• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Engine Speed Signal | B0560 | B0560 | B0560 |
The engine control module (ECM) creates the engine speed signal by pulsing the engine speed signal circuit to ground at a rate of 2 pulses per engine revolution. The instrument panel cluster (IPC) converts the engine speed signal to a tachometer position to indicate the engine speed. The IPC also receives from the ECM a serial data message indicating the engine speed. The IPC uses the serial data engine speed information from the ECM for diagnostic purposes.
• | The IPC receives a serial data message from the ECM indicating the engine speed is greater than 800 RPM. |
• | The ignition voltage is between 9-18 volts. |
• | The IPC does not detect a 2 pulses per engine revolution signal on the engine speed signal circuit. |
• | The above condition is present for at least 5 seconds. |
The IPC stores DTC B0560 in memory.
• | The DTC becomes history when the conditions for setting the DTC are no longer present. |
• | The history DTC clears after 40 malfunction-free warm-up cycles. |
Instrument Cluster Description and Operation
Control Module References for scan tool information.
⇒ | If the tachometer does not perform the IPC Gage Sweep Test, replace the IPC. |
⇒ | If less than 9 volts, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC. |
⇒ | If greater than 11 volts, test the circuit for a short to voltage. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for the ECM or IPC replacement, setup and programming