transmission need diagnosing

[somedude_001]

for a few years now I have had issues with my VSS (vehicle speed sensor) intermitenly dropping out. but I have never been able to diagnose it because it would start working again by the time I got home. Well since the new tranny it does now work at all now. does anyone have a flow chart to trouble shoot VSS issues?

O/D light flashing (will pull codes tonight)

transmission O/D button unresponsive (may be due to VSS issues)

manual shifting will only command second gear or drive. the 1 position does nothing most of the time but will sometimes (very rare) let me run out first gear.

I am not super savy when it comes to wiring issues but this needs to be fixed fast if there is any hope of getting it to the convention.

I am so frustrated with this car I as strongly considering cutting a fuel line just to get the satisfaction of watching it burn to the ground.

edit: 1994 ATX

 

[St Louis SHO]

1. Check to make sure the gear on the VSS isnt cracked/broken.
2. Double/triple check the jumper harness from the VSS to near the rear O2 sensor connector, make sure its clean, not broken.. etc...

 

[rubydist]

The trans o/d button should be unrelated to any vss issue - nearly always is the wire inside the shifter that is broken or connector come off. Simple, but challenging to fix.

Your manual shifting symptoms suggest a trans solenoid issue, which should show up in the codes when you pull them.

 

[somedude_001]

1. Check to make sure the gear on the VSS isnt cracked/broken.
2. Double/triple check the jumper harness from the VSS to near the rear O2 sensor connector, make sure its clean, not broken.. etc...

the sensor was installed new with my last transmission last june. visually it looked fine when I installed the transmission. It is cannot be seen now that it is in the car. before I posted this thread I removed that whore of a connector near the rear o2 to inspect and clean but still no VSS signal.

The trans o/d button should be unrelated to any vss issue - nearly always is the wire inside the shifter that is broken or connector come off. Simple, but challenging to fix.

Your manual shifting symptoms suggest a trans solenoid issue, which should show up in the codes when you pull them.

I am really hoping that it is not a solenoid issue because it will run all 4 gears some of the time. it does not always go into first when at a stop and will not let me select first manually.

I really need a flow chart to diagnose this pig.

 

[somedude_001]

ok KOEO code list

511 "EEC processor ROM test failure."
519 "PSPS circuit open."
551 " IAS circuit failure"
558 "EVR circuit failure."
565 "CANP solenoid circuit failure."

*511 I always assumed was due to the tweecer
*519 I can't find the connector that fits the rack honest I spent like 30 min
*551 honestly I am not sure what this is. Idle air solenoid? my idle is all over when i first start the car. I just assumed it was that way because I never tuned the car after installing the cams.
*558 EGR Vacuum Regulator solenoid = evr Not sure why it is failing but it is blocked off anyway.
*565 charcoal canister was removed to fit turbo piping and air filter.

 

[somedude_001]

problem no VSS signal. here is what I got so far.

Turn meter on

test meter

this is a old VSS I had laying around from over 3 years ago. all data says the following

Is resistance between 190 and 250 ohms?

the meter is showing a near short correct? in other words a bad sensor.

this is the VSS I just removed from the car and is about a year old. This also shows the same thing as the last sensor. does this mean I have two bad sensors in my possession?

PCM harness pin 3 and pin 6

again PCM harness pin 3 and pin 6. the other side of the harness is disconnected so shouldn't the meter show nothing or open circuit?

this is what alldata has to say.

• Key "OFF".
• Disconnect Powertrain Control Module (PCM) . Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
• Install breakout box, PCM disconnected.
• Disconnect Vehicle Speed Sensor (VSS) .
• Measure resistance between test pin 3 at the breakout box and VSS (+) circuit at the VSS vehicle harness connector.
• Measure resistance between test pin 6 at the breakout box and VSS (-) circuit at the VSS vehicle harness connector.
• Is each resistance less than 5.0 ohms?

Yes -- Go to DP3. See: DP3 - Check VSS Signal Harness For Shorts to Power or Ground
No -- Service open circuit. Remove breakout box. Reconnect all components. Repeat test step DP1 drive cycle to verify elimination of Diagnostic Trouble Code (DTC) or drive complaint. See: DP1 - Complete VSS Drive Cycle

same pic from above just with less harry arm and more meter.

I must be reading this meter wrong because i'm seeing about 22ohm right? help me out here

 

[somedude_001]

just replaced the wiring from the pcm to the sensor, and replaced the sensor. I guess next is the pcm WTF