The PCM creates the engine speed signal by pulsing the signal circuit to ground at the rate of 2 pulses per engine revolution. The IPC converts the signal to a tachometer position. The IPC also receives a class 2 message from the PCM indicating the engine speed. The IPC uses this class 2 message for diagnostic purposes.
• | The IPC receives a class 2 message from the PCM indicating that the engine speed is greater than 800 RPM. |
• | The ignition voltage is between 9.0 volts and 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 5.0 seconds. |
The IPC stores a DTC B0560 in memory.
• | A 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 | Values | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Instrument Cluster Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems | ||||||||||
1 | Did you perform the Instrument Cluster Diagnostic System Check? | -- | Go to Step 2 | |||||||
2 |
Does the Engine Speed parameter match the tachometer display? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||||
3 |
Does the voltage measure greater than the specified value? | 9.0 V | Go to Step 4 | Go to Step 5 | ||||||
4 | Test the engine speed signal circuit for a short to voltage. Refer to Circuit Testing and to 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 an open or for a short to ground. Refer to Circuit Testing and to 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 PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to 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 IPC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 | ||||||
8 |
Important: Program the replacement PCM. Replace the PCM. Refer to:
Did you complete the replacement? | -- | Go to Step 10 | -- | ||||||
9 |
Important: Program the replacement IPC Replace the IPC. Refer to Instrument Cluster Replacement .Did you complete the replacement? | -- | Go to Step 10 | -- | ||||||
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |