P1507

P1507-CRANKCASE FILTER RESTRICTION

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

Theory of Operation

The crankcase pressure sensor is used to monitor the pressure inside the crankcase. The Powertrain Control Module (PCM) supplies the Crankcase Pressure Sensor a 5-Volt reference voltage. When the crankcase pressure is low, the sensor signal voltage is low. When the crankcase pressure is high, the sensor signal voltage is near the 5-Volt reference voltage. The PCM monitors the Crankcase Pressure Signal Circuit voltage to calculate the pressure of the air within the crankcase. The PCM will illuminate the MIL lamp after the monitor runs and fails in two consecutive trips.

- When Monitored:
Engine speed greater than 500 RPM and engine temperature is above 82°C (180°F) for five minutes.

- Set Condition:
The Powertrain Control Module (PCM) detects the crankcase pressure exceeds a calibrated limit.





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

1. CHECK THE CRANKCASE VENTILATION HOSE
1. Disconnect the crankcase ventilation hose from the breather cover and compressor inlet plumbing.
2. Blow regulated shop air, less than or equal to 5.0 psi through the hose.

Are there any obstructions in the crankcase outlet hose?

Yes

- Clear the obstructions.
- Go To 2

No

- Go To 2

2. CRANKCASE DEPRESSION REGULATION VALVE
1. Remove the breather cover.
2. Blow regulated shop air, less than or equal to 5.0 psi through the CDR Valve.

NOTE: The air can be applied at either the inlet or outlet of the valve.

Is the Crankcase Depression Valve stuck shut?

Yes

- Replace the CDR Valve:
- Go To 3

No

- Go To 3

3. CCV FILTER ELEMENT
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Were there any obstructions in the crankcase hose and/or CDR Valve?

Yes

- Test complete.
- Turn the ignition off and wait for the PCM to power down (this will take 10 minutes). Turn the ignition on. With the scan tool, erase the DTC.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Replace the CCV Filter Element.
- Turn the ignition off and wait for the PCM to power down (this will take 10 minutes). Turn the ignition on. With the scan tool, erase the DTC.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.