P006F - Turbocharger Boost Control Supply Voltage Circuit High
Theory of Operation
The Variable Geometry Turbocharger (VGT) is electronically controlled by the Electronic Turbo Actuator. The Electronic Turbo Actuator is a smart device; it communicates information with the Powertrain Control Module (PCM) over the J1939 BUS. The Electronic Turbo Actuator performs its own internal diagnostics and reports failures back to the PCM. The PCM then decodes the error message and converts it to a fault code. The PCM lights the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles. The PCM will turn off the MIL immediately after this diagnostic runs and passes in four consecutive drive cycles.
When Monitored and Set Conditions
When Monitored: This diagnostic runs continuously when the following conditions are met:
• With the ignition on.
Set Conditions:
• The 12 Volt supplied voltage from the PCM to the VGT Actuator is above a calibrated threshold for a calibrated length of time.
Default Actions:
• The MIL will illuminate.
Possible Causes
- VGT 12 VOLT SUPPLY CIRCUIT SHORT TO VOLTAGE
- VGT RETURN CIRCUIT OPEN/HIGH RESISTANCE
- TURBOCHARGER ACTUATOR
- POWERTRAIN CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTCBased Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
Diagnostic Test
1. ACTIVE DTC
NOTE: If there are any Coolant Temperature related DTCs active, perform those diagnostics and repair before performing this diagnostic tree.
1. Turn the ignition on.
2. With the scan tool, read DTCs. Is P006F active?
Yes
• Go To 2
No
• Perform the INTERMITTENT CONDITION - DIESEL diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK THE (N639) VGT 12 VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the VGT harness connector.
3. Disconnect the PCM C1 harness connector.
4. Turn the ignition on. Wait 1 minute.
5. Measure the voltage on the (N639) VGT 12 Volt Supply circuit at the VGT harness connector. Is there voltage present?
Yes
• Repair the (N639) VGT 12 Volt Supply circuit for a short to voltage.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)
No
• Go To
3. CHECK THE (K639) VGT RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K639) VGT Return circuit between the VGT harness conector and the PCM C1 harness connector. Is the resistance above 5.0 Ohms?
Yes
• Repair the (N639) VGT 12 Volt Supply circuit for an open or 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. TURBOCHARGER ACTUATOR
1. Reconnect the PCM C1 harness connector.
2. Turn the ignition on. Wait 1 minute.
3. While monitoring the scan tool, connect a jumper wire between ground and the (N639) VGT 12 Volt Supply circuit at the VGT harness connector.
Does DTC P006E become active?
Yes
• Replace the Electronic Turbo Actuator in accordance with the Service Information.(Refer to 09 - Engine, 6.7L Diesel/Turbocharger System/ACTUATOR, Turbocharger/Removal)
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
• Go To 5
5. POWERTRAIN CONTROL MODULE
1. Disconnect all PCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
• Proper connector installation.
• Damaged connector locks.
• Corrosion.
• Other signs of water intrusion.
• Weather seal damage (if equipped).
• Bent terminals.
• Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
• Terminals that have been pushed back into the connector cavity.
• Perform a terminal drag test on each connector terminal to verify proper terminal tension. Repair any conditions that are found.
5. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Freeze Frame and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read PCM DTCs. Did the DTC return?
Yes
• Replace the Powertrain Control Module (PCM) in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Powertrain Control/Removal) .
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
• Test complete.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).