Operation CHARM: Car repair manuals for everyone.
Home >> Chevy Truck >> 2006 >> Express 3500 V8-6.6L DSL Turbo VIN 2 >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0045

P0045



DTC P0045

Diagnostic Instructions

- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0045: Turbocharger Boost Control Solenoid Control Circuit

Diagnostic Fault Information






Circuit/System Description

The position of the turbocharger vanes is controlled by the engine control module (ECM). The ECM utilizes a turbocharger vane control solenoid valve and a turbocharger vane position sensor to control the turbocharger vanes. The ECM will vary the boost dependant upon the load requirements of the engine. The vane control solenoid valve has 2 circuits, a high control circuit and a low control circuit. The ECM uses a pulse width modulation on the control circuits to open and control the solenoid valve.

Conditions for Running the DTC

- The engine run time is more than 60 seconds.
- DTC P0045 runs continuously when the above condition is met.

Conditions for Setting the DTC

- The control module detects that the commanded state of the driver and the actual state of the control circuit do NOT match.
- The above condition exists for more than 1 second.

Action Taken When the DTC Sets

DTC P0045 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0045 is a Type B DTC.

Diagnostic Aids

- If there is a loss of ignition voltage to terminal C1-76 at the ECM this DTC may set. Verify the circuit is not shorted to ground, open, or has an open supply fuse.
- Engine running, increase the engine speed to 1,500 RPM and maintain. With a scan tool, command the TC Vane Pos. Ctrl. Solenoid ON and OFF. The TC Vane Position Sensor parameter should increase to 95-97 percent when the TC solenoid is commanded ON and decrease to near 0 percent when commanded OFF.

Special Tools
- J 34730-405 Injector Test Lamp

Circuit/System Verification

1. If DTCs P0652, P0653, P0698, P0699, P2564, or P2565 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
2. Engine running, increase the engine speed to 1,500 RPM and maintain. Command the TC Vane Pos. Ctrl. Solenoid ON and OFF with a scan tool. Observe the Vane Position Sensor parameter. The TC Vane Position Sensor parameter should increase to 95-97 percent and decrease to near 0 percent when commanded ON and OFF.
3. Engine running, observe the TC Vane Position Sensor and the Desired TC Vane Position parameters with a scan tool. Slowly increase the engine speed from idle to 2,500 RPM, and slowly return the engine to idle speed. The TC Vane Position Sensor parameter should remain near or equal to the Desired TC Vane Position parameter throughout the engine speed range.
4. Engine running, observe the TC Vane Position Sensor and the Desired TC Vane Position parameters while increasing the TC vane pone position in 5 percent increments from 0-100 percent with a scan tool. The parameters should remain within 2 percent of each other during the entire range.
5. Engine running, observe the DTC information with a scan tool. DTC P0045 should not set.
6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note: You must perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

1. Ignition OFF, allow sufficient time for the ECM to power down.
2. Disconnect the harness connector at the TC vane position solenoid.
3. Ignition ON, verify that a test lamp illuminates between the TC high control circuit terminal A and ground.
-> If the test lamp does not illuminate, test the high control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
4. Connect the test lamp between the high control terminal A and the low control circuit terminal B.

Note: When the engine coolant temperature is less than 70�C (158�F), the test lamp will change brightness when commanded with a scan tool. When the ECM is attempting a TC Learn, the test lamp will flash ON and OFF without commands from a scan tool.

5. Engine running, engine coolant temperature (ECT) sensor 1 must be less than 70�C (158�F). Command the TC Vane Pos. Ctrl. solenoid ON and OFF with a scan tool. The test lamp should illuminate and change from bright to dim when changing between the commanded states.
-> If the test lamp does not illuminate, test the low control circuit terminal B for an open/high resistance or a short to voltage. If the circuit tests normal, replace the ECM.
-> If the test lamp remains illuminated, test the low control circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
6. Engine running, observe the TC Vane Pos. Ctrl. Solenoid Amperage parameter for a value of 0.4-1.1 amps.
-> If the value is less than 0.4 amp, test the high control circuit for a short to voltage.
7. Ignition OFF, disconnect the harness connectors at the ECM, TC vane position sensor, and the TC vane position solenoid.
8. Test for less than 5 ohms of resistance on all circuits between the following terminals:
- The ECM C1 solenoid high control circuit terminal 48 to TC solenoid terminal A.
- The ECM C1 solenoid low control circuit terminal 96 to TC solenoid terminal B.
- The ECM C1 sensor signal circuit terminal 20 to TC sensor terminal B.
- The ECM C1 sensor low reference terminal 63 to TC sensor terminal C.
- The ECM C1 sensor 5-volt reference terminal 13 to TC sensor terminal D.
-> If the resistance is over 5 ohms, repair the high resistance in the affected circuit.
9. Remove the TC solenoid from the turbocharger. Connect the ECM and the turbocharger solenoid connectors.
10. Ignition ON, depress the button at the tip of the solenoid slightly. Command the TC Vane Pos. Ctrl. Solenoid ON while observing for the spool valve to open at the slot closest to the button.
-> If the spool valve did not operate, replace the TC solenoid.
11. Inspect the turbocharger for debris, damage, or sticking vanes.
12. If all circuits, the TC vane position solenoid, and the TC vane position sensor tests normal, replace the turbocharger assembly.

Component Testing

Note: You must perform the Circuit/System Testing before proceeding with the Component Testing.

1. Ignition OFF, disconnect the wire harness at the TC solenoid. Test for a resistance of less than 7 ohms across the TC solenoid.
-> If the resistance is more than more than 7 ohms, replace the TC solenoid.
2. Test for infinite resistance between each terminal and the TC solenoid housing.
-> If less than infinite resistance, replace the TC solenoid.
3. Ignition OFF, remove the TC vane position sensor.
4. Connect the harness connector to the TC vane position sensor.
5. Ignition ON, slowly depress the button on the end of the TC vane sensor. Observe the TC Vane Position Sensor parameter for a smooth decreasing percentage from 100-0 percent without any spikes or dropouts.
-> If the TC Vane Position Sensor parameter does not increment smoothly, replace the TC vane position sensor.
pro multis · About Operation CHARM