P0500 vss and no speedo - Honda-Tech - Honda Forum Discussion

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P0500 vss and no speedo

Old 01-10-2019, 07:59 AM
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Default P0500 vss and no speedo

Issue/ car: 1997 civic lx. Stock
d16y7 with z6 intake manifold. Rebuilt motor and replaced clutch. Speedometer does not work, live data from ecu shows 0? Mph. P0500 is displayed showing vss electrical fault.

In addition to pulling the motor and trans I power washed the trans with the sensor in it. Sensor has been replaced twice with no change in result.

Also dash board was removed and replaced German dash. Possible kink in dash wiring?

Testing:
Pulled back engine harness to check wiring and connectors. Replaced vss connector with no change in result

Tested 12v at blue/white wire to vss plug
tested 5v at black/yellow wire at vss plug
tested ground to black at vss plug

Tested continuity to dash blue/white wire to sensor blue white wire. Continuity good

Tested continuity from ecu plug blue/white wire to sensor blue/white wire. Continuity good

Tested continuity from dash blue/white wire to ecu blue/white wire. No continuity


question
Now I need to know the path of the wire circuit, I know the vss is fed 12v from fuse 15, I believe the path takes it across the dash to the ecu and then to the sensor.

I know the ecu measures resistance between the blue/white and brown yellow to get signal, however there is no description of how to test brown/yel for continuity.

Last edited by chrysler kid; 01-10-2019 at 08:17 AM.
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Old 01-10-2019, 08:50 AM
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Default Re: P0500 vss and no speedo

Let me see if there is a diagram
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Old 01-10-2019, 09:00 AM
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Default Re: P0500 vss and no speedo

How did you verify 5v on blu/wht wire? Did you test it at the ecu?

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Old 01-10-2019, 09:44 AM
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Default Re: P0500 vss and no speedo

Tested this method








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Old 01-10-2019, 09:47 AM
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Default Re: P0500 vss and no speedo

I'm going to re-test again tonight to make sure I'm not remembering wrong, but I thought the blue/white was 12v and black yellow was 5v. If those were my results it means I had a wire crossed
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Old 01-10-2019, 09:56 AM
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Default Re: P0500 vss and no speedo

While your in there take a can of compressed air to the vss sensor, use electric cleaning solution and apply di-electric grease. Also clean the vss plug too. Another diagram I looked at shows the blu/wht wire going to c103, or c130. Check there too. Above the ecu or might be that brown rectangle connector on the engine harness.
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Old 01-10-2019, 10:22 AM
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Default Re: P0500 vss and no speedo

Yeah I did that already when I replaced the connector.



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Old 01-10-2019, 01:29 PM
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Default Re: P0500 vss and no speedo

Bad connection between terminals and pins?
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Old 01-10-2019, 03:50 PM
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Default Re: P0500 vss and no speedo

A common cause for P0500 is corroded pins in the VSS sensor connector.

Last edited by muellersfan; 01-10-2019 at 07:02 PM.
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Old 01-10-2019, 05:46 PM
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Default Re: P0500 vss and no speedo

depin and take pics.
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Old 01-10-2019, 06:45 PM
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Default Re: P0500 vss and no speedo

Depin what? Ive used 2 different brand new connectors and 2 different brand new sensors
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Old 01-10-2019, 07:16 PM
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Default Re: P0500 vss and no speedo

1.2.3




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Old 01-10-2019, 07:17 PM
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Default Re: P0500 vss and no speedo

Did you test to the connector I suggest earlier?
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Old 01-10-2019, 07:24 PM
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Default Re: P0500 vss and no speedo

C130....
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Old 01-10-2019, 07:29 PM
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Old 01-10-2019, 09:02 PM
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Default Re: P0500 vss and no speedo

Dash





Ecu











3 sensors. I'll order another, that's the only logical conclusion. The flow chart is not very good for ecu testing. It asks if voltage fluctuates and the both yes and no answers state to replace the ecu



Last edited by chrysler kid; 01-10-2019 at 10:06 PM.
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Old 01-10-2019, 09:15 PM
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Default Re: P0500 vss and no speedo

Originally Posted by tony_2018 View Post
I can't find that connector. Location of it?



Edit, ok I see it. How should I test it. It seems like I should not have 12 volts at the dash or ecu ? Why do I get 5 volts at the sensor



Last edited by chrysler kid; 01-10-2019 at 10:23 PM.
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Old 01-10-2019, 10:29 PM
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Default Re: P0500 vss and no speedo

Its not suppose to show 12v, its only suppose to show voltage when the wheels are spinning. Or per fsm, turn the left wheel and then test for voltage.
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Old 01-10-2019, 11:42 PM
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Default Re: P0500 vss and no speedo

Yeah youre right. Ive got a short into a power source in the blue/white wire or my ecu is bad

Why the fuc does the plug to the sensor show 5 volts and the plug to the ecu and dash show 12
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Old 01-11-2019, 02:59 AM
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Default Re: P0500 vss and no speedo

Measure ohms of the blue/white wire from C130 inside the car to the sensor plug. Do this (and all ohm tests) with the circuit de-energized, that is the key off and the battery disconnected.

If you find the circuit is broken (it should be near zero ohms), the first place to check is of course the intake manifold bracket, since this is one of the wires affected by the fuse 15 problem.

The sensor puts out pulses while the car is moving. When the wheels are stopped, the output may stop at zero or at 12 volts. The important thing is that it pulses when the wheels are turning. So the test to jack up one wheel, put transmission in neutral and turn the wheel by hand is important.
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Old 01-11-2019, 06:07 AM
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Default Re: P0500 vss and no speedo

Originally Posted by tony_2018 View Post
its only suppose to show voltage when the wheels are spinning
Not trying to trigger you (), but this^ is not how the VSS circuit works.

Originally Posted by chrysler kid View Post
Why the fuc does the plug to the sensor show 5 volts and the plug to the ecu and dash show 12
The ECU and speedometer (also cruise control) separately supply reference voltages (~5V) to the VSS, which in turn grounds the reference voltages at frequencies that correlate to car velocity (mph) at the wheels. The reference voltage (12V) supplied by the ECU is clearly higher than expected. If you depin the VSS wire from the ECU connector to eliminate the ECU reference voltage from the VSS circuit, does the speedometer now work?



Last edited by muellersfan; 01-11-2019 at 06:27 AM.
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Old 01-11-2019, 08:37 AM
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Default Re: P0500 vss and no speedo

Ah, if going by his OP he has continuity to the cluster but not the ecu. So theres a break probably at c130 as that seems to be where it goes to the ecu correct?
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Old 01-11-2019, 08:45 AM
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Default Re: P0500 vss and no speedo

The way you post reminds me of RonJ, oh where is that member now?
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Old 01-11-2019, 08:50 AM
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Default Re: P0500 vss and no speedo

Originally Posted by tony_2018 View Post
Ah, if going by his OP he has continuity to the cluster but not the ecu. So theres a break probably at c130 as that seems to be where it goes to the ecu correct?
There's not one problem in the circuit. There are many.

Continuity between speedometer and VSS should allow the speedometer to work, so there must be a second problem in the VSS-speedo circuit, possibly the speedometer itself or the VSS. Third and fourth separate problems are in the VSS-ECU circuit, which include abnormally high ECU reference voltage and the lack of VSS-ECU continuity (broken wire or internal C130 junction connector issue). Don't expect the solution of this P0500 issue to be simple.
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Old 01-11-2019, 08:52 AM
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Default Re: P0500 vss and no speedo

Originally Posted by tony_2018 View Post
The way you post reminds me of RonJ, oh where is that member now?
Vanished!
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