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Hello and please could someone help?

My daughter has a 1.0 litre Corsa C, 2006 model with the Z10XEP engine. She has had the vehicle for 6 months and absolutely no issues until yesterday. Symptoms of the issue was lumpy idling, loss of power and cutting out. Car has only done 50k genuine miles and was serviced and MOT'd on purchase. I did not realise until yesterday that the Engine Management Light was not working. I did the pedal test and found out straight away that there was 2 error codes relating to a faulty crankshaft sensor and also the No. 2 CO sensor. I purchased new parts from Euro Car Parts and fitted them yesterday and the issue was soon resolved.
However, I'm concerned that the EML is not working and suspect (but can't prove it) that a previous owner disabled the lamp (LED) by making a disconnection somewhere. I very much doubt that the LED has failed but before dismantling to investigate further, I have a simple question:

Does anyone have a wiring diagram that they can share showing the circuitry from the Engine Management Unit to the Engine Management Light within the instrument cluster? Even to know the colour code of the wire would be a big help at this stage. I can then go hunting and find the source of this issue and hopefully get the EML working again.

Thanks in advance, Ian.
 

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There isn't a direct connection from the engine ECU to the EML. If it's not working then it was disabled in the instrument cluster.
 

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Discussion Starter #3
Thanks Mr drew - that’s a great pointer and I’ll take a look at the instrument cluster and try and establish what the cause of this issue is.
 

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Thanks Mr drew - that’s a great pointer and I’ll take a look at the instrument cluster and try and establish what the cause of this issue is.
Instrument cluster is a piece of cake to remove, couple screws to get the shroud off and then it unscrews from the mounts

My guess is that they've pulled the dials and taped over the lamp, it's fairly common from what I've heard
 

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Instrument cluster is a piece of cake to remove, couple screws to get the shroud off and then it unscrews from the mounts

My guess is that they've pulled the dials and taped over the lamp, it's fairly common from what I've heard
Hi and thanks for your response. What you have suggested sounded exactly what I was expecting but having removed the cluster this evening and dismantled it, I can find nothing obviously wrong. All the LED's appear to be intact and it does not look like it has been interfered with but I could be wrong.
Unfortunately for me though the ribbon cable which attaches the mileage display has now become detached so I will probably drop the instrument cluster off to a local repair specialist. Thanks again.
 

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Hi and thanks for your response. What you have suggested sounded exactly what I was expecting but having removed the cluster this evening and dismantled it, I can find nothing obviously wrong. All the LED's appear to be intact and it does not look like it has been interfered with but I could be wrong.
Unfortunately for me though the ribbon cable which attaches the mileage display has now become detached so I will probably drop the instrument cluster off to a local repair specialist. Thanks again.
Honestly it would be cheaper to replace the entire instrument cluster, they're about a tenner if you keep your eyes peeled, needs Tech2 or OpCom but you'll want those for the Corsa anyway
 

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Judging by the diagrams, EML lamp is connected directly from the ECU to the instrument cluster. Wire color should be brown-blue.
This info is from Autodata diagrams so take it with a grain of salt, I don't have access to the TIS2000 currently. :/
 

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can anyone suggest me a good car battery company?
Yuasa, Bosch, Varta

As long as you get one with a warranty you should be fine
 

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Discussion Starter #10
Instrument cluster is a piece of cake to remove, couple screws to get the shroud off and then it unscrews from the mounts

My guess is that they've pulled the dials and taped over the lamp, it's fairly common from what I've heard
Honestly it would be cheaper to replace the entire instrument cluster, they're about a tenner if you keep your eyes peeled, needs Tech2 or OpCom but you'll want those for the Corsa anyway
You were spot on with the diagnosis - on taking a closer look, I found that mastic had been applied in the gap between the LED and the engine symbol. I have taken some time and have carefully soldered a new ribbon cable in and the cluster is now working fine.
I have since found that the underlying reason why the engine lamp had been disabled was because of problems with the lambda sensors. My basic fault code reader confirmed this as I had all the fault codes for both sensors and after checking both sensors with a multimeter, I found that both heater circuits were open circuit. That was the limit of my diagnosis so I ordered 2 new sensors.

This is where it gets interesting and because I do not know the history from previous owners, I wanted to be sure that the vehicle was actually fitted with the correct sensors. I went to the Vauxhall main dealer and they told me that for my vehicle:
No.2 sensor should have a label 'BY' and the Vauxhall Part Number is 93177451. After doing my research I find that this is a Bosch 0258006506.
No.1 sensor could either be exactly the same as above or alternatively have a label 'DD' and the Vauxhall Part Number is 931990419. After doing my research I find that cross-references to a Bosch 0258006924.

On the vehicle I find:
No.2 sensor was a Bosch 0258006503 which is the same as what Vauxhall said it should be.
No.1 sensor was an NTK OZA659-EE70 which was not as expected.

So knowing that both sensors are faulty I decide to buy 2 new Bosch Sensors 0258006506 with the 'BY' label.

After fitting these sensors and after driving about 30 miles, the EML came back on and my basic fault code reader is displaying P0130 and P0135 indicating faults with the No.1 sensor. I have checked the heater circuit for continuity and it is fine. With the engine running I'm getting 12V across the heater and around 0.7V across the sensor when the engine is warm.

I'm now at the reach of my capability but would like to seek advice about whether I have the correct type of No.1 sensor fitted. Can anyone help confirm?

The vehicle is a 2006 Corsa C, 1 litre with the Z10XEP engine.

So far I have checked out the various different automotive suppliers and am getting conflicting advice so thought I would turn back to this forum.

Any advice would be appreciated. The car drives fine, only done 50k and the EML is getting me down!

Thanks.
 

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You were spot on with the diagnosis - on taking a closer look, I found that mastic had been applied in the gap between the LED and the engine symbol. I have taken some time and have carefully soldered a new ribbon cable in and the cluster is now working fine.
I have since found that the underlying reason why the engine lamp had been disabled was because of problems with the lambda sensors. My basic fault code reader confirmed this as I had all the fault codes for both sensors and after checking both sensors with a multimeter, I found that both heater circuits were open circuit. That was the limit of my diagnosis so I ordered 2 new sensors.

This is where it gets interesting and because I do not know the history from previous owners, I wanted to be sure that the vehicle was actually fitted with the correct sensors. I went to the Vauxhall main dealer and they told me that for my vehicle:
No.2 sensor should have a label 'BY' and the Vauxhall Part Number is 93177451. After doing my research I find that this is a Bosch 0258006506.
No.1 sensor could either be exactly the same as above or alternatively have a label 'DD' and the Vauxhall Part Number is 931990419. After doing my research I find that cross-references to a Bosch 0258006924.

On the vehicle I find:
No.2 sensor was a Bosch 0258006503 which is the same as what Vauxhall said it should be.
No.1 sensor was an NTK OZA659-EE70 which was not as expected.

So knowing that both sensors are faulty I decide to buy 2 new Bosch Sensors 0258006506 with the 'BY' label.

After fitting these sensors and after driving about 30 miles, the EML came back on and my basic fault code reader is displaying P0130 and P0135 indicating faults with the No.1 sensor. I have checked the heater circuit for continuity and it is fine. With the engine running I'm getting 12V across the heater and around 0.7V across the sensor when the engine is warm.

I'm now at the reach of my capability but would like to seek advice about whether I have the correct type of No.1 sensor fitted. Can anyone help confirm?

The vehicle is a 2006 Corsa C, 1 litre with the Z10XEP engine.

So far I have checked out the various different automotive suppliers and am getting conflicting advice so thought I would turn back to this forum.

Any advice would be appreciated. The car drives fine, only done 50k and the EML is getting me down!

Thanks.
Mine's the same, there's a noticeable power decrease but I don't have the money to make the light go out

I can check which part # I've got fitted, it's the original factory one, but it'll have to wait, car's in storage for lockdown
 
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