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Old 09-05-2017, 18:45   #1
Mikaans
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Default Mg zt cdti safe mode, temp gauge maxed

Hi guys,
I have MG ZT Cdti 2003
Cars in some kind of safe mode now as i cant go any faster than 15mph or so.
Temp gauge goes to the max as soon as i turn ignition on. (Checked with obd reader and it shows teperature over 100 with cold engine, no error codes)
No warning lights on dash.
Also it takes like 10-15secs to start the car.
Changed engine coolant sensor (the one in the centre of engine below inlet manifold, not sure if theres more than one)
Checked old one with tester at 20k and it seems to be working fine, also connected it straight from the ecu(to be sure theres nothing wrong with wires between ecu and sensor)
No succes so far
Thinking of buying second hand ecu but would it work straight away or itll need some coding?
Any ideas?
Any help would be much appreciated.
Thank you in advance.
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Old 09-05-2017, 21:24   #2
Talkingcars
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Default Re: Mg zt cdti safe mode, temp gauge maxed

Hi and welcome to the forum

I don't know the 75/ZT or the diesel but with the K series in the other models there are two coolant sensors, one with a single wire for the temp gauge and another with two wires for the ECU.

OBD reads the ECU so if both OBD and gauge give an inaccurate reading something else is going on.

I would look for damaged wiring.

Again I'm not sure with the diesel but some models of the ZT/75 suffer with drowned ECUs where it sits in the scuttle channel.

The ECU is coded to the alarm ECU.

James
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