MG ZT 190 - No Tachometer, Temperature Gauges, Engine fan issue

dim3000 · 24th September 2019, 17:34

Hello all,

I would really appreciate your help on my electrical issues. My gauges recently stopped working and it seems around the same time, fan started having issues.
Seeing as how I can read values from the ECU via OBD, it is leading me to believe this is a wiring issue somewhere. Any ideas?

Car: 2001 MG ZT 190 (LHD)

What isn't working:
1. Tachometer Gauge / Rev counter
2. Coolant Temperature Gauge
3. No AC
4. Engine fan always on at full speed (after engine start)

What I have done so far:
1. Plenums check (few leaves, no water, pollen filter dry)
2. Instrument Cluster Dials check (all dials and lights work during test)
3. Connected OBD scan tool with Torque app. Able to read both the RPMs and the coolant temperature.

Thanks in advance!

Yorkshire GOC · 24th September 2019, 18:45

Your fan is on continuously because your ECU is getting no cooling temperature readings from the sensors - its a default protection for your engine -as the ECU does not know the running temp the fan is switched on - as to your tachograph and coolant sensor not working - it may be a fuse /wiring issue but i suggest you drop MarinaBrian or Big Russ a PM for an expert opinion as it may be an ECU issue as well.

dim3000 · 24th September 2019, 18:53

How could that be the case though? As I stated above, I can read values for coolant temp and RPMs from the ECU via an OBD scan tool. Leading me to believe ECU is getting everything just fine.

Yorkshire GOC · 24th September 2019, 18:58

If your coolant sensor/crankshaft sensor are sending signals to the ECU but not to the gauges and assuming your ECU is dry i would suggest a Can bus or K bus wiring issue ?

marinabrian · 24th September 2019, 19:03

The IPK isn't communicating with the ECM on the CANBUS

I would suggest unplugging the IPK and cleaning the contacts of both connectors, then reconnecting and see if this resolves your problem.

However more interestingly for me at least is the fact you have a V6, and I've not known the EMS2000 to exhibit the CANBUS fault most commonly found on a batch of 1999 model year diesels of "Message Failure Instrument Pack 3"

Brian

24th September 2019, 17:34	#1
dim3000 Newbie MG ZT 190 Join Date: Aug 2019 Location: Berlin Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	MG ZT 190 - No Tachometer, Temperature Gauges, Engine fan issue Hello all, I would really appreciate your help on my electrical issues. My gauges recently stopped working and it seems around the same time, fan started having issues. Seeing as how I can read values from the ECU via OBD, it is leading me to believe this is a wiring issue somewhere. Any ideas? Car: 2001 MG ZT 190 (LHD) What isn't working: 1. Tachometer Gauge / Rev counter 2. Coolant Temperature Gauge 3. No AC 4. Engine fan always on at full speed (after engine start) What I have done so far: 1. Plenums check (few leaves, no water, pollen filter dry) 2. Instrument Cluster Dials check (all dials and lights work during test) 3. Connected OBD scan tool with Torque app. Able to read both the RPMs and the coolant temperature. Thanks in advance!

24th September 2019, 18:45	#2
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,063 Thanks: 1,842 Thanked 623 Times in 469 Posts	Your fan is on continuously because your ECU is getting no cooling temperature readings from the sensors - its a default protection for your engine -as the ECU does not know the running temp the fan is switched on - as to your tachograph and coolant sensor not working - it may be a fuse /wiring issue but i suggest you drop MarinaBrian or Big Russ a PM for an expert opinion as it may be an ECU issue as well. __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

24th September 2019, 18:58	#4
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,063 Thanks: 1,842 Thanked 623 Times in 469 Posts	If your coolant sensor/crankshaft sensor are sending signals to the ECU but not to the gauges and assuming your ECU is dry i would suggest a Can bus or K bus wiring issue ? __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

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24th September 2019, 18:53	#3
dim3000 Newbie MG ZT 190 Join Date: Aug 2019 Location: Berlin Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	How could that be the case though? As I stated above, I can read values for coolant temp and RPMs from the ECU via an OBD scan tool. Leading me to believe ECU is getting everything just fine.

24th September 2019, 19:03	#5
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	The IPK isn't communicating with the ECM on the CANBUS I would suggest unplugging the IPK and cleaning the contacts of both connectors, then reconnecting and see if this resolves your problem. However more interestingly for me at least is the fact you have a V6, and I've not known the EMS2000 to exhibit the CANBUS fault most commonly found on a batch of 1999 model year diesels of "Message Failure Instrument Pack 3" Brian