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post #1 of 11 (permalink) Old 06-01-2013, 06:17 Thread Starter
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TF oil temp sensor/gauge

Does anyone have a wiring diagram for the TF oil temp sensor and gauge?
I am in the process of replacing mine but am unsure about the 4 wires on the sensor(new sensor only has two wires)

Surely the gauge only needs two wires from the sensor, why would there be four? Do they serve another purpose?
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post #2 of 11 (permalink) Old 06-01-2013, 06:59 Thread Starter
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Gauge plug.
1. Red/Cream - Sensor + - not sure
2. Red/Black - Headlight power - has 12v when lights are turned on
3. Black - Ground
4. Yellow/Green - Acc power - has power on ignition turn on
5. Blue/Brown - Sensor ground - not sure



Sensor plug.
1. Brown/Blue
2. Black
3. Blue
4. Cream/Green



New gauge



New Sensor
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post #3 of 11 (permalink) Old 06-01-2013, 13:44
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The original sensor actually has two separate sensors in it, one for the engine ECU and one for the gauge.

You won't be able to replace the original sensor with the new one as it will leave the ECU with no signal.

Two options:

Measure the resistance of the new sensor vs. the original sensor gauge section. If the resistance is close then use the existing sensor, the tolerance is usually 10 or 20% on these components so you have a reasonable margin to play with.

Or

Tap the oil filter elbow and fit the new sensor.

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post #4 of 11 (permalink) Old 06-01-2013, 14:13 Thread Starter
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Quote:
Originally Posted by technozen View Post
The original sensor actually has two separate sensors in it, one for the engine ECU and one for the gauge.

You won't be able to replace the original sensor with the new one as it will leave the ECU with no signal.

Two options:

Measure the resistance of the new sensor vs. the original sensor gauge section. If the resistance is close then use the existing sensor, the tolerance is usually 10 or 20% on these components so you have a reasonable margin to play with.

Or

Tap the oil filter elbow and fit the new sensor.
Thanks do you know which two wires go to the ecu and/or gauge? I would prefer using the original sensor, just not sure how to hook it up.
I don't have the mems fitted anymore I have installed an emerald as I am planning on installing a turbo.

On my emerald pin outs I have
pink/black - oil temp sensor earth - pin 30
yellow/white - oil temp VVC output - not used
green/brown - oil temp sensor input - pin 10

I have also had a look at the tracks on the original gauge
1. Red/Cream - ?
2. Red/Black - Headlight power - has 12v when lights are turned on
3. Black - Ground
4. Yellow/Green - Acc power - has power on ignition turn on
5. Blue/Brown - ?

1 and 2 creates a circuit for the lamp in side the gauge, 4 and 5 creates a circuit on the motor that moves the needle in the gauge and 3 supplies ground on the needle motor.
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post #5 of 11 (permalink) Old 06-01-2013, 14:57
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You can purchase and legally download for 5$ the elelctrical circuit diagrams (as well other mauals) from
http://www.mgrover-online.com/?cat=76
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post #6 of 11 (permalink) Old 07-01-2013, 12:34
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I doubt very much that this website has the legal authority to sell any of the information that they advertise!


tAgC: I will double check the wiring diagrams later and confirm what exactly is what.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

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post #7 of 11 (permalink) Old 07-01-2013, 13:06 Thread Starter
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Quote:
Originally Posted by technozen View Post
tAgC: I will double check the wiring diagrams later and confirm what exactly is what.
Thank you, I have also emailed Karl at emerald to ask about the implications.
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post #8 of 11 (permalink) Old 07-01-2013, 14:50 Thread Starter
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Karl from emerald confirmed that the emerald ecu only looks at the oil temp at the VVC control unit.

It should be ok for me to replace the oil filter housing temp sensor then?
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post #9 of 11 (permalink) Old 07-01-2013, 15:23
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Quote:
Originally Posted by technozen View Post
I doubt very much that this website has the legal authority to sell any of the information that they advertise!


tAgC: I will double check the wiring diagrams later and confirm what exactly is what.
On the WEB page they refer: "This website is unofficial and is in now way affliated with MG Motors UK or SAIC Motor Company"
There is also a link to the MGOwner club
Administrator posted an adversiting in sept 2012.

May be you are right but I'm surprised that MGRover and MGOC are tolerating it.
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post #10 of 11 (permalink) Old 07-01-2013, 17:48
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The wiring diagrams show...

Black: Ground for the gauge temp sensor.

Brown/Blue: Temp sensor for gauge.

Blue: Ground for ECU temp sensor (connected directly to ECU).

Green/Orange: Temp sensor for ECU.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #11 of 11 (permalink) Old 07-01-2013, 17:53 Thread Starter
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Quote:
Originally Posted by technozen View Post
The wiring diagrams show...

Black: Ground for the gauge temp sensor.

Brown/Blue: Temp sensor for gauge.

Blue: Ground for ECU temp sensor (connected directly to ECU).

Green/Orange: Temp sensor for ECU.
Brilliant thanks a million.
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