Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Important: In order to avoid misdiagnosis, check for powertrain control module (PCM) DTCs before performing this diagnosis. Refer to Powertrain On Board Diagnostic (OBD) System Check (3.8L) or Powertrain On Board Diagnostic (OBD) System Check (5.7L). | ||||
1 | Did you perform the Diagnostic System Check? | -- | ||
2 | Drive the vehicle. Does the speedometer display the correct speed? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |
3 |
Does the speedometer measure approximately 87 kph (54 mph)? | 87 kph (54 mph) | ||
4 | Test for and repair a poor connection in circuit 817 at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and repair a poor connection? | -- | ||
5 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming (3.8L) or Powertrain Control Module Replacement/Programming (5.7L). Did you complete the repair? | -- | -- | |
6 |
Does the test lamp illuminate? | -- | ||
7 | Repair the short to battery voltage in circuit 817. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
8 | Connect a test lamp from the PCM connector circuit 817 to battery voltage. Refer to Circuit Testing in Wiring Systems. Does the test lamp illuminate? | -- | ||
9 | Repair the short to ground in circuit 817. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
10 |
| -- | ||
11 | Test for and repair a poor connection in circuit 817 at the instrument cluster. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and repair a poor connection? | -- | ||
12 | Replace the instrument cluster. Refer to Instrument Cluster Replacement . Did you complete the repair? | -- | -- | |
13 | Repair an open or a poor connection in circuit 817 between the instrument cluster and the PCM. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
14 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | |
