TwinTurbo.NET: Nissan 300ZX forum - ECU not seeing Vehicle Speed
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Subject ECU not seeing Vehicle Speed
     
Posted by Carlos Ramirez on November 14, 2012 at 11:12 AM
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Message Good Day guys

Before I start digging for to long I wanted to see if anyone has already come across this problem.

My Speedometer is working and reporting speed. However my when I hooked up laptop to the obd port and checked the ECU is not showing a vehicle speed I was wondering if any one seen this problem before? This ofcourse is affecting my powersteering which is my main concern.

From the electrical diagram it seems the Vehicle speed sensor is on the transmission harness that then connects to main harness, than then goes into the dash cluster, and then out of the dash cluster it then connects to the EFI harness that connects to pin 53 with a yellow/green wire.

My concern is that there is a lot of connection points and possible problem areas and without an oscilloscope I won't be able to see where the problem is at.

I do have a defi-link system that also shows my vehicle speed that is tapped into the ecu line.

Any help in pin pointing a problem location would be appreciated or good trouble shooting methods.


     
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