P0219

P0219-ENGINE OVERSPEED

For complete wiring diagrams refer to Diagrams/Electrical.


Theory of Operation

The crankshaft position and camshaft position sensors are hall effect type sensors. The ECM provides a 5-volt supply to the position sensor and return circuit. As the teeth on the crankshaft speed ring or the dimples in the back of the camshaft gear move past the position sensor, a signal is generated on the position sensor circuit. The ECM interprets this signal and converts it to an engine speed. A missing tooth on the crankshaft gear is sued to determine the position of the engine by the ECM. A MIL lamp will be lit immediately after this diagnostic runs and fails. While the engine speed is above the overspeed threshold, we shutdown the fueling to the engine. When the engine speed drops below the overspeed threshold, fueling returns as normal. The MIL lamp will turn off once the diagnostic runs and passes in 4 consecutive drive cycles.

- When Monitored:

While the engine is running.

- Set Condition:

The ECM detects engine speed is above a calibrated threshold.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test


1. OTHER DTC'S

Turn the ignition on.

With the scan tool, read and record the freeze frame data.

With the scan tool, read the Engine DTC's.

Is there other Crankshaft position sensor DTC's set?

Yes

- Refer to symptom list for problems related to the other Crankshaft position sensor DTC's.

No

- Go To 2

2. MECHANICAL OVERSPEED OF ENGINE

Visually inspect the engine for signs of mechanical overspeed. Such as, bent push rod, broken rocker arms, bent valves, etc.

Did you notice any overspeed damage?

Yes

- Repair or replace any damaged components.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Test Complete.