Use this procedure under the following conditions:
Use this procedure if another procedure has directed you here. Use this procedure if any of the following diagnostic codes are active:
- 526-5 Turbo Wastegate Drive current low
- 526-6 Turbo Wastegate Drive current high
Some engine models will have a turbocharger with an electronically controlled wastegate. Typically, the wastegate is a mechanical valve that is used in the turbocharger in order to regulate the intake manifold pressure to a set value.
The control system for the electronically controlled wastegate precisely regulates the intake manifold pressure by using a wastegate regulator to control the wastegate.
The required intake manifold pressure is calculated by the software that is contained in the Electronic Control Module (ECM). The ECM uses the wastegate regulator to control the wastegate in order to provide the precise value of intake manifold pressure. The wastegate regulator is controlled by a PWM signal from the ECM.
If there is a fault with the wastegate regulator, one of the following conditions must be met in order for these diagnostic codes to be active:
- The "Turbo Wastegate Solenoid Output" is active.
- The ECM is controlling boost with the wastegate regulator during normal operation.
Note: Attempting to defeat the wastegate could cause a permanent derate. Factory passwords will be required to return full power to the engine.
| Pin Connections | ||
| Sensor Pin | Function | P2 Pin Connection |
| 1 | Ground | 44 |
| 2 | Signal | 17 |
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| Illustration 1 | g01806857 |
Schematic for the wastegate regulator | |
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| Illustration 2 | g01806859 |
Typical view of the pin locations on the P1 connector for the wastegate regulator (17) Wastegate pulse width modulation (PWM) signal (44) Wastegate return | |
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| Illustration 3 | g01806858 |
View of the connector for the Wastegate regulator (1) Ground (GND) (2) Signal (SIG) | |
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| Illustration 4 | g01806873 |
Wastegate regulator (1) Wastegate regulator | |
Test Step 1. Check for Diagnostic Codes
- Turn the keyswitch to the OFF position.
- Connect the electronic service tool to the diagnostic connector.
- Turn the keyswitch to the ON position. Start the electronic service tool.
- Monitor the electronic service tool for active diagnostic codes and/or logged diagnostic codes.
Expected Result:
One or more diagnostic codes are active or logged.
Results:
- 526-5, 526-6 are active and/or logged - Proceed to Test Step 2.
- No Codes - The fault seems to be eliminated.
Repair: For intermittent faults, refer to Troubleshooting, "Electrical Connectors - Inspect".
STOP
Test Step 2. Inspect Electrical Connectors and Wiring
- Thoroughly inspect the P2/J2 connectors and the P511 connector for the wastegate regulator. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
- Perform a 45 N (10 lb) pull test on each of the wires that are associated with the wastegate solenoid.
- Check the screw for the ECM connector for the correct torque of 5.0 N·m (44 lb in).
Expected Result:
All connectors, pins, and sockets are completely coupled and/or inserted and the harness is free of corrosion, abrasion, and pinch points.
Results:
- OK - The harness is OK. Proceed to Test Step 3.
- Not OK - There is a fault in the connectors and/or the harness.
Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the fault.
STOP
Test Step 3. Determine the Diagnostic Code that is Active
- Turn the keyswitch to the ON position. Access the "Diagnostics Tests" on the electronic service tool. Activate the "Turbo Wastegate Solenoid Test". Wait at least 30 seconds in order for the result to be displayed.
- Determine if the fault is related to either of the following:
- "Low current" (open circuit)
- "High current" (short circuit)
- "Low current" (open circuit)
Expected Result:
The electronic service tool displays no diagnostic codes.
Results:
- OK - There are no active codes.
Repair: The original codes may have been caused by a loose connector. If this is an intermittent fault, refer to Troubleshooting, "Electrical Connectors - Inspect".
STOP
- Not OK - Diagnostic code 526-5 is active at this time. Proceed to Test Step 4.
- Not OK - Diagnostic code 526-6 is active at this time. Proceed to Test Step 6.
Test Step 4. Create a Short Circuit in the Harness at the Solenoid
- Turn the keyswitch to the OFF position.
- Disconnect the P511 connector for the wastegate regulator.
- Fabricate a jumper wire between P511:1 and P511:2 in order to create a short circuit.
- Turn the keyswitch to the ON position. Access the "Diagnostics Tests" on the electronic service tool. Activate the "Turbo Wastegate Solenoid Test". Wait at least 30 seconds in order for the result to be displayed.
- Check for active diagnostic codes on the electronic service tool.
Expected Result:
The 526-6 diagnostic code is now active.
Results:
- OK - The 526-6 diagnostic code is now active. There is a fault with the solenoid in the wastegate regulator.
Repair: Perform the following procedure:
- Temporarily connect a replacement wastegate regulator.
- Turn the keyswitch to the ON position. Access the "Diagnostics Tests" on the electronic service tool. Activate the "Turbo Wastegate Solenoid Test". Wait at least 30 seconds in order for the result to be displayed.
- If the diagnostic test is successful, install the replacement wastegate regulator.
STOP
- Not OK - The low current diagnostic code (open circuit) is still active. Proceed to Test Step 5.
Test Step 5. Create a Short Circuit at the ECM
- Turn the keyswitch to the OFF position.
- Temporarily remove the wires from P2:17 and P2:44.
- Fabricate a jumper wire between P2:17 and P2:44 in order to create a short circuit.
Note: P2/J2 must be connected during the next step.
- Turn the keyswitch to the ON position. Access the "Special Tests" under the "Diagnostics" menu on the electronic service tool. Activate the "Turbo Wastegate Solenoid Output Test" on the electronic service tool. Wait at least 30 seconds for activation of the diagnostic codes.
- Check for active diagnostic codes on the electronic service tool.
Expected Result:
The 526-6 diagnostic code is now active.
Results:
- OK - The 526-6 diagnostic code is now active. There is a fault in the harness between the ECM and the solenoid.
Repair: Repair the harness or replace the harness.
STOP
- Not OK - There is still an open circuit diagnostic code.
Repair: Perform the following repair:
- Make sure that the latest flash file for the application is installed in the ECM. Refer to Troubleshooting, "Flash Programming".
- Contact the Technical Communicator.
Note: This consultation can greatly reduce the repair time.
- If the Technical Communicator recommends the use of a test ECM, install a test ECM. Refer to Troubleshooting, "Replacing the ECM".
- Use the electronic service tool to recheck the system for active diagnostic codes.
- If the fault is resolved with the test ECM, reconnect the suspect ECM.
- If the fault returns with the suspect ECM, replace the ECM.
- Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.
STOP
Test Step 6. Disconnect the Solenoid in order to Create an Open Circuit
- Turn the keyswitch to the OFF position.
- Disconnect the P511 connector for the wastegate regulator in order to create an open circuit.
- Turn the keyswitch to the ON position. Access the "Special Tests" under the "Diagnostics" menu on the electronic service tool. Activate the "Turbo Wastegate Solenoid Output Test" on the electronic service tool. Wait at least 30 seconds for activation of the diagnostic codes.
- Check for active diagnostic codes on the electronic service tool.
Expected Result:
The 526-5 diagnostic code is now active.
Results:
- OK - The 526-5 diagnostic code is now active.
Repair: There is a short in the solenoid for the wastegate regulator.
- Temporarily connect a replacement wastegate regulator.
- If the fault is eliminated, reconnect the suspect wastegate regulator. If the fault returns, permanently install the replacement wastegate regulator.
STOP
- Not OK - There is still a 526-6 diagnostic code. Proceed to Test Step 7.
Test Step 7. Create an Open Circuit at the ECM
- Turn the keyswitch to the OFF position.
- Remove the wires from P2:17 and P2:44 in order to create an open circuit at the ECM.
- Turn the keyswitch to the ON position. Access the "Special Tests" under the "Diagnostics" menu on the electronic service tool. Activate the "Turbo Wastegate Solenoid Output Test" on the electronic service tool. Wait at least 30 seconds for activation of the diagnostic codes.
- Check for active diagnostic codes on the electronic service tool.
Expected Result:
526-5 diagnostic code is now active.
Results:
- OK - The 526-5 diagnostic code is now active. There is a short circuit in the harness between the ECM and the solenoid.
Repair: Repair the harness or replace the harness.
STOP
- Not OK - The 526-6 diagnostic code is still present.
Repair: Perform the following repair:
- Make sure that the latest flash file for the application is installed in the ECM. Refer to Troubleshooting, "Flash Programming".
- Contact the Technical Communicator.
Note: This consultation can greatly reduce the repair time.
- If the Technical Communicator recommends the use of a test ECM, install a test ECM. Refer to Troubleshooting, "Replacing the ECM".
- Use the electronic service tool to recheck the system for active diagnostic codes.
- If the fault is resolved with the test ECM, reconnect the suspect ECM.
- If the fault returns with the suspect ECM, replace the ECM.
- Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.
STOP
- Not OK - Repeat the diagnostic procedure from Test Step 1.