r34 code 14

[kotttte]

R34 GTT 1998, engine light code 14 speed sensor. Came out of no where. Randomly stiff and light power steering. Speedo works so if i've read correctly the speed sensor inputs cluster first and the cluster gives information to the ecu. Nissan consult on a laptop saw no speed sensor input from the ecu. Is the speed sensor bad or is there something else wrong.

Wiring diagram for the whole speed sensor to ecu?

[kotttte]

hicas doesnt seem to work, no light tho. also when idling and staying still and spinning the wheel around the engine light goes away and comes back randomly.

 

[kotttte]

wire seems to be intact from behind the cluster to ecu. cluster pin 30 (vehicle speed 2pulses) to ecu pin 29 (vehicle speed sensor 2)

[kotttte]

can anybody with more electrical knowledge teach me how to read the input of so called wire from behind the cluster?

[kotttte]

did a automatic transmission selfdiagnostic, got code 2. witch is vehcile speed sensor 2. where is this sensor and how to test it out? Somebody has to have some knowledge on this problem

[kotttte]

okay okay. spamming this wont help. But the cluster seems to be at fault. Can i use a manual cluster even when i still have automatic trans? how about gtr cluster?

[GTSBoy]

If speedo is working then speed sensor is working. +/- 1V sawtooth (AC) signal generated by the speed sensor is translated into 0-5v square wave PWM signal at the speedo head and transmitted on the Consult bus for all the CUs to read. if the ECU can't see it then the TCU and the HCU won't be able to see it either. Would suggest that either head has a fault or the wiring is broken in some way. Look at the wiring diagrams for ANY Skyline to see how that signal typically gets around, then chase its wiring around with a multimeter. If you want to look for the signal itself, you will need an oscilloscope of some description.

[kotttte]

speedo, traction control and hicas works, looking for a new cluster atm. When I get a new one and the ecu still doesnt see the input something else is at fault. I also checked for continuity in the wire that goes from the cluster to ecu and it was fine. Could it have gotten grounded some where and the ecu fried something in itself?

[GTSBoy]

Speedo can work to look at. If it is not sending a speed signal to the ECU then it is likely not sending a speed signal to any other CU either.

I told you what the speed signals look like. Put an oscilloscope on the back of the cluster and look for the bloody signal already.

[kotttte]

Fine fine, I'll look for an oscilloscope, hard to comeby around me

[niZmO_Man]

Jaycar? Alibaba?

[GTSBoy]

22 hours ago, kotttte said:

Fine fine, I'll look for an oscilloscope, hard to comeby around me

You can buy a USB one that plugs into a mobile phone and runs from an app for bugger all. eBay.