mar 2013
Posts: 513
Location: Dublin 13, Ireland

PostPosted: Fri Apr 04, 2014 23:07    Post subject: Reply with quote

Hi Odin, the Tech2 problem is a nuisance - but this need NOT stop you fixing the car! All you need to do is to check WHICH Injector is NOT FUNCTIONING. To do this, you can start engine and then DISCONNECT the Injector-Loom of wires, one connector at a time. The 10-pin connector for the Injectors is located down by the Oil-Filler-Tube and it is marked A ~ K for the individual connectors. K = Injector #1; J = Injector #2; H = Injector #3 and G = Injector #4.

It is NOT easy to disconnect the individual connectors, without moving the whole plug - but you can try that - or make up a 'temporary' connector [as I did] from one half of the junction to the other. Either way, WHILE the engine is running - you must disconnect ONLY ONE Injector at a time. If one of them makes NO DIFFERENCE to the engine-speed at tickover - it shows that THIS ONE is not firing normally - and must be replaced.

There is a lot of information on the website about the replacement of Injectors. It's an EASY, uncomplicated job, using very ordinary tools - but, of course, you must replace ALL the seals that you remove while doing the job [they are VERY cheap!]. Injectors are NOT cheap - but you CAN get used Injectors which might function perfectly. Afterward, you must reset the ECM to the correct GRADE of new Injector in each cylinder - but don't worry - it is NOT dangerous to run the engine without this correction - only NOT fuel-efficient!
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2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc.
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Odin68510
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Joined: 04 Apr 2014
Posts: 32
Location: France

PostPosted: Sat Apr 05, 2014 7:42    Post subject: Reply with quote

Thank you for your answer, I bought 4 new injectors at Ramin in Dubai. I also made test the ECM in Germany, but they did not find problème.
I also took the opportunity to change the rail pressure sensor. Next week I go back everything.
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Browndoff
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Joined: 22 Mar 2013
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Location: Dublin 13, Ireland

PostPosted: Sat Apr 05, 2014 10:32    Post subject: Reply with quote

Regrettably, the Tech2 IS required for correct setting of the 4 new Injectors and the new ORPS. So, you'll STILL have to solve the problem of bad connection with the Tech2.

The ECM needs to be SET to the ZERO-POINT of the new ORPS - i.e. when the Rail-Pressure actually IS at zero - the ECM must be set to accept the  output from the ORPS as the voltage appropriate to zero-pressure.

The top-plate of each of the new Injectors will have 3 numbers on it; on top, the part # [same on all 4], in the middle the serial # [unique] and on the bottom, the 2-digit Grade Number. The ECM must be reset to the group-code of each INJECTOR – based on Grade # - for instance, mine are [all 4] #37 which equates to code A3.
A1  =  20 ~ 26 A2  =  27 ~ 33 A3  =  34 ~ 39 B1  =  40 ~ 46 B2  =  47 ~ 53
B3  =  54 ~ 60 C1  =  61 ~ 67 C2  =  68 ~ 74
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2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc.
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Gribble
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Joined: 11 Oct 2007
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Location: Holset H221W

PostPosted: Sat Apr 05, 2014 19:48    Post subject: Reply with quote

Did the Tech have the right card in the Tech 2 ? A No Comms message means the Tech 2 cant 'see' the ECU to talk with it so maybe you could try whats called a Flash Code test to see if the faults in the car or with the Tech 2 .

You can read on here how to do that test with a paperclip .
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Odin68510
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Joined: 04 Apr 2014
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Location: France

PostPosted: Sun Apr 06, 2014 10:34    Post subject: Reply with quote

Gribble wrote:
Did the Tech have the right card in the Tech 2 ? A No Comms message means the Tech 2 cant 'see' the ECU to talk with it so maybe you could try whats called a Flash Code test to see if the faults in the car or with the Tech 2 .

You can read on here how to do that test with a paperclip .


I found an invoice of the former(old) owner, he(it) had problems to start.
He(It) brought Trooper to the garage, and there there was already this problem of reading ECM, the mechanic then connected another ECM on the trooper to be able to connect it and read information of the computer.

Tech 2 only detects ABS. I think the garage Isuzu has the right card.
The Flash Code is OK!
Is my ECM in question?
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Odin68510
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Joined: 04 Apr 2014
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Location: France

PostPosted: Sun Apr 06, 2014 10:38    Post subject: Reply with quote

I cant post picture, I have a antispam message, How do we make?
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Gribble
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Joined: 11 Oct 2007
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Location: Holset H221W

PostPosted: Sun Apr 06, 2014 10:56    Post subject: Reply with quote

Send the picture to a moderator in a pm is a way round this ,Dylan has done it before I think.

Umm ,the ECU is the computer so if the mechanic changed it for another one then the information would have stayed in the old ECM . There is also the problem of the other ECU not being accepted by the immobiliser ECU so I'm not sure how the mechanic got round that  Confused
It's possible your ECM has a fault  but that means it going to a specialist to be checked and I read that's been done ?

Also you post there are no flash codes stored ,is that right ? Ok pull the plug off the engine temp sensor and see if that gives o code that way you know the ECU is seeing the fault .

Tech 2 reads all the engine data not just ABS.
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Odin68510
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Joined: 04 Apr 2014
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Location: France

PostPosted: Tue Apr 15, 2014 15:41    Post subject: Reply with quote

Hello, I sent my computer in Germany for inspection, he came back no fault found. Apparently this is not hardware but software.
So I put together the new injectors, new rail pressure sensor, the Trooper to a very good start.
He drives normally, but no way to connect the Tech2 to change the settings of the new injectors and sensor.
I tested every cable, everything is ok.
It must be the ECU is blocked, but a new computer costing 1540 USD.
At the moment I drive it like this ...
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Browndoff
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Joined: 22 Mar 2013
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Location: Dublin 13, Ireland

PostPosted: Tue Apr 15, 2014 18:34    Post subject: Reply with quote

There IS another, much simpler, explanation! The OBDII-plug [=DTC-plug] - or its cable - could be faulty! Try to trace the individual leads back to the ECM [and wherever others might go] and then check for CONTINUITY along these lines.

[img][/img]

This table shows the colour of each lead going into the Diagnostics-plug and where it goes on the other end - the 'other end' is identified by connector numbers, as found in the PDF Manual for the Trooper. If you find perfect conductivity from end-to-end of each lead - then either YOUR ECM or the local garage's Tech2 is at fault - but at least you'll KNOW that it wasn't just a lousy connection!
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2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc.
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Odin68510
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Joined: 04 Apr 2014
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Location: France

PostPosted: Tue Apr 15, 2014 19:07    Post subject: Reply with quote

Yes I find perfect conductivity from pin: 2 to J2-5
                                                             4/5 to Earth
                                                             6 to J2-29
                                                             9 to J2-6
                                                             12 and 13 ???
                                                             16 to fuse F14

I think the local garage's can not use correctly the Tech2 because they used only for the Dmax.
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Browndoff
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Joined: 22 Mar 2013
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Location: Dublin 13, Ireland

PostPosted: Tue Apr 15, 2014 19:42    Post subject: Reply with quote

There MIGHT be an explanation in that:- "The local garage can not use the Tech2 correctly because they have used it only for the Dmax"!!

It might be that the Memory-Card [the computer software] in the Tech2 recognises ONLY the later models [Isuzu Dmax] - and cannot 'see' the earlier Trooper.....? Perhaps you could persuade the local garage staff to contact their Main-Dealer and get the earlier type of Isuzu software-card [if only 'on loan'].

By the way, you mentioned that the Tech2 could see only the ABS - yet you marked '?' after both #12 [for the ABS] and #13 [for the Air-Bag system]. My car has no Air-Bag - so no lead #13 - but it HAS #12 for the ABS [and #7 and a second #2, also for the ABS]. If your car has not got these leads - HOW can the Tech2 claim to see the ABS????
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2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc.
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Odin68510
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Posts: 32
Location: France

PostPosted: Tue Apr 15, 2014 19:48    Post subject: Reply with quote

The garage has the program for Isuzu Trooper Holden / Jackaroo. It has detected the ABS module. But nothing for the ECU when the mechanic to click on the date and the type of car it had the message no communication with ECU.
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Gribble
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PostPosted: Tue Apr 15, 2014 23:29    Post subject: Reply with quote

Did the mechanic have a CanDi unit in the line to the Tech 2 ? Thats  a canbus to serial bus interface unit so maybe the Tech is used to newer cars ?

It would block the T2 from seeing the ECU .
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Odin68510
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Joined: 04 Apr 2014
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Location: France

PostPosted: Wed Apr 16, 2014 13:47    Post subject: Reply with quote

Gribble wrote:
Did the mechanic have a CanDi unit in the line to the Tech 2 ? Thats  a canbus to serial bus interface unit so maybe the Tech is used to newer cars ?

It would block the T2 from seeing the ECU .


I don't no, it was just the cable and the Tech2.

Gribble you followed another topic (http://www.itocuk.co.uk/forums/viewtopic.php?t=29288&highlight=egr) and lightwork writing:

"Should be able to get to the fault codes via the OBD socket and short length of wire, but would really like a more complete
solution, so that I can do things like program replacement injector parameters etc. Bought an ELM327 obd to usb interface
from eebuygum, which is supposed to handle all protocols and it can see the interface and vehicle bus, but can't seem to communicate
with the ECU. I read on one page that even the dealer's tech II won't talk to some of the early, pre 2001 Troopers, but not sure
how true that is.
"

the mine is from the year 2000, i think it's produced in 1998/1999
This may be the same problem.
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