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 PCM/VCM harness connector to a good ground using a 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 to connector C100. 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 to connector C100. 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 PCM/VCM to connector C100. 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 PCM/VCM to connector C100. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- |
13 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 |
14 |
Important: Program the replacement PCM/VCM. Refer to VCM Replacement/Programming in Engine Controls - 4.3L or Powertrain Control Module Replacement in Engine Controls - 4.8L, 5.3L and 6.0L. Replace the PCM/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 |
