The speedometer and odometer on my 2000 chevy s10 with 2.2L engine has stopped working. When connecting to the diagnostic port the computer knows how fast the truck is going but 99% of the time the speedometer and odometer do nothing, all other guages in the instrument cluster work fine. I have tried to trace the wire using a wiring diagram but I haven't been able to find a good pin layout for where the wire should be hooked up behind the glove box and what the voltage/ohms should be when testing the wire. Any help would be greatly appreciated.
Hi and thanks for your question! Your next step will be to have the cluster tested. You will need to find a shop that has a scan tool that can do a sweep test on the cluster.
99% of the time I find a bad gauge. Then you will need to send it in for repair.
Thank You Ken
I will get the instrument cluster checked as soon as I can but I was wondering if you could tell me which pin(s) in the connector behind the dash supplies the signal to the speedometer and what the voltage/amperage/ohms should be. Also can I check this on the connector for the radio where it has the speed controlled volume option to make sure that I am not getting a signal at one point and not the other.
Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 3
Go to Diagnostic System Check - Instrument Cluster
Important: If the instrument cluster is completely inoperative, .
Does the vehicles speedometer and the scan tool both display 0 km/h (0 mph)?
Go to Step 4
Does the vehicles speedometer approximately agree with the scan tool display?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Does the DMM display a voltage greater than the specified value?
Go to Step 8
Go to Step 5
Go to Step 6
Go to Step 10
Test the continuity from the vehicle speed sensor signal (4K) circuit to a good ground. Does the DMM display continuity?
Go to Step 11
Go to Step 7
Test the instrument cluster harness connector for a poor connection to the instrument cluster. Did you find and correct the condition?
Go to Step 17
Go to Step 16
Does the DMM display continuity?
Go to Step 9
Go to Step 12
Test the continuity of the vehicle speed sensor signal (4K) circuit from the PCM/VCM harness connector to a good ground using the DMm .
Go to Step 13
Go to Step 14
Repair the open vehicle speed sensor signal (4K) circuit from the instrument cluster electrical connector to the in line connector C101. Did you complete the repair?
Important: If you cannot locate a grounded circuit, disconnect each component (one at a time) and see if the grounded condition is caused by a component on the vehicle speed sensor signal (4K) circuit. Repair the grounded vehicle speed sensor signal (4K) circuit from the instrument cluster connector to the in line connector C101. Did you complete the repair?
Repair the open vehicle speed output (4K) circuit from the PCM/VCM harness connector to the in line connector C101. ?
Repair the grounded vehicle speed output (4K) circuit from the PCM/VCM harness connector to the in line connector C101. Did you complete the repair?
Test the PCM/VCM harness connector for poor connections. Did you find and correct the condition?
Go to Step 15
Important: Program the replacement PCM/VCM. Controls - 2.2L Controls - 4.3L.
Replace the PCM/VCM.
Did you complete the replacement?
Replace the instrument cluster. .
Operate the system in order to verify the repair.
Did you find and correct the condition?
Connector Part Information
Oil Sender Sensor Signal
Vehicle Speed Signal Input - 4,000 Pulses Per Mile
Fuse Output - Ignition 3
Class 2 Serial Data
Fuse Output - Ignition 1
Fuse Output - Ignition 0
Ground for the IPC
Fuse Output - Battery
Check Engine Indicator Lamp Output
Transmission Park/Neutral Signal
Left Turn Signal Switch Input
Fuse Output - Instrument Panel Lamps
Right Turn Signal Switch Input
The speedo gets it signal on the class 2 communication wire. The modules decodes the signals. If you had a problem, all kinds of things will not work on the cluster and you will have fault codes stored in all the computers. Thank You Ken