speedo not working
Discussion
This is taken from the manual:
18. Intermitted Erratic, or Inoperative Speedometer
It has come to our attention that under certain conditions moisture can build up in the speedometer sensor plug under the dash, if this should occur, erratic or no speedometer operation can result.
Under humid driving conditions, exiting and entering the vehicle can cause the A/C expansion valve and evaporator lines to sweat heavily. This condensation can drip onto electric components under the A/C unit. If this moisture enters the speedometer sensor plug, it can fowl up or even block the signal all together.
To correct this problem A/C insulation tape can be used to seal the expansion valve from the humid air.
To check for this condition, remove the fuse/relay access panel in the passenger side foot well.
Check for a wet carpet directly under the expansion valve on the left side of the A/C box.
Separate the speedometer plug and check for moisture inside the plug.
Any of these conditions indicates the likelihood of condensation dripping from the expansion valve above.
Note: This should be check when these symptoms are occurring. If the car sits any length of time these area can dry out and the problem may go away.
Might be worth checking
18. Intermitted Erratic, or Inoperative Speedometer
It has come to our attention that under certain conditions moisture can build up in the speedometer sensor plug under the dash, if this should occur, erratic or no speedometer operation can result.
Under humid driving conditions, exiting and entering the vehicle can cause the A/C expansion valve and evaporator lines to sweat heavily. This condensation can drip onto electric components under the A/C unit. If this moisture enters the speedometer sensor plug, it can fowl up or even block the signal all together.
To correct this problem A/C insulation tape can be used to seal the expansion valve from the humid air.
To check for this condition, remove the fuse/relay access panel in the passenger side foot well.
Check for a wet carpet directly under the expansion valve on the left side of the A/C box.
Separate the speedometer plug and check for moisture inside the plug.
Any of these conditions indicates the likelihood of condensation dripping from the expansion valve above.
Note: This should be check when these symptoms are occurring. If the car sits any length of time these area can dry out and the problem may go away.
Might be worth checking
I was just about to type something similar, also if you take the wheel off, the sensor is screwed into the hub and spaced 1-1.5 mm away from the rotor, from memory if you wipe the sensor you will see a red LED, this should flash as you rotate the hub slowly, if it lights the chances are it is a wiring fault, probably water ingress, causing corrosion, it is then a case of checking the connector pins under the relay panel and maybe the plug in th eback of the speedo.
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