1999 Accord 2 door V6 automatic transmission. I have a few problems.

1. The speedometer does not work. The all the other gauges work.

2. The gas light stays illuminated at all times when vehicle is on. The gas gauge works as it should.

3. The door chime/headlight warning does not work.

What I have done about the problems. Have removed all fuses and checked for corrosion.

1. Changed out 3 different gauge clusters (all from junkyard vehicles). I also checked continuity from the ecu to the cluster for the vss. Took the car to a friend that had a snap-on diagnostic computer and while driving it gave the mph on the diagnostic machine. I did check the voltage at the vss Imput on the cluster read 0.0 volts in park but when in drive at any speed read 13.8 volts no matter what speed the car was going. Also replaced both of the vss with new units not from a junkyard.

2. Nothing done to check this.

3. Replaced the icu (integrated control unit) located on the fuse box. The one I removed had some sort of salvage yard markings on it and I replaced it with one from a junkyard and it could possibly be bad. Door switches work fine and activate the dome and courtesy lights when door opens.

I hope someone could point me in the right direction here.

 

Have you checked your wiring harnesses'?
Checked all your grounds?

I would look into a wiring issues with the gauge cluster.

 

1. The speedometer drive circuit receives pulses (vehicle speed sensor output signal) from the PCM. The pulse rate increases as the car accelerates. You would need something to test for the pulses rates at the Blu/Wht wire from the PCM.

It may even be an issue with the PCM.

2. The low level indicator light staying on may be due to a faulty thermistor. The thermistor is part of the fuel sending unit, and mounted in the fuel tank.

The way the low fuel indicator light works is: When the thermistor is cool, its resistance is very high. When the thermistor’s temperature increases, its resistance decreases. Fuel in the fuel tank transfers heat away from the thermistor fast enough to keep it cool so the thermistor’s resistance stays high and the low fuel indicator light does not come on. When the fuel level drops below the thermistor, the thermistor’s temperature increases. With less and less fuel to cool it, the thermistor’s resistance decreases, eventually allowing current to flow through the low fuel indicator light and the thermistor to ground, which turns on the low fuel indicator light.

3. For the lights-on reminder, get a Honda service manual and follow the instructions on testing inputs for the driver's multiplex integrated control unit (micu).

 

The only ground I checked was for the cluster. Is there any others I need to look at?


Thanks for all the information on that. I will see if I can locate another pcm and give it a try. And I will get a service manual so I can trouble shoot the micu. Thanks again!

 

Due to the Immobilizer, a replacement PCM will need to be programmed for the car to start. So, this is not an inexpensive route to just throw a part at it.

 

I didn't know that either. Thanks for the heads up.

 

Check the grounds at the wire harness, at the intake and at the battery. Since you stated the VSS works and the ECM 'sees' it, I'm thinking there is an issue between the gauge and VSS at the harness.