Circuit Description
The position of the turbocharger (TC) vanes is controlled by the engine control module (ECM). The ECM utilizes a TC vane control solenoid valve and a TC vane position sensor to control the TC vanes. When the engine is not under load, the TC vanes are in an open position, or no boost condition. When the engine is under load, the ECM commands the control solenoid valve to close the TC vanes, thus increasing the boost. The ECM will vary the boost dependant upon the load requirements of the engine. The vane control solenoid valve uses 2 circuits, a control circuit and a low reference circuit. The ECM uses a pulse width modulation on the control circuit to open and control the solenoid valve. The ECM provides a ground on the low reference circuit. If the ECM detects any circuit failure, DTC P0045 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0045 Turbocharger Vane Position Control Solenoid Control Circuit
Conditions for Running the DTC
The engine run time is more than 30 seconds.
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 2 seconds. |
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Step | Action | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | |||||||||||
1 | Did you perform the Diagnostic System Check - Engine Controls? | Go to Step 2 | |||||||||
2 | Are DTCs P0652, P0653, P2564, or P2565 also set? | Go to Step 3 | |||||||||
3 |
Does the engine speed change when the valve is commanded ON? | Go to Step 4 | Go to Step 5 | ||||||||
4 |
Did the DTC fail this ignition? | Go to Step 5 | Go to Intermittent Conditions | ||||||||
5 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 6 | ||||||||
6 | Command the TC Vane Pos. Ctrl. Solenoid to ON with a scan tool. Does the test lamp illuminate? | Go to Step 8 | Go to Step 7 | ||||||||
7 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 9 | ||||||||
8 |
Does the test lamp illuminate? | Go to Step 12 | Go to Step 13 | ||||||||
9 | Test the control circuit of the solenoid valve for the following conditions:
Did you find and correct the condition? | Go to Step 20 | Go to Step 16 | ||||||||
10 |
Important: Disconnecting the ECM may eliminate the short during testing. Test the control circuit of the solenoid valve for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 16 | ||||||||
11 | Test the low reference circuit of the solenoid valve for an open, high resistance, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 16 | ||||||||
12 | Test the low reference circuit of the solenoid valve for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 16 | ||||||||
13 |
Did you find and correct the condition? | Go to Step 20 | Go to Step 14 | ||||||||
14 | Test the control circuit and the low reference circuit of the TC vane position control solenoid valve for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 15 | ||||||||
15 | Test for an intermittent and for a poor connection at the vane control solenoid valve. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 17 | ||||||||
16 | Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 19 | ||||||||
17 |
Did you find and correct the condition? | Go to Step 20 | Go to Step 18 | ||||||||
18 | Replace the TC vane control solenoid valve. Refer to Turbocharger Control Solenoid Valve Replacement . Did you complete the replacement? | Go to Step 20 | -- | ||||||||
19 | Replace the ECM. Refer to Engine Control Module Replacement . Did you complete the replacement? | Go to Step 20 | -- | ||||||||
20 |
Did the DTC fail this ignition? | Go to Step 2 | Go to Step 21 | ||||||||
21 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | System OK | |||||||||
