Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Instrument Cluster Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Important: If the instrument cluster is completely inoperative, refer to Instrument Cluster Inoperative .
Does the vehicle's tachometer indicate an engine RPM? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the DMM display a voltage greater than the specified value? | 9.5 V | Go to Step 7 | Go to Step 4 |
4 |
Does the DMM display continuity? | -- | Go to Step 5 | Go to Step 9 |
5 | Test for continuity from the Tachometer signal circuit to a good ground. Refer to Testing for Continuity in Wiring Systems. Does the DMM display continuity? | -- | Go to Step 10 | Go to Step 6 |
6 | Test the instrument cluster harness connector for a poor connection to the instrument cluster. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and repair the condition? | -- | Go to Step 16 | Go to Step 15 |
7 |
Does the DMM display continuity? | -- | Go to Step 8 | Go to Step 11 |
8 | Test the continuity of the tachometer signal circuit from the VCM harness connector to a good ground using a J 39200 DMM. Refer to Testing for Continuity in Wiring Systems. Does the DMM display continuity? | -- | Go to Step 12 | Go to Step 13 |
9 | Repair the open tachometer signal circuit from the instrument cluster connector to the in line connector C101. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- |
10 | Repair the short to ground in the tachometer signal circuit from the instrument cluster connector to the in line connector C101. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- |
11 | Repair the open in the tachometer signal circuit from the VCM harness connector to the in line connector C101. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- |
12 | Repair the short to ground in the tachometer signal circuit from the VCM harness connector to the in line connector C101. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- |
13 | Test the VCM harness connector and the in line connector C101 harness connector for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 |
14 |
Important: Program the replacement VCM. Refer to VCM Replacement/Programming in Engine Controls-4.3L. Replace the VCM. Did you complete the replacement? | -- | Go to Step 16 | -- |
15 | Replace the instrument cluster. Refer to Instrument Cluster Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
16 | Operate the system in order to verify the repair. Did you find and correct the condition? | -- | System OK | Go to Step 3 |
