P061C

P061C-ETC LEVEL 2 RPM PERFORMANCE

For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams. Electrical Diagrams

Theory of Operation

This diagnostic is testing for an internal ECM failure. The ECM redundantly calculates engine speed based crankcase speed sensor. This calculation is done in a different part of the ECM than the primary calculation. It detects if the primary engine speed calculation is lower than the redundant calculation by more than a calibrated amount 675 rpm for a calibrated amount of time 2 sec. The ECM will light the ETC lamp when the diagnostic runs and fails. The light will remain on for the drive cycle or until both calculations agree for 2 seconds.

- When Monitored:
Engine speed is detected.

- Set Condition:
The primary engine speed calculation differs from the redundant engine speed calculation (internal calculation) by a calibrated amount for a calibrated amount of time.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. OTHER DTCS
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Are the other DTCs?

Yes

- Repair other DTCs first.

No

- Go To 2

2. CRANK POSITION SENSOR
1. Replace the Crank Position Sensor.
2. Ignition on, engine not running.
3. With the scan tool, erase DTCs.
4. Test drive the vehicle.
5. With the scan tool, read DTCs.

Did the DTC reset?

Yes

- Replace the ECM.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

No

- Repair is complete.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test