Tachometer Inaccurate or Inoperative (Diesel 6.6L)
Tachometer Inaccurate or Inoperative (Diesel 6.6L)
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Instrument Cluster Schematics | ||||
| 1 | Did you perform the Instrument Cluster. Diagnostic System Check? | - | Go to Step 2 | Go to Diagnostic System Check - Instrument Cluster |
| 2 |
|
- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 |
|
9.5 V | Go to Step 5 | Go to Step 4 |
| 4 | Test the engine speed signal circuit for an open, a short to ground or a high resistance. Refer to Circuit Testing
, and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 10 | Go to Step 6 |
| 5 | Test the engine speed signal circuit for a short to voltage. 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 ECM. 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:
Replace the ECM. Refer to Engine Control Module Replacement
in Engine Controls - 6.6L.Did you complete the replacement?Program the replacement ECM. |
- | Go to Step 10 | - |
| 10 | Operate the system in order to verify the repair. Did you correct the condition? |
- | System OK | Go to Step 2 |