Sahin wrote:First of all with the speedo "As a last option I ran two cables one from the speed sensor to ground and the other directly to the dash input screw on the back of the cluster. Working Speedo!! and the the Cat light went away!"
Can you elaborate on this? what wire did you ground and what wire did you send to the input screw on the speedo...? my speedo and odometer wont work and it's been pissing me off for ages I've change everything that it could be and still nothing...
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First thing Sahin is to check for flatten pins in the dash harness plugs. Unscrew your dash cluster (pull surround and then there are 4 screws to hold it)(i find the easiest way is to turn it flat, gauges up to get it past the surround and steering wheel)
Behind there is two plugs, a Blue and a Brown Plug. The speed sig (Pin 49) is on the bottom row of the brown plug, 5 from the right (the last pin before a bunch or pinless ones coming from the right to left.)(if you unclip the plug its the only yellow cable in that harness) Check if the pin is flatten and if so bend it up to a arch. This may be the simple solution for you.
If its not flattern....
test your speed sensor. The Workshop manual says to pull it out, but you can test it on the car. The speed sensor is on the top side at the back of the gearbox its down past the gear selector cables you may need to remove your battery.
Its Three wires. 12v+, GND, and Signal.
You will need a Multimeter. Check with the Ignition on. Use the Positive Lead on the voltmeter (normally red) to Black-White of the sensor and the Ground Lead of the Multimeter(Normally Black ) to the car body/engine the Multimeter should read 12v.
Next set the Multimeter to resistance normally a Ω symbol and test between the Black wire and the car body/engine. The Multimeter should change from 1 to something closer to 0, if it stays 1 you have a bad earth. Ghetto fix is solder a cable from there to the neg on the battery
The last step is the sig wire. Its Yellow-White. Its Provided 4.7v+ from the ECU as the speed sensor rotates the voltage will spike down to 0v 4 times for every rotation. Volt test this first, if its not 4.7v+ you have a issue between the speed sensor and the ECU or the ECU is farked.
If it volt tests up ok. next is a driving test, you will need to run a cable from the sensor to the Multimeter in the car and have someone watch it as you drive. You have two choices to do this.
Either cut the yellow-white and solder it back together with a 3rd wire to run into the car, or pull your ECU down onto the floor and jam the Multimeter Red pin into PIN 86 of the ECU and again GND the BLACK pin of the Multimeter (the screw inside the bottom of center hatch is a good ground)
Now once driving the multimeter should go crazy with the volts trying to keep up with the speed sensor. thats a good thing. If it saying 4.7v+ and doesnt move you have a dead speed sensor.
If it does the problem is in the dash.
Pull the dash again and check the sig pin again with a multimeter for the same 4.7v+. If its not there is a issue between pin 86 on the ecu and the dash harness. (Get the workshop manual and check the voltage at connector B-77 Pin 10) as it goes from the ECU to 77 and then to the pin on the dash.
It the dash pin checks out for 4.7v+ on the back of the cluster there is some screws, these screws join pins on the speedo and tach boards to the wiring board your looking at. You will see on the back some are labeled S, T, +, -
Behind the speedo itself the is a S, a + and a -. Unscrew these warp three wires around each screw with some length and put them back. Put the dash back in. This time check + has 12v+, that - resistance Ω to ground is close to 0 and that S has 4.7v+
If + fails check pin 33 (Black-Yellow) and 48 (Red-Black) in the brown dash plug arent flattened.
If - fails check pin 6 (Black) and 22 (black) in the blue plug arnt flattened.
If S fails to be 4.7v+ it should have failed the first test recheck for a flattened pin.
With the S cable do another drive test for the crazy voltage between 0-4.7v while driving.
If they all check out you have a dead speedometer.
Summary:
a) No 4.7v+ anywhere faulty ECU or wiring
b) 4.7v some places, flatten pins or wiring
c) No voltage drop from 4.7v while driving, faulty speed sensor
d) No 12+ or bad ground on speed sensor, faulty wiring.
e) all checks out, faulty speedometer
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