P04E2 - Crankcase Ventilation Hose Connection Sensor Circuit Low
When Monitored:
Ignition on and battery voltage above 10.4 Volts.
Set Condition:
The Crankcase Hose Pressure Signal sent to the Powertrain Control Module is below a calibrated threshhold. The Powertrain Control Module (PCM) will illuminate the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles.
Possible Causes
CRANKCASE HOSE PRESSURE SIGNAL CIRCUIT SHORT TO GROUND
CRANKCASE HOSE PRESSURE SIGNAL CIRCUIT OPEN/HIGH RESISTANCE
CRANKCASE HOSE PRESSURE SENSOR
POWERTRAIN CONTROL MODULE (PCM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
Diagnostic Test
1. DTC ACTIVE
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Start the engine and let idle for one minute.
6. With the scan tool, read DTCs.
Did the DTC return?
Yes
• Go To 2
No
• Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK THE (K664) CRANKCASE HOSE PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Crankcase Hose Pressure Sensor harness connector.
3. Disconnect the PCM C1 harness connector.
4. Measure the resistance between ground and the (K664) Crankcase Hose Pressure Signal circuit at the Crankcase Hose Pressure Sensor harness connector.
Is the resistance below 10k Ohms?
Yes
• Repair the (K664) Crankcase Hose Pressure Signal circuit for a short to ground.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
• Go To 3
3. CHECK THE (K664) CRANKCASE HOSE PRESSURE SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K664) Crankcase Hose Pressure Signal circuit between the Crankcase Hose Pressure Sensor harness connector and the PCM C1 harness connector.
Is the resistance below 10k Ohms?
Yes
• Repair the (K664) Crankcase Hose Pressure Signal circuit for an open/high resistance.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
• Go To 4
4. CHECK THE CRANKCASE HOSE PRESSURE SENSOR
1. Reconnect the PCM C1 harness connector.
2. Turn the ignition on.
3. While monitoring the scan tool, use a jumper to connect the (F857) 5-Volt Supply circuit to the (K664) Crankcase Hose Pressure Signal circuit at the Crankcase Hose Pressure Sensor harness connector.
Does the scan tool display DTC P04E3 active?
Yes
• Replace the Crankcase Hose Pressure Sensor in accordance with the service information.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
• Replace the Powertrain Control Module in accordance with the service information.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).