Speedometer and/or Odometer Inaccurate or Inoperative. Chevrolet Corvette 2003

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2003 🢒 Corvette 🢒 Engine 🢒 Engine Controls - 5.7L 🢒 Speedometer and/or Odometer Inaccurate or Inoperative

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

This step tests for the proper vehicle speed signal from the PCM.

Step	Action	Value(s)	Yes	No
Schematic Reference: Instrument Cluster Schematics
1	Did you perform the IPC Diagnostic System Check?	--	Go to Step 2	Go to Diagnostic System Check - Instrument Cluster
2	Install a scan tool. Raise the vehicle's drive wheels. Refer to Lifting and Jacking the Vehicle in General Information. Start the engine. Place the transmission into drive for automatic transmission and third gear for manual transmission. With the scan tool, observe the Vehicle Speed parameter in the PCM Engine Data 1 data list. Does the Vehicle Speed parameter match the speedometer display?	--	Go to Step 3	Go to Step 4
3	Does the odometer operate properly?	--	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 8
4	Turn the ignition OFF. Disconnect the PCM connector C2. Turn the ignition ON, with the engine OFF. Measure the voltage from the vehicle speed signal circuit to a good ground. Does the voltage measure greater than the specified value?	9.6 V	Go to Step 6	Go to Step 5
5	Test the vehicle speed signal circuit for an open, a short to ground, or a high resistance between the IPC and the PCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 10	Go to Step 7
6	Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 10	Go to Step 8
7	Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 10	Go to Step 9
8	Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the replacement?	--	Go to Step 10	--
9	Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls. Did you complete the replacement?	--	Go to Step 10	--
10	Operate the system in order to verify the repair. Use the scan tool in order to clear the DTC's that may have set in other modules during diagnosis. Did you correct the condition?	--	System OK	Go to Step 2