P0045

DTC P0045

DTC DESCRIPTOR

DTC P0045
Turbocharger Boost Control Solenoid Control Circuit

DIAGNOSTIC FAULT INFORMATION






IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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 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. Refer to Turbocharger Description and Operation.

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
- 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.

SPECIAL TOOLS REQUIRED
J 34730-405 Injector Test Lamp

CIRCUIT/SYSTEM VERIFICATION

IMPORTANT: Always perform the Turbocharger Learn Procedure. Refer to Turbocharger Learn Procedure , then review the DTC information with a scan tool.

1. If DTCs P003A, P0698, P0699, P2564, or P2565 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
2. Using a scan tool and with the engine at idle, observe the TC vane position sensor actual and the desired parameters while slowly increasing the engine speed from idle to 2,500 RPM, and slowly decreasing the engine speed to idle.
- The TC vane position actual parameter should remain near or equal to the desired parameter throughout the engine speed range.

CIRCUIT/SYSTEM TESTING
1. With the ignition OFF for at least 30 seconds, disconnect the TC vane position control solenoid valve.
2. Connect the J 34730-405 between the high control and the low reference circuits.
3. With the engine running, command the TC Pos. Ctrl. solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF.
- If the test lamp does not turn ON and OFF, test the high control and low reference circuits for an open, a short to ground, a short to voltage, or a faulty ECM.
- If the test lamp turns ON and OFF, test the high control and low control circuits for high resistance or for a faulty turbocharger solenoid. Refer to Component Testing in this diagnostic.
4. With the ECM and TC vane position sensor connectors disconnected, measure for a resistance of less than 3 ohms on the sensor signal circuit.
- If the resistance is over 3 ohms, repair the high resistance or poor connection on the signal circuit.
5. Inspect the turbocharger vane control solenoid for debris, damage, or sticking. Refer to Component Testing in this diagnostic.
- If debris, damaged, or a stuck vane position solenoid is verified, replace the turbocharger vane position solenoid.
6. Inspect the turbocharger for debris, damage, or sticking vanes.
- If debris, damaged, or sticking vanes are verified, replace the turbocharger assembly.

COMPONENT TESTING
1. With the turbocharger vane position control solenoid disconnected, measure for a resistance of less than 7 ohms across the solenoid terminals.
- If the resistance is more than more than 7 ohms, replace the turbocharger vane position solenoid.
2. Remove the vane position solenoid from the turbocharger. Reconnect the vane position control solenoid connector with the ignition ON. Depress and hold the cam follower slightly at the tip of the control solenoid valve. With a scan tool, command the control solenoid valve ON while observing the slot closest to the cam follower for the spool valve to move to the open position.
- If the spool valve did not move to the open position and the circuits tested good, replace the turbocharger vane position solenoid.


REPAIR INSTRUCTIONS

IMPORTANT:
- Always perform the Turbocharger Learn Procedure. Refer to Turbocharger Learn Procedure , then review the DTC information with a scan tool.
- Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Turbocharger Vane Position Control Solenoid Valve Replacement
- Turbocharger Replacement
- Control Module References for ECM replacement, setup, and programming.

REPAIR VERIFICATION
With the engine at idle, using a scan tool, observe the TC vane position sensor actual and the desired parameters while slowly increasing the engine speed from idle to 2,500 RPM, and slowly decreasing the engine speed to idle.
- The TC vane position actual parameter should remain near or equal to the desired parameter throughout the engine speed range.