P00AF - Turbocharger Boost Control Module Performance

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 Electronic Turbo Actuator has detected an internal error in the Variable Geometry Turbocharger (VGT) smart device.

Default Actions:

• The MIL is illuminated.

Possible Causes

• Electronic Turbo Actuator Wiring Harness
• Electronic Turbo Actuator

Diagnostic Test

1. OTHER DTCS

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

Is U010C active?

Yes
• Repair U010C first.

• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

No

• Go To 2

2. ELECTRONIC TURBO ACTUATOR
1. Turn ignition off.
2. Disconnect the Electronic Turbo Actuator harness connector.
NOTE: Check connectors - Clean/repair as necessary. Are there dirty or damaged pins?

Yes
• Repair/Replace as necessary.
• Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

No
• Replace the Turbocharger 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).