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Coolant Temp Sensor for ECU Location
Posted: Sun Feb 25, 2007 2:13 pm
by Brett_MX5
I've been looking around the engine to find out where the temp sensor is that sends the signal to the ECU - but I can only find the one on the back of the engine - I thought there were 2 temp sensors (1 for the gauge and 1 for the ECU)
Is there another one somewhere - or does the sensor on the back of the engine do both the gauge and the ECU ??
I've got an NB8A if it makes a difference
Posted: Sun Feb 25, 2007 7:49 pm
by Garry
The ECU temp sensor and fan switch are combined on a sensor at the back of the engine. I'm not sure where the gauge sender is, though I thought it was on the back of the engine somewhere as well
Posted: Sun Feb 25, 2007 9:38 pm
by Brett_MX5
I unplugged the sensor at the rear of the engine and the Temp Gauge didn't work - so I'm guessing that they all run off the same sensor unless there is another one hiding somewhere else
Posted: Sun Feb 25, 2007 9:53 pm
by Fatty
maybe the gauge runs off a signal from the ecu? just a thought.
Posted: Mon Feb 26, 2007 5:22 pm
by Russellb
The sensor on the back of the Engine is for the ECU and the TEMP gauge
The ECU controls the thermo fan
Posted: Mon Feb 26, 2007 6:23 pm
by namster
what colour is the wire that leads to the ecu?
Posted: Tue Feb 27, 2007 8:50 am
by Garry
and the TEMP gauge
Posted: Wed Feb 28, 2007 5:34 pm
by Russellb
Temp gauge wire is Violet with a White Stripe
Posted: Thu Mar 01, 2007 8:34 pm
by sabretooth
The internal temperature gauge has its own single wire sensor.
The temperature sensor that the ECU uses to obtain the coolant temperature is in the back of the head in what looks like a thermostat housing. It's under the coil packs.
Unplugging that will -not- change the internal gauge - it'll just cripple your ECU.
Hidden in shadow to the left is the internal gauge sensor.
The dark green thing closest to the camera is the sensor you want.
