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Old 7th September 2017, 14:56   #1
wmick
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Default MG ZT+ CDTI non starter

Hello all you knowledgeable types out there, a friend has been presented with an above MG in what appears to be a good condition.
But it won't start.
It's had no battery for about 9 months and when we came to start it today, it wouldn't, and both the fuel pumps were not running. Lights and wipers worked fine.
Is this a symptom of "immobiliser needing help" or is it something I can fix myself.
I've tried using TOAF to see if there's anything obvious but it won't talk to the ECU even though it will show errors in other modules.
Any ideas?

Mick
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Old 7th September 2017, 15:06   #2
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Hi Mick,
There could be any number of reasons for this.
First off, does the car have the ECU fitted (and plugged in etc)?
Have you checked all the fuses? (If the immobiliser and ECU cannot talk, the immobiliser state immobilised)


If you are near Hampshire, I may be able to help, I have a full set of spares for the diesel electronics so can help identify any issues.

Chris
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Old 7th September 2017, 15:57   #3
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Thanks Chris, the car was running fine 9 months ago, I've driven it myself, but the battery died and got chucked.
Maybe attempting to start it with a duff battery fried the immobiliser?

Mick
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Old 7th September 2017, 17:05   #4
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If it has been sat for 9 months could it be that the plenums are blocked and now flooded. That'll knock out the ECU.
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Old 7th September 2017, 17:29   #5
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If it has been sat for 9 months could it be that the plenums are blocked and now flooded. That'll knock out the ECU.
I agree, a job for Marinabrian..
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Old 7th September 2017, 17:31   #6
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ECU has been for a swim, fuel pump relay output is the first thing to go

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Old 7th September 2017, 21:18   #7
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Thank you everyone, I'll check the ECU in the morning.

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Old 8th September 2017, 22:56   #8
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OK, plenum dry as a bone, but I suppose the only way to tell is to look for a tide mark on the circuit board. That'll have to wait until next week.
Any other ideas?

Mick
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Old 8th September 2017, 23:01   #9
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Quote:
Originally Posted by wmick View Post
OK, plenum dry as a bone, but I suppose the only way to tell is to look for a tide mark on the circuit board. That'll have to wait until next week.
Any other ideas?

Mick
Yes, dig out your multimeter and take a look HERE

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Old 9th September 2017, 07:35   #10
HarryM1BYT
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Quote:
Originally Posted by wmick View Post
OK, plenum dry as a bone, but I suppose the only way to tell is to look for a tide mark on the circuit board. That'll have to wait until next week.
Any other ideas?

Mick
Dry now, doesn't mean it has never flooded. Its unlikely that the drains would become completely blocked, but they can become choked enough that in an heavy rain storm the water can rise up to flood the ECU. Which is all that is needed to damage the ECU. Once moisture gets into the case of the ECU, it cannot so easily get out again - it will percolate inside for months.

It only takes a few minutes to remove the ECU to have a quick look at it, but a good indicator of any past flooding, is the pollen filter if it has been in there a while.
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http://www.the75andztclub.co.uk/foru...40#post1764540

Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing.

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