Tachometer Inaccurate or Inoperative
Tachometer Inaccurate or Inoperative
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Instrument Cluster Schematics Connector End View Reference: Engine Control Module Connector End Views for the 4.4L engine or Engine Control Module Connector End Views for the 4.6L engine |
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| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 |
|
9 V | Go to Step 5 | Go to Step 4 |
| 4 | Test the engine speed signal circuit for the following:
Refer to Circuit Testing and to Wiring Repairs . 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 to Wiring Repairs
. 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 instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections
and to Connector Repairs
. 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 to Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 10 | Go to Step 9 |
| 8 | Replace the IPC. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 10 | - |
| 9 | Replace the ECM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | 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 |