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.
Value(s)
Yes
No
1
Did you perform the Instrument Cluster Diagnostic System Check?
--
Go to Step 3
Go to Diagnostic System Check - Instrument Cluster
2
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
3
Does the vehicles speedometer approximately agree with the scan tool display?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
4
Does the DMM display a voltage greater than the specified value?
9.5V
Go to Step 8
Go to Step 5
5
Go to Step 6
Go to Step 10
6
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
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
8
Does the DMM display continuity?
Go to Step 9
Go to Step 12
9
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
10
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?
11
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?
12
Repair the open vehicle speed output (4K) circuit from the PCM/VCM harness connector to the in line connector C101. ?
13
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?
14
Test the PCM/VCM harness connector for poor connections. Did you find and correct the condition?
Go to Step 15
15
Important: Program the replacement PCM/VCM. Controls - 2.2L Controls - 4.3L.
Replace the PCM/VCM.
Did you complete the replacement?
16
Replace the instrument cluster. .
17
Operate the system in order to verify the repair.
Did you find and correct the condition?
System OK
Connector Part Information
Pin
Wire Color
Circuit No.
Function
A1
Not Used
A2
TAN/WHT
331
Oil Sender Sensor Signal
A3
WHT
121
Tachometer Signal
A4
DK GRN
389
Vehicle Speed Signal Input - 4,000 Pulses Per Mile
A5
BRN
41
Fuse Output - Ignition 3
A6
GRY
1036
Class 2 Serial Data
A7
PNK
39
Fuse Output - Ignition 1
A8
1020
Fuse Output - Ignition 0
A9
BLK/WHT
451
Ground for the IPC
A10
ORN
340
Fuse Output - Battery
A11
BRN/WHT
419
Check Engine Indicator Lamp Output
A12
ORN/BLK
1786
Transmission Park/Neutral Signal
B1
LT BLU/WHT
1414
Left Turn Signal Switch Input
B2
1220
Fuse Output - Instrument Panel Lamps
B3
BLK
1050
Ground
B4-B10
B11
DK BLU/WHT
1415
Right Turn Signal Switch Input
B12
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