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12-04-2020
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#1 |
 Join Date: Mar 2017
Location: Toronto Canada
Posts: 34
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Speedo not working
Stuck at 0
Anyone have same issue and corrected it? Last edited by jaykran; 12-04-2020 at 01:14 PM. |
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12-04-2020
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#2 |
 
Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,566
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Re: Speedo not working
You need to first confirm that the speedometer gear is turning and the VSS is sending a signal to the instrument panel.
If that is happening then you likely will be removing your cluster and having the board or circuits repaired. The manual has a diagnostic procedure for these steps. Keep us posted. Good Luck!  Marty |
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12-04-2020
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#3 |
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Join Date: Jul 2020
Location: Nashville TN
Posts: 302
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Re: Speedo not working
Check if you get any reading on HVAC control display. Hold temp up and down arrows until you get 00 on display. Then tap up arrow until 07. Then press the fan auto button in the middle.
Now drive and see if you get a reading. |
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12-04-2020
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#4 | |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Speedo not working
Quote:
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__________________
90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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12-06-2020
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#5 |
 Join Date: May 2007
Location: Addison IL
Posts: 239
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Re: Speedo not working
The most common cause for the speedometer to read zero is an open coil in the sensor. Unplug the sensor and measure the resistance at the pins. It should be about 500 ohms. If you measure infinity, or open circuit, the sensor coil is open. If the sensor tests good, perform the same resistance measurement at the ECM connector. Remove connector A and measure between pin 6, yellow wire and pin 11, purple wire. If the resistance is much higher than 500 ohms there is an open circuit between the ECM and the sensor.
The current Standard Motor Products part number for the '91 - '95 sensor is SC12. The '90 sensor has a different connector and is not available. The workaround for a '90 is to use the '91 - '95 sensor and change the connector. |
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07-11-2021
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#6 |
 
Join Date: Sep 2008
Location: Speedway, IN
Posts: 124
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Re: Speedo not working
Just replaced the VSS in my 91. As a heads up, Corvette Central was able to provide the AC Delco part, although did list as 94-96 use. Sent them an email advising wider use. Thanks for the great post Marc!
Sent from my iPhone using ZR-1 Net Registry |
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Linear Mode
