Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Instrument Cluster Diagnostic System Check? | -- | Go to Step 2 | |||||||||
2 |
Does the scan tool indicate that the Engine Speed parameter is the same as the tachometer? | -- | Go to Step 5 | Go to Step 3 | ||||||||
3 | Test the tachometer signal for one of the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 4 | ||||||||
4 | Inspect for poor connections at the harness connector of the instrument cluster (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 8 | Go to Step 6 | ||||||||
5 | 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 8 | Go to Step 7 | ||||||||
6 | Replace the instrument cluster (IPC). Refer to Instrument Cluster Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- | ||||||||
7 |
Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 4.6L. Did you complete the replacement? | -- | Go to Step 8 | -- | ||||||||
8 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
