The instrument panel cluster (IPC) monitors the vehicle speed signal to determine the speedometer position. If the IPC determines the vehicle speed signal voltage is out of the normal operating range, a DTC will set.
This diagnostic procedure supports the following DTC:
DTC B0540 Speedometer Circuit
• | The vehicle speed is more than 10 km/h (6 mph). |
• | The ignition voltage is between 9-18 volts. |
• | The IPC detects that the commanded state of the driver and the actual state of the control circuit do not match. |
• | The condition above must be present for a minimum of 5 seconds. |
• | The IPC stores a DTC B0540 in memory. |
• | The speedometer defaults to 0 km/h (0 mph). |
• | No driver warning message will be displayed for this DTC. |
• | The history DTC clears after 100 malfunction free warm-up cycles. |
• | The DTC becomes history when the conditions for setting the DTC are no longer present. |
• | The IPC receives the clear code command from the scan tool. |
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Instrument Cluster Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the Vehicle Speed Sensor parameter match the speedometer display? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 |
Does the vehicle speedometer indicate a reading? | Go to Step 5 | Go to Step 4 |
4 | Test the vehicle speed signal circuit for an open, short to voltage or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
5 | Inspect for poor connections at the PCM connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
6 | Inspect for a poor connection at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
7 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | 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 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |